diff env/lib/python3.9/site-packages/cwltool/jshint/jshint.js @ 0:4f3585e2f14b draft default tip

"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/env/lib/python3.9/site-packages/cwltool/jshint/jshint.js	Mon Mar 22 18:12:50 2021 +0000
@@ -0,0 +1,31321 @@
+/*! 2.12.0 */
+var JSHINT;
+if (typeof window === 'undefined') window = {};
+(function () {
+var require;
+require=(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
+var identifierStartTable = [];
+
+for (var i = 0; i < 128; i++) {
+  identifierStartTable[i] =
+    i === 36 ||           // $
+    i >= 65 && i <= 90 || // A-Z
+    i === 95 ||           // _
+    i >= 97 && i <= 122;  // a-z
+}
+
+var identifierPartTable = [];
+
+for (var i = 0; i < 128; i++) {
+  identifierPartTable[i] =
+    identifierStartTable[i] || // $, _, A-Z, a-z
+    i >= 48 && i <= 57;        // 0-9
+}
+
+module.exports = {
+  asciiIdentifierStartTable: identifierStartTable,
+  asciiIdentifierPartTable: identifierPartTable
+};
+
+},{}],2:[function(require,module,exports){
+module.exports = 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+},{}],3:[function(require,module,exports){
+var str = 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+var arr = str.split(',').map(function(code) {
+  return parseInt(code, 10);
+});
+module.exports = arr;
+},{}],4:[function(require,module,exports){
+var str = 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+var arr = str.split(',').map(function(code) {
+  return parseInt(code, 10);
+});
+module.exports = arr;
+},{}],5:[function(require,module,exports){
+// http://wiki.commonjs.org/wiki/Unit_Testing/1.0
+//
+// THIS IS NOT TESTED NOR LIKELY TO WORK OUTSIDE V8!
+//
+// Originally from narwhal.js (http://narwhaljs.org)
+// Copyright (c) 2009 Thomas Robinson <280north.com>
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the 'Software'), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+// when used in node, this will actually load the util module we depend on
+// versus loading the builtin util module as happens otherwise
+// this is a bug in node module loading as far as I am concerned
+var util = require('util/');
+
+var pSlice = Array.prototype.slice;
+var hasOwn = Object.prototype.hasOwnProperty;
+
+// 1. The assert module provides functions that throw
+// AssertionError's when particular conditions are not met. The
+// assert module must conform to the following interface.
+
+var assert = module.exports = ok;
+
+// 2. The AssertionError is defined in assert.
+// new assert.AssertionError({ message: message,
+//                             actual: actual,
+//                             expected: expected })
+
+assert.AssertionError = function AssertionError(options) {
+  this.name = 'AssertionError';
+  this.actual = options.actual;
+  this.expected = options.expected;
+  this.operator = options.operator;
+  if (options.message) {
+    this.message = options.message;
+    this.generatedMessage = false;
+  } else {
+    this.message = getMessage(this);
+    this.generatedMessage = true;
+  }
+  var stackStartFunction = options.stackStartFunction || fail;
+
+  if (Error.captureStackTrace) {
+    Error.captureStackTrace(this, stackStartFunction);
+  }
+  else {
+    // non v8 browsers so we can have a stacktrace
+    var err = new Error();
+    if (err.stack) {
+      var out = err.stack;
+
+      // try to strip useless frames
+      var fn_name = stackStartFunction.name;
+      var idx = out.indexOf('\n' + fn_name);
+      if (idx >= 0) {
+        // once we have located the function frame
+        // we need to strip out everything before it (and its line)
+        var next_line = out.indexOf('\n', idx + 1);
+        out = out.substring(next_line + 1);
+      }
+
+      this.stack = out;
+    }
+  }
+};
+
+// assert.AssertionError instanceof Error
+util.inherits(assert.AssertionError, Error);
+
+function replacer(key, value) {
+  if (util.isUndefined(value)) {
+    return '' + value;
+  }
+  if (util.isNumber(value) && !isFinite(value)) {
+    return value.toString();
+  }
+  if (util.isFunction(value) || util.isRegExp(value)) {
+    return value.toString();
+  }
+  return value;
+}
+
+function truncate(s, n) {
+  if (util.isString(s)) {
+    return s.length < n ? s : s.slice(0, n);
+  } else {
+    return s;
+  }
+}
+
+function getMessage(self) {
+  return truncate(JSON.stringify(self.actual, replacer), 128) + ' ' +
+         self.operator + ' ' +
+         truncate(JSON.stringify(self.expected, replacer), 128);
+}
+
+// At present only the three keys mentioned above are used and
+// understood by the spec. Implementations or sub modules can pass
+// other keys to the AssertionError's constructor - they will be
+// ignored.
+
+// 3. All of the following functions must throw an AssertionError
+// when a corresponding condition is not met, with a message that
+// may be undefined if not provided.  All assertion methods provide
+// both the actual and expected values to the assertion error for
+// display purposes.
+
+function fail(actual, expected, message, operator, stackStartFunction) {
+  throw new assert.AssertionError({
+    message: message,
+    actual: actual,
+    expected: expected,
+    operator: operator,
+    stackStartFunction: stackStartFunction
+  });
+}
+
+// EXTENSION! allows for well behaved errors defined elsewhere.
+assert.fail = fail;
+
+// 4. Pure assertion tests whether a value is truthy, as determined
+// by !!guard.
+// assert.ok(guard, message_opt);
+// This statement is equivalent to assert.equal(true, !!guard,
+// message_opt);. To test strictly for the value true, use
+// assert.strictEqual(true, guard, message_opt);.
+
+function ok(value, message) {
+  if (!value) fail(value, true, message, '==', assert.ok);
+}
+assert.ok = ok;
+
+// 5. The equality assertion tests shallow, coercive equality with
+// ==.
+// assert.equal(actual, expected, message_opt);
+
+assert.equal = function equal(actual, expected, message) {
+  if (actual != expected) fail(actual, expected, message, '==', assert.equal);
+};
+
+// 6. The non-equality assertion tests for whether two objects are not equal
+// with != assert.notEqual(actual, expected, message_opt);
+
+assert.notEqual = function notEqual(actual, expected, message) {
+  if (actual == expected) {
+    fail(actual, expected, message, '!=', assert.notEqual);
+  }
+};
+
+// 7. The equivalence assertion tests a deep equality relation.
+// assert.deepEqual(actual, expected, message_opt);
+
+assert.deepEqual = function deepEqual(actual, expected, message) {
+  if (!_deepEqual(actual, expected)) {
+    fail(actual, expected, message, 'deepEqual', assert.deepEqual);
+  }
+};
+
+function _deepEqual(actual, expected) {
+  // 7.1. All identical values are equivalent, as determined by ===.
+  if (actual === expected) {
+    return true;
+
+  } else if (util.isBuffer(actual) && util.isBuffer(expected)) {
+    if (actual.length != expected.length) return false;
+
+    for (var i = 0; i < actual.length; i++) {
+      if (actual[i] !== expected[i]) return false;
+    }
+
+    return true;
+
+  // 7.2. If the expected value is a Date object, the actual value is
+  // equivalent if it is also a Date object that refers to the same time.
+  } else if (util.isDate(actual) && util.isDate(expected)) {
+    return actual.getTime() === expected.getTime();
+
+  // 7.3 If the expected value is a RegExp object, the actual value is
+  // equivalent if it is also a RegExp object with the same source and
+  // properties (`global`, `multiline`, `lastIndex`, `ignoreCase`).
+  } else if (util.isRegExp(actual) && util.isRegExp(expected)) {
+    return actual.source === expected.source &&
+           actual.global === expected.global &&
+           actual.multiline === expected.multiline &&
+           actual.lastIndex === expected.lastIndex &&
+           actual.ignoreCase === expected.ignoreCase;
+
+  // 7.4. Other pairs that do not both pass typeof value == 'object',
+  // equivalence is determined by ==.
+  } else if (!util.isObject(actual) && !util.isObject(expected)) {
+    return actual == expected;
+
+  // 7.5 For all other Object pairs, including Array objects, equivalence is
+  // determined by having the same number of owned properties (as verified
+  // with Object.prototype.hasOwnProperty.call), the same set of keys
+  // (although not necessarily the same order), equivalent values for every
+  // corresponding key, and an identical 'prototype' property. Note: this
+  // accounts for both named and indexed properties on Arrays.
+  } else {
+    return objEquiv(actual, expected);
+  }
+}
+
+function isArguments(object) {
+  return Object.prototype.toString.call(object) == '[object Arguments]';
+}
+
+function objEquiv(a, b) {
+  if (util.isNullOrUndefined(a) || util.isNullOrUndefined(b))
+    return false;
+  // an identical 'prototype' property.
+  if (a.prototype !== b.prototype) return false;
+  // if one is a primitive, the other must be same
+  if (util.isPrimitive(a) || util.isPrimitive(b)) {
+    return a === b;
+  }
+  var aIsArgs = isArguments(a),
+      bIsArgs = isArguments(b);
+  if ((aIsArgs && !bIsArgs) || (!aIsArgs && bIsArgs))
+    return false;
+  if (aIsArgs) {
+    a = pSlice.call(a);
+    b = pSlice.call(b);
+    return _deepEqual(a, b);
+  }
+  var ka = objectKeys(a),
+      kb = objectKeys(b),
+      key, i;
+  // having the same number of owned properties (keys incorporates
+  // hasOwnProperty)
+  if (ka.length != kb.length)
+    return false;
+  //the same set of keys (although not necessarily the same order),
+  ka.sort();
+  kb.sort();
+  //~~~cheap key test
+  for (i = ka.length - 1; i >= 0; i--) {
+    if (ka[i] != kb[i])
+      return false;
+  }
+  //equivalent values for every corresponding key, and
+  //~~~possibly expensive deep test
+  for (i = ka.length - 1; i >= 0; i--) {
+    key = ka[i];
+    if (!_deepEqual(a[key], b[key])) return false;
+  }
+  return true;
+}
+
+// 8. The non-equivalence assertion tests for any deep inequality.
+// assert.notDeepEqual(actual, expected, message_opt);
+
+assert.notDeepEqual = function notDeepEqual(actual, expected, message) {
+  if (_deepEqual(actual, expected)) {
+    fail(actual, expected, message, 'notDeepEqual', assert.notDeepEqual);
+  }
+};
+
+// 9. The strict equality assertion tests strict equality, as determined by ===.
+// assert.strictEqual(actual, expected, message_opt);
+
+assert.strictEqual = function strictEqual(actual, expected, message) {
+  if (actual !== expected) {
+    fail(actual, expected, message, '===', assert.strictEqual);
+  }
+};
+
+// 10. The strict non-equality assertion tests for strict inequality, as
+// determined by !==.  assert.notStrictEqual(actual, expected, message_opt);
+
+assert.notStrictEqual = function notStrictEqual(actual, expected, message) {
+  if (actual === expected) {
+    fail(actual, expected, message, '!==', assert.notStrictEqual);
+  }
+};
+
+function expectedException(actual, expected) {
+  if (!actual || !expected) {
+    return false;
+  }
+
+  if (Object.prototype.toString.call(expected) == '[object RegExp]') {
+    return expected.test(actual);
+  } else if (actual instanceof expected) {
+    return true;
+  } else if (expected.call({}, actual) === true) {
+    return true;
+  }
+
+  return false;
+}
+
+function _throws(shouldThrow, block, expected, message) {
+  var actual;
+
+  if (util.isString(expected)) {
+    message = expected;
+    expected = null;
+  }
+
+  try {
+    block();
+  } catch (e) {
+    actual = e;
+  }
+
+  message = (expected && expected.name ? ' (' + expected.name + ').' : '.') +
+            (message ? ' ' + message : '.');
+
+  if (shouldThrow && !actual) {
+    fail(actual, expected, 'Missing expected exception' + message);
+  }
+
+  if (!shouldThrow && expectedException(actual, expected)) {
+    fail(actual, expected, 'Got unwanted exception' + message);
+  }
+
+  if ((shouldThrow && actual && expected &&
+      !expectedException(actual, expected)) || (!shouldThrow && actual)) {
+    throw actual;
+  }
+}
+
+// 11. Expected to throw an error:
+// assert.throws(block, Error_opt, message_opt);
+
+assert.throws = function(block, /*optional*/error, /*optional*/message) {
+  _throws.apply(this, [true].concat(pSlice.call(arguments)));
+};
+
+// EXTENSION! This is annoying to write outside this module.
+assert.doesNotThrow = function(block, /*optional*/message) {
+  _throws.apply(this, [false].concat(pSlice.call(arguments)));
+};
+
+assert.ifError = function(err) { if (err) {throw err;}};
+
+var objectKeys = Object.keys || function (obj) {
+  var keys = [];
+  for (var key in obj) {
+    if (hasOwn.call(obj, key)) keys.push(key);
+  }
+  return keys;
+};
+
+},{"util/":8}],6:[function(require,module,exports){
+if (typeof Object.create === 'function') {
+  // implementation from standard node.js 'util' module
+  module.exports = function inherits(ctor, superCtor) {
+    ctor.super_ = superCtor
+    ctor.prototype = Object.create(superCtor.prototype, {
+      constructor: {
+        value: ctor,
+        enumerable: false,
+        writable: true,
+        configurable: true
+      }
+    });
+  };
+} else {
+  // old school shim for old browsers
+  module.exports = function inherits(ctor, superCtor) {
+    ctor.super_ = superCtor
+    var TempCtor = function () {}
+    TempCtor.prototype = superCtor.prototype
+    ctor.prototype = new TempCtor()
+    ctor.prototype.constructor = ctor
+  }
+}
+
+},{}],7:[function(require,module,exports){
+module.exports = function isBuffer(arg) {
+  return arg && typeof arg === 'object'
+    && typeof arg.copy === 'function'
+    && typeof arg.fill === 'function'
+    && typeof arg.readUInt8 === 'function';
+}
+},{}],8:[function(require,module,exports){
+(function (process,global){
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+var formatRegExp = /%[sdj%]/g;
+exports.format = function(f) {
+  if (!isString(f)) {
+    var objects = [];
+    for (var i = 0; i < arguments.length; i++) {
+      objects.push(inspect(arguments[i]));
+    }
+    return objects.join(' ');
+  }
+
+  var i = 1;
+  var args = arguments;
+  var len = args.length;
+  var str = String(f).replace(formatRegExp, function(x) {
+    if (x === '%%') return '%';
+    if (i >= len) return x;
+    switch (x) {
+      case '%s': return String(args[i++]);
+      case '%d': return Number(args[i++]);
+      case '%j':
+        try {
+          return JSON.stringify(args[i++]);
+        } catch (_) {
+          return '[Circular]';
+        }
+      default:
+        return x;
+    }
+  });
+  for (var x = args[i]; i < len; x = args[++i]) {
+    if (isNull(x) || !isObject(x)) {
+      str += ' ' + x;
+    } else {
+      str += ' ' + inspect(x);
+    }
+  }
+  return str;
+};
+
+
+// Mark that a method should not be used.
+// Returns a modified function which warns once by default.
+// If --no-deprecation is set, then it is a no-op.
+exports.deprecate = function(fn, msg) {
+  // Allow for deprecating things in the process of starting up.
+  if (isUndefined(global.process)) {
+    return function() {
+      return exports.deprecate(fn, msg).apply(this, arguments);
+    };
+  }
+
+  if (process.noDeprecation === true) {
+    return fn;
+  }
+
+  var warned = false;
+  function deprecated() {
+    if (!warned) {
+      if (process.throwDeprecation) {
+        throw new Error(msg);
+      } else if (process.traceDeprecation) {
+        console.trace(msg);
+      } else {
+        console.error(msg);
+      }
+      warned = true;
+    }
+    return fn.apply(this, arguments);
+  }
+
+  return deprecated;
+};
+
+
+var debugs = {};
+var debugEnviron;
+exports.debuglog = function(set) {
+  if (isUndefined(debugEnviron))
+    debugEnviron = process.env.NODE_DEBUG || '';
+  set = set.toUpperCase();
+  if (!debugs[set]) {
+    if (new RegExp('\\b' + set + '\\b', 'i').test(debugEnviron)) {
+      var pid = process.pid;
+      debugs[set] = function() {
+        var msg = exports.format.apply(exports, arguments);
+        console.error('%s %d: %s', set, pid, msg);
+      };
+    } else {
+      debugs[set] = function() {};
+    }
+  }
+  return debugs[set];
+};
+
+
+/**
+ * Echos the value of a value. Trys to print the value out
+ * in the best way possible given the different types.
+ *
+ * @param {Object} obj The object to print out.
+ * @param {Object} opts Optional options object that alters the output.
+ */
+/* legacy: obj, showHidden, depth, colors*/
+function inspect(obj, opts) {
+  // default options
+  var ctx = {
+    seen: [],
+    stylize: stylizeNoColor
+  };
+  // legacy...
+  if (arguments.length >= 3) ctx.depth = arguments[2];
+  if (arguments.length >= 4) ctx.colors = arguments[3];
+  if (isBoolean(opts)) {
+    // legacy...
+    ctx.showHidden = opts;
+  } else if (opts) {
+    // got an "options" object
+    exports._extend(ctx, opts);
+  }
+  // set default options
+  if (isUndefined(ctx.showHidden)) ctx.showHidden = false;
+  if (isUndefined(ctx.depth)) ctx.depth = 2;
+  if (isUndefined(ctx.colors)) ctx.colors = false;
+  if (isUndefined(ctx.customInspect)) ctx.customInspect = true;
+  if (ctx.colors) ctx.stylize = stylizeWithColor;
+  return formatValue(ctx, obj, ctx.depth);
+}
+exports.inspect = inspect;
+
+
+// http://en.wikipedia.org/wiki/ANSI_escape_code#graphics
+inspect.colors = {
+  'bold' : [1, 22],
+  'italic' : [3, 23],
+  'underline' : [4, 24],
+  'inverse' : [7, 27],
+  'white' : [37, 39],
+  'grey' : [90, 39],
+  'black' : [30, 39],
+  'blue' : [34, 39],
+  'cyan' : [36, 39],
+  'green' : [32, 39],
+  'magenta' : [35, 39],
+  'red' : [31, 39],
+  'yellow' : [33, 39]
+};
+
+// Don't use 'blue' not visible on cmd.exe
+inspect.styles = {
+  'special': 'cyan',
+  'number': 'yellow',
+  'boolean': 'yellow',
+  'undefined': 'grey',
+  'null': 'bold',
+  'string': 'green',
+  'date': 'magenta',
+  // "name": intentionally not styling
+  'regexp': 'red'
+};
+
+
+function stylizeWithColor(str, styleType) {
+  var style = inspect.styles[styleType];
+
+  if (style) {
+    return '\u001b[' + inspect.colors[style][0] + 'm' + str +
+           '\u001b[' + inspect.colors[style][1] + 'm';
+  } else {
+    return str;
+  }
+}
+
+
+function stylizeNoColor(str, styleType) {
+  return str;
+}
+
+
+function arrayToHash(array) {
+  var hash = {};
+
+  array.forEach(function(val, idx) {
+    hash[val] = true;
+  });
+
+  return hash;
+}
+
+
+function formatValue(ctx, value, recurseTimes) {
+  // Provide a hook for user-specified inspect functions.
+  // Check that value is an object with an inspect function on it
+  if (ctx.customInspect &&
+      value &&
+      isFunction(value.inspect) &&
+      // Filter out the util module, it's inspect function is special
+      value.inspect !== exports.inspect &&
+      // Also filter out any prototype objects using the circular check.
+      !(value.constructor && value.constructor.prototype === value)) {
+    var ret = value.inspect(recurseTimes, ctx);
+    if (!isString(ret)) {
+      ret = formatValue(ctx, ret, recurseTimes);
+    }
+    return ret;
+  }
+
+  // Primitive types cannot have properties
+  var primitive = formatPrimitive(ctx, value);
+  if (primitive) {
+    return primitive;
+  }
+
+  // Look up the keys of the object.
+  var keys = Object.keys(value);
+  var visibleKeys = arrayToHash(keys);
+
+  if (ctx.showHidden) {
+    keys = Object.getOwnPropertyNames(value);
+  }
+
+  // IE doesn't make error fields non-enumerable
+  // http://msdn.microsoft.com/en-us/library/ie/dww52sbt(v=vs.94).aspx
+  if (isError(value)
+      && (keys.indexOf('message') >= 0 || keys.indexOf('description') >= 0)) {
+    return formatError(value);
+  }
+
+  // Some type of object without properties can be shortcutted.
+  if (keys.length === 0) {
+    if (isFunction(value)) {
+      var name = value.name ? ': ' + value.name : '';
+      return ctx.stylize('[Function' + name + ']', 'special');
+    }
+    if (isRegExp(value)) {
+      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
+    }
+    if (isDate(value)) {
+      return ctx.stylize(Date.prototype.toString.call(value), 'date');
+    }
+    if (isError(value)) {
+      return formatError(value);
+    }
+  }
+
+  var base = '', array = false, braces = ['{', '}'];
+
+  // Make Array say that they are Array
+  if (isArray(value)) {
+    array = true;
+    braces = ['[', ']'];
+  }
+
+  // Make functions say that they are functions
+  if (isFunction(value)) {
+    var n = value.name ? ': ' + value.name : '';
+    base = ' [Function' + n + ']';
+  }
+
+  // Make RegExps say that they are RegExps
+  if (isRegExp(value)) {
+    base = ' ' + RegExp.prototype.toString.call(value);
+  }
+
+  // Make dates with properties first say the date
+  if (isDate(value)) {
+    base = ' ' + Date.prototype.toUTCString.call(value);
+  }
+
+  // Make error with message first say the error
+  if (isError(value)) {
+    base = ' ' + formatError(value);
+  }
+
+  if (keys.length === 0 && (!array || value.length == 0)) {
+    return braces[0] + base + braces[1];
+  }
+
+  if (recurseTimes < 0) {
+    if (isRegExp(value)) {
+      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
+    } else {
+      return ctx.stylize('[Object]', 'special');
+    }
+  }
+
+  ctx.seen.push(value);
+
+  var output;
+  if (array) {
+    output = formatArray(ctx, value, recurseTimes, visibleKeys, keys);
+  } else {
+    output = keys.map(function(key) {
+      return formatProperty(ctx, value, recurseTimes, visibleKeys, key, array);
+    });
+  }
+
+  ctx.seen.pop();
+
+  return reduceToSingleString(output, base, braces);
+}
+
+
+function formatPrimitive(ctx, value) {
+  if (isUndefined(value))
+    return ctx.stylize('undefined', 'undefined');
+  if (isString(value)) {
+    var simple = '\'' + JSON.stringify(value).replace(/^"|"$/g, '')
+                                             .replace(/'/g, "\\'")
+                                             .replace(/\\"/g, '"') + '\'';
+    return ctx.stylize(simple, 'string');
+  }
+  if (isNumber(value))
+    return ctx.stylize('' + value, 'number');
+  if (isBoolean(value))
+    return ctx.stylize('' + value, 'boolean');
+  // For some reason typeof null is "object", so special case here.
+  if (isNull(value))
+    return ctx.stylize('null', 'null');
+}
+
+
+function formatError(value) {
+  return '[' + Error.prototype.toString.call(value) + ']';
+}
+
+
+function formatArray(ctx, value, recurseTimes, visibleKeys, keys) {
+  var output = [];
+  for (var i = 0, l = value.length; i < l; ++i) {
+    if (hasOwnProperty(value, String(i))) {
+      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
+          String(i), true));
+    } else {
+      output.push('');
+    }
+  }
+  keys.forEach(function(key) {
+    if (!key.match(/^\d+$/)) {
+      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
+          key, true));
+    }
+  });
+  return output;
+}
+
+
+function formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) {
+  var name, str, desc;
+  desc = Object.getOwnPropertyDescriptor(value, key) || { value: value[key] };
+  if (desc.get) {
+    if (desc.set) {
+      str = ctx.stylize('[Getter/Setter]', 'special');
+    } else {
+      str = ctx.stylize('[Getter]', 'special');
+    }
+  } else {
+    if (desc.set) {
+      str = ctx.stylize('[Setter]', 'special');
+    }
+  }
+  if (!hasOwnProperty(visibleKeys, key)) {
+    name = '[' + key + ']';
+  }
+  if (!str) {
+    if (ctx.seen.indexOf(desc.value) < 0) {
+      if (isNull(recurseTimes)) {
+        str = formatValue(ctx, desc.value, null);
+      } else {
+        str = formatValue(ctx, desc.value, recurseTimes - 1);
+      }
+      if (str.indexOf('\n') > -1) {
+        if (array) {
+          str = str.split('\n').map(function(line) {
+            return '  ' + line;
+          }).join('\n').substr(2);
+        } else {
+          str = '\n' + str.split('\n').map(function(line) {
+            return '   ' + line;
+          }).join('\n');
+        }
+      }
+    } else {
+      str = ctx.stylize('[Circular]', 'special');
+    }
+  }
+  if (isUndefined(name)) {
+    if (array && key.match(/^\d+$/)) {
+      return str;
+    }
+    name = JSON.stringify('' + key);
+    if (name.match(/^"([a-zA-Z_][a-zA-Z_0-9]*)"$/)) {
+      name = name.substr(1, name.length - 2);
+      name = ctx.stylize(name, 'name');
+    } else {
+      name = name.replace(/'/g, "\\'")
+                 .replace(/\\"/g, '"')
+                 .replace(/(^"|"$)/g, "'");
+      name = ctx.stylize(name, 'string');
+    }
+  }
+
+  return name + ': ' + str;
+}
+
+
+function reduceToSingleString(output, base, braces) {
+  var numLinesEst = 0;
+  var length = output.reduce(function(prev, cur) {
+    numLinesEst++;
+    if (cur.indexOf('\n') >= 0) numLinesEst++;
+    return prev + cur.replace(/\u001b\[\d\d?m/g, '').length + 1;
+  }, 0);
+
+  if (length > 60) {
+    return braces[0] +
+           (base === '' ? '' : base + '\n ') +
+           ' ' +
+           output.join(',\n  ') +
+           ' ' +
+           braces[1];
+  }
+
+  return braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1];
+}
+
+
+// NOTE: These type checking functions intentionally don't use `instanceof`
+// because it is fragile and can be easily faked with `Object.create()`.
+function isArray(ar) {
+  return Array.isArray(ar);
+}
+exports.isArray = isArray;
+
+function isBoolean(arg) {
+  return typeof arg === 'boolean';
+}
+exports.isBoolean = isBoolean;
+
+function isNull(arg) {
+  return arg === null;
+}
+exports.isNull = isNull;
+
+function isNullOrUndefined(arg) {
+  return arg == null;
+}
+exports.isNullOrUndefined = isNullOrUndefined;
+
+function isNumber(arg) {
+  return typeof arg === 'number';
+}
+exports.isNumber = isNumber;
+
+function isString(arg) {
+  return typeof arg === 'string';
+}
+exports.isString = isString;
+
+function isSymbol(arg) {
+  return typeof arg === 'symbol';
+}
+exports.isSymbol = isSymbol;
+
+function isUndefined(arg) {
+  return arg === void 0;
+}
+exports.isUndefined = isUndefined;
+
+function isRegExp(re) {
+  return isObject(re) && objectToString(re) === '[object RegExp]';
+}
+exports.isRegExp = isRegExp;
+
+function isObject(arg) {
+  return typeof arg === 'object' && arg !== null;
+}
+exports.isObject = isObject;
+
+function isDate(d) {
+  return isObject(d) && objectToString(d) === '[object Date]';
+}
+exports.isDate = isDate;
+
+function isError(e) {
+  return isObject(e) &&
+      (objectToString(e) === '[object Error]' || e instanceof Error);
+}
+exports.isError = isError;
+
+function isFunction(arg) {
+  return typeof arg === 'function';
+}
+exports.isFunction = isFunction;
+
+function isPrimitive(arg) {
+  return arg === null ||
+         typeof arg === 'boolean' ||
+         typeof arg === 'number' ||
+         typeof arg === 'string' ||
+         typeof arg === 'symbol' ||  // ES6 symbol
+         typeof arg === 'undefined';
+}
+exports.isPrimitive = isPrimitive;
+
+exports.isBuffer = require('./support/isBuffer');
+
+function objectToString(o) {
+  return Object.prototype.toString.call(o);
+}
+
+
+function pad(n) {
+  return n < 10 ? '0' + n.toString(10) : n.toString(10);
+}
+
+
+var months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep',
+              'Oct', 'Nov', 'Dec'];
+
+// 26 Feb 16:19:34
+function timestamp() {
+  var d = new Date();
+  var time = [pad(d.getHours()),
+              pad(d.getMinutes()),
+              pad(d.getSeconds())].join(':');
+  return [d.getDate(), months[d.getMonth()], time].join(' ');
+}
+
+
+// log is just a thin wrapper to console.log that prepends a timestamp
+exports.log = function() {
+  console.log('%s - %s', timestamp(), exports.format.apply(exports, arguments));
+};
+
+
+/**
+ * Inherit the prototype methods from one constructor into another.
+ *
+ * The Function.prototype.inherits from lang.js rewritten as a standalone
+ * function (not on Function.prototype). NOTE: If this file is to be loaded
+ * during bootstrapping this function needs to be rewritten using some native
+ * functions as prototype setup using normal JavaScript does not work as
+ * expected during bootstrapping (see mirror.js in r114903).
+ *
+ * @param {function} ctor Constructor function which needs to inherit the
+ *     prototype.
+ * @param {function} superCtor Constructor function to inherit prototype from.
+ */
+exports.inherits = require('inherits');
+
+exports._extend = function(origin, add) {
+  // Don't do anything if add isn't an object
+  if (!add || !isObject(add)) return origin;
+
+  var keys = Object.keys(add);
+  var i = keys.length;
+  while (i--) {
+    origin[keys[i]] = add[keys[i]];
+  }
+  return origin;
+};
+
+function hasOwnProperty(obj, prop) {
+  return Object.prototype.hasOwnProperty.call(obj, prop);
+}
+
+}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
+},{"./support/isBuffer":7,"_process":11,"inherits":6}],9:[function(require,module,exports){
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+function EventEmitter() {
+  this._events = this._events || {};
+  this._maxListeners = this._maxListeners || undefined;
+}
+module.exports = EventEmitter;
+
+// Backwards-compat with node 0.10.x
+EventEmitter.EventEmitter = EventEmitter;
+
+EventEmitter.prototype._events = undefined;
+EventEmitter.prototype._maxListeners = undefined;
+
+// By default EventEmitters will print a warning if more than 10 listeners are
+// added to it. This is a useful default which helps finding memory leaks.
+EventEmitter.defaultMaxListeners = 10;
+
+// Obviously not all Emitters should be limited to 10. This function allows
+// that to be increased. Set to zero for unlimited.
+EventEmitter.prototype.setMaxListeners = function(n) {
+  if (!isNumber(n) || n < 0 || isNaN(n))
+    throw TypeError('n must be a positive number');
+  this._maxListeners = n;
+  return this;
+};
+
+EventEmitter.prototype.emit = function(type) {
+  var er, handler, len, args, i, listeners;
+
+  if (!this._events)
+    this._events = {};
+
+  // If there is no 'error' event listener then throw.
+  if (type === 'error') {
+    if (!this._events.error ||
+        (isObject(this._events.error) && !this._events.error.length)) {
+      er = arguments[1];
+      if (er instanceof Error) {
+        throw er; // Unhandled 'error' event
+      }
+      throw TypeError('Uncaught, unspecified "error" event.');
+    }
+  }
+
+  handler = this._events[type];
+
+  if (isUndefined(handler))
+    return false;
+
+  if (isFunction(handler)) {
+    switch (arguments.length) {
+      // fast cases
+      case 1:
+        handler.call(this);
+        break;
+      case 2:
+        handler.call(this, arguments[1]);
+        break;
+      case 3:
+        handler.call(this, arguments[1], arguments[2]);
+        break;
+      // slower
+      default:
+        len = arguments.length;
+        args = new Array(len - 1);
+        for (i = 1; i < len; i++)
+          args[i - 1] = arguments[i];
+        handler.apply(this, args);
+    }
+  } else if (isObject(handler)) {
+    len = arguments.length;
+    args = new Array(len - 1);
+    for (i = 1; i < len; i++)
+      args[i - 1] = arguments[i];
+
+    listeners = handler.slice();
+    len = listeners.length;
+    for (i = 0; i < len; i++)
+      listeners[i].apply(this, args);
+  }
+
+  return true;
+};
+
+EventEmitter.prototype.addListener = function(type, listener) {
+  var m;
+
+  if (!isFunction(listener))
+    throw TypeError('listener must be a function');
+
+  if (!this._events)
+    this._events = {};
+
+  // To avoid recursion in the case that type === "newListener"! Before
+  // adding it to the listeners, first emit "newListener".
+  if (this._events.newListener)
+    this.emit('newListener', type,
+              isFunction(listener.listener) ?
+              listener.listener : listener);
+
+  if (!this._events[type])
+    // Optimize the case of one listener. Don't need the extra array object.
+    this._events[type] = listener;
+  else if (isObject(this._events[type]))
+    // If we've already got an array, just append.
+    this._events[type].push(listener);
+  else
+    // Adding the second element, need to change to array.
+    this._events[type] = [this._events[type], listener];
+
+  // Check for listener leak
+  if (isObject(this._events[type]) && !this._events[type].warned) {
+    var m;
+    if (!isUndefined(this._maxListeners)) {
+      m = this._maxListeners;
+    } else {
+      m = EventEmitter.defaultMaxListeners;
+    }
+
+    if (m && m > 0 && this._events[type].length > m) {
+      this._events[type].warned = true;
+      console.error('(node) warning: possible EventEmitter memory ' +
+                    'leak detected. %d listeners added. ' +
+                    'Use emitter.setMaxListeners() to increase limit.',
+                    this._events[type].length);
+      if (typeof console.trace === 'function') {
+        // not supported in IE 10
+        console.trace();
+      }
+    }
+  }
+
+  return this;
+};
+
+EventEmitter.prototype.on = EventEmitter.prototype.addListener;
+
+EventEmitter.prototype.once = function(type, listener) {
+  if (!isFunction(listener))
+    throw TypeError('listener must be a function');
+
+  var fired = false;
+
+  function g() {
+    this.removeListener(type, g);
+
+    if (!fired) {
+      fired = true;
+      listener.apply(this, arguments);
+    }
+  }
+
+  g.listener = listener;
+  this.on(type, g);
+
+  return this;
+};
+
+// emits a 'removeListener' event iff the listener was removed
+EventEmitter.prototype.removeListener = function(type, listener) {
+  var list, position, length, i;
+
+  if (!isFunction(listener))
+    throw TypeError('listener must be a function');
+
+  if (!this._events || !this._events[type])
+    return this;
+
+  list = this._events[type];
+  length = list.length;
+  position = -1;
+
+  if (list === listener ||
+      (isFunction(list.listener) && list.listener === listener)) {
+    delete this._events[type];
+    if (this._events.removeListener)
+      this.emit('removeListener', type, listener);
+
+  } else if (isObject(list)) {
+    for (i = length; i-- > 0;) {
+      if (list[i] === listener ||
+          (list[i].listener && list[i].listener === listener)) {
+        position = i;
+        break;
+      }
+    }
+
+    if (position < 0)
+      return this;
+
+    if (list.length === 1) {
+      list.length = 0;
+      delete this._events[type];
+    } else {
+      list.splice(position, 1);
+    }
+
+    if (this._events.removeListener)
+      this.emit('removeListener', type, listener);
+  }
+
+  return this;
+};
+
+EventEmitter.prototype.removeAllListeners = function(type) {
+  var key, listeners;
+
+  if (!this._events)
+    return this;
+
+  // not listening for removeListener, no need to emit
+  if (!this._events.removeListener) {
+    if (arguments.length === 0)
+      this._events = {};
+    else if (this._events[type])
+      delete this._events[type];
+    return this;
+  }
+
+  // emit removeListener for all listeners on all events
+  if (arguments.length === 0) {
+    for (key in this._events) {
+      if (key === 'removeListener') continue;
+      this.removeAllListeners(key);
+    }
+    this.removeAllListeners('removeListener');
+    this._events = {};
+    return this;
+  }
+
+  listeners = this._events[type];
+
+  if (isFunction(listeners)) {
+    this.removeListener(type, listeners);
+  } else {
+    // LIFO order
+    while (listeners.length)
+      this.removeListener(type, listeners[listeners.length - 1]);
+  }
+  delete this._events[type];
+
+  return this;
+};
+
+EventEmitter.prototype.listeners = function(type) {
+  var ret;
+  if (!this._events || !this._events[type])
+    ret = [];
+  else if (isFunction(this._events[type]))
+    ret = [this._events[type]];
+  else
+    ret = this._events[type].slice();
+  return ret;
+};
+
+EventEmitter.listenerCount = function(emitter, type) {
+  var ret;
+  if (!emitter._events || !emitter._events[type])
+    ret = 0;
+  else if (isFunction(emitter._events[type]))
+    ret = 1;
+  else
+    ret = emitter._events[type].length;
+  return ret;
+};
+
+function isFunction(arg) {
+  return typeof arg === 'function';
+}
+
+function isNumber(arg) {
+  return typeof arg === 'number';
+}
+
+function isObject(arg) {
+  return typeof arg === 'object' && arg !== null;
+}
+
+function isUndefined(arg) {
+  return arg === void 0;
+}
+
+},{}],10:[function(require,module,exports){
+arguments[4][6][0].apply(exports,arguments)
+},{"dup":6}],11:[function(require,module,exports){
+// shim for using process in browser
+
+var process = module.exports = {};
+var queue = [];
+var draining = false;
+
+function drainQueue() {
+    if (draining) {
+        return;
+    }
+    draining = true;
+    var currentQueue;
+    var len = queue.length;
+    while(len) {
+        currentQueue = queue;
+        queue = [];
+        var i = -1;
+        while (++i < len) {
+            currentQueue[i]();
+        }
+        len = queue.length;
+    }
+    draining = false;
+}
+process.nextTick = function (fun) {
+    queue.push(fun);
+    if (!draining) {
+        setTimeout(drainQueue, 0);
+    }
+};
+
+process.title = 'browser';
+process.browser = true;
+process.env = {};
+process.argv = [];
+process.version = ''; // empty string to avoid regexp issues
+process.versions = {};
+
+function noop() {}
+
+process.on = noop;
+process.addListener = noop;
+process.once = noop;
+process.off = noop;
+process.removeListener = noop;
+process.removeAllListeners = noop;
+process.emit = noop;
+
+process.binding = function (name) {
+    throw new Error('process.binding is not supported');
+};
+
+// TODO(shtylman)
+process.cwd = function () { return '/' };
+process.chdir = function (dir) {
+    throw new Error('process.chdir is not supported');
+};
+process.umask = function() { return 0; };
+
+},{}],12:[function(require,module,exports){
+arguments[4][7][0].apply(exports,arguments)
+},{"dup":7}],13:[function(require,module,exports){
+arguments[4][8][0].apply(exports,arguments)
+},{"./support/isBuffer":12,"_process":11,"dup":8,"inherits":10}],14:[function(require,module,exports){
+(function (global){
+/*global window, global*/
+var util = require("util")
+var assert = require("assert")
+var now = require("date-now")
+
+var slice = Array.prototype.slice
+var console
+var times = {}
+
+if (typeof global !== "undefined" && global.console) {
+    console = global.console
+} else if (typeof window !== "undefined" && window.console) {
+    console = window.console
+} else {
+    console = {}
+}
+
+var functions = [
+    [log, "log"],
+    [info, "info"],
+    [warn, "warn"],
+    [error, "error"],
+    [time, "time"],
+    [timeEnd, "timeEnd"],
+    [trace, "trace"],
+    [dir, "dir"],
+    [consoleAssert, "assert"]
+]
+
+for (var i = 0; i < functions.length; i++) {
+    var tuple = functions[i]
+    var f = tuple[0]
+    var name = tuple[1]
+
+    if (!console[name]) {
+        console[name] = f
+    }
+}
+
+module.exports = console
+
+function log() {}
+
+function info() {
+    console.log.apply(console, arguments)
+}
+
+function warn() {
+    console.log.apply(console, arguments)
+}
+
+function error() {
+    console.warn.apply(console, arguments)
+}
+
+function time(label) {
+    times[label] = now()
+}
+
+function timeEnd(label) {
+    var time = times[label]
+    if (!time) {
+        throw new Error("No such label: " + label)
+    }
+
+    var duration = now() - time
+    console.log(label + ": " + duration + "ms")
+}
+
+function trace() {
+    var err = new Error()
+    err.name = "Trace"
+    err.message = util.format.apply(null, arguments)
+    console.error(err.stack)
+}
+
+function dir(object) {
+    console.log(util.inspect(object) + "\n")
+}
+
+function consoleAssert(expression) {
+    if (!expression) {
+        var arr = slice.call(arguments, 1)
+        assert.ok(false, util.format.apply(null, arr))
+    }
+}
+
+}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
+},{"assert":5,"date-now":15,"util":13}],15:[function(require,module,exports){
+module.exports = now
+
+function now() {
+    return new Date().getTime()
+}
+
+},{}],16:[function(require,module,exports){
+(function (global){
+/**
+ * @license
+ * Lodash <https://lodash.com/>
+ * Copyright OpenJS Foundation and other contributors <https://openjsf.org/>
+ * Released under MIT license <https://lodash.com/license>
+ * Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
+ * Copyright Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
+ */
+;(function() {
+
+  /** Used as a safe reference for `undefined` in pre-ES5 environments. */
+  var undefined;
+
+  /** Used as the semantic version number. */
+  var VERSION = '4.17.19';
+
+  /** Used as the size to enable large array optimizations. */
+  var LARGE_ARRAY_SIZE = 200;
+
+  /** Error message constants. */
+  var CORE_ERROR_TEXT = 'Unsupported core-js use. Try https://npms.io/search?q=ponyfill.',
+      FUNC_ERROR_TEXT = 'Expected a function';
+
+  /** Used to stand-in for `undefined` hash values. */
+  var HASH_UNDEFINED = '__lodash_hash_undefined__';
+
+  /** Used as the maximum memoize cache size. */
+  var MAX_MEMOIZE_SIZE = 500;
+
+  /** Used as the internal argument placeholder. */
+  var PLACEHOLDER = '__lodash_placeholder__';
+
+  /** Used to compose bitmasks for cloning. */
+  var CLONE_DEEP_FLAG = 1,
+      CLONE_FLAT_FLAG = 2,
+      CLONE_SYMBOLS_FLAG = 4;
+
+  /** Used to compose bitmasks for value comparisons. */
+  var COMPARE_PARTIAL_FLAG = 1,
+      COMPARE_UNORDERED_FLAG = 2;
+
+  /** Used to compose bitmasks for function metadata. */
+  var WRAP_BIND_FLAG = 1,
+      WRAP_BIND_KEY_FLAG = 2,
+      WRAP_CURRY_BOUND_FLAG = 4,
+      WRAP_CURRY_FLAG = 8,
+      WRAP_CURRY_RIGHT_FLAG = 16,
+      WRAP_PARTIAL_FLAG = 32,
+      WRAP_PARTIAL_RIGHT_FLAG = 64,
+      WRAP_ARY_FLAG = 128,
+      WRAP_REARG_FLAG = 256,
+      WRAP_FLIP_FLAG = 512;
+
+  /** Used as default options for `_.truncate`. */
+  var DEFAULT_TRUNC_LENGTH = 30,
+      DEFAULT_TRUNC_OMISSION = '...';
+
+  /** Used to detect hot functions by number of calls within a span of milliseconds. */
+  var HOT_COUNT = 800,
+      HOT_SPAN = 16;
+
+  /** Used to indicate the type of lazy iteratees. */
+  var LAZY_FILTER_FLAG = 1,
+      LAZY_MAP_FLAG = 2,
+      LAZY_WHILE_FLAG = 3;
+
+  /** Used as references for various `Number` constants. */
+  var INFINITY = 1 / 0,
+      MAX_SAFE_INTEGER = 9007199254740991,
+      MAX_INTEGER = 1.7976931348623157e+308,
+      NAN = 0 / 0;
+
+  /** Used as references for the maximum length and index of an array. */
+  var MAX_ARRAY_LENGTH = 4294967295,
+      MAX_ARRAY_INDEX = MAX_ARRAY_LENGTH - 1,
+      HALF_MAX_ARRAY_LENGTH = MAX_ARRAY_LENGTH >>> 1;
+
+  /** Used to associate wrap methods with their bit flags. */
+  var wrapFlags = [
+    ['ary', WRAP_ARY_FLAG],
+    ['bind', WRAP_BIND_FLAG],
+    ['bindKey', WRAP_BIND_KEY_FLAG],
+    ['curry', WRAP_CURRY_FLAG],
+    ['curryRight', WRAP_CURRY_RIGHT_FLAG],
+    ['flip', WRAP_FLIP_FLAG],
+    ['partial', WRAP_PARTIAL_FLAG],
+    ['partialRight', WRAP_PARTIAL_RIGHT_FLAG],
+    ['rearg', WRAP_REARG_FLAG]
+  ];
+
+  /** `Object#toString` result references. */
+  var argsTag = '[object Arguments]',
+      arrayTag = '[object Array]',
+      asyncTag = '[object AsyncFunction]',
+      boolTag = '[object Boolean]',
+      dateTag = '[object Date]',
+      domExcTag = '[object DOMException]',
+      errorTag = '[object Error]',
+      funcTag = '[object Function]',
+      genTag = '[object GeneratorFunction]',
+      mapTag = '[object Map]',
+      numberTag = '[object Number]',
+      nullTag = '[object Null]',
+      objectTag = '[object Object]',
+      promiseTag = '[object Promise]',
+      proxyTag = '[object Proxy]',
+      regexpTag = '[object RegExp]',
+      setTag = '[object Set]',
+      stringTag = '[object String]',
+      symbolTag = '[object Symbol]',
+      undefinedTag = '[object Undefined]',
+      weakMapTag = '[object WeakMap]',
+      weakSetTag = '[object WeakSet]';
+
+  var arrayBufferTag = '[object ArrayBuffer]',
+      dataViewTag = '[object DataView]',
+      float32Tag = '[object Float32Array]',
+      float64Tag = '[object Float64Array]',
+      int8Tag = '[object Int8Array]',
+      int16Tag = '[object Int16Array]',
+      int32Tag = '[object Int32Array]',
+      uint8Tag = '[object Uint8Array]',
+      uint8ClampedTag = '[object Uint8ClampedArray]',
+      uint16Tag = '[object Uint16Array]',
+      uint32Tag = '[object Uint32Array]';
+
+  /** Used to match empty string literals in compiled template source. */
+  var reEmptyStringLeading = /\b__p \+= '';/g,
+      reEmptyStringMiddle = /\b(__p \+=) '' \+/g,
+      reEmptyStringTrailing = /(__e\(.*?\)|\b__t\)) \+\n'';/g;
+
+  /** Used to match HTML entities and HTML characters. */
+  var reEscapedHtml = /&(?:amp|lt|gt|quot|#39);/g,
+      reUnescapedHtml = /[&<>"']/g,
+      reHasEscapedHtml = RegExp(reEscapedHtml.source),
+      reHasUnescapedHtml = RegExp(reUnescapedHtml.source);
+
+  /** Used to match template delimiters. */
+  var reEscape = /<%-([\s\S]+?)%>/g,
+      reEvaluate = /<%([\s\S]+?)%>/g,
+      reInterpolate = /<%=([\s\S]+?)%>/g;
+
+  /** Used to match property names within property paths. */
+  var reIsDeepProp = /\.|\[(?:[^[\]]*|(["'])(?:(?!\1)[^\\]|\\.)*?\1)\]/,
+      reIsPlainProp = /^\w*$/,
+      rePropName = /[^.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\\]|\\.)*?)\2)\]|(?=(?:\.|\[\])(?:\.|\[\]|$))/g;
+
+  /**
+   * Used to match `RegExp`
+   * [syntax characters](http://ecma-international.org/ecma-262/7.0/#sec-patterns).
+   */
+  var reRegExpChar = /[\\^$.*+?()[\]{}|]/g,
+      reHasRegExpChar = RegExp(reRegExpChar.source);
+
+  /** Used to match leading and trailing whitespace. */
+  var reTrim = /^\s+|\s+$/g,
+      reTrimStart = /^\s+/,
+      reTrimEnd = /\s+$/;
+
+  /** Used to match wrap detail comments. */
+  var reWrapComment = /\{(?:\n\/\* \[wrapped with .+\] \*\/)?\n?/,
+      reWrapDetails = /\{\n\/\* \[wrapped with (.+)\] \*/,
+      reSplitDetails = /,? & /;
+
+  /** Used to match words composed of alphanumeric characters. */
+  var reAsciiWord = /[^\x00-\x2f\x3a-\x40\x5b-\x60\x7b-\x7f]+/g;
+
+  /** Used to match backslashes in property paths. */
+  var reEscapeChar = /\\(\\)?/g;
+
+  /**
+   * Used to match
+   * [ES template delimiters](http://ecma-international.org/ecma-262/7.0/#sec-template-literal-lexical-components).
+   */
+  var reEsTemplate = /\$\{([^\\}]*(?:\\.[^\\}]*)*)\}/g;
+
+  /** Used to match `RegExp` flags from their coerced string values. */
+  var reFlags = /\w*$/;
+
+  /** Used to detect bad signed hexadecimal string values. */
+  var reIsBadHex = /^[-+]0x[0-9a-f]+$/i;
+
+  /** Used to detect binary string values. */
+  var reIsBinary = /^0b[01]+$/i;
+
+  /** Used to detect host constructors (Safari). */
+  var reIsHostCtor = /^\[object .+?Constructor\]$/;
+
+  /** Used to detect octal string values. */
+  var reIsOctal = /^0o[0-7]+$/i;
+
+  /** Used to detect unsigned integer values. */
+  var reIsUint = /^(?:0|[1-9]\d*)$/;
+
+  /** Used to match Latin Unicode letters (excluding mathematical operators). */
+  var reLatin = /[\xc0-\xd6\xd8-\xf6\xf8-\xff\u0100-\u017f]/g;
+
+  /** Used to ensure capturing order of template delimiters. */
+  var reNoMatch = /($^)/;
+
+  /** Used to match unescaped characters in compiled string literals. */
+  var reUnescapedString = /['\n\r\u2028\u2029\\]/g;
+
+  /** Used to compose unicode character classes. */
+  var rsAstralRange = '\\ud800-\\udfff',
+      rsComboMarksRange = '\\u0300-\\u036f',
+      reComboHalfMarksRange = '\\ufe20-\\ufe2f',
+      rsComboSymbolsRange = '\\u20d0-\\u20ff',
+      rsComboRange = rsComboMarksRange + reComboHalfMarksRange + rsComboSymbolsRange,
+      rsDingbatRange = '\\u2700-\\u27bf',
+      rsLowerRange = 'a-z\\xdf-\\xf6\\xf8-\\xff',
+      rsMathOpRange = '\\xac\\xb1\\xd7\\xf7',
+      rsNonCharRange = '\\x00-\\x2f\\x3a-\\x40\\x5b-\\x60\\x7b-\\xbf',
+      rsPunctuationRange = '\\u2000-\\u206f',
+      rsSpaceRange = ' \\t\\x0b\\f\\xa0\\ufeff\\n\\r\\u2028\\u2029\\u1680\\u180e\\u2000\\u2001\\u2002\\u2003\\u2004\\u2005\\u2006\\u2007\\u2008\\u2009\\u200a\\u202f\\u205f\\u3000',
+      rsUpperRange = 'A-Z\\xc0-\\xd6\\xd8-\\xde',
+      rsVarRange = '\\ufe0e\\ufe0f',
+      rsBreakRange = rsMathOpRange + rsNonCharRange + rsPunctuationRange + rsSpaceRange;
+
+  /** Used to compose unicode capture groups. */
+  var rsApos = "['\u2019]",
+      rsAstral = '[' + rsAstralRange + ']',
+      rsBreak = '[' + rsBreakRange + ']',
+      rsCombo = '[' + rsComboRange + ']',
+      rsDigits = '\\d+',
+      rsDingbat = '[' + rsDingbatRange + ']',
+      rsLower = '[' + rsLowerRange + ']',
+      rsMisc = '[^' + rsAstralRange + rsBreakRange + rsDigits + rsDingbatRange + rsLowerRange + rsUpperRange + ']',
+      rsFitz = '\\ud83c[\\udffb-\\udfff]',
+      rsModifier = '(?:' + rsCombo + '|' + rsFitz + ')',
+      rsNonAstral = '[^' + rsAstralRange + ']',
+      rsRegional = '(?:\\ud83c[\\udde6-\\uddff]){2}',
+      rsSurrPair = '[\\ud800-\\udbff][\\udc00-\\udfff]',
+      rsUpper = '[' + rsUpperRange + ']',
+      rsZWJ = '\\u200d';
+
+  /** Used to compose unicode regexes. */
+  var rsMiscLower = '(?:' + rsLower + '|' + rsMisc + ')',
+      rsMiscUpper = '(?:' + rsUpper + '|' + rsMisc + ')',
+      rsOptContrLower = '(?:' + rsApos + '(?:d|ll|m|re|s|t|ve))?',
+      rsOptContrUpper = '(?:' + rsApos + '(?:D|LL|M|RE|S|T|VE))?',
+      reOptMod = rsModifier + '?',
+      rsOptVar = '[' + rsVarRange + ']?',
+      rsOptJoin = '(?:' + rsZWJ + '(?:' + [rsNonAstral, rsRegional, rsSurrPair].join('|') + ')' + rsOptVar + reOptMod + ')*',
+      rsOrdLower = '\\d*(?:1st|2nd|3rd|(?![123])\\dth)(?=\\b|[A-Z_])',
+      rsOrdUpper = '\\d*(?:1ST|2ND|3RD|(?![123])\\dTH)(?=\\b|[a-z_])',
+      rsSeq = rsOptVar + reOptMod + rsOptJoin,
+      rsEmoji = '(?:' + [rsDingbat, rsRegional, rsSurrPair].join('|') + ')' + rsSeq,
+      rsSymbol = '(?:' + [rsNonAstral + rsCombo + '?', rsCombo, rsRegional, rsSurrPair, rsAstral].join('|') + ')';
+
+  /** Used to match apostrophes. */
+  var reApos = RegExp(rsApos, 'g');
+
+  /**
+   * Used to match [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks) and
+   * [combining diacritical marks for symbols](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks_for_Symbols).
+   */
+  var reComboMark = RegExp(rsCombo, 'g');
+
+  /** Used to match [string symbols](https://mathiasbynens.be/notes/javascript-unicode). */
+  var reUnicode = RegExp(rsFitz + '(?=' + rsFitz + ')|' + rsSymbol + rsSeq, 'g');
+
+  /** Used to match complex or compound words. */
+  var reUnicodeWord = RegExp([
+    rsUpper + '?' + rsLower + '+' + rsOptContrLower + '(?=' + [rsBreak, rsUpper, '$'].join('|') + ')',
+    rsMiscUpper + '+' + rsOptContrUpper + '(?=' + [rsBreak, rsUpper + rsMiscLower, '$'].join('|') + ')',
+    rsUpper + '?' + rsMiscLower + '+' + rsOptContrLower,
+    rsUpper + '+' + rsOptContrUpper,
+    rsOrdUpper,
+    rsOrdLower,
+    rsDigits,
+    rsEmoji
+  ].join('|'), 'g');
+
+  /** Used to detect strings with [zero-width joiners or code points from the astral planes](http://eev.ee/blog/2015/09/12/dark-corners-of-unicode/). */
+  var reHasUnicode = RegExp('[' + rsZWJ + rsAstralRange  + rsComboRange + rsVarRange + ']');
+
+  /** Used to detect strings that need a more robust regexp to match words. */
+  var reHasUnicodeWord = /[a-z][A-Z]|[A-Z]{2}[a-z]|[0-9][a-zA-Z]|[a-zA-Z][0-9]|[^a-zA-Z0-9 ]/;
+
+  /** Used to assign default `context` object properties. */
+  var contextProps = [
+    'Array', 'Buffer', 'DataView', 'Date', 'Error', 'Float32Array', 'Float64Array',
+    'Function', 'Int8Array', 'Int16Array', 'Int32Array', 'Map', 'Math', 'Object',
+    'Promise', 'RegExp', 'Set', 'String', 'Symbol', 'TypeError', 'Uint8Array',
+    'Uint8ClampedArray', 'Uint16Array', 'Uint32Array', 'WeakMap',
+    '_', 'clearTimeout', 'isFinite', 'parseInt', 'setTimeout'
+  ];
+
+  /** Used to make template sourceURLs easier to identify. */
+  var templateCounter = -1;
+
+  /** Used to identify `toStringTag` values of typed arrays. */
+  var typedArrayTags = {};
+  typedArrayTags[float32Tag] = typedArrayTags[float64Tag] =
+  typedArrayTags[int8Tag] = typedArrayTags[int16Tag] =
+  typedArrayTags[int32Tag] = typedArrayTags[uint8Tag] =
+  typedArrayTags[uint8ClampedTag] = typedArrayTags[uint16Tag] =
+  typedArrayTags[uint32Tag] = true;
+  typedArrayTags[argsTag] = typedArrayTags[arrayTag] =
+  typedArrayTags[arrayBufferTag] = typedArrayTags[boolTag] =
+  typedArrayTags[dataViewTag] = typedArrayTags[dateTag] =
+  typedArrayTags[errorTag] = typedArrayTags[funcTag] =
+  typedArrayTags[mapTag] = typedArrayTags[numberTag] =
+  typedArrayTags[objectTag] = typedArrayTags[regexpTag] =
+  typedArrayTags[setTag] = typedArrayTags[stringTag] =
+  typedArrayTags[weakMapTag] = false;
+
+  /** Used to identify `toStringTag` values supported by `_.clone`. */
+  var cloneableTags = {};
+  cloneableTags[argsTag] = cloneableTags[arrayTag] =
+  cloneableTags[arrayBufferTag] = cloneableTags[dataViewTag] =
+  cloneableTags[boolTag] = cloneableTags[dateTag] =
+  cloneableTags[float32Tag] = cloneableTags[float64Tag] =
+  cloneableTags[int8Tag] = cloneableTags[int16Tag] =
+  cloneableTags[int32Tag] = cloneableTags[mapTag] =
+  cloneableTags[numberTag] = cloneableTags[objectTag] =
+  cloneableTags[regexpTag] = cloneableTags[setTag] =
+  cloneableTags[stringTag] = cloneableTags[symbolTag] =
+  cloneableTags[uint8Tag] = cloneableTags[uint8ClampedTag] =
+  cloneableTags[uint16Tag] = cloneableTags[uint32Tag] = true;
+  cloneableTags[errorTag] = cloneableTags[funcTag] =
+  cloneableTags[weakMapTag] = false;
+
+  /** Used to map Latin Unicode letters to basic Latin letters. */
+  var deburredLetters = {
+    // Latin-1 Supplement block.
+    '\xc0': 'A',  '\xc1': 'A', '\xc2': 'A', '\xc3': 'A', '\xc4': 'A', '\xc5': 'A',
+    '\xe0': 'a',  '\xe1': 'a', '\xe2': 'a', '\xe3': 'a', '\xe4': 'a', '\xe5': 'a',
+    '\xc7': 'C',  '\xe7': 'c',
+    '\xd0': 'D',  '\xf0': 'd',
+    '\xc8': 'E',  '\xc9': 'E', '\xca': 'E', '\xcb': 'E',
+    '\xe8': 'e',  '\xe9': 'e', '\xea': 'e', '\xeb': 'e',
+    '\xcc': 'I',  '\xcd': 'I', '\xce': 'I', '\xcf': 'I',
+    '\xec': 'i',  '\xed': 'i', '\xee': 'i', '\xef': 'i',
+    '\xd1': 'N',  '\xf1': 'n',
+    '\xd2': 'O',  '\xd3': 'O', '\xd4': 'O', '\xd5': 'O', '\xd6': 'O', '\xd8': 'O',
+    '\xf2': 'o',  '\xf3': 'o', '\xf4': 'o', '\xf5': 'o', '\xf6': 'o', '\xf8': 'o',
+    '\xd9': 'U',  '\xda': 'U', '\xdb': 'U', '\xdc': 'U',
+    '\xf9': 'u',  '\xfa': 'u', '\xfb': 'u', '\xfc': 'u',
+    '\xdd': 'Y',  '\xfd': 'y', '\xff': 'y',
+    '\xc6': 'Ae', '\xe6': 'ae',
+    '\xde': 'Th', '\xfe': 'th',
+    '\xdf': 'ss',
+    // Latin Extended-A block.
+    '\u0100': 'A',  '\u0102': 'A', '\u0104': 'A',
+    '\u0101': 'a',  '\u0103': 'a', '\u0105': 'a',
+    '\u0106': 'C',  '\u0108': 'C', '\u010a': 'C', '\u010c': 'C',
+    '\u0107': 'c',  '\u0109': 'c', '\u010b': 'c', '\u010d': 'c',
+    '\u010e': 'D',  '\u0110': 'D', '\u010f': 'd', '\u0111': 'd',
+    '\u0112': 'E',  '\u0114': 'E', '\u0116': 'E', '\u0118': 'E', '\u011a': 'E',
+    '\u0113': 'e',  '\u0115': 'e', '\u0117': 'e', '\u0119': 'e', '\u011b': 'e',
+    '\u011c': 'G',  '\u011e': 'G', '\u0120': 'G', '\u0122': 'G',
+    '\u011d': 'g',  '\u011f': 'g', '\u0121': 'g', '\u0123': 'g',
+    '\u0124': 'H',  '\u0126': 'H', '\u0125': 'h', '\u0127': 'h',
+    '\u0128': 'I',  '\u012a': 'I', '\u012c': 'I', '\u012e': 'I', '\u0130': 'I',
+    '\u0129': 'i',  '\u012b': 'i', '\u012d': 'i', '\u012f': 'i', '\u0131': 'i',
+    '\u0134': 'J',  '\u0135': 'j',
+    '\u0136': 'K',  '\u0137': 'k', '\u0138': 'k',
+    '\u0139': 'L',  '\u013b': 'L', '\u013d': 'L', '\u013f': 'L', '\u0141': 'L',
+    '\u013a': 'l',  '\u013c': 'l', '\u013e': 'l', '\u0140': 'l', '\u0142': 'l',
+    '\u0143': 'N',  '\u0145': 'N', '\u0147': 'N', '\u014a': 'N',
+    '\u0144': 'n',  '\u0146': 'n', '\u0148': 'n', '\u014b': 'n',
+    '\u014c': 'O',  '\u014e': 'O', '\u0150': 'O',
+    '\u014d': 'o',  '\u014f': 'o', '\u0151': 'o',
+    '\u0154': 'R',  '\u0156': 'R', '\u0158': 'R',
+    '\u0155': 'r',  '\u0157': 'r', '\u0159': 'r',
+    '\u015a': 'S',  '\u015c': 'S', '\u015e': 'S', '\u0160': 'S',
+    '\u015b': 's',  '\u015d': 's', '\u015f': 's', '\u0161': 's',
+    '\u0162': 'T',  '\u0164': 'T', '\u0166': 'T',
+    '\u0163': 't',  '\u0165': 't', '\u0167': 't',
+    '\u0168': 'U',  '\u016a': 'U', '\u016c': 'U', '\u016e': 'U', '\u0170': 'U', '\u0172': 'U',
+    '\u0169': 'u',  '\u016b': 'u', '\u016d': 'u', '\u016f': 'u', '\u0171': 'u', '\u0173': 'u',
+    '\u0174': 'W',  '\u0175': 'w',
+    '\u0176': 'Y',  '\u0177': 'y', '\u0178': 'Y',
+    '\u0179': 'Z',  '\u017b': 'Z', '\u017d': 'Z',
+    '\u017a': 'z',  '\u017c': 'z', '\u017e': 'z',
+    '\u0132': 'IJ', '\u0133': 'ij',
+    '\u0152': 'Oe', '\u0153': 'oe',
+    '\u0149': "'n", '\u017f': 's'
+  };
+
+  /** Used to map characters to HTML entities. */
+  var htmlEscapes = {
+    '&': '&amp;',
+    '<': '&lt;',
+    '>': '&gt;',
+    '"': '&quot;',
+    "'": '&#39;'
+  };
+
+  /** Used to map HTML entities to characters. */
+  var htmlUnescapes = {
+    '&amp;': '&',
+    '&lt;': '<',
+    '&gt;': '>',
+    '&quot;': '"',
+    '&#39;': "'"
+  };
+
+  /** Used to escape characters for inclusion in compiled string literals. */
+  var stringEscapes = {
+    '\\': '\\',
+    "'": "'",
+    '\n': 'n',
+    '\r': 'r',
+    '\u2028': 'u2028',
+    '\u2029': 'u2029'
+  };
+
+  /** Built-in method references without a dependency on `root`. */
+  var freeParseFloat = parseFloat,
+      freeParseInt = parseInt;
+
+  /** Detect free variable `global` from Node.js. */
+  var freeGlobal = typeof global == 'object' && global && global.Object === Object && global;
+
+  /** Detect free variable `self`. */
+  var freeSelf = typeof self == 'object' && self && self.Object === Object && self;
+
+  /** Used as a reference to the global object. */
+  var root = freeGlobal || freeSelf || Function('return this')();
+
+  /** Detect free variable `exports`. */
+  var freeExports = typeof exports == 'object' && exports && !exports.nodeType && exports;
+
+  /** Detect free variable `module`. */
+  var freeModule = freeExports && typeof module == 'object' && module && !module.nodeType && module;
+
+  /** Detect the popular CommonJS extension `module.exports`. */
+  var moduleExports = freeModule && freeModule.exports === freeExports;
+
+  /** Detect free variable `process` from Node.js. */
+  var freeProcess = moduleExports && freeGlobal.process;
+
+  /** Used to access faster Node.js helpers. */
+  var nodeUtil = (function() {
+    try {
+      // Use `util.types` for Node.js 10+.
+      var types = freeModule && freeModule.require && freeModule.require('util').types;
+
+      if (types) {
+        return types;
+      }
+
+      // Legacy `process.binding('util')` for Node.js < 10.
+      return freeProcess && freeProcess.binding && freeProcess.binding('util');
+    } catch (e) {}
+  }());
+
+  /* Node.js helper references. */
+  var nodeIsArrayBuffer = nodeUtil && nodeUtil.isArrayBuffer,
+      nodeIsDate = nodeUtil && nodeUtil.isDate,
+      nodeIsMap = nodeUtil && nodeUtil.isMap,
+      nodeIsRegExp = nodeUtil && nodeUtil.isRegExp,
+      nodeIsSet = nodeUtil && nodeUtil.isSet,
+      nodeIsTypedArray = nodeUtil && nodeUtil.isTypedArray;
+
+  /*--------------------------------------------------------------------------*/
+
+  /**
+   * A faster alternative to `Function#apply`, this function invokes `func`
+   * with the `this` binding of `thisArg` and the arguments of `args`.
+   *
+   * @private
+   * @param {Function} func The function to invoke.
+   * @param {*} thisArg The `this` binding of `func`.
+   * @param {Array} args The arguments to invoke `func` with.
+   * @returns {*} Returns the result of `func`.
+   */
+  function apply(func, thisArg, args) {
+    switch (args.length) {
+      case 0: return func.call(thisArg);
+      case 1: return func.call(thisArg, args[0]);
+      case 2: return func.call(thisArg, args[0], args[1]);
+      case 3: return func.call(thisArg, args[0], args[1], args[2]);
+    }
+    return func.apply(thisArg, args);
+  }
+
+  /**
+   * A specialized version of `baseAggregator` for arrays.
+   *
+   * @private
+   * @param {Array} [array] The array to iterate over.
+   * @param {Function} setter The function to set `accumulator` values.
+   * @param {Function} iteratee The iteratee to transform keys.
+   * @param {Object} accumulator The initial aggregated object.
+   * @returns {Function} Returns `accumulator`.
+   */
+  function arrayAggregator(array, setter, iteratee, accumulator) {
+    var index = -1,
+        length = array == null ? 0 : array.length;
+
+    while (++index < length) {
+      var value = array[index];
+      setter(accumulator, value, iteratee(value), array);
+    }
+    return accumulator;
+  }
+
+  /**
+   * A specialized version of `_.forEach` for arrays without support for
+   * iteratee shorthands.
+   *
+   * @private
+   * @param {Array} [array] The array to iterate over.
+   * @param {Function} iteratee The function invoked per iteration.
+   * @returns {Array} Returns `array`.
+   */
+  function arrayEach(array, iteratee) {
+    var index = -1,
+        length = array == null ? 0 : array.length;
+
+    while (++index < length) {
+      if (iteratee(array[index], index, array) === false) {
+        break;
+      }
+    }
+    return array;
+  }
+
+  /**
+   * A specialized version of `_.forEachRight` for arrays without support for
+   * iteratee shorthands.
+   *
+   * @private
+   * @param {Array} [array] The array to iterate over.
+   * @param {Function} iteratee The function invoked per iteration.
+   * @returns {Array} Returns `array`.
+   */
+  function arrayEachRight(array, iteratee) {
+    var length = array == null ? 0 : array.length;
+
+    while (length--) {
+      if (iteratee(array[length], length, array) === false) {
+        break;
+      }
+    }
+    return array;
+  }
+
+  /**
+   * A specialized version of `_.every` for arrays without support for
+   * iteratee shorthands.
+   *
+   * @private
+   * @param {Array} [array] The array to iterate over.
+   * @param {Function} predicate The function invoked per iteration.
+   * @returns {boolean} Returns `true` if all elements pass the predicate check,
+   *  else `false`.
+   */
+  function arrayEvery(array, predicate) {
+    var index = -1,
+        length = array == null ? 0 : array.length;
+
+    while (++index < length) {
+      if (!predicate(array[index], index, array)) {
+        return false;
+      }
+    }
+    return true;
+  }
+
+  /**
+   * A specialized version of `_.filter` for arrays without support for
+   * iteratee shorthands.
+   *
+   * @private
+   * @param {Array} [array] The array to iterate over.
+   * @param {Function} predicate The function invoked per iteration.
+   * @returns {Array} Returns the new filtered array.
+   */
+  function arrayFilter(array, predicate) {
+    var index = -1,
+        length = array == null ? 0 : array.length,
+        resIndex = 0,
+        result = [];
+
+    while (++index < length) {
+      var value = array[index];
+      if (predicate(value, index, array)) {
+        result[resIndex++] = value;
+      }
+    }
+    return result;
+  }
+
+  /**
+   * A specialized version of `_.includes` for arrays without support for
+   * specifying an index to search from.
+   *
+   * @private
+   * @param {Array} [array] The array to inspect.
+   * @param {*} target The value to search for.
+   * @returns {boolean} Returns `true` if `target` is found, else `false`.
+   */
+  function arrayIncludes(array, value) {
+    var length = array == null ? 0 : array.length;
+    return !!length && baseIndexOf(array, value, 0) > -1;
+  }
+
+  /**
+   * This function is like `arrayIncludes` except that it accepts a comparator.
+   *
+   * @private
+   * @param {Array} [array] The array to inspect.
+   * @param {*} target The value to search for.
+   * @param {Function} comparator The comparator invoked per element.
+   * @returns {boolean} Returns `true` if `target` is found, else `false`.
+   */
+  function arrayIncludesWith(array, value, comparator) {
+    var index = -1,
+        length = array == null ? 0 : array.length;
+
+    while (++index < length) {
+      if (comparator(value, array[index])) {
+        return true;
+      }
+    }
+    return false;
+  }
+
+  /**
+   * A specialized version of `_.map` for arrays without support for iteratee
+   * shorthands.
+   *
+   * @private
+   * @param {Array} [array] The array to iterate over.
+   * @param {Function} iteratee The function invoked per iteration.
+   * @returns {Array} Returns the new mapped array.
+   */
+  function arrayMap(array, iteratee) {
+    var index = -1,
+        length = array == null ? 0 : array.length,
+        result = Array(length);
+
+    while (++index < length) {
+      result[index] = iteratee(array[index], index, array);
+    }
+    return result;
+  }
+
+  /**
+   * Appends the elements of `values` to `array`.
+   *
+   * @private
+   * @param {Array} array The array to modify.
+   * @param {Array} values The values to append.
+   * @returns {Array} Returns `array`.
+   */
+  function arrayPush(array, values) {
+    var index = -1,
+        length = values.length,
+        offset = array.length;
+
+    while (++index < length) {
+      array[offset + index] = values[index];
+    }
+    return array;
+  }
+
+  /**
+   * A specialized version of `_.reduce` for arrays without support for
+   * iteratee shorthands.
+   *
+   * @private
+   * @param {Array} [array] The array to iterate over.
+   * @param {Function} iteratee The function invoked per iteration.
+   * @param {*} [accumulator] The initial value.
+   * @param {boolean} [initAccum] Specify using the first element of `array` as
+   *  the initial value.
+   * @returns {*} Returns the accumulated value.
+   */
+  function arrayReduce(array, iteratee, accumulator, initAccum) {
+    var index = -1,
+        length = array == null ? 0 : array.length;
+
+    if (initAccum && length) {
+      accumulator = array[++index];
+    }
+    while (++index < length) {
+      accumulator = iteratee(accumulator, array[index], index, array);
+    }
+    return accumulator;
+  }
+
+  /**
+   * A specialized version of `_.reduceRight` for arrays without support for
+   * iteratee shorthands.
+   *
+   * @private
+   * @param {Array} [array] The array to iterate over.
+   * @param {Function} iteratee The function invoked per iteration.
+   * @param {*} [accumulator] The initial value.
+   * @param {boolean} [initAccum] Specify using the last element of `array` as
+   *  the initial value.
+   * @returns {*} Returns the accumulated value.
+   */
+  function arrayReduceRight(array, iteratee, accumulator, initAccum) {
+    var length = array == null ? 0 : array.length;
+    if (initAccum && length) {
+      accumulator = array[--length];
+    }
+    while (length--) {
+      accumulator = iteratee(accumulator, array[length], length, array);
+    }
+    return accumulator;
+  }
+
+  /**
+   * A specialized version of `_.some` for arrays without support for iteratee
+   * shorthands.
+   *
+   * @private
+   * @param {Array} [array] The array to iterate over.
+   * @param {Function} predicate The function invoked per iteration.
+   * @returns {boolean} Returns `true` if any element passes the predicate check,
+   *  else `false`.
+   */
+  function arraySome(array, predicate) {
+    var index = -1,
+        length = array == null ? 0 : array.length;
+
+    while (++index < length) {
+      if (predicate(array[index], index, array)) {
+        return true;
+      }
+    }
+    return false;
+  }
+
+  /**
+   * Gets the size of an ASCII `string`.
+   *
+   * @private
+   * @param {string} string The string inspect.
+   * @returns {number} Returns the string size.
+   */
+  var asciiSize = baseProperty('length');
+
+  /**
+   * Converts an ASCII `string` to an array.
+   *
+   * @private
+   * @param {string} string The string to convert.
+   * @returns {Array} Returns the converted array.
+   */
+  function asciiToArray(string) {
+    return string.split('');
+  }
+
+  /**
+   * Splits an ASCII `string` into an array of its words.
+   *
+   * @private
+   * @param {string} The string to inspect.
+   * @returns {Array} Returns the words of `string`.
+   */
+  function asciiWords(string) {
+    return string.match(reAsciiWord) || [];
+  }
+
+  /**
+   * The base implementation of methods like `_.findKey` and `_.findLastKey`,
+   * without support for iteratee shorthands, which iterates over `collection`
+   * using `eachFunc`.
+   *
+   * @private
+   * @param {Array|Object} collection The collection to inspect.
+   * @param {Function} predicate The function invoked per iteration.
+   * @param {Function} eachFunc The function to iterate over `collection`.
+   * @returns {*} Returns the found element or its key, else `undefined`.
+   */
+  function baseFindKey(collection, predicate, eachFunc) {
+    var result;
+    eachFunc(collection, function(value, key, collection) {
+      if (predicate(value, key, collection)) {
+        result = key;
+        return false;
+      }
+    });
+    return result;
+  }
+
+  /**
+   * The base implementation of `_.findIndex` and `_.findLastIndex` without
+   * support for iteratee shorthands.
+   *
+   * @private
+   * @param {Array} array The array to inspect.
+   * @param {Function} predicate The function invoked per iteration.
+   * @param {number} fromIndex The index to search from.
+   * @param {boolean} [fromRight] Specify iterating from right to left.
+   * @returns {number} Returns the index of the matched value, else `-1`.
+   */
+  function baseFindIndex(array, predicate, fromIndex, fromRight) {
+    var length = array.length,
+        index = fromIndex + (fromRight ? 1 : -1);
+
+    while ((fromRight ? index-- : ++index < length)) {
+      if (predicate(array[index], index, array)) {
+        return index;
+      }
+    }
+    return -1;
+  }
+
+  /**
+   * The base implementation of `_.indexOf` without `fromIndex` bounds checks.
+   *
+   * @private
+   * @param {Array} array The array to inspect.
+   * @param {*} value The value to search for.
+   * @param {number} fromIndex The index to search from.
+   * @returns {number} Returns the index of the matched value, else `-1`.
+   */
+  function baseIndexOf(array, value, fromIndex) {
+    return value === value
+      ? strictIndexOf(array, value, fromIndex)
+      : baseFindIndex(array, baseIsNaN, fromIndex);
+  }
+
+  /**
+   * This function is like `baseIndexOf` except that it accepts a comparator.
+   *
+   * @private
+   * @param {Array} array The array to inspect.
+   * @param {*} value The value to search for.
+   * @param {number} fromIndex The index to search from.
+   * @param {Function} comparator The comparator invoked per element.
+   * @returns {number} Returns the index of the matched value, else `-1`.
+   */
+  function baseIndexOfWith(array, value, fromIndex, comparator) {
+    var index = fromIndex - 1,
+        length = array.length;
+
+    while (++index < length) {
+      if (comparator(array[index], value)) {
+        return index;
+      }
+    }
+    return -1;
+  }
+
+  /**
+   * The base implementation of `_.isNaN` without support for number objects.
+   *
+   * @private
+   * @param {*} value The value to check.
+   * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`.
+   */
+  function baseIsNaN(value) {
+    return value !== value;
+  }
+
+  /**
+   * The base implementation of `_.mean` and `_.meanBy` without support for
+   * iteratee shorthands.
+   *
+   * @private
+   * @param {Array} array The array to iterate over.
+   * @param {Function} iteratee The function invoked per iteration.
+   * @returns {number} Returns the mean.
+   */
+  function baseMean(array, iteratee) {
+    var length = array == null ? 0 : array.length;
+    return length ? (baseSum(array, iteratee) / length) : NAN;
+  }
+
+  /**
+   * The base implementation of `_.property` without support for deep paths.
+   *
+   * @private
+   * @param {string} key The key of the property to get.
+   * @returns {Function} Returns the new accessor function.
+   */
+  function baseProperty(key) {
+    return function(object) {
+      return object == null ? undefined : object[key];
+    };
+  }
+
+  /**
+   * The base implementation of `_.propertyOf` without support for deep paths.
+   *
+   * @private
+   * @param {Object} object The object to query.
+   * @returns {Function} Returns the new accessor function.
+   */
+  function basePropertyOf(object) {
+    return function(key) {
+      return object == null ? undefined : object[key];
+    };
+  }
+
+  /**
+   * The base implementation of `_.reduce` and `_.reduceRight`, without support
+   * for iteratee shorthands, which iterates over `collection` using `eachFunc`.
+   *
+   * @private
+   * @param {Array|Object} collection The collection to iterate over.
+   * @param {Function} iteratee The function invoked per iteration.
+   * @param {*} accumulator The initial value.
+   * @param {boolean} initAccum Specify using the first or last element of
+   *  `collection` as the initial value.
+   * @param {Function} eachFunc The function to iterate over `collection`.
+   * @returns {*} Returns the accumulated value.
+   */
+  function baseReduce(collection, iteratee, accumulator, initAccum, eachFunc) {
+    eachFunc(collection, function(value, index, collection) {
+      accumulator = initAccum
+        ? (initAccum = false, value)
+        : iteratee(accumulator, value, index, collection);
+    });
+    return accumulator;
+  }
+
+  /**
+   * The base implementation of `_.sortBy` which uses `comparer` to define the
+   * sort order of `array` and replaces criteria objects with their corresponding
+   * values.
+   *
+   * @private
+   * @param {Array} array The array to sort.
+   * @param {Function} comparer The function to define sort order.
+   * @returns {Array} Returns `array`.
+   */
+  function baseSortBy(array, comparer) {
+    var length = array.length;
+
+    array.sort(comparer);
+    while (length--) {
+      array[length] = array[length].value;
+    }
+    return array;
+  }
+
+  /**
+   * The base implementation of `_.sum` and `_.sumBy` without support for
+   * iteratee shorthands.
+   *
+   * @private
+   * @param {Array} array The array to iterate over.
+   * @param {Function} iteratee The function invoked per iteration.
+   * @returns {number} Returns the sum.
+   */
+  function baseSum(array, iteratee) {
+    var result,
+        index = -1,
+        length = array.length;
+
+    while (++index < length) {
+      var current = iteratee(array[index]);
+      if (current !== undefined) {
+        result = result === undefined ? current : (result + current);
+      }
+    }
+    return result;
+  }
+
+  /**
+   * The base implementation of `_.times` without support for iteratee shorthands
+   * or max array length checks.
+   *
+   * @private
+   * @param {number} n The number of times to invoke `iteratee`.
+   * @param {Function} iteratee The function invoked per iteration.
+   * @returns {Array} Returns the array of results.
+   */
+  function baseTimes(n, iteratee) {
+    var index = -1,
+        result = Array(n);
+
+    while (++index < n) {
+      result[index] = iteratee(index);
+    }
+    return result;
+  }
+
+  /**
+   * The base implementation of `_.toPairs` and `_.toPairsIn` which creates an array
+   * of key-value pairs for `object` corresponding to the property names of `props`.
+   *
+   * @private
+   * @param {Object} object The object to query.
+   * @param {Array} props The property names to get values for.
+   * @returns {Object} Returns the key-value pairs.
+   */
+  function baseToPairs(object, props) {
+    return arrayMap(props, function(key) {
+      return [key, object[key]];
+    });
+  }
+
+  /**
+   * The base implementation of `_.unary` without support for storing metadata.
+   *
+   * @private
+   * @param {Function} func The function to cap arguments for.
+   * @returns {Function} Returns the new capped function.
+   */
+  function baseUnary(func) {
+    return function(value) {
+      return func(value);
+    };
+  }
+
+  /**
+   * The base implementation of `_.values` and `_.valuesIn` which creates an
+   * array of `object` property values corresponding to the property names
+   * of `props`.
+   *
+   * @private
+   * @param {Object} object The object to query.
+   * @param {Array} props The property names to get values for.
+   * @returns {Object} Returns the array of property values.
+   */
+  function baseValues(object, props) {
+    return arrayMap(props, function(key) {
+      return object[key];
+    });
+  }
+
+  /**
+   * Checks if a `cache` value for `key` exists.
+   *
+   * @private
+   * @param {Object} cache The cache to query.
+   * @param {string} key The key of the entry to check.
+   * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
+   */
+  function cacheHas(cache, key) {
+    return cache.has(key);
+  }
+
+  /**
+   * Used by `_.trim` and `_.trimStart` to get the index of the first string symbol
+   * that is not found in the character symbols.
+   *
+   * @private
+   * @param {Array} strSymbols The string symbols to inspect.
+   * @param {Array} chrSymbols The character symbols to find.
+   * @returns {number} Returns the index of the first unmatched string symbol.
+   */
+  function charsStartIndex(strSymbols, chrSymbols) {
+    var index = -1,
+        length = strSymbols.length;
+
+    while (++index < length && baseIndexOf(chrSymbols, strSymbols[index], 0) > -1) {}
+    return index;
+  }
+
+  /**
+   * Used by `_.trim` and `_.trimEnd` to get the index of the last string symbol
+   * that is not found in the character symbols.
+   *
+   * @private
+   * @param {Array} strSymbols The string symbols to inspect.
+   * @param {Array} chrSymbols The character symbols to find.
+   * @returns {number} Returns the index of the last unmatched string symbol.
+   */
+  function charsEndIndex(strSymbols, chrSymbols) {
+    var index = strSymbols.length;
+
+    while (index-- && baseIndexOf(chrSymbols, strSymbols[index], 0) > -1) {}
+    return index;
+  }
+
+  /**
+   * Gets the number of `placeholder` occurrences in `array`.
+   *
+   * @private
+   * @param {Array} array The array to inspect.
+   * @param {*} placeholder The placeholder to search for.
+   * @returns {number} Returns the placeholder count.
+   */
+  function countHolders(array, placeholder) {
+    var length = array.length,
+        result = 0;
+
+    while (length--) {
+      if (array[length] === placeholder) {
+        ++result;
+      }
+    }
+    return result;
+  }
+
+  /**
+   * Used by `_.deburr` to convert Latin-1 Supplement and Latin Extended-A
+   * letters to basic Latin letters.
+   *
+   * @private
+   * @param {string} letter The matched letter to deburr.
+   * @returns {string} Returns the deburred letter.
+   */
+  var deburrLetter = basePropertyOf(deburredLetters);
+
+  /**
+   * Used by `_.escape` to convert characters to HTML entities.
+   *
+   * @private
+   * @param {string} chr The matched character to escape.
+   * @returns {string} Returns the escaped character.
+   */
+  var escapeHtmlChar = basePropertyOf(htmlEscapes);
+
+  /**
+   * Used by `_.template` to escape characters for inclusion in compiled string literals.
+   *
+   * @private
+   * @param {string} chr The matched character to escape.
+   * @returns {string} Returns the escaped character.
+   */
+  function escapeStringChar(chr) {
+    return '\\' + stringEscapes[chr];
+  }
+
+  /**
+   * Gets the value at `key` of `object`.
+   *
+   * @private
+   * @param {Object} [object] The object to query.
+   * @param {string} key The key of the property to get.
+   * @returns {*} Returns the property value.
+   */
+  function getValue(object, key) {
+    return object == null ? undefined : object[key];
+  }
+
+  /**
+   * Checks if `string` contains Unicode symbols.
+   *
+   * @private
+   * @param {string} string The string to inspect.
+   * @returns {boolean} Returns `true` if a symbol is found, else `false`.
+   */
+  function hasUnicode(string) {
+    return reHasUnicode.test(string);
+  }
+
+  /**
+   * Checks if `string` contains a word composed of Unicode symbols.
+   *
+   * @private
+   * @param {string} string The string to inspect.
+   * @returns {boolean} Returns `true` if a word is found, else `false`.
+   */
+  function hasUnicodeWord(string) {
+    return reHasUnicodeWord.test(string);
+  }
+
+  /**
+   * Converts `iterator` to an array.
+   *
+   * @private
+   * @param {Object} iterator The iterator to convert.
+   * @returns {Array} Returns the converted array.
+   */
+  function iteratorToArray(iterator) {
+    var data,
+        result = [];
+
+    while (!(data = iterator.next()).done) {
+      result.push(data.value);
+    }
+    return result;
+  }
+
+  /**
+   * Converts `map` to its key-value pairs.
+   *
+   * @private
+   * @param {Object} map The map to convert.
+   * @returns {Array} Returns the key-value pairs.
+   */
+  function mapToArray(map) {
+    var index = -1,
+        result = Array(map.size);
+
+    map.forEach(function(value, key) {
+      result[++index] = [key, value];
+    });
+    return result;
+  }
+
+  /**
+   * Creates a unary function that invokes `func` with its argument transformed.
+   *
+   * @private
+   * @param {Function} func The function to wrap.
+   * @param {Function} transform The argument transform.
+   * @returns {Function} Returns the new function.
+   */
+  function overArg(func, transform) {
+    return function(arg) {
+      return func(transform(arg));
+    };
+  }
+
+  /**
+   * Replaces all `placeholder` elements in `array` with an internal placeholder
+   * and returns an array of their indexes.
+   *
+   * @private
+   * @param {Array} array The array to modify.
+   * @param {*} placeholder The placeholder to replace.
+   * @returns {Array} Returns the new array of placeholder indexes.
+   */
+  function replaceHolders(array, placeholder) {
+    var index = -1,
+        length = array.length,
+        resIndex = 0,
+        result = [];
+
+    while (++index < length) {
+      var value = array[index];
+      if (value === placeholder || value === PLACEHOLDER) {
+        array[index] = PLACEHOLDER;
+        result[resIndex++] = index;
+      }
+    }
+    return result;
+  }
+
+  /**
+   * Converts `set` to an array of its values.
+   *
+   * @private
+   * @param {Object} set The set to convert.
+   * @returns {Array} Returns the values.
+   */
+  function setToArray(set) {
+    var index = -1,
+        result = Array(set.size);
+
+    set.forEach(function(value) {
+      result[++index] = value;
+    });
+    return result;
+  }
+
+  /**
+   * Converts `set` to its value-value pairs.
+   *
+   * @private
+   * @param {Object} set The set to convert.
+   * @returns {Array} Returns the value-value pairs.
+   */
+  function setToPairs(set) {
+    var index = -1,
+        result = Array(set.size);
+
+    set.forEach(function(value) {
+      result[++index] = [value, value];
+    });
+    return result;
+  }
+
+  /**
+   * A specialized version of `_.indexOf` which performs strict equality
+   * comparisons of values, i.e. `===`.
+   *
+   * @private
+   * @param {Array} array The array to inspect.
+   * @param {*} value The value to search for.
+   * @param {number} fromIndex The index to search from.
+   * @returns {number} Returns the index of the matched value, else `-1`.
+   */
+  function strictIndexOf(array, value, fromIndex) {
+    var index = fromIndex - 1,
+        length = array.length;
+
+    while (++index < length) {
+      if (array[index] === value) {
+        return index;
+      }
+    }
+    return -1;
+  }
+
+  /**
+   * A specialized version of `_.lastIndexOf` which performs strict equality
+   * comparisons of values, i.e. `===`.
+   *
+   * @private
+   * @param {Array} array The array to inspect.
+   * @param {*} value The value to search for.
+   * @param {number} fromIndex The index to search from.
+   * @returns {number} Returns the index of the matched value, else `-1`.
+   */
+  function strictLastIndexOf(array, value, fromIndex) {
+    var index = fromIndex + 1;
+    while (index--) {
+      if (array[index] === value) {
+        return index;
+      }
+    }
+    return index;
+  }
+
+  /**
+   * Gets the number of symbols in `string`.
+   *
+   * @private
+   * @param {string} string The string to inspect.
+   * @returns {number} Returns the string size.
+   */
+  function stringSize(string) {
+    return hasUnicode(string)
+      ? unicodeSize(string)
+      : asciiSize(string);
+  }
+
+  /**
+   * Converts `string` to an array.
+   *
+   * @private
+   * @param {string} string The string to convert.
+   * @returns {Array} Returns the converted array.
+   */
+  function stringToArray(string) {
+    return hasUnicode(string)
+      ? unicodeToArray(string)
+      : asciiToArray(string);
+  }
+
+  /**
+   * Used by `_.unescape` to convert HTML entities to characters.
+   *
+   * @private
+   * @param {string} chr The matched character to unescape.
+   * @returns {string} Returns the unescaped character.
+   */
+  var unescapeHtmlChar = basePropertyOf(htmlUnescapes);
+
+  /**
+   * Gets the size of a Unicode `string`.
+   *
+   * @private
+   * @param {string} string The string inspect.
+   * @returns {number} Returns the string size.
+   */
+  function unicodeSize(string) {
+    var result = reUnicode.lastIndex = 0;
+    while (reUnicode.test(string)) {
+      ++result;
+    }
+    return result;
+  }
+
+  /**
+   * Converts a Unicode `string` to an array.
+   *
+   * @private
+   * @param {string} string The string to convert.
+   * @returns {Array} Returns the converted array.
+   */
+  function unicodeToArray(string) {
+    return string.match(reUnicode) || [];
+  }
+
+  /**
+   * Splits a Unicode `string` into an array of its words.
+   *
+   * @private
+   * @param {string} The string to inspect.
+   * @returns {Array} Returns the words of `string`.
+   */
+  function unicodeWords(string) {
+    return string.match(reUnicodeWord) || [];
+  }
+
+  /*--------------------------------------------------------------------------*/
+
+  /**
+   * Create a new pristine `lodash` function using the `context` object.
+   *
+   * @static
+   * @memberOf _
+   * @since 1.1.0
+   * @category Util
+   * @param {Object} [context=root] The context object.
+   * @returns {Function} Returns a new `lodash` function.
+   * @example
+   *
+   * _.mixin({ 'foo': _.constant('foo') });
+   *
+   * var lodash = _.runInContext();
+   * lodash.mixin({ 'bar': lodash.constant('bar') });
+   *
+   * _.isFunction(_.foo);
+   * // => true
+   * _.isFunction(_.bar);
+   * // => false
+   *
+   * lodash.isFunction(lodash.foo);
+   * // => false
+   * lodash.isFunction(lodash.bar);
+   * // => true
+   *
+   * // Create a suped-up `defer` in Node.js.
+   * var defer = _.runInContext({ 'setTimeout': setImmediate }).defer;
+   */
+  var runInContext = (function runInContext(context) {
+    context = context == null ? root : _.defaults(root.Object(), context, _.pick(root, contextProps));
+
+    /** Built-in constructor references. */
+    var Array = context.Array,
+        Date = context.Date,
+        Error = context.Error,
+        Function = context.Function,
+        Math = context.Math,
+        Object = context.Object,
+        RegExp = context.RegExp,
+        String = context.String,
+        TypeError = context.TypeError;
+
+    /** Used for built-in method references. */
+    var arrayProto = Array.prototype,
+        funcProto = Function.prototype,
+        objectProto = Object.prototype;
+
+    /** Used to detect overreaching core-js shims. */
+    var coreJsData = context['__core-js_shared__'];
+
+    /** Used to resolve the decompiled source of functions. */
+    var funcToString = funcProto.toString;
+
+    /** Used to check objects for own properties. */
+    var hasOwnProperty = objectProto.hasOwnProperty;
+
+    /** Used to generate unique IDs. */
+    var idCounter = 0;
+
+    /** Used to detect methods masquerading as native. */
+    var maskSrcKey = (function() {
+      var uid = /[^.]+$/.exec(coreJsData && coreJsData.keys && coreJsData.keys.IE_PROTO || '');
+      return uid ? ('Symbol(src)_1.' + uid) : '';
+    }());
+
+    /**
+     * Used to resolve the
+     * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
+     * of values.
+     */
+    var nativeObjectToString = objectProto.toString;
+
+    /** Used to infer the `Object` constructor. */
+    var objectCtorString = funcToString.call(Object);
+
+    /** Used to restore the original `_` reference in `_.noConflict`. */
+    var oldDash = root._;
+
+    /** Used to detect if a method is native. */
+    var reIsNative = RegExp('^' +
+      funcToString.call(hasOwnProperty).replace(reRegExpChar, '\\$&')
+      .replace(/hasOwnProperty|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?') + '$'
+    );
+
+    /** Built-in value references. */
+    var Buffer = moduleExports ? context.Buffer : undefined,
+        Symbol = context.Symbol,
+        Uint8Array = context.Uint8Array,
+        allocUnsafe = Buffer ? Buffer.allocUnsafe : undefined,
+        getPrototype = overArg(Object.getPrototypeOf, Object),
+        objectCreate = Object.create,
+        propertyIsEnumerable = objectProto.propertyIsEnumerable,
+        splice = arrayProto.splice,
+        spreadableSymbol = Symbol ? Symbol.isConcatSpreadable : undefined,
+        symIterator = Symbol ? Symbol.iterator : undefined,
+        symToStringTag = Symbol ? Symbol.toStringTag : undefined;
+
+    var defineProperty = (function() {
+      try {
+        var func = getNative(Object, 'defineProperty');
+        func({}, '', {});
+        return func;
+      } catch (e) {}
+    }());
+
+    /** Mocked built-ins. */
+    var ctxClearTimeout = context.clearTimeout !== root.clearTimeout && context.clearTimeout,
+        ctxNow = Date && Date.now !== root.Date.now && Date.now,
+        ctxSetTimeout = context.setTimeout !== root.setTimeout && context.setTimeout;
+
+    /* Built-in method references for those with the same name as other `lodash` methods. */
+    var nativeCeil = Math.ceil,
+        nativeFloor = Math.floor,
+        nativeGetSymbols = Object.getOwnPropertySymbols,
+        nativeIsBuffer = Buffer ? Buffer.isBuffer : undefined,
+        nativeIsFinite = context.isFinite,
+        nativeJoin = arrayProto.join,
+        nativeKeys = overArg(Object.keys, Object),
+        nativeMax = Math.max,
+        nativeMin = Math.min,
+        nativeNow = Date.now,
+        nativeParseInt = context.parseInt,
+        nativeRandom = Math.random,
+        nativeReverse = arrayProto.reverse;
+
+    /* Built-in method references that are verified to be native. */
+    var DataView = getNative(context, 'DataView'),
+        Map = getNative(context, 'Map'),
+        Promise = getNative(context, 'Promise'),
+        Set = getNative(context, 'Set'),
+        WeakMap = getNative(context, 'WeakMap'),
+        nativeCreate = getNative(Object, 'create');
+
+    /** Used to store function metadata. */
+    var metaMap = WeakMap && new WeakMap;
+
+    /** Used to lookup unminified function names. */
+    var realNames = {};
+
+    /** Used to detect maps, sets, and weakmaps. */
+    var dataViewCtorString = toSource(DataView),
+        mapCtorString = toSource(Map),
+        promiseCtorString = toSource(Promise),
+        setCtorString = toSource(Set),
+        weakMapCtorString = toSource(WeakMap);
+
+    /** Used to convert symbols to primitives and strings. */
+    var symbolProto = Symbol ? Symbol.prototype : undefined,
+        symbolValueOf = symbolProto ? symbolProto.valueOf : undefined,
+        symbolToString = symbolProto ? symbolProto.toString : undefined;
+
+    /*------------------------------------------------------------------------*/
+
+    /**
+     * Creates a `lodash` object which wraps `value` to enable implicit method
+     * chain sequences. Methods that operate on and return arrays, collections,
+     * and functions can be chained together. Methods that retrieve a single value
+     * or may return a primitive value will automatically end the chain sequence
+     * and return the unwrapped value. Otherwise, the value must be unwrapped
+     * with `_#value`.
+     *
+     * Explicit chain sequences, which must be unwrapped with `_#value`, may be
+     * enabled using `_.chain`.
+     *
+     * The execution of chained methods is lazy, that is, it's deferred until
+     * `_#value` is implicitly or explicitly called.
+     *
+     * Lazy evaluation allows several methods to support shortcut fusion.
+     * Shortcut fusion is an optimization to merge iteratee calls; this avoids
+     * the creation of intermediate arrays and can greatly reduce the number of
+     * iteratee executions. Sections of a chain sequence qualify for shortcut
+     * fusion if the section is applied to an array and iteratees accept only
+     * one argument. The heuristic for whether a section qualifies for shortcut
+     * fusion is subject to change.
+     *
+     * Chaining is supported in custom builds as long as the `_#value` method is
+     * directly or indirectly included in the build.
+     *
+     * In addition to lodash methods, wrappers have `Array` and `String` methods.
+     *
+     * The wrapper `Array` methods are:
+     * `concat`, `join`, `pop`, `push`, `shift`, `sort`, `splice`, and `unshift`
+     *
+     * The wrapper `String` methods are:
+     * `replace` and `split`
+     *
+     * The wrapper methods that support shortcut fusion are:
+     * `at`, `compact`, `drop`, `dropRight`, `dropWhile`, `filter`, `find`,
+     * `findLast`, `head`, `initial`, `last`, `map`, `reject`, `reverse`, `slice`,
+     * `tail`, `take`, `takeRight`, `takeRightWhile`, `takeWhile`, and `toArray`
+     *
+     * The chainable wrapper methods are:
+     * `after`, `ary`, `assign`, `assignIn`, `assignInWith`, `assignWith`, `at`,
+     * `before`, `bind`, `bindAll`, `bindKey`, `castArray`, `chain`, `chunk`,
+     * `commit`, `compact`, `concat`, `conforms`, `constant`, `countBy`, `create`,
+     * `curry`, `debounce`, `defaults`, `defaultsDeep`, `defer`, `delay`,
+     * `difference`, `differenceBy`, `differenceWith`, `drop`, `dropRight`,
+     * `dropRightWhile`, `dropWhile`, `extend`, `extendWith`, `fill`, `filter`,
+     * `flatMap`, `flatMapDeep`, `flatMapDepth`, `flatten`, `flattenDeep`,
+     * `flattenDepth`, `flip`, `flow`, `flowRight`, `fromPairs`, `functions`,
+     * `functionsIn`, `groupBy`, `initial`, `intersection`, `intersectionBy`,
+     * `intersectionWith`, `invert`, `invertBy`, `invokeMap`, `iteratee`, `keyBy`,
+     * `keys`, `keysIn`, `map`, `mapKeys`, `mapValues`, `matches`, `matchesProperty`,
+     * `memoize`, `merge`, `mergeWith`, `method`, `methodOf`, `mixin`, `negate`,
+     * `nthArg`, `omit`, `omitBy`, `once`, `orderBy`, `over`, `overArgs`,
+     * `overEvery`, `overSome`, `partial`, `partialRight`, `partition`, `pick`,
+     * `pickBy`, `plant`, `property`, `propertyOf`, `pull`, `pullAll`, `pullAllBy`,
+     * `pullAllWith`, `pullAt`, `push`, `range`, `rangeRight`, `rearg`, `reject`,
+     * `remove`, `rest`, `reverse`, `sampleSize`, `set`, `setWith`, `shuffle`,
+     * `slice`, `sort`, `sortBy`, `splice`, `spread`, `tail`, `take`, `takeRight`,
+     * `takeRightWhile`, `takeWhile`, `tap`, `throttle`, `thru`, `toArray`,
+     * `toPairs`, `toPairsIn`, `toPath`, `toPlainObject`, `transform`, `unary`,
+     * `union`, `unionBy`, `unionWith`, `uniq`, `uniqBy`, `uniqWith`, `unset`,
+     * `unshift`, `unzip`, `unzipWith`, `update`, `updateWith`, `values`,
+     * `valuesIn`, `without`, `wrap`, `xor`, `xorBy`, `xorWith`, `zip`,
+     * `zipObject`, `zipObjectDeep`, and `zipWith`
+     *
+     * The wrapper methods that are **not** chainable by default are:
+     * `add`, `attempt`, `camelCase`, `capitalize`, `ceil`, `clamp`, `clone`,
+     * `cloneDeep`, `cloneDeepWith`, `cloneWith`, `conformsTo`, `deburr`,
+     * `defaultTo`, `divide`, `each`, `eachRight`, `endsWith`, `eq`, `escape`,
+     * `escapeRegExp`, `every`, `find`, `findIndex`, `findKey`, `findLast`,
+     * `findLastIndex`, `findLastKey`, `first`, `floor`, `forEach`, `forEachRight`,
+     * `forIn`, `forInRight`, `forOwn`, `forOwnRight`, `get`, `gt`, `gte`, `has`,
+     * `hasIn`, `head`, `identity`, `includes`, `indexOf`, `inRange`, `invoke`,
+     * `isArguments`, `isArray`, `isArrayBuffer`, `isArrayLike`, `isArrayLikeObject`,
+     * `isBoolean`, `isBuffer`, `isDate`, `isElement`, `isEmpty`, `isEqual`,
+     * `isEqualWith`, `isError`, `isFinite`, `isFunction`, `isInteger`, `isLength`,
+     * `isMap`, `isMatch`, `isMatchWith`, `isNaN`, `isNative`, `isNil`, `isNull`,
+     * `isNumber`, `isObject`, `isObjectLike`, `isPlainObject`, `isRegExp`,
+     * `isSafeInteger`, `isSet`, `isString`, `isUndefined`, `isTypedArray`,
+     * `isWeakMap`, `isWeakSet`, `join`, `kebabCase`, `last`, `lastIndexOf`,
+     * `lowerCase`, `lowerFirst`, `lt`, `lte`, `max`, `maxBy`, `mean`, `meanBy`,
+     * `min`, `minBy`, `multiply`, `noConflict`, `noop`, `now`, `nth`, `pad`,
+     * `padEnd`, `padStart`, `parseInt`, `pop`, `random`, `reduce`, `reduceRight`,
+     * `repeat`, `result`, `round`, `runInContext`, `sample`, `shift`, `size`,
+     * `snakeCase`, `some`, `sortedIndex`, `sortedIndexBy`, `sortedLastIndex`,
+     * `sortedLastIndexBy`, `startCase`, `startsWith`, `stubArray`, `stubFalse`,
+     * `stubObject`, `stubString`, `stubTrue`, `subtract`, `sum`, `sumBy`,
+     * `template`, `times`, `toFinite`, `toInteger`, `toJSON`, `toLength`,
+     * `toLower`, `toNumber`, `toSafeInteger`, `toString`, `toUpper`, `trim`,
+     * `trimEnd`, `trimStart`, `truncate`, `unescape`, `uniqueId`, `upperCase`,
+     * `upperFirst`, `value`, and `words`
+     *
+     * @name _
+     * @constructor
+     * @category Seq
+     * @param {*} value The value to wrap in a `lodash` instance.
+     * @returns {Object} Returns the new `lodash` wrapper instance.
+     * @example
+     *
+     * function square(n) {
+     *   return n * n;
+     * }
+     *
+     * var wrapped = _([1, 2, 3]);
+     *
+     * // Returns an unwrapped value.
+     * wrapped.reduce(_.add);
+     * // => 6
+     *
+     * // Returns a wrapped value.
+     * var squares = wrapped.map(square);
+     *
+     * _.isArray(squares);
+     * // => false
+     *
+     * _.isArray(squares.value());
+     * // => true
+     */
+    function lodash(value) {
+      if (isObjectLike(value) && !isArray(value) && !(value instanceof LazyWrapper)) {
+        if (value instanceof LodashWrapper) {
+          return value;
+        }
+        if (hasOwnProperty.call(value, '__wrapped__')) {
+          return wrapperClone(value);
+        }
+      }
+      return new LodashWrapper(value);
+    }
+
+    /**
+     * The base implementation of `_.create` without support for assigning
+     * properties to the created object.
+     *
+     * @private
+     * @param {Object} proto The object to inherit from.
+     * @returns {Object} Returns the new object.
+     */
+    var baseCreate = (function() {
+      function object() {}
+      return function(proto) {
+        if (!isObject(proto)) {
+          return {};
+        }
+        if (objectCreate) {
+          return objectCreate(proto);
+        }
+        object.prototype = proto;
+        var result = new object;
+        object.prototype = undefined;
+        return result;
+      };
+    }());
+
+    /**
+     * The function whose prototype chain sequence wrappers inherit from.
+     *
+     * @private
+     */
+    function baseLodash() {
+      // No operation performed.
+    }
+
+    /**
+     * The base constructor for creating `lodash` wrapper objects.
+     *
+     * @private
+     * @param {*} value The value to wrap.
+     * @param {boolean} [chainAll] Enable explicit method chain sequences.
+     */
+    function LodashWrapper(value, chainAll) {
+      this.__wrapped__ = value;
+      this.__actions__ = [];
+      this.__chain__ = !!chainAll;
+      this.__index__ = 0;
+      this.__values__ = undefined;
+    }
+
+    /**
+     * By default, the template delimiters used by lodash are like those in
+     * embedded Ruby (ERB) as well as ES2015 template strings. Change the
+     * following template settings to use alternative delimiters.
+     *
+     * @static
+     * @memberOf _
+     * @type {Object}
+     */
+    lodash.templateSettings = {
+
+      /**
+       * Used to detect `data` property values to be HTML-escaped.
+       *
+       * @memberOf _.templateSettings
+       * @type {RegExp}
+       */
+      'escape': reEscape,
+
+      /**
+       * Used to detect code to be evaluated.
+       *
+       * @memberOf _.templateSettings
+       * @type {RegExp}
+       */
+      'evaluate': reEvaluate,
+
+      /**
+       * Used to detect `data` property values to inject.
+       *
+       * @memberOf _.templateSettings
+       * @type {RegExp}
+       */
+      'interpolate': reInterpolate,
+
+      /**
+       * Used to reference the data object in the template text.
+       *
+       * @memberOf _.templateSettings
+       * @type {string}
+       */
+      'variable': '',
+
+      /**
+       * Used to import variables into the compiled template.
+       *
+       * @memberOf _.templateSettings
+       * @type {Object}
+       */
+      'imports': {
+
+        /**
+         * A reference to the `lodash` function.
+         *
+         * @memberOf _.templateSettings.imports
+         * @type {Function}
+         */
+        '_': lodash
+      }
+    };
+
+    // Ensure wrappers are instances of `baseLodash`.
+    lodash.prototype = baseLodash.prototype;
+    lodash.prototype.constructor = lodash;
+
+    LodashWrapper.prototype = baseCreate(baseLodash.prototype);
+    LodashWrapper.prototype.constructor = LodashWrapper;
+
+    /*------------------------------------------------------------------------*/
+
+    /**
+     * Creates a lazy wrapper object which wraps `value` to enable lazy evaluation.
+     *
+     * @private
+     * @constructor
+     * @param {*} value The value to wrap.
+     */
+    function LazyWrapper(value) {
+      this.__wrapped__ = value;
+      this.__actions__ = [];
+      this.__dir__ = 1;
+      this.__filtered__ = false;
+      this.__iteratees__ = [];
+      this.__takeCount__ = MAX_ARRAY_LENGTH;
+      this.__views__ = [];
+    }
+
+    /**
+     * Creates a clone of the lazy wrapper object.
+     *
+     * @private
+     * @name clone
+     * @memberOf LazyWrapper
+     * @returns {Object} Returns the cloned `LazyWrapper` object.
+     */
+    function lazyClone() {
+      var result = new LazyWrapper(this.__wrapped__);
+      result.__actions__ = copyArray(this.__actions__);
+      result.__dir__ = this.__dir__;
+      result.__filtered__ = this.__filtered__;
+      result.__iteratees__ = copyArray(this.__iteratees__);
+      result.__takeCount__ = this.__takeCount__;
+      result.__views__ = copyArray(this.__views__);
+      return result;
+    }
+
+    /**
+     * Reverses the direction of lazy iteration.
+     *
+     * @private
+     * @name reverse
+     * @memberOf LazyWrapper
+     * @returns {Object} Returns the new reversed `LazyWrapper` object.
+     */
+    function lazyReverse() {
+      if (this.__filtered__) {
+        var result = new LazyWrapper(this);
+        result.__dir__ = -1;
+        result.__filtered__ = true;
+      } else {
+        result = this.clone();
+        result.__dir__ *= -1;
+      }
+      return result;
+    }
+
+    /**
+     * Extracts the unwrapped value from its lazy wrapper.
+     *
+     * @private
+     * @name value
+     * @memberOf LazyWrapper
+     * @returns {*} Returns the unwrapped value.
+     */
+    function lazyValue() {
+      var array = this.__wrapped__.value(),
+          dir = this.__dir__,
+          isArr = isArray(array),
+          isRight = dir < 0,
+          arrLength = isArr ? array.length : 0,
+          view = getView(0, arrLength, this.__views__),
+          start = view.start,
+          end = view.end,
+          length = end - start,
+          index = isRight ? end : (start - 1),
+          iteratees = this.__iteratees__,
+          iterLength = iteratees.length,
+          resIndex = 0,
+          takeCount = nativeMin(length, this.__takeCount__);
+
+      if (!isArr || (!isRight && arrLength == length && takeCount == length)) {
+        return baseWrapperValue(array, this.__actions__);
+      }
+      var result = [];
+
+      outer:
+      while (length-- && resIndex < takeCount) {
+        index += dir;
+
+        var iterIndex = -1,
+            value = array[index];
+
+        while (++iterIndex < iterLength) {
+          var data = iteratees[iterIndex],
+              iteratee = data.iteratee,
+              type = data.type,
+              computed = iteratee(value);
+
+          if (type == LAZY_MAP_FLAG) {
+            value = computed;
+          } else if (!computed) {
+            if (type == LAZY_FILTER_FLAG) {
+              continue outer;
+            } else {
+              break outer;
+            }
+          }
+        }
+        result[resIndex++] = value;
+      }
+      return result;
+    }
+
+    // Ensure `LazyWrapper` is an instance of `baseLodash`.
+    LazyWrapper.prototype = baseCreate(baseLodash.prototype);
+    LazyWrapper.prototype.constructor = LazyWrapper;
+
+    /*------------------------------------------------------------------------*/
+
+    /**
+     * Creates a hash object.
+     *
+     * @private
+     * @constructor
+     * @param {Array} [entries] The key-value pairs to cache.
+     */
+    function Hash(entries) {
+      var index = -1,
+          length = entries == null ? 0 : entries.length;
+
+      this.clear();
+      while (++index < length) {
+        var entry = entries[index];
+        this.set(entry[0], entry[1]);
+      }
+    }
+
+    /**
+     * Removes all key-value entries from the hash.
+     *
+     * @private
+     * @name clear
+     * @memberOf Hash
+     */
+    function hashClear() {
+      this.__data__ = nativeCreate ? nativeCreate(null) : {};
+      this.size = 0;
+    }
+
+    /**
+     * Removes `key` and its value from the hash.
+     *
+     * @private
+     * @name delete
+     * @memberOf Hash
+     * @param {Object} hash The hash to modify.
+     * @param {string} key The key of the value to remove.
+     * @returns {boolean} Returns `true` if the entry was removed, else `false`.
+     */
+    function hashDelete(key) {
+      var result = this.has(key) && delete this.__data__[key];
+      this.size -= result ? 1 : 0;
+      return result;
+    }
+
+    /**
+     * Gets the hash value for `key`.
+     *
+     * @private
+     * @name get
+     * @memberOf Hash
+     * @param {string} key The key of the value to get.
+     * @returns {*} Returns the entry value.
+     */
+    function hashGet(key) {
+      var data = this.__data__;
+      if (nativeCreate) {
+        var result = data[key];
+        return result === HASH_UNDEFINED ? undefined : result;
+      }
+      return hasOwnProperty.call(data, key) ? data[key] : undefined;
+    }
+
+    /**
+     * Checks if a hash value for `key` exists.
+     *
+     * @private
+     * @name has
+     * @memberOf Hash
+     * @param {string} key The key of the entry to check.
+     * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
+     */
+    function hashHas(key) {
+      var data = this.__data__;
+      return nativeCreate ? (data[key] !== undefined) : hasOwnProperty.call(data, key);
+    }
+
+    /**
+     * Sets the hash `key` to `value`.
+     *
+     * @private
+     * @name set
+     * @memberOf Hash
+     * @param {string} key The key of the value to set.
+     * @param {*} value The value to set.
+     * @returns {Object} Returns the hash instance.
+     */
+    function hashSet(key, value) {
+      var data = this.__data__;
+      this.size += this.has(key) ? 0 : 1;
+      data[key] = (nativeCreate && value === undefined) ? HASH_UNDEFINED : value;
+      return this;
+    }
+
+    // Add methods to `Hash`.
+    Hash.prototype.clear = hashClear;
+    Hash.prototype['delete'] = hashDelete;
+    Hash.prototype.get = hashGet;
+    Hash.prototype.has = hashHas;
+    Hash.prototype.set = hashSet;
+
+    /*------------------------------------------------------------------------*/
+
+    /**
+     * Creates an list cache object.
+     *
+     * @private
+     * @constructor
+     * @param {Array} [entries] The key-value pairs to cache.
+     */
+    function ListCache(entries) {
+      var index = -1,
+          length = entries == null ? 0 : entries.length;
+
+      this.clear();
+      while (++index < length) {
+        var entry = entries[index];
+        this.set(entry[0], entry[1]);
+      }
+    }
+
+    /**
+     * Removes all key-value entries from the list cache.
+     *
+     * @private
+     * @name clear
+     * @memberOf ListCache
+     */
+    function listCacheClear() {
+      this.__data__ = [];
+      this.size = 0;
+    }
+
+    /**
+     * Removes `key` and its value from the list cache.
+     *
+     * @private
+     * @name delete
+     * @memberOf ListCache
+     * @param {string} key The key of the value to remove.
+     * @returns {boolean} Returns `true` if the entry was removed, else `false`.
+     */
+    function listCacheDelete(key) {
+      var data = this.__data__,
+          index = assocIndexOf(data, key);
+
+      if (index < 0) {
+        return false;
+      }
+      var lastIndex = data.length - 1;
+      if (index == lastIndex) {
+        data.pop();
+      } else {
+        splice.call(data, index, 1);
+      }
+      --this.size;
+      return true;
+    }
+
+    /**
+     * Gets the list cache value for `key`.
+     *
+     * @private
+     * @name get
+     * @memberOf ListCache
+     * @param {string} key The key of the value to get.
+     * @returns {*} Returns the entry value.
+     */
+    function listCacheGet(key) {
+      var data = this.__data__,
+          index = assocIndexOf(data, key);
+
+      return index < 0 ? undefined : data[index][1];
+    }
+
+    /**
+     * Checks if a list cache value for `key` exists.
+     *
+     * @private
+     * @name has
+     * @memberOf ListCache
+     * @param {string} key The key of the entry to check.
+     * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
+     */
+    function listCacheHas(key) {
+      return assocIndexOf(this.__data__, key) > -1;
+    }
+
+    /**
+     * Sets the list cache `key` to `value`.
+     *
+     * @private
+     * @name set
+     * @memberOf ListCache
+     * @param {string} key The key of the value to set.
+     * @param {*} value The value to set.
+     * @returns {Object} Returns the list cache instance.
+     */
+    function listCacheSet(key, value) {
+      var data = this.__data__,
+          index = assocIndexOf(data, key);
+
+      if (index < 0) {
+        ++this.size;
+        data.push([key, value]);
+      } else {
+        data[index][1] = value;
+      }
+      return this;
+    }
+
+    // Add methods to `ListCache`.
+    ListCache.prototype.clear = listCacheClear;
+    ListCache.prototype['delete'] = listCacheDelete;
+    ListCache.prototype.get = listCacheGet;
+    ListCache.prototype.has = listCacheHas;
+    ListCache.prototype.set = listCacheSet;
+
+    /*------------------------------------------------------------------------*/
+
+    /**
+     * Creates a map cache object to store key-value pairs.
+     *
+     * @private
+     * @constructor
+     * @param {Array} [entries] The key-value pairs to cache.
+     */
+    function MapCache(entries) {
+      var index = -1,
+          length = entries == null ? 0 : entries.length;
+
+      this.clear();
+      while (++index < length) {
+        var entry = entries[index];
+        this.set(entry[0], entry[1]);
+      }
+    }
+
+    /**
+     * Removes all key-value entries from the map.
+     *
+     * @private
+     * @name clear
+     * @memberOf MapCache
+     */
+    function mapCacheClear() {
+      this.size = 0;
+      this.__data__ = {
+        'hash': new Hash,
+        'map': new (Map || ListCache),
+        'string': new Hash
+      };
+    }
+
+    /**
+     * Removes `key` and its value from the map.
+     *
+     * @private
+     * @name delete
+     * @memberOf MapCache
+     * @param {string} key The key of the value to remove.
+     * @returns {boolean} Returns `true` if the entry was removed, else `false`.
+     */
+    function mapCacheDelete(key) {
+      var result = getMapData(this, key)['delete'](key);
+      this.size -= result ? 1 : 0;
+      return result;
+    }
+
+    /**
+     * Gets the map value for `key`.
+     *
+     * @private
+     * @name get
+     * @memberOf MapCache
+     * @param {string} key The key of the value to get.
+     * @returns {*} Returns the entry value.
+     */
+    function mapCacheGet(key) {
+      return getMapData(this, key).get(key);
+    }
+
+    /**
+     * Checks if a map value for `key` exists.
+     *
+     * @private
+     * @name has
+     * @memberOf MapCache
+     * @param {string} key The key of the entry to check.
+     * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
+     */
+    function mapCacheHas(key) {
+      return getMapData(this, key).has(key);
+    }
+
+    /**
+     * Sets the map `key` to `value`.
+     *
+     * @private
+     * @name set
+     * @memberOf MapCache
+     * @param {string} key The key of the value to set.
+     * @param {*} value The value to set.
+     * @returns {Object} Returns the map cache instance.
+     */
+    function mapCacheSet(key, value) {
+      var data = getMapData(this, key),
+          size = data.size;
+
+      data.set(key, value);
+      this.size += data.size == size ? 0 : 1;
+      return this;
+    }
+
+    // Add methods to `MapCache`.
+    MapCache.prototype.clear = mapCacheClear;
+    MapCache.prototype['delete'] = mapCacheDelete;
+    MapCache.prototype.get = mapCacheGet;
+    MapCache.prototype.has = mapCacheHas;
+    MapCache.prototype.set = mapCacheSet;
+
+    /*------------------------------------------------------------------------*/
+
+    /**
+     *
+     * Creates an array cache object to store unique values.
+     *
+     * @private
+     * @constructor
+     * @param {Array} [values] The values to cache.
+     */
+    function SetCache(values) {
+      var index = -1,
+          length = values == null ? 0 : values.length;
+
+      this.__data__ = new MapCache;
+      while (++index < length) {
+        this.add(values[index]);
+      }
+    }
+
+    /**
+     * Adds `value` to the array cache.
+     *
+     * @private
+     * @name add
+     * @memberOf SetCache
+     * @alias push
+     * @param {*} value The value to cache.
+     * @returns {Object} Returns the cache instance.
+     */
+    function setCacheAdd(value) {
+      this.__data__.set(value, HASH_UNDEFINED);
+      return this;
+    }
+
+    /**
+     * Checks if `value` is in the array cache.
+     *
+     * @private
+     * @name has
+     * @memberOf SetCache
+     * @param {*} value The value to search for.
+     * @returns {number} Returns `true` if `value` is found, else `false`.
+     */
+    function setCacheHas(value) {
+      return this.__data__.has(value);
+    }
+
+    // Add methods to `SetCache`.
+    SetCache.prototype.add = SetCache.prototype.push = setCacheAdd;
+    SetCache.prototype.has = setCacheHas;
+
+    /*------------------------------------------------------------------------*/
+
+    /**
+     * Creates a stack cache object to store key-value pairs.
+     *
+     * @private
+     * @constructor
+     * @param {Array} [entries] The key-value pairs to cache.
+     */
+    function Stack(entries) {
+      var data = this.__data__ = new ListCache(entries);
+      this.size = data.size;
+    }
+
+    /**
+     * Removes all key-value entries from the stack.
+     *
+     * @private
+     * @name clear
+     * @memberOf Stack
+     */
+    function stackClear() {
+      this.__data__ = new ListCache;
+      this.size = 0;
+    }
+
+    /**
+     * Removes `key` and its value from the stack.
+     *
+     * @private
+     * @name delete
+     * @memberOf Stack
+     * @param {string} key The key of the value to remove.
+     * @returns {boolean} Returns `true` if the entry was removed, else `false`.
+     */
+    function stackDelete(key) {
+      var data = this.__data__,
+          result = data['delete'](key);
+
+      this.size = data.size;
+      return result;
+    }
+
+    /**
+     * Gets the stack value for `key`.
+     *
+     * @private
+     * @name get
+     * @memberOf Stack
+     * @param {string} key The key of the value to get.
+     * @returns {*} Returns the entry value.
+     */
+    function stackGet(key) {
+      return this.__data__.get(key);
+    }
+
+    /**
+     * Checks if a stack value for `key` exists.
+     *
+     * @private
+     * @name has
+     * @memberOf Stack
+     * @param {string} key The key of the entry to check.
+     * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
+     */
+    function stackHas(key) {
+      return this.__data__.has(key);
+    }
+
+    /**
+     * Sets the stack `key` to `value`.
+     *
+     * @private
+     * @name set
+     * @memberOf Stack
+     * @param {string} key The key of the value to set.
+     * @param {*} value The value to set.
+     * @returns {Object} Returns the stack cache instance.
+     */
+    function stackSet(key, value) {
+      var data = this.__data__;
+      if (data instanceof ListCache) {
+        var pairs = data.__data__;
+        if (!Map || (pairs.length < LARGE_ARRAY_SIZE - 1)) {
+          pairs.push([key, value]);
+          this.size = ++data.size;
+          return this;
+        }
+        data = this.__data__ = new MapCache(pairs);
+      }
+      data.set(key, value);
+      this.size = data.size;
+      return this;
+    }
+
+    // Add methods to `Stack`.
+    Stack.prototype.clear = stackClear;
+    Stack.prototype['delete'] = stackDelete;
+    Stack.prototype.get = stackGet;
+    Stack.prototype.has = stackHas;
+    Stack.prototype.set = stackSet;
+
+    /*------------------------------------------------------------------------*/
+
+    /**
+     * Creates an array of the enumerable property names of the array-like `value`.
+     *
+     * @private
+     * @param {*} value The value to query.
+     * @param {boolean} inherited Specify returning inherited property names.
+     * @returns {Array} Returns the array of property names.
+     */
+    function arrayLikeKeys(value, inherited) {
+      var isArr = isArray(value),
+          isArg = !isArr && isArguments(value),
+          isBuff = !isArr && !isArg && isBuffer(value),
+          isType = !isArr && !isArg && !isBuff && isTypedArray(value),
+          skipIndexes = isArr || isArg || isBuff || isType,
+          result = skipIndexes ? baseTimes(value.length, String) : [],
+          length = result.length;
+
+      for (var key in value) {
+        if ((inherited || hasOwnProperty.call(value, key)) &&
+            !(skipIndexes && (
+               // Safari 9 has enumerable `arguments.length` in strict mode.
+               key == 'length' ||
+               // Node.js 0.10 has enumerable non-index properties on buffers.
+               (isBuff && (key == 'offset' || key == 'parent')) ||
+               // PhantomJS 2 has enumerable non-index properties on typed arrays.
+               (isType && (key == 'buffer' || key == 'byteLength' || key == 'byteOffset')) ||
+               // Skip index properties.
+               isIndex(key, length)
+            ))) {
+          result.push(key);
+        }
+      }
+      return result;
+    }
+
+    /**
+     * A specialized version of `_.sample` for arrays.
+     *
+     * @private
+     * @param {Array} array The array to sample.
+     * @returns {*} Returns the random element.
+     */
+    function arraySample(array) {
+      var length = array.length;
+      return length ? array[baseRandom(0, length - 1)] : undefined;
+    }
+
+    /**
+     * A specialized version of `_.sampleSize` for arrays.
+     *
+     * @private
+     * @param {Array} array The array to sample.
+     * @param {number} n The number of elements to sample.
+     * @returns {Array} Returns the random elements.
+     */
+    function arraySampleSize(array, n) {
+      return shuffleSelf(copyArray(array), baseClamp(n, 0, array.length));
+    }
+
+    /**
+     * A specialized version of `_.shuffle` for arrays.
+     *
+     * @private
+     * @param {Array} array The array to shuffle.
+     * @returns {Array} Returns the new shuffled array.
+     */
+    function arrayShuffle(array) {
+      return shuffleSelf(copyArray(array));
+    }
+
+    /**
+     * This function is like `assignValue` except that it doesn't assign
+     * `undefined` values.
+     *
+     * @private
+     * @param {Object} object The object to modify.
+     * @param {string} key The key of the property to assign.
+     * @param {*} value The value to assign.
+     */
+    function assignMergeValue(object, key, value) {
+      if ((value !== undefined && !eq(object[key], value)) ||
+          (value === undefined && !(key in object))) {
+        baseAssignValue(object, key, value);
+      }
+    }
+
+    /**
+     * Assigns `value` to `key` of `object` if the existing value is not equivalent
+     * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
+     * for equality comparisons.
+     *
+     * @private
+     * @param {Object} object The object to modify.
+     * @param {string} key The key of the property to assign.
+     * @param {*} value The value to assign.
+     */
+    function assignValue(object, key, value) {
+      var objValue = object[key];
+      if (!(hasOwnProperty.call(object, key) && eq(objValue, value)) ||
+          (value === undefined && !(key in object))) {
+        baseAssignValue(object, key, value);
+      }
+    }
+
+    /**
+     * Gets the index at which the `key` is found in `array` of key-value pairs.
+     *
+     * @private
+     * @param {Array} array The array to inspect.
+     * @param {*} key The key to search for.
+     * @returns {number} Returns the index of the matched value, else `-1`.
+     */
+    function assocIndexOf(array, key) {
+      var length = array.length;
+      while (length--) {
+        if (eq(array[length][0], key)) {
+          return length;
+        }
+      }
+      return -1;
+    }
+
+    /**
+     * Aggregates elements of `collection` on `accumulator` with keys transformed
+     * by `iteratee` and values set by `setter`.
+     *
+     * @private
+     * @param {Array|Object} collection The collection to iterate over.
+     * @param {Function} setter The function to set `accumulator` values.
+     * @param {Function} iteratee The iteratee to transform keys.
+     * @param {Object} accumulator The initial aggregated object.
+     * @returns {Function} Returns `accumulator`.
+     */
+    function baseAggregator(collection, setter, iteratee, accumulator) {
+      baseEach(collection, function(value, key, collection) {
+        setter(accumulator, value, iteratee(value), collection);
+      });
+      return accumulator;
+    }
+
+    /**
+     * The base implementation of `_.assign` without support for multiple sources
+     * or `customizer` functions.
+     *
+     * @private
+     * @param {Object} object The destination object.
+     * @param {Object} source The source object.
+     * @returns {Object} Returns `object`.
+     */
+    function baseAssign(object, source) {
+      return object && copyObject(source, keys(source), object);
+    }
+
+    /**
+     * The base implementation of `_.assignIn` without support for multiple sources
+     * or `customizer` functions.
+     *
+     * @private
+     * @param {Object} object The destination object.
+     * @param {Object} source The source object.
+     * @returns {Object} Returns `object`.
+     */
+    function baseAssignIn(object, source) {
+      return object && copyObject(source, keysIn(source), object);
+    }
+
+    /**
+     * The base implementation of `assignValue` and `assignMergeValue` without
+     * value checks.
+     *
+     * @private
+     * @param {Object} object The object to modify.
+     * @param {string} key The key of the property to assign.
+     * @param {*} value The value to assign.
+     */
+    function baseAssignValue(object, key, value) {
+      if (key == '__proto__' && defineProperty) {
+        defineProperty(object, key, {
+          'configurable': true,
+          'enumerable': true,
+          'value': value,
+          'writable': true
+        });
+      } else {
+        object[key] = value;
+      }
+    }
+
+    /**
+     * The base implementation of `_.at` without support for individual paths.
+     *
+     * @private
+     * @param {Object} object The object to iterate over.
+     * @param {string[]} paths The property paths to pick.
+     * @returns {Array} Returns the picked elements.
+     */
+    function baseAt(object, paths) {
+      var index = -1,
+          length = paths.length,
+          result = Array(length),
+          skip = object == null;
+
+      while (++index < length) {
+        result[index] = skip ? undefined : get(object, paths[index]);
+      }
+      return result;
+    }
+
+    /**
+     * The base implementation of `_.clamp` which doesn't coerce arguments.
+     *
+     * @private
+     * @param {number} number The number to clamp.
+     * @param {number} [lower] The lower bound.
+     * @param {number} upper The upper bound.
+     * @returns {number} Returns the clamped number.
+     */
+    function baseClamp(number, lower, upper) {
+      if (number === number) {
+        if (upper !== undefined) {
+          number = number <= upper ? number : upper;
+        }
+        if (lower !== undefined) {
+          number = number >= lower ? number : lower;
+        }
+      }
+      return number;
+    }
+
+    /**
+     * The base implementation of `_.clone` and `_.cloneDeep` which tracks
+     * traversed objects.
+     *
+     * @private
+     * @param {*} value The value to clone.
+     * @param {boolean} bitmask The bitmask flags.
+     *  1 - Deep clone
+     *  2 - Flatten inherited properties
+     *  4 - Clone symbols
+     * @param {Function} [customizer] The function to customize cloning.
+     * @param {string} [key] The key of `value`.
+     * @param {Object} [object] The parent object of `value`.
+     * @param {Object} [stack] Tracks traversed objects and their clone counterparts.
+     * @returns {*} Returns the cloned value.
+     */
+    function baseClone(value, bitmask, customizer, key, object, stack) {
+      var result,
+          isDeep = bitmask & CLONE_DEEP_FLAG,
+          isFlat = bitmask & CLONE_FLAT_FLAG,
+          isFull = bitmask & CLONE_SYMBOLS_FLAG;
+
+      if (customizer) {
+        result = object ? customizer(value, key, object, stack) : customizer(value);
+      }
+      if (result !== undefined) {
+        return result;
+      }
+      if (!isObject(value)) {
+        return value;
+      }
+      var isArr = isArray(value);
+      if (isArr) {
+        result = initCloneArray(value);
+        if (!isDeep) {
+          return copyArray(value, result);
+        }
+      } else {
+        var tag = getTag(value),
+            isFunc = tag == funcTag || tag == genTag;
+
+        if (isBuffer(value)) {
+          return cloneBuffer(value, isDeep);
+        }
+        if (tag == objectTag || tag == argsTag || (isFunc && !object)) {
+          result = (isFlat || isFunc) ? {} : initCloneObject(value);
+          if (!isDeep) {
+            return isFlat
+              ? copySymbolsIn(value, baseAssignIn(result, value))
+              : copySymbols(value, baseAssign(result, value));
+          }
+        } else {
+          if (!cloneableTags[tag]) {
+            return object ? value : {};
+          }
+          result = initCloneByTag(value, tag, isDeep);
+        }
+      }
+      // Check for circular references and return its corresponding clone.
+      stack || (stack = new Stack);
+      var stacked = stack.get(value);
+      if (stacked) {
+        return stacked;
+      }
+      stack.set(value, result);
+
+      if (isSet(value)) {
+        value.forEach(function(subValue) {
+          result.add(baseClone(subValue, bitmask, customizer, subValue, value, stack));
+        });
+      } else if (isMap(value)) {
+        value.forEach(function(subValue, key) {
+          result.set(key, baseClone(subValue, bitmask, customizer, key, value, stack));
+        });
+      }
+
+      var keysFunc = isFull
+        ? (isFlat ? getAllKeysIn : getAllKeys)
+        : (isFlat ? keysIn : keys);
+
+      var props = isArr ? undefined : keysFunc(value);
+      arrayEach(props || value, function(subValue, key) {
+        if (props) {
+          key = subValue;
+          subValue = value[key];
+        }
+        // Recursively populate clone (susceptible to call stack limits).
+        assignValue(result, key, baseClone(subValue, bitmask, customizer, key, value, stack));
+      });
+      return result;
+    }
+
+    /**
+     * The base implementation of `_.conforms` which doesn't clone `source`.
+     *
+     * @private
+     * @param {Object} source The object of property predicates to conform to.
+     * @returns {Function} Returns the new spec function.
+     */
+    function baseConforms(source) {
+      var props = keys(source);
+      return function(object) {
+        return baseConformsTo(object, source, props);
+      };
+    }
+
+    /**
+     * The base implementation of `_.conformsTo` which accepts `props` to check.
+     *
+     * @private
+     * @param {Object} object The object to inspect.
+     * @param {Object} source The object of property predicates to conform to.
+     * @returns {boolean} Returns `true` if `object` conforms, else `false`.
+     */
+    function baseConformsTo(object, source, props) {
+      var length = props.length;
+      if (object == null) {
+        return !length;
+      }
+      object = Object(object);
+      while (length--) {
+        var key = props[length],
+            predicate = source[key],
+            value = object[key];
+
+        if ((value === undefined && !(key in object)) || !predicate(value)) {
+          return false;
+        }
+      }
+      return true;
+    }
+
+    /**
+     * The base implementation of `_.delay` and `_.defer` which accepts `args`
+     * to provide to `func`.
+     *
+     * @private
+     * @param {Function} func The function to delay.
+     * @param {number} wait The number of milliseconds to delay invocation.
+     * @param {Array} args The arguments to provide to `func`.
+     * @returns {number|Object} Returns the timer id or timeout object.
+     */
+    function baseDelay(func, wait, args) {
+      if (typeof func != 'function') {
+        throw new TypeError(FUNC_ERROR_TEXT);
+      }
+      return setTimeout(function() { func.apply(undefined, args); }, wait);
+    }
+
+    /**
+     * The base implementation of methods like `_.difference` without support
+     * for excluding multiple arrays or iteratee shorthands.
+     *
+     * @private
+     * @param {Array} array The array to inspect.
+     * @param {Array} values The values to exclude.
+     * @param {Function} [iteratee] The iteratee invoked per element.
+     * @param {Function} [comparator] The comparator invoked per element.
+     * @returns {Array} Returns the new array of filtered values.
+     */
+    function baseDifference(array, values, iteratee, comparator) {
+      var index = -1,
+          includes = arrayIncludes,
+          isCommon = true,
+          length = array.length,
+          result = [],
+          valuesLength = values.length;
+
+      if (!length) {
+        return result;
+      }
+      if (iteratee) {
+        values = arrayMap(values, baseUnary(iteratee));
+      }
+      if (comparator) {
+        includes = arrayIncludesWith;
+        isCommon = false;
+      }
+      else if (values.length >= LARGE_ARRAY_SIZE) {
+        includes = cacheHas;
+        isCommon = false;
+        values = new SetCache(values);
+      }
+      outer:
+      while (++index < length) {
+        var value = array[index],
+            computed = iteratee == null ? value : iteratee(value);
+
+        value = (comparator || value !== 0) ? value : 0;
+        if (isCommon && computed === computed) {
+          var valuesIndex = valuesLength;
+          while (valuesIndex--) {
+            if (values[valuesIndex] === computed) {
+              continue outer;
+            }
+          }
+          result.push(value);
+        }
+        else if (!includes(values, computed, comparator)) {
+          result.push(value);
+        }
+      }
+      return result;
+    }
+
+    /**
+     * The base implementation of `_.forEach` without support for iteratee shorthands.
+     *
+     * @private
+     * @param {Array|Object} collection The collection to iterate over.
+     * @param {Function} iteratee The function invoked per iteration.
+     * @returns {Array|Object} Returns `collection`.
+     */
+    var baseEach = createBaseEach(baseForOwn);
+
+    /**
+     * The base implementation of `_.forEachRight` without support for iteratee shorthands.
+     *
+     * @private
+     * @param {Array|Object} collection The collection to iterate over.
+     * @param {Function} iteratee The function invoked per iteration.
+     * @returns {Array|Object} Returns `collection`.
+     */
+    var baseEachRight = createBaseEach(baseForOwnRight, true);
+
+    /**
+     * The base implementation of `_.every` without support for iteratee shorthands.
+     *
+     * @private
+     * @param {Array|Object} collection The collection to iterate over.
+     * @param {Function} predicate The function invoked per iteration.
+     * @returns {boolean} Returns `true` if all elements pass the predicate check,
+     *  else `false`
+     */
+    function baseEvery(collection, predicate) {
+      var result = true;
+      baseEach(collection, function(value, index, collection) {
+        result = !!predicate(value, index, collection);
+        return result;
+      });
+      return result;
+    }
+
+    /**
+     * The base implementation of methods like `_.max` and `_.min` which accepts a
+     * `comparator` to determine the extremum value.
+     *
+     * @private
+     * @param {Array} array The array to iterate over.
+     * @param {Function} iteratee The iteratee invoked per iteration.
+     * @param {Function} comparator The comparator used to compare values.
+     * @returns {*} Returns the extremum value.
+     */
+    function baseExtremum(array, iteratee, comparator) {
+      var index = -1,
+          length = array.length;
+
+      while (++index < length) {
+        var value = array[index],
+            current = iteratee(value);
+
+        if (current != null && (computed === undefined
+              ? (current === current && !isSymbol(current))
+              : comparator(current, computed)
+            )) {
+          var computed = current,
+              result = value;
+        }
+      }
+      return result;
+    }
+
+    /**
+     * The base implementation of `_.fill` without an iteratee call guard.
+     *
+     * @private
+     * @param {Array} array The array to fill.
+     * @param {*} value The value to fill `array` with.
+     * @param {number} [start=0] The start position.
+     * @param {number} [end=array.length] The end position.
+     * @returns {Array} Returns `array`.
+     */
+    function baseFill(array, value, start, end) {
+      var length = array.length;
+
+      start = toInteger(start);
+      if (start < 0) {
+        start = -start > length ? 0 : (length + start);
+      }
+      end = (end === undefined || end > length) ? length : toInteger(end);
+      if (end < 0) {
+        end += length;
+      }
+      end = start > end ? 0 : toLength(end);
+      while (start < end) {
+        array[start++] = value;
+      }
+      return array;
+    }
+
+    /**
+     * The base implementation of `_.filter` without support for iteratee shorthands.
+     *
+     * @private
+     * @param {Array|Object} collection The collection to iterate over.
+     * @param {Function} predicate The function invoked per iteration.
+     * @returns {Array} Returns the new filtered array.
+     */
+    function baseFilter(collection, predicate) {
+      var result = [];
+      baseEach(collection, function(value, index, collection) {
+        if (predicate(value, index, collection)) {
+          result.push(value);
+        }
+      });
+      return result;
+    }
+
+    /**
+     * The base implementation of `_.flatten` with support for restricting flattening.
+     *
+     * @private
+     * @param {Array} array The array to flatten.
+     * @param {number} depth The maximum recursion depth.
+     * @param {boolean} [predicate=isFlattenable] The function invoked per iteration.
+     * @param {boolean} [isStrict] Restrict to values that pass `predicate` checks.
+     * @param {Array} [result=[]] The initial result value.
+     * @returns {Array} Returns the new flattened array.
+     */
+    function baseFlatten(array, depth, predicate, isStrict, result) {
+      var index = -1,
+          length = array.length;
+
+      predicate || (predicate = isFlattenable);
+      result || (result = []);
+
+      while (++index < length) {
+        var value = array[index];
+        if (depth > 0 && predicate(value)) {
+          if (depth > 1) {
+            // Recursively flatten arrays (susceptible to call stack limits).
+            baseFlatten(value, depth - 1, predicate, isStrict, result);
+          } else {
+            arrayPush(result, value);
+          }
+        } else if (!isStrict) {
+          result[result.length] = value;
+        }
+      }
+      return result;
+    }
+
+    /**
+     * The base implementation of `baseForOwn` which iterates over `object`
+     * properties returned by `keysFunc` and invokes `iteratee` for each property.
+     * Iteratee functions may exit iteration early by explicitly returning `false`.
+     *
+     * @private
+     * @param {Object} object The object to iterate over.
+     * @param {Function} iteratee The function invoked per iteration.
+     * @param {Function} keysFunc The function to get the keys of `object`.
+     * @returns {Object} Returns `object`.
+     */
+    var baseFor = createBaseFor();
+
+    /**
+     * This function is like `baseFor` except that it iterates over properties
+     * in the opposite order.
+     *
+     * @private
+     * @param {Object} object The object to iterate over.
+     * @param {Function} iteratee The function invoked per iteration.
+     * @param {Function} keysFunc The function to get the keys of `object`.
+     * @returns {Object} Returns `object`.
+     */
+    var baseForRight = createBaseFor(true);
+
+    /**
+     * The base implementation of `_.forOwn` without support for iteratee shorthands.
+     *
+     * @private
+     * @param {Object} object The object to iterate over.
+     * @param {Function} iteratee The function invoked per iteration.
+     * @returns {Object} Returns `object`.
+     */
+    function baseForOwn(object, iteratee) {
+      return object && baseFor(object, iteratee, keys);
+    }
+
+    /**
+     * The base implementation of `_.forOwnRight` without support for iteratee shorthands.
+     *
+     * @private
+     * @param {Object} object The object to iterate over.
+     * @param {Function} iteratee The function invoked per iteration.
+     * @returns {Object} Returns `object`.
+     */
+    function baseForOwnRight(object, iteratee) {
+      return object && baseForRight(object, iteratee, keys);
+    }
+
+    /**
+     * The base implementation of `_.functions` which creates an array of
+     * `object` function property names filtered from `props`.
+     *
+     * @private
+     * @param {Object} object The object to inspect.
+     * @param {Array} props The property names to filter.
+     * @returns {Array} Returns the function names.
+     */
+    function baseFunctions(object, props) {
+      return arrayFilter(props, function(key) {
+        return isFunction(object[key]);
+      });
+    }
+
+    /**
+     * The base implementation of `_.get` without support for default values.
+     *
+     * @private
+     * @param {Object} object The object to query.
+     * @param {Array|string} path The path of the property to get.
+     * @returns {*} Returns the resolved value.
+     */
+    function baseGet(object, path) {
+      path = castPath(path, object);
+
+      var index = 0,
+          length = path.length;
+
+      while (object != null && index < length) {
+        object = object[toKey(path[index++])];
+      }
+      return (index && index == length) ? object : undefined;
+    }
+
+    /**
+     * The base implementation of `getAllKeys` and `getAllKeysIn` which uses
+     * `keysFunc` and `symbolsFunc` to get the enumerable property names and
+     * symbols of `object`.
+     *
+     * @private
+     * @param {Object} object The object to query.
+     * @param {Function} keysFunc The function to get the keys of `object`.
+     * @param {Function} symbolsFunc The function to get the symbols of `object`.
+     * @returns {Array} Returns the array of property names and symbols.
+     */
+    function baseGetAllKeys(object, keysFunc, symbolsFunc) {
+      var result = keysFunc(object);
+      return isArray(object) ? result : arrayPush(result, symbolsFunc(object));
+    }
+
+    /**
+     * The base implementation of `getTag` without fallbacks for buggy environments.
+     *
+     * @private
+     * @param {*} value The value to query.
+     * @returns {string} Returns the `toStringTag`.
+     */
+    function baseGetTag(value) {
+      if (value == null) {
+        return value === undefined ? undefinedTag : nullTag;
+      }
+      return (symToStringTag && symToStringTag in Object(value))
+        ? getRawTag(value)
+        : objectToString(value);
+    }
+
+    /**
+     * The base implementation of `_.gt` which doesn't coerce arguments.
+     *
+     * @private
+     * @param {*} value The value to compare.
+     * @param {*} other The other value to compare.
+     * @returns {boolean} Returns `true` if `value` is greater than `other`,
+     *  else `false`.
+     */
+    function baseGt(value, other) {
+      return value > other;
+    }
+
+    /**
+     * The base implementation of `_.has` without support for deep paths.
+     *
+     * @private
+     * @param {Object} [object] The object to query.
+     * @param {Array|string} key The key to check.
+     * @returns {boolean} Returns `true` if `key` exists, else `false`.
+     */
+    function baseHas(object, key) {
+      return object != null && hasOwnProperty.call(object, key);
+    }
+
+    /**
+     * The base implementation of `_.hasIn` without support for deep paths.
+     *
+     * @private
+     * @param {Object} [object] The object to query.
+     * @param {Array|string} key The key to check.
+     * @returns {boolean} Returns `true` if `key` exists, else `false`.
+     */
+    function baseHasIn(object, key) {
+      return object != null && key in Object(object);
+    }
+
+    /**
+     * The base implementation of `_.inRange` which doesn't coerce arguments.
+     *
+     * @private
+     * @param {number} number The number to check.
+     * @param {number} start The start of the range.
+     * @param {number} end The end of the range.
+     * @returns {boolean} Returns `true` if `number` is in the range, else `false`.
+     */
+    function baseInRange(number, start, end) {
+      return number >= nativeMin(start, end) && number < nativeMax(start, end);
+    }
+
+    /**
+     * The base implementation of methods like `_.intersection`, without support
+     * for iteratee shorthands, that accepts an array of arrays to inspect.
+     *
+     * @private
+     * @param {Array} arrays The arrays to inspect.
+     * @param {Function} [iteratee] The iteratee invoked per element.
+     * @param {Function} [comparator] The comparator invoked per element.
+     * @returns {Array} Returns the new array of shared values.
+     */
+    function baseIntersection(arrays, iteratee, comparator) {
+      var includes = comparator ? arrayIncludesWith : arrayIncludes,
+          length = arrays[0].length,
+          othLength = arrays.length,
+          othIndex = othLength,
+          caches = Array(othLength),
+          maxLength = Infinity,
+          result = [];
+
+      while (othIndex--) {
+        var array = arrays[othIndex];
+        if (othIndex && iteratee) {
+          array = arrayMap(array, baseUnary(iteratee));
+        }
+        maxLength = nativeMin(array.length, maxLength);
+        caches[othIndex] = !comparator && (iteratee || (length >= 120 && array.length >= 120))
+          ? new SetCache(othIndex && array)
+          : undefined;
+      }
+      array = arrays[0];
+
+      var index = -1,
+          seen = caches[0];
+
+      outer:
+      while (++index < length && result.length < maxLength) {
+        var value = array[index],
+            computed = iteratee ? iteratee(value) : value;
+
+        value = (comparator || value !== 0) ? value : 0;
+        if (!(seen
+              ? cacheHas(seen, computed)
+              : includes(result, computed, comparator)
+            )) {
+          othIndex = othLength;
+          while (--othIndex) {
+            var cache = caches[othIndex];
+            if (!(cache
+                  ? cacheHas(cache, computed)
+                  : includes(arrays[othIndex], computed, comparator))
+                ) {
+              continue outer;
+            }
+          }
+          if (seen) {
+            seen.push(computed);
+          }
+          result.push(value);
+        }
+      }
+      return result;
+    }
+
+    /**
+     * The base implementation of `_.invert` and `_.invertBy` which inverts
+     * `object` with values transformed by `iteratee` and set by `setter`.
+     *
+     * @private
+     * @param {Object} object The object to iterate over.
+     * @param {Function} setter The function to set `accumulator` values.
+     * @param {Function} iteratee The iteratee to transform values.
+     * @param {Object} accumulator The initial inverted object.
+     * @returns {Function} Returns `accumulator`.
+     */
+    function baseInverter(object, setter, iteratee, accumulator) {
+      baseForOwn(object, function(value, key, object) {
+        setter(accumulator, iteratee(value), key, object);
+      });
+      return accumulator;
+    }
+
+    /**
+     * The base implementation of `_.invoke` without support for individual
+     * method arguments.
+     *
+     * @private
+     * @param {Object} object The object to query.
+     * @param {Array|string} path The path of the method to invoke.
+     * @param {Array} args The arguments to invoke the method with.
+     * @returns {*} Returns the result of the invoked method.
+     */
+    function baseInvoke(object, path, args) {
+      path = castPath(path, object);
+      object = parent(object, path);
+      var func = object == null ? object : object[toKey(last(path))];
+      return func == null ? undefined : apply(func, object, args);
+    }
+
+    /**
+     * The base implementation of `_.isArguments`.
+     *
+     * @private
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is an `arguments` object,
+     */
+    function baseIsArguments(value) {
+      return isObjectLike(value) && baseGetTag(value) == argsTag;
+    }
+
+    /**
+     * The base implementation of `_.isArrayBuffer` without Node.js optimizations.
+     *
+     * @private
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is an array buffer, else `false`.
+     */
+    function baseIsArrayBuffer(value) {
+      return isObjectLike(value) && baseGetTag(value) == arrayBufferTag;
+    }
+
+    /**
+     * The base implementation of `_.isDate` without Node.js optimizations.
+     *
+     * @private
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a date object, else `false`.
+     */
+    function baseIsDate(value) {
+      return isObjectLike(value) && baseGetTag(value) == dateTag;
+    }
+
+    /**
+     * The base implementation of `_.isEqual` which supports partial comparisons
+     * and tracks traversed objects.
+     *
+     * @private
+     * @param {*} value The value to compare.
+     * @param {*} other The other value to compare.
+     * @param {boolean} bitmask The bitmask flags.
+     *  1 - Unordered comparison
+     *  2 - Partial comparison
+     * @param {Function} [customizer] The function to customize comparisons.
+     * @param {Object} [stack] Tracks traversed `value` and `other` objects.
+     * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
+     */
+    function baseIsEqual(value, other, bitmask, customizer, stack) {
+      if (value === other) {
+        return true;
+      }
+      if (value == null || other == null || (!isObjectLike(value) && !isObjectLike(other))) {
+        return value !== value && other !== other;
+      }
+      return baseIsEqualDeep(value, other, bitmask, customizer, baseIsEqual, stack);
+    }
+
+    /**
+     * A specialized version of `baseIsEqual` for arrays and objects which performs
+     * deep comparisons and tracks traversed objects enabling objects with circular
+     * references to be compared.
+     *
+     * @private
+     * @param {Object} object The object to compare.
+     * @param {Object} other The other object to compare.
+     * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
+     * @param {Function} customizer The function to customize comparisons.
+     * @param {Function} equalFunc The function to determine equivalents of values.
+     * @param {Object} [stack] Tracks traversed `object` and `other` objects.
+     * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
+     */
+    function baseIsEqualDeep(object, other, bitmask, customizer, equalFunc, stack) {
+      var objIsArr = isArray(object),
+          othIsArr = isArray(other),
+          objTag = objIsArr ? arrayTag : getTag(object),
+          othTag = othIsArr ? arrayTag : getTag(other);
+
+      objTag = objTag == argsTag ? objectTag : objTag;
+      othTag = othTag == argsTag ? objectTag : othTag;
+
+      var objIsObj = objTag == objectTag,
+          othIsObj = othTag == objectTag,
+          isSameTag = objTag == othTag;
+
+      if (isSameTag && isBuffer(object)) {
+        if (!isBuffer(other)) {
+          return false;
+        }
+        objIsArr = true;
+        objIsObj = false;
+      }
+      if (isSameTag && !objIsObj) {
+        stack || (stack = new Stack);
+        return (objIsArr || isTypedArray(object))
+          ? equalArrays(object, other, bitmask, customizer, equalFunc, stack)
+          : equalByTag(object, other, objTag, bitmask, customizer, equalFunc, stack);
+      }
+      if (!(bitmask & COMPARE_PARTIAL_FLAG)) {
+        var objIsWrapped = objIsObj && hasOwnProperty.call(object, '__wrapped__'),
+            othIsWrapped = othIsObj && hasOwnProperty.call(other, '__wrapped__');
+
+        if (objIsWrapped || othIsWrapped) {
+          var objUnwrapped = objIsWrapped ? object.value() : object,
+              othUnwrapped = othIsWrapped ? other.value() : other;
+
+          stack || (stack = new Stack);
+          return equalFunc(objUnwrapped, othUnwrapped, bitmask, customizer, stack);
+        }
+      }
+      if (!isSameTag) {
+        return false;
+      }
+      stack || (stack = new Stack);
+      return equalObjects(object, other, bitmask, customizer, equalFunc, stack);
+    }
+
+    /**
+     * The base implementation of `_.isMap` without Node.js optimizations.
+     *
+     * @private
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a map, else `false`.
+     */
+    function baseIsMap(value) {
+      return isObjectLike(value) && getTag(value) == mapTag;
+    }
+
+    /**
+     * The base implementation of `_.isMatch` without support for iteratee shorthands.
+     *
+     * @private
+     * @param {Object} object The object to inspect.
+     * @param {Object} source The object of property values to match.
+     * @param {Array} matchData The property names, values, and compare flags to match.
+     * @param {Function} [customizer] The function to customize comparisons.
+     * @returns {boolean} Returns `true` if `object` is a match, else `false`.
+     */
+    function baseIsMatch(object, source, matchData, customizer) {
+      var index = matchData.length,
+          length = index,
+          noCustomizer = !customizer;
+
+      if (object == null) {
+        return !length;
+      }
+      object = Object(object);
+      while (index--) {
+        var data = matchData[index];
+        if ((noCustomizer && data[2])
+              ? data[1] !== object[data[0]]
+              : !(data[0] in object)
+            ) {
+          return false;
+        }
+      }
+      while (++index < length) {
+        data = matchData[index];
+        var key = data[0],
+            objValue = object[key],
+            srcValue = data[1];
+
+        if (noCustomizer && data[2]) {
+          if (objValue === undefined && !(key in object)) {
+            return false;
+          }
+        } else {
+          var stack = new Stack;
+          if (customizer) {
+            var result = customizer(objValue, srcValue, key, object, source, stack);
+          }
+          if (!(result === undefined
+                ? baseIsEqual(srcValue, objValue, COMPARE_PARTIAL_FLAG | COMPARE_UNORDERED_FLAG, customizer, stack)
+                : result
+              )) {
+            return false;
+          }
+        }
+      }
+      return true;
+    }
+
+    /**
+     * The base implementation of `_.isNative` without bad shim checks.
+     *
+     * @private
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a native function,
+     *  else `false`.
+     */
+    function baseIsNative(value) {
+      if (!isObject(value) || isMasked(value)) {
+        return false;
+      }
+      var pattern = isFunction(value) ? reIsNative : reIsHostCtor;
+      return pattern.test(toSource(value));
+    }
+
+    /**
+     * The base implementation of `_.isRegExp` without Node.js optimizations.
+     *
+     * @private
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a regexp, else `false`.
+     */
+    function baseIsRegExp(value) {
+      return isObjectLike(value) && baseGetTag(value) == regexpTag;
+    }
+
+    /**
+     * The base implementation of `_.isSet` without Node.js optimizations.
+     *
+     * @private
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a set, else `false`.
+     */
+    function baseIsSet(value) {
+      return isObjectLike(value) && getTag(value) == setTag;
+    }
+
+    /**
+     * The base implementation of `_.isTypedArray` without Node.js optimizations.
+     *
+     * @private
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a typed array, else `false`.
+     */
+    function baseIsTypedArray(value) {
+      return isObjectLike(value) &&
+        isLength(value.length) && !!typedArrayTags[baseGetTag(value)];
+    }
+
+    /**
+     * The base implementation of `_.iteratee`.
+     *
+     * @private
+     * @param {*} [value=_.identity] The value to convert to an iteratee.
+     * @returns {Function} Returns the iteratee.
+     */
+    function baseIteratee(value) {
+      // Don't store the `typeof` result in a variable to avoid a JIT bug in Safari 9.
+      // See https://bugs.webkit.org/show_bug.cgi?id=156034 for more details.
+      if (typeof value == 'function') {
+        return value;
+      }
+      if (value == null) {
+        return identity;
+      }
+      if (typeof value == 'object') {
+        return isArray(value)
+          ? baseMatchesProperty(value[0], value[1])
+          : baseMatches(value);
+      }
+      return property(value);
+    }
+
+    /**
+     * The base implementation of `_.keys` which doesn't treat sparse arrays as dense.
+     *
+     * @private
+     * @param {Object} object The object to query.
+     * @returns {Array} Returns the array of property names.
+     */
+    function baseKeys(object) {
+      if (!isPrototype(object)) {
+        return nativeKeys(object);
+      }
+      var result = [];
+      for (var key in Object(object)) {
+        if (hasOwnProperty.call(object, key) && key != 'constructor') {
+          result.push(key);
+        }
+      }
+      return result;
+    }
+
+    /**
+     * The base implementation of `_.keysIn` which doesn't treat sparse arrays as dense.
+     *
+     * @private
+     * @param {Object} object The object to query.
+     * @returns {Array} Returns the array of property names.
+     */
+    function baseKeysIn(object) {
+      if (!isObject(object)) {
+        return nativeKeysIn(object);
+      }
+      var isProto = isPrototype(object),
+          result = [];
+
+      for (var key in object) {
+        if (!(key == 'constructor' && (isProto || !hasOwnProperty.call(object, key)))) {
+          result.push(key);
+        }
+      }
+      return result;
+    }
+
+    /**
+     * The base implementation of `_.lt` which doesn't coerce arguments.
+     *
+     * @private
+     * @param {*} value The value to compare.
+     * @param {*} other The other value to compare.
+     * @returns {boolean} Returns `true` if `value` is less than `other`,
+     *  else `false`.
+     */
+    function baseLt(value, other) {
+      return value < other;
+    }
+
+    /**
+     * The base implementation of `_.map` without support for iteratee shorthands.
+     *
+     * @private
+     * @param {Array|Object} collection The collection to iterate over.
+     * @param {Function} iteratee The function invoked per iteration.
+     * @returns {Array} Returns the new mapped array.
+     */
+    function baseMap(collection, iteratee) {
+      var index = -1,
+          result = isArrayLike(collection) ? Array(collection.length) : [];
+
+      baseEach(collection, function(value, key, collection) {
+        result[++index] = iteratee(value, key, collection);
+      });
+      return result;
+    }
+
+    /**
+     * The base implementation of `_.matches` which doesn't clone `source`.
+     *
+     * @private
+     * @param {Object} source The object of property values to match.
+     * @returns {Function} Returns the new spec function.
+     */
+    function baseMatches(source) {
+      var matchData = getMatchData(source);
+      if (matchData.length == 1 && matchData[0][2]) {
+        return matchesStrictComparable(matchData[0][0], matchData[0][1]);
+      }
+      return function(object) {
+        return object === source || baseIsMatch(object, source, matchData);
+      };
+    }
+
+    /**
+     * The base implementation of `_.matchesProperty` which doesn't clone `srcValue`.
+     *
+     * @private
+     * @param {string} path The path of the property to get.
+     * @param {*} srcValue The value to match.
+     * @returns {Function} Returns the new spec function.
+     */
+    function baseMatchesProperty(path, srcValue) {
+      if (isKey(path) && isStrictComparable(srcValue)) {
+        return matchesStrictComparable(toKey(path), srcValue);
+      }
+      return function(object) {
+        var objValue = get(object, path);
+        return (objValue === undefined && objValue === srcValue)
+          ? hasIn(object, path)
+          : baseIsEqual(srcValue, objValue, COMPARE_PARTIAL_FLAG | COMPARE_UNORDERED_FLAG);
+      };
+    }
+
+    /**
+     * The base implementation of `_.merge` without support for multiple sources.
+     *
+     * @private
+     * @param {Object} object The destination object.
+     * @param {Object} source The source object.
+     * @param {number} srcIndex The index of `source`.
+     * @param {Function} [customizer] The function to customize merged values.
+     * @param {Object} [stack] Tracks traversed source values and their merged
+     *  counterparts.
+     */
+    function baseMerge(object, source, srcIndex, customizer, stack) {
+      if (object === source) {
+        return;
+      }
+      baseFor(source, function(srcValue, key) {
+        stack || (stack = new Stack);
+        if (isObject(srcValue)) {
+          baseMergeDeep(object, source, key, srcIndex, baseMerge, customizer, stack);
+        }
+        else {
+          var newValue = customizer
+            ? customizer(safeGet(object, key), srcValue, (key + ''), object, source, stack)
+            : undefined;
+
+          if (newValue === undefined) {
+            newValue = srcValue;
+          }
+          assignMergeValue(object, key, newValue);
+        }
+      }, keysIn);
+    }
+
+    /**
+     * A specialized version of `baseMerge` for arrays and objects which performs
+     * deep merges and tracks traversed objects enabling objects with circular
+     * references to be merged.
+     *
+     * @private
+     * @param {Object} object The destination object.
+     * @param {Object} source The source object.
+     * @param {string} key The key of the value to merge.
+     * @param {number} srcIndex The index of `source`.
+     * @param {Function} mergeFunc The function to merge values.
+     * @param {Function} [customizer] The function to customize assigned values.
+     * @param {Object} [stack] Tracks traversed source values and their merged
+     *  counterparts.
+     */
+    function baseMergeDeep(object, source, key, srcIndex, mergeFunc, customizer, stack) {
+      var objValue = safeGet(object, key),
+          srcValue = safeGet(source, key),
+          stacked = stack.get(srcValue);
+
+      if (stacked) {
+        assignMergeValue(object, key, stacked);
+        return;
+      }
+      var newValue = customizer
+        ? customizer(objValue, srcValue, (key + ''), object, source, stack)
+        : undefined;
+
+      var isCommon = newValue === undefined;
+
+      if (isCommon) {
+        var isArr = isArray(srcValue),
+            isBuff = !isArr && isBuffer(srcValue),
+            isTyped = !isArr && !isBuff && isTypedArray(srcValue);
+
+        newValue = srcValue;
+        if (isArr || isBuff || isTyped) {
+          if (isArray(objValue)) {
+            newValue = objValue;
+          }
+          else if (isArrayLikeObject(objValue)) {
+            newValue = copyArray(objValue);
+          }
+          else if (isBuff) {
+            isCommon = false;
+            newValue = cloneBuffer(srcValue, true);
+          }
+          else if (isTyped) {
+            isCommon = false;
+            newValue = cloneTypedArray(srcValue, true);
+          }
+          else {
+            newValue = [];
+          }
+        }
+        else if (isPlainObject(srcValue) || isArguments(srcValue)) {
+          newValue = objValue;
+          if (isArguments(objValue)) {
+            newValue = toPlainObject(objValue);
+          }
+          else if (!isObject(objValue) || isFunction(objValue)) {
+            newValue = initCloneObject(srcValue);
+          }
+        }
+        else {
+          isCommon = false;
+        }
+      }
+      if (isCommon) {
+        // Recursively merge objects and arrays (susceptible to call stack limits).
+        stack.set(srcValue, newValue);
+        mergeFunc(newValue, srcValue, srcIndex, customizer, stack);
+        stack['delete'](srcValue);
+      }
+      assignMergeValue(object, key, newValue);
+    }
+
+    /**
+     * The base implementation of `_.nth` which doesn't coerce arguments.
+     *
+     * @private
+     * @param {Array} array The array to query.
+     * @param {number} n The index of the element to return.
+     * @returns {*} Returns the nth element of `array`.
+     */
+    function baseNth(array, n) {
+      var length = array.length;
+      if (!length) {
+        return;
+      }
+      n += n < 0 ? length : 0;
+      return isIndex(n, length) ? array[n] : undefined;
+    }
+
+    /**
+     * The base implementation of `_.orderBy` without param guards.
+     *
+     * @private
+     * @param {Array|Object} collection The collection to iterate over.
+     * @param {Function[]|Object[]|string[]} iteratees The iteratees to sort by.
+     * @param {string[]} orders The sort orders of `iteratees`.
+     * @returns {Array} Returns the new sorted array.
+     */
+    function baseOrderBy(collection, iteratees, orders) {
+      if (iteratees.length) {
+        iteratees = arrayMap(iteratees, function(iteratee) {
+          if (isArray(iteratee)) {
+            return function(value) {
+              return baseGet(value, iteratee.length === 1 ? iteratee[0] : iteratee);
+            }
+          }
+          return iteratee;
+        });
+      } else {
+        iteratees = [identity];
+      }
+
+      var index = -1;
+      iteratees = arrayMap(iteratees, baseUnary(getIteratee()));
+
+      var result = baseMap(collection, function(value, key, collection) {
+        var criteria = arrayMap(iteratees, function(iteratee) {
+          return iteratee(value);
+        });
+        return { 'criteria': criteria, 'index': ++index, 'value': value };
+      });
+
+      return baseSortBy(result, function(object, other) {
+        return compareMultiple(object, other, orders);
+      });
+    }
+
+    /**
+     * The base implementation of `_.pick` without support for individual
+     * property identifiers.
+     *
+     * @private
+     * @param {Object} object The source object.
+     * @param {string[]} paths The property paths to pick.
+     * @returns {Object} Returns the new object.
+     */
+    function basePick(object, paths) {
+      return basePickBy(object, paths, function(value, path) {
+        return hasIn(object, path);
+      });
+    }
+
+    /**
+     * The base implementation of  `_.pickBy` without support for iteratee shorthands.
+     *
+     * @private
+     * @param {Object} object The source object.
+     * @param {string[]} paths The property paths to pick.
+     * @param {Function} predicate The function invoked per property.
+     * @returns {Object} Returns the new object.
+     */
+    function basePickBy(object, paths, predicate) {
+      var index = -1,
+          length = paths.length,
+          result = {};
+
+      while (++index < length) {
+        var path = paths[index],
+            value = baseGet(object, path);
+
+        if (predicate(value, path)) {
+          baseSet(result, castPath(path, object), value);
+        }
+      }
+      return result;
+    }
+
+    /**
+     * A specialized version of `baseProperty` which supports deep paths.
+     *
+     * @private
+     * @param {Array|string} path The path of the property to get.
+     * @returns {Function} Returns the new accessor function.
+     */
+    function basePropertyDeep(path) {
+      return function(object) {
+        return baseGet(object, path);
+      };
+    }
+
+    /**
+     * The base implementation of `_.pullAllBy` without support for iteratee
+     * shorthands.
+     *
+     * @private
+     * @param {Array} array The array to modify.
+     * @param {Array} values The values to remove.
+     * @param {Function} [iteratee] The iteratee invoked per element.
+     * @param {Function} [comparator] The comparator invoked per element.
+     * @returns {Array} Returns `array`.
+     */
+    function basePullAll(array, values, iteratee, comparator) {
+      var indexOf = comparator ? baseIndexOfWith : baseIndexOf,
+          index = -1,
+          length = values.length,
+          seen = array;
+
+      if (array === values) {
+        values = copyArray(values);
+      }
+      if (iteratee) {
+        seen = arrayMap(array, baseUnary(iteratee));
+      }
+      while (++index < length) {
+        var fromIndex = 0,
+            value = values[index],
+            computed = iteratee ? iteratee(value) : value;
+
+        while ((fromIndex = indexOf(seen, computed, fromIndex, comparator)) > -1) {
+          if (seen !== array) {
+            splice.call(seen, fromIndex, 1);
+          }
+          splice.call(array, fromIndex, 1);
+        }
+      }
+      return array;
+    }
+
+    /**
+     * The base implementation of `_.pullAt` without support for individual
+     * indexes or capturing the removed elements.
+     *
+     * @private
+     * @param {Array} array The array to modify.
+     * @param {number[]} indexes The indexes of elements to remove.
+     * @returns {Array} Returns `array`.
+     */
+    function basePullAt(array, indexes) {
+      var length = array ? indexes.length : 0,
+          lastIndex = length - 1;
+
+      while (length--) {
+        var index = indexes[length];
+        if (length == lastIndex || index !== previous) {
+          var previous = index;
+          if (isIndex(index)) {
+            splice.call(array, index, 1);
+          } else {
+            baseUnset(array, index);
+          }
+        }
+      }
+      return array;
+    }
+
+    /**
+     * The base implementation of `_.random` without support for returning
+     * floating-point numbers.
+     *
+     * @private
+     * @param {number} lower The lower bound.
+     * @param {number} upper The upper bound.
+     * @returns {number} Returns the random number.
+     */
+    function baseRandom(lower, upper) {
+      return lower + nativeFloor(nativeRandom() * (upper - lower + 1));
+    }
+
+    /**
+     * The base implementation of `_.range` and `_.rangeRight` which doesn't
+     * coerce arguments.
+     *
+     * @private
+     * @param {number} start The start of the range.
+     * @param {number} end The end of the range.
+     * @param {number} step The value to increment or decrement by.
+     * @param {boolean} [fromRight] Specify iterating from right to left.
+     * @returns {Array} Returns the range of numbers.
+     */
+    function baseRange(start, end, step, fromRight) {
+      var index = -1,
+          length = nativeMax(nativeCeil((end - start) / (step || 1)), 0),
+          result = Array(length);
+
+      while (length--) {
+        result[fromRight ? length : ++index] = start;
+        start += step;
+      }
+      return result;
+    }
+
+    /**
+     * The base implementation of `_.repeat` which doesn't coerce arguments.
+     *
+     * @private
+     * @param {string} string The string to repeat.
+     * @param {number} n The number of times to repeat the string.
+     * @returns {string} Returns the repeated string.
+     */
+    function baseRepeat(string, n) {
+      var result = '';
+      if (!string || n < 1 || n > MAX_SAFE_INTEGER) {
+        return result;
+      }
+      // Leverage the exponentiation by squaring algorithm for a faster repeat.
+      // See https://en.wikipedia.org/wiki/Exponentiation_by_squaring for more details.
+      do {
+        if (n % 2) {
+          result += string;
+        }
+        n = nativeFloor(n / 2);
+        if (n) {
+          string += string;
+        }
+      } while (n);
+
+      return result;
+    }
+
+    /**
+     * The base implementation of `_.rest` which doesn't validate or coerce arguments.
+     *
+     * @private
+     * @param {Function} func The function to apply a rest parameter to.
+     * @param {number} [start=func.length-1] The start position of the rest parameter.
+     * @returns {Function} Returns the new function.
+     */
+    function baseRest(func, start) {
+      return setToString(overRest(func, start, identity), func + '');
+    }
+
+    /**
+     * The base implementation of `_.sample`.
+     *
+     * @private
+     * @param {Array|Object} collection The collection to sample.
+     * @returns {*} Returns the random element.
+     */
+    function baseSample(collection) {
+      return arraySample(values(collection));
+    }
+
+    /**
+     * The base implementation of `_.sampleSize` without param guards.
+     *
+     * @private
+     * @param {Array|Object} collection The collection to sample.
+     * @param {number} n The number of elements to sample.
+     * @returns {Array} Returns the random elements.
+     */
+    function baseSampleSize(collection, n) {
+      var array = values(collection);
+      return shuffleSelf(array, baseClamp(n, 0, array.length));
+    }
+
+    /**
+     * The base implementation of `_.set`.
+     *
+     * @private
+     * @param {Object} object The object to modify.
+     * @param {Array|string} path The path of the property to set.
+     * @param {*} value The value to set.
+     * @param {Function} [customizer] The function to customize path creation.
+     * @returns {Object} Returns `object`.
+     */
+    function baseSet(object, path, value, customizer) {
+      if (!isObject(object)) {
+        return object;
+      }
+      path = castPath(path, object);
+
+      var index = -1,
+          length = path.length,
+          lastIndex = length - 1,
+          nested = object;
+
+      while (nested != null && ++index < length) {
+        var key = toKey(path[index]),
+            newValue = value;
+
+        if (key === '__proto__' || key === 'constructor' || key === 'prototype') {
+          return object;
+        }
+
+        if (index != lastIndex) {
+          var objValue = nested[key];
+          newValue = customizer ? customizer(objValue, key, nested) : undefined;
+          if (newValue === undefined) {
+            newValue = isObject(objValue)
+              ? objValue
+              : (isIndex(path[index + 1]) ? [] : {});
+          }
+        }
+        assignValue(nested, key, newValue);
+        nested = nested[key];
+      }
+      return object;
+    }
+
+    /**
+     * The base implementation of `setData` without support for hot loop shorting.
+     *
+     * @private
+     * @param {Function} func The function to associate metadata with.
+     * @param {*} data The metadata.
+     * @returns {Function} Returns `func`.
+     */
+    var baseSetData = !metaMap ? identity : function(func, data) {
+      metaMap.set(func, data);
+      return func;
+    };
+
+    /**
+     * The base implementation of `setToString` without support for hot loop shorting.
+     *
+     * @private
+     * @param {Function} func The function to modify.
+     * @param {Function} string The `toString` result.
+     * @returns {Function} Returns `func`.
+     */
+    var baseSetToString = !defineProperty ? identity : function(func, string) {
+      return defineProperty(func, 'toString', {
+        'configurable': true,
+        'enumerable': false,
+        'value': constant(string),
+        'writable': true
+      });
+    };
+
+    /**
+     * The base implementation of `_.shuffle`.
+     *
+     * @private
+     * @param {Array|Object} collection The collection to shuffle.
+     * @returns {Array} Returns the new shuffled array.
+     */
+    function baseShuffle(collection) {
+      return shuffleSelf(values(collection));
+    }
+
+    /**
+     * The base implementation of `_.slice` without an iteratee call guard.
+     *
+     * @private
+     * @param {Array} array The array to slice.
+     * @param {number} [start=0] The start position.
+     * @param {number} [end=array.length] The end position.
+     * @returns {Array} Returns the slice of `array`.
+     */
+    function baseSlice(array, start, end) {
+      var index = -1,
+          length = array.length;
+
+      if (start < 0) {
+        start = -start > length ? 0 : (length + start);
+      }
+      end = end > length ? length : end;
+      if (end < 0) {
+        end += length;
+      }
+      length = start > end ? 0 : ((end - start) >>> 0);
+      start >>>= 0;
+
+      var result = Array(length);
+      while (++index < length) {
+        result[index] = array[index + start];
+      }
+      return result;
+    }
+
+    /**
+     * The base implementation of `_.some` without support for iteratee shorthands.
+     *
+     * @private
+     * @param {Array|Object} collection The collection to iterate over.
+     * @param {Function} predicate The function invoked per iteration.
+     * @returns {boolean} Returns `true` if any element passes the predicate check,
+     *  else `false`.
+     */
+    function baseSome(collection, predicate) {
+      var result;
+
+      baseEach(collection, function(value, index, collection) {
+        result = predicate(value, index, collection);
+        return !result;
+      });
+      return !!result;
+    }
+
+    /**
+     * The base implementation of `_.sortedIndex` and `_.sortedLastIndex` which
+     * performs a binary search of `array` to determine the index at which `value`
+     * should be inserted into `array` in order to maintain its sort order.
+     *
+     * @private
+     * @param {Array} array The sorted array to inspect.
+     * @param {*} value The value to evaluate.
+     * @param {boolean} [retHighest] Specify returning the highest qualified index.
+     * @returns {number} Returns the index at which `value` should be inserted
+     *  into `array`.
+     */
+    function baseSortedIndex(array, value, retHighest) {
+      var low = 0,
+          high = array == null ? low : array.length;
+
+      if (typeof value == 'number' && value === value && high <= HALF_MAX_ARRAY_LENGTH) {
+        while (low < high) {
+          var mid = (low + high) >>> 1,
+              computed = array[mid];
+
+          if (computed !== null && !isSymbol(computed) &&
+              (retHighest ? (computed <= value) : (computed < value))) {
+            low = mid + 1;
+          } else {
+            high = mid;
+          }
+        }
+        return high;
+      }
+      return baseSortedIndexBy(array, value, identity, retHighest);
+    }
+
+    /**
+     * The base implementation of `_.sortedIndexBy` and `_.sortedLastIndexBy`
+     * which invokes `iteratee` for `value` and each element of `array` to compute
+     * their sort ranking. The iteratee is invoked with one argument; (value).
+     *
+     * @private
+     * @param {Array} array The sorted array to inspect.
+     * @param {*} value The value to evaluate.
+     * @param {Function} iteratee The iteratee invoked per element.
+     * @param {boolean} [retHighest] Specify returning the highest qualified index.
+     * @returns {number} Returns the index at which `value` should be inserted
+     *  into `array`.
+     */
+    function baseSortedIndexBy(array, value, iteratee, retHighest) {
+      var low = 0,
+          high = array == null ? 0 : array.length;
+      if (high === 0) {
+        return 0;
+      }
+
+      value = iteratee(value);
+      var valIsNaN = value !== value,
+          valIsNull = value === null,
+          valIsSymbol = isSymbol(value),
+          valIsUndefined = value === undefined;
+
+      while (low < high) {
+        var mid = nativeFloor((low + high) / 2),
+            computed = iteratee(array[mid]),
+            othIsDefined = computed !== undefined,
+            othIsNull = computed === null,
+            othIsReflexive = computed === computed,
+            othIsSymbol = isSymbol(computed);
+
+        if (valIsNaN) {
+          var setLow = retHighest || othIsReflexive;
+        } else if (valIsUndefined) {
+          setLow = othIsReflexive && (retHighest || othIsDefined);
+        } else if (valIsNull) {
+          setLow = othIsReflexive && othIsDefined && (retHighest || !othIsNull);
+        } else if (valIsSymbol) {
+          setLow = othIsReflexive && othIsDefined && !othIsNull && (retHighest || !othIsSymbol);
+        } else if (othIsNull || othIsSymbol) {
+          setLow = false;
+        } else {
+          setLow = retHighest ? (computed <= value) : (computed < value);
+        }
+        if (setLow) {
+          low = mid + 1;
+        } else {
+          high = mid;
+        }
+      }
+      return nativeMin(high, MAX_ARRAY_INDEX);
+    }
+
+    /**
+     * The base implementation of `_.sortedUniq` and `_.sortedUniqBy` without
+     * support for iteratee shorthands.
+     *
+     * @private
+     * @param {Array} array The array to inspect.
+     * @param {Function} [iteratee] The iteratee invoked per element.
+     * @returns {Array} Returns the new duplicate free array.
+     */
+    function baseSortedUniq(array, iteratee) {
+      var index = -1,
+          length = array.length,
+          resIndex = 0,
+          result = [];
+
+      while (++index < length) {
+        var value = array[index],
+            computed = iteratee ? iteratee(value) : value;
+
+        if (!index || !eq(computed, seen)) {
+          var seen = computed;
+          result[resIndex++] = value === 0 ? 0 : value;
+        }
+      }
+      return result;
+    }
+
+    /**
+     * The base implementation of `_.toNumber` which doesn't ensure correct
+     * conversions of binary, hexadecimal, or octal string values.
+     *
+     * @private
+     * @param {*} value The value to process.
+     * @returns {number} Returns the number.
+     */
+    function baseToNumber(value) {
+      if (typeof value == 'number') {
+        return value;
+      }
+      if (isSymbol(value)) {
+        return NAN;
+      }
+      return +value;
+    }
+
+    /**
+     * The base implementation of `_.toString` which doesn't convert nullish
+     * values to empty strings.
+     *
+     * @private
+     * @param {*} value The value to process.
+     * @returns {string} Returns the string.
+     */
+    function baseToString(value) {
+      // Exit early for strings to avoid a performance hit in some environments.
+      if (typeof value == 'string') {
+        return value;
+      }
+      if (isArray(value)) {
+        // Recursively convert values (susceptible to call stack limits).
+        return arrayMap(value, baseToString) + '';
+      }
+      if (isSymbol(value)) {
+        return symbolToString ? symbolToString.call(value) : '';
+      }
+      var result = (value + '');
+      return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
+    }
+
+    /**
+     * The base implementation of `_.uniqBy` without support for iteratee shorthands.
+     *
+     * @private
+     * @param {Array} array The array to inspect.
+     * @param {Function} [iteratee] The iteratee invoked per element.
+     * @param {Function} [comparator] The comparator invoked per element.
+     * @returns {Array} Returns the new duplicate free array.
+     */
+    function baseUniq(array, iteratee, comparator) {
+      var index = -1,
+          includes = arrayIncludes,
+          length = array.length,
+          isCommon = true,
+          result = [],
+          seen = result;
+
+      if (comparator) {
+        isCommon = false;
+        includes = arrayIncludesWith;
+      }
+      else if (length >= LARGE_ARRAY_SIZE) {
+        var set = iteratee ? null : createSet(array);
+        if (set) {
+          return setToArray(set);
+        }
+        isCommon = false;
+        includes = cacheHas;
+        seen = new SetCache;
+      }
+      else {
+        seen = iteratee ? [] : result;
+      }
+      outer:
+      while (++index < length) {
+        var value = array[index],
+            computed = iteratee ? iteratee(value) : value;
+
+        value = (comparator || value !== 0) ? value : 0;
+        if (isCommon && computed === computed) {
+          var seenIndex = seen.length;
+          while (seenIndex--) {
+            if (seen[seenIndex] === computed) {
+              continue outer;
+            }
+          }
+          if (iteratee) {
+            seen.push(computed);
+          }
+          result.push(value);
+        }
+        else if (!includes(seen, computed, comparator)) {
+          if (seen !== result) {
+            seen.push(computed);
+          }
+          result.push(value);
+        }
+      }
+      return result;
+    }
+
+    /**
+     * The base implementation of `_.unset`.
+     *
+     * @private
+     * @param {Object} object The object to modify.
+     * @param {Array|string} path The property path to unset.
+     * @returns {boolean} Returns `true` if the property is deleted, else `false`.
+     */
+    function baseUnset(object, path) {
+      path = castPath(path, object);
+      object = parent(object, path);
+      return object == null || delete object[toKey(last(path))];
+    }
+
+    /**
+     * The base implementation of `_.update`.
+     *
+     * @private
+     * @param {Object} object The object to modify.
+     * @param {Array|string} path The path of the property to update.
+     * @param {Function} updater The function to produce the updated value.
+     * @param {Function} [customizer] The function to customize path creation.
+     * @returns {Object} Returns `object`.
+     */
+    function baseUpdate(object, path, updater, customizer) {
+      return baseSet(object, path, updater(baseGet(object, path)), customizer);
+    }
+
+    /**
+     * The base implementation of methods like `_.dropWhile` and `_.takeWhile`
+     * without support for iteratee shorthands.
+     *
+     * @private
+     * @param {Array} array The array to query.
+     * @param {Function} predicate The function invoked per iteration.
+     * @param {boolean} [isDrop] Specify dropping elements instead of taking them.
+     * @param {boolean} [fromRight] Specify iterating from right to left.
+     * @returns {Array} Returns the slice of `array`.
+     */
+    function baseWhile(array, predicate, isDrop, fromRight) {
+      var length = array.length,
+          index = fromRight ? length : -1;
+
+      while ((fromRight ? index-- : ++index < length) &&
+        predicate(array[index], index, array)) {}
+
+      return isDrop
+        ? baseSlice(array, (fromRight ? 0 : index), (fromRight ? index + 1 : length))
+        : baseSlice(array, (fromRight ? index + 1 : 0), (fromRight ? length : index));
+    }
+
+    /**
+     * The base implementation of `wrapperValue` which returns the result of
+     * performing a sequence of actions on the unwrapped `value`, where each
+     * successive action is supplied the return value of the previous.
+     *
+     * @private
+     * @param {*} value The unwrapped value.
+     * @param {Array} actions Actions to perform to resolve the unwrapped value.
+     * @returns {*} Returns the resolved value.
+     */
+    function baseWrapperValue(value, actions) {
+      var result = value;
+      if (result instanceof LazyWrapper) {
+        result = result.value();
+      }
+      return arrayReduce(actions, function(result, action) {
+        return action.func.apply(action.thisArg, arrayPush([result], action.args));
+      }, result);
+    }
+
+    /**
+     * The base implementation of methods like `_.xor`, without support for
+     * iteratee shorthands, that accepts an array of arrays to inspect.
+     *
+     * @private
+     * @param {Array} arrays The arrays to inspect.
+     * @param {Function} [iteratee] The iteratee invoked per element.
+     * @param {Function} [comparator] The comparator invoked per element.
+     * @returns {Array} Returns the new array of values.
+     */
+    function baseXor(arrays, iteratee, comparator) {
+      var length = arrays.length;
+      if (length < 2) {
+        return length ? baseUniq(arrays[0]) : [];
+      }
+      var index = -1,
+          result = Array(length);
+
+      while (++index < length) {
+        var array = arrays[index],
+            othIndex = -1;
+
+        while (++othIndex < length) {
+          if (othIndex != index) {
+            result[index] = baseDifference(result[index] || array, arrays[othIndex], iteratee, comparator);
+          }
+        }
+      }
+      return baseUniq(baseFlatten(result, 1), iteratee, comparator);
+    }
+
+    /**
+     * This base implementation of `_.zipObject` which assigns values using `assignFunc`.
+     *
+     * @private
+     * @param {Array} props The property identifiers.
+     * @param {Array} values The property values.
+     * @param {Function} assignFunc The function to assign values.
+     * @returns {Object} Returns the new object.
+     */
+    function baseZipObject(props, values, assignFunc) {
+      var index = -1,
+          length = props.length,
+          valsLength = values.length,
+          result = {};
+
+      while (++index < length) {
+        var value = index < valsLength ? values[index] : undefined;
+        assignFunc(result, props[index], value);
+      }
+      return result;
+    }
+
+    /**
+     * Casts `value` to an empty array if it's not an array like object.
+     *
+     * @private
+     * @param {*} value The value to inspect.
+     * @returns {Array|Object} Returns the cast array-like object.
+     */
+    function castArrayLikeObject(value) {
+      return isArrayLikeObject(value) ? value : [];
+    }
+
+    /**
+     * Casts `value` to `identity` if it's not a function.
+     *
+     * @private
+     * @param {*} value The value to inspect.
+     * @returns {Function} Returns cast function.
+     */
+    function castFunction(value) {
+      return typeof value == 'function' ? value : identity;
+    }
+
+    /**
+     * Casts `value` to a path array if it's not one.
+     *
+     * @private
+     * @param {*} value The value to inspect.
+     * @param {Object} [object] The object to query keys on.
+     * @returns {Array} Returns the cast property path array.
+     */
+    function castPath(value, object) {
+      if (isArray(value)) {
+        return value;
+      }
+      return isKey(value, object) ? [value] : stringToPath(toString(value));
+    }
+
+    /**
+     * A `baseRest` alias which can be replaced with `identity` by module
+     * replacement plugins.
+     *
+     * @private
+     * @type {Function}
+     * @param {Function} func The function to apply a rest parameter to.
+     * @returns {Function} Returns the new function.
+     */
+    var castRest = baseRest;
+
+    /**
+     * Casts `array` to a slice if it's needed.
+     *
+     * @private
+     * @param {Array} array The array to inspect.
+     * @param {number} start The start position.
+     * @param {number} [end=array.length] The end position.
+     * @returns {Array} Returns the cast slice.
+     */
+    function castSlice(array, start, end) {
+      var length = array.length;
+      end = end === undefined ? length : end;
+      return (!start && end >= length) ? array : baseSlice(array, start, end);
+    }
+
+    /**
+     * A simple wrapper around the global [`clearTimeout`](https://mdn.io/clearTimeout).
+     *
+     * @private
+     * @param {number|Object} id The timer id or timeout object of the timer to clear.
+     */
+    var clearTimeout = ctxClearTimeout || function(id) {
+      return root.clearTimeout(id);
+    };
+
+    /**
+     * Creates a clone of  `buffer`.
+     *
+     * @private
+     * @param {Buffer} buffer The buffer to clone.
+     * @param {boolean} [isDeep] Specify a deep clone.
+     * @returns {Buffer} Returns the cloned buffer.
+     */
+    function cloneBuffer(buffer, isDeep) {
+      if (isDeep) {
+        return buffer.slice();
+      }
+      var length = buffer.length,
+          result = allocUnsafe ? allocUnsafe(length) : new buffer.constructor(length);
+
+      buffer.copy(result);
+      return result;
+    }
+
+    /**
+     * Creates a clone of `arrayBuffer`.
+     *
+     * @private
+     * @param {ArrayBuffer} arrayBuffer The array buffer to clone.
+     * @returns {ArrayBuffer} Returns the cloned array buffer.
+     */
+    function cloneArrayBuffer(arrayBuffer) {
+      var result = new arrayBuffer.constructor(arrayBuffer.byteLength);
+      new Uint8Array(result).set(new Uint8Array(arrayBuffer));
+      return result;
+    }
+
+    /**
+     * Creates a clone of `dataView`.
+     *
+     * @private
+     * @param {Object} dataView The data view to clone.
+     * @param {boolean} [isDeep] Specify a deep clone.
+     * @returns {Object} Returns the cloned data view.
+     */
+    function cloneDataView(dataView, isDeep) {
+      var buffer = isDeep ? cloneArrayBuffer(dataView.buffer) : dataView.buffer;
+      return new dataView.constructor(buffer, dataView.byteOffset, dataView.byteLength);
+    }
+
+    /**
+     * Creates a clone of `regexp`.
+     *
+     * @private
+     * @param {Object} regexp The regexp to clone.
+     * @returns {Object} Returns the cloned regexp.
+     */
+    function cloneRegExp(regexp) {
+      var result = new regexp.constructor(regexp.source, reFlags.exec(regexp));
+      result.lastIndex = regexp.lastIndex;
+      return result;
+    }
+
+    /**
+     * Creates a clone of the `symbol` object.
+     *
+     * @private
+     * @param {Object} symbol The symbol object to clone.
+     * @returns {Object} Returns the cloned symbol object.
+     */
+    function cloneSymbol(symbol) {
+      return symbolValueOf ? Object(symbolValueOf.call(symbol)) : {};
+    }
+
+    /**
+     * Creates a clone of `typedArray`.
+     *
+     * @private
+     * @param {Object} typedArray The typed array to clone.
+     * @param {boolean} [isDeep] Specify a deep clone.
+     * @returns {Object} Returns the cloned typed array.
+     */
+    function cloneTypedArray(typedArray, isDeep) {
+      var buffer = isDeep ? cloneArrayBuffer(typedArray.buffer) : typedArray.buffer;
+      return new typedArray.constructor(buffer, typedArray.byteOffset, typedArray.length);
+    }
+
+    /**
+     * Compares values to sort them in ascending order.
+     *
+     * @private
+     * @param {*} value The value to compare.
+     * @param {*} other The other value to compare.
+     * @returns {number} Returns the sort order indicator for `value`.
+     */
+    function compareAscending(value, other) {
+      if (value !== other) {
+        var valIsDefined = value !== undefined,
+            valIsNull = value === null,
+            valIsReflexive = value === value,
+            valIsSymbol = isSymbol(value);
+
+        var othIsDefined = other !== undefined,
+            othIsNull = other === null,
+            othIsReflexive = other === other,
+            othIsSymbol = isSymbol(other);
+
+        if ((!othIsNull && !othIsSymbol && !valIsSymbol && value > other) ||
+            (valIsSymbol && othIsDefined && othIsReflexive && !othIsNull && !othIsSymbol) ||
+            (valIsNull && othIsDefined && othIsReflexive) ||
+            (!valIsDefined && othIsReflexive) ||
+            !valIsReflexive) {
+          return 1;
+        }
+        if ((!valIsNull && !valIsSymbol && !othIsSymbol && value < other) ||
+            (othIsSymbol && valIsDefined && valIsReflexive && !valIsNull && !valIsSymbol) ||
+            (othIsNull && valIsDefined && valIsReflexive) ||
+            (!othIsDefined && valIsReflexive) ||
+            !othIsReflexive) {
+          return -1;
+        }
+      }
+      return 0;
+    }
+
+    /**
+     * Used by `_.orderBy` to compare multiple properties of a value to another
+     * and stable sort them.
+     *
+     * If `orders` is unspecified, all values are sorted in ascending order. Otherwise,
+     * specify an order of "desc" for descending or "asc" for ascending sort order
+     * of corresponding values.
+     *
+     * @private
+     * @param {Object} object The object to compare.
+     * @param {Object} other The other object to compare.
+     * @param {boolean[]|string[]} orders The order to sort by for each property.
+     * @returns {number} Returns the sort order indicator for `object`.
+     */
+    function compareMultiple(object, other, orders) {
+      var index = -1,
+          objCriteria = object.criteria,
+          othCriteria = other.criteria,
+          length = objCriteria.length,
+          ordersLength = orders.length;
+
+      while (++index < length) {
+        var result = compareAscending(objCriteria[index], othCriteria[index]);
+        if (result) {
+          if (index >= ordersLength) {
+            return result;
+          }
+          var order = orders[index];
+          return result * (order == 'desc' ? -1 : 1);
+        }
+      }
+      // Fixes an `Array#sort` bug in the JS engine embedded in Adobe applications
+      // that causes it, under certain circumstances, to provide the same value for
+      // `object` and `other`. See https://github.com/jashkenas/underscore/pull/1247
+      // for more details.
+      //
+      // This also ensures a stable sort in V8 and other engines.
+      // See https://bugs.chromium.org/p/v8/issues/detail?id=90 for more details.
+      return object.index - other.index;
+    }
+
+    /**
+     * Creates an array that is the composition of partially applied arguments,
+     * placeholders, and provided arguments into a single array of arguments.
+     *
+     * @private
+     * @param {Array} args The provided arguments.
+     * @param {Array} partials The arguments to prepend to those provided.
+     * @param {Array} holders The `partials` placeholder indexes.
+     * @params {boolean} [isCurried] Specify composing for a curried function.
+     * @returns {Array} Returns the new array of composed arguments.
+     */
+    function composeArgs(args, partials, holders, isCurried) {
+      var argsIndex = -1,
+          argsLength = args.length,
+          holdersLength = holders.length,
+          leftIndex = -1,
+          leftLength = partials.length,
+          rangeLength = nativeMax(argsLength - holdersLength, 0),
+          result = Array(leftLength + rangeLength),
+          isUncurried = !isCurried;
+
+      while (++leftIndex < leftLength) {
+        result[leftIndex] = partials[leftIndex];
+      }
+      while (++argsIndex < holdersLength) {
+        if (isUncurried || argsIndex < argsLength) {
+          result[holders[argsIndex]] = args[argsIndex];
+        }
+      }
+      while (rangeLength--) {
+        result[leftIndex++] = args[argsIndex++];
+      }
+      return result;
+    }
+
+    /**
+     * This function is like `composeArgs` except that the arguments composition
+     * is tailored for `_.partialRight`.
+     *
+     * @private
+     * @param {Array} args The provided arguments.
+     * @param {Array} partials The arguments to append to those provided.
+     * @param {Array} holders The `partials` placeholder indexes.
+     * @params {boolean} [isCurried] Specify composing for a curried function.
+     * @returns {Array} Returns the new array of composed arguments.
+     */
+    function composeArgsRight(args, partials, holders, isCurried) {
+      var argsIndex = -1,
+          argsLength = args.length,
+          holdersIndex = -1,
+          holdersLength = holders.length,
+          rightIndex = -1,
+          rightLength = partials.length,
+          rangeLength = nativeMax(argsLength - holdersLength, 0),
+          result = Array(rangeLength + rightLength),
+          isUncurried = !isCurried;
+
+      while (++argsIndex < rangeLength) {
+        result[argsIndex] = args[argsIndex];
+      }
+      var offset = argsIndex;
+      while (++rightIndex < rightLength) {
+        result[offset + rightIndex] = partials[rightIndex];
+      }
+      while (++holdersIndex < holdersLength) {
+        if (isUncurried || argsIndex < argsLength) {
+          result[offset + holders[holdersIndex]] = args[argsIndex++];
+        }
+      }
+      return result;
+    }
+
+    /**
+     * Copies the values of `source` to `array`.
+     *
+     * @private
+     * @param {Array} source The array to copy values from.
+     * @param {Array} [array=[]] The array to copy values to.
+     * @returns {Array} Returns `array`.
+     */
+    function copyArray(source, array) {
+      var index = -1,
+          length = source.length;
+
+      array || (array = Array(length));
+      while (++index < length) {
+        array[index] = source[index];
+      }
+      return array;
+    }
+
+    /**
+     * Copies properties of `source` to `object`.
+     *
+     * @private
+     * @param {Object} source The object to copy properties from.
+     * @param {Array} props The property identifiers to copy.
+     * @param {Object} [object={}] The object to copy properties to.
+     * @param {Function} [customizer] The function to customize copied values.
+     * @returns {Object} Returns `object`.
+     */
+    function copyObject(source, props, object, customizer) {
+      var isNew = !object;
+      object || (object = {});
+
+      var index = -1,
+          length = props.length;
+
+      while (++index < length) {
+        var key = props[index];
+
+        var newValue = customizer
+          ? customizer(object[key], source[key], key, object, source)
+          : undefined;
+
+        if (newValue === undefined) {
+          newValue = source[key];
+        }
+        if (isNew) {
+          baseAssignValue(object, key, newValue);
+        } else {
+          assignValue(object, key, newValue);
+        }
+      }
+      return object;
+    }
+
+    /**
+     * Copies own symbols of `source` to `object`.
+     *
+     * @private
+     * @param {Object} source The object to copy symbols from.
+     * @param {Object} [object={}] The object to copy symbols to.
+     * @returns {Object} Returns `object`.
+     */
+    function copySymbols(source, object) {
+      return copyObject(source, getSymbols(source), object);
+    }
+
+    /**
+     * Copies own and inherited symbols of `source` to `object`.
+     *
+     * @private
+     * @param {Object} source The object to copy symbols from.
+     * @param {Object} [object={}] The object to copy symbols to.
+     * @returns {Object} Returns `object`.
+     */
+    function copySymbolsIn(source, object) {
+      return copyObject(source, getSymbolsIn(source), object);
+    }
+
+    /**
+     * Creates a function like `_.groupBy`.
+     *
+     * @private
+     * @param {Function} setter The function to set accumulator values.
+     * @param {Function} [initializer] The accumulator object initializer.
+     * @returns {Function} Returns the new aggregator function.
+     */
+    function createAggregator(setter, initializer) {
+      return function(collection, iteratee) {
+        var func = isArray(collection) ? arrayAggregator : baseAggregator,
+            accumulator = initializer ? initializer() : {};
+
+        return func(collection, setter, getIteratee(iteratee, 2), accumulator);
+      };
+    }
+
+    /**
+     * Creates a function like `_.assign`.
+     *
+     * @private
+     * @param {Function} assigner The function to assign values.
+     * @returns {Function} Returns the new assigner function.
+     */
+    function createAssigner(assigner) {
+      return baseRest(function(object, sources) {
+        var index = -1,
+            length = sources.length,
+            customizer = length > 1 ? sources[length - 1] : undefined,
+            guard = length > 2 ? sources[2] : undefined;
+
+        customizer = (assigner.length > 3 && typeof customizer == 'function')
+          ? (length--, customizer)
+          : undefined;
+
+        if (guard && isIterateeCall(sources[0], sources[1], guard)) {
+          customizer = length < 3 ? undefined : customizer;
+          length = 1;
+        }
+        object = Object(object);
+        while (++index < length) {
+          var source = sources[index];
+          if (source) {
+            assigner(object, source, index, customizer);
+          }
+        }
+        return object;
+      });
+    }
+
+    /**
+     * Creates a `baseEach` or `baseEachRight` function.
+     *
+     * @private
+     * @param {Function} eachFunc The function to iterate over a collection.
+     * @param {boolean} [fromRight] Specify iterating from right to left.
+     * @returns {Function} Returns the new base function.
+     */
+    function createBaseEach(eachFunc, fromRight) {
+      return function(collection, iteratee) {
+        if (collection == null) {
+          return collection;
+        }
+        if (!isArrayLike(collection)) {
+          return eachFunc(collection, iteratee);
+        }
+        var length = collection.length,
+            index = fromRight ? length : -1,
+            iterable = Object(collection);
+
+        while ((fromRight ? index-- : ++index < length)) {
+          if (iteratee(iterable[index], index, iterable) === false) {
+            break;
+          }
+        }
+        return collection;
+      };
+    }
+
+    /**
+     * Creates a base function for methods like `_.forIn` and `_.forOwn`.
+     *
+     * @private
+     * @param {boolean} [fromRight] Specify iterating from right to left.
+     * @returns {Function} Returns the new base function.
+     */
+    function createBaseFor(fromRight) {
+      return function(object, iteratee, keysFunc) {
+        var index = -1,
+            iterable = Object(object),
+            props = keysFunc(object),
+            length = props.length;
+
+        while (length--) {
+          var key = props[fromRight ? length : ++index];
+          if (iteratee(iterable[key], key, iterable) === false) {
+            break;
+          }
+        }
+        return object;
+      };
+    }
+
+    /**
+     * Creates a function that wraps `func` to invoke it with the optional `this`
+     * binding of `thisArg`.
+     *
+     * @private
+     * @param {Function} func The function to wrap.
+     * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
+     * @param {*} [thisArg] The `this` binding of `func`.
+     * @returns {Function} Returns the new wrapped function.
+     */
+    function createBind(func, bitmask, thisArg) {
+      var isBind = bitmask & WRAP_BIND_FLAG,
+          Ctor = createCtor(func);
+
+      function wrapper() {
+        var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
+        return fn.apply(isBind ? thisArg : this, arguments);
+      }
+      return wrapper;
+    }
+
+    /**
+     * Creates a function like `_.lowerFirst`.
+     *
+     * @private
+     * @param {string} methodName The name of the `String` case method to use.
+     * @returns {Function} Returns the new case function.
+     */
+    function createCaseFirst(methodName) {
+      return function(string) {
+        string = toString(string);
+
+        var strSymbols = hasUnicode(string)
+          ? stringToArray(string)
+          : undefined;
+
+        var chr = strSymbols
+          ? strSymbols[0]
+          : string.charAt(0);
+
+        var trailing = strSymbols
+          ? castSlice(strSymbols, 1).join('')
+          : string.slice(1);
+
+        return chr[methodName]() + trailing;
+      };
+    }
+
+    /**
+     * Creates a function like `_.camelCase`.
+     *
+     * @private
+     * @param {Function} callback The function to combine each word.
+     * @returns {Function} Returns the new compounder function.
+     */
+    function createCompounder(callback) {
+      return function(string) {
+        return arrayReduce(words(deburr(string).replace(reApos, '')), callback, '');
+      };
+    }
+
+    /**
+     * Creates a function that produces an instance of `Ctor` regardless of
+     * whether it was invoked as part of a `new` expression or by `call` or `apply`.
+     *
+     * @private
+     * @param {Function} Ctor The constructor to wrap.
+     * @returns {Function} Returns the new wrapped function.
+     */
+    function createCtor(Ctor) {
+      return function() {
+        // Use a `switch` statement to work with class constructors. See
+        // http://ecma-international.org/ecma-262/7.0/#sec-ecmascript-function-objects-call-thisargument-argumentslist
+        // for more details.
+        var args = arguments;
+        switch (args.length) {
+          case 0: return new Ctor;
+          case 1: return new Ctor(args[0]);
+          case 2: return new Ctor(args[0], args[1]);
+          case 3: return new Ctor(args[0], args[1], args[2]);
+          case 4: return new Ctor(args[0], args[1], args[2], args[3]);
+          case 5: return new Ctor(args[0], args[1], args[2], args[3], args[4]);
+          case 6: return new Ctor(args[0], args[1], args[2], args[3], args[4], args[5]);
+          case 7: return new Ctor(args[0], args[1], args[2], args[3], args[4], args[5], args[6]);
+        }
+        var thisBinding = baseCreate(Ctor.prototype),
+            result = Ctor.apply(thisBinding, args);
+
+        // Mimic the constructor's `return` behavior.
+        // See https://es5.github.io/#x13.2.2 for more details.
+        return isObject(result) ? result : thisBinding;
+      };
+    }
+
+    /**
+     * Creates a function that wraps `func` to enable currying.
+     *
+     * @private
+     * @param {Function} func The function to wrap.
+     * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
+     * @param {number} arity The arity of `func`.
+     * @returns {Function} Returns the new wrapped function.
+     */
+    function createCurry(func, bitmask, arity) {
+      var Ctor = createCtor(func);
+
+      function wrapper() {
+        var length = arguments.length,
+            args = Array(length),
+            index = length,
+            placeholder = getHolder(wrapper);
+
+        while (index--) {
+          args[index] = arguments[index];
+        }
+        var holders = (length < 3 && args[0] !== placeholder && args[length - 1] !== placeholder)
+          ? []
+          : replaceHolders(args, placeholder);
+
+        length -= holders.length;
+        if (length < arity) {
+          return createRecurry(
+            func, bitmask, createHybrid, wrapper.placeholder, undefined,
+            args, holders, undefined, undefined, arity - length);
+        }
+        var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
+        return apply(fn, this, args);
+      }
+      return wrapper;
+    }
+
+    /**
+     * Creates a `_.find` or `_.findLast` function.
+     *
+     * @private
+     * @param {Function} findIndexFunc The function to find the collection index.
+     * @returns {Function} Returns the new find function.
+     */
+    function createFind(findIndexFunc) {
+      return function(collection, predicate, fromIndex) {
+        var iterable = Object(collection);
+        if (!isArrayLike(collection)) {
+          var iteratee = getIteratee(predicate, 3);
+          collection = keys(collection);
+          predicate = function(key) { return iteratee(iterable[key], key, iterable); };
+        }
+        var index = findIndexFunc(collection, predicate, fromIndex);
+        return index > -1 ? iterable[iteratee ? collection[index] : index] : undefined;
+      };
+    }
+
+    /**
+     * Creates a `_.flow` or `_.flowRight` function.
+     *
+     * @private
+     * @param {boolean} [fromRight] Specify iterating from right to left.
+     * @returns {Function} Returns the new flow function.
+     */
+    function createFlow(fromRight) {
+      return flatRest(function(funcs) {
+        var length = funcs.length,
+            index = length,
+            prereq = LodashWrapper.prototype.thru;
+
+        if (fromRight) {
+          funcs.reverse();
+        }
+        while (index--) {
+          var func = funcs[index];
+          if (typeof func != 'function') {
+            throw new TypeError(FUNC_ERROR_TEXT);
+          }
+          if (prereq && !wrapper && getFuncName(func) == 'wrapper') {
+            var wrapper = new LodashWrapper([], true);
+          }
+        }
+        index = wrapper ? index : length;
+        while (++index < length) {
+          func = funcs[index];
+
+          var funcName = getFuncName(func),
+              data = funcName == 'wrapper' ? getData(func) : undefined;
+
+          if (data && isLaziable(data[0]) &&
+                data[1] == (WRAP_ARY_FLAG | WRAP_CURRY_FLAG | WRAP_PARTIAL_FLAG | WRAP_REARG_FLAG) &&
+                !data[4].length && data[9] == 1
+              ) {
+            wrapper = wrapper[getFuncName(data[0])].apply(wrapper, data[3]);
+          } else {
+            wrapper = (func.length == 1 && isLaziable(func))
+              ? wrapper[funcName]()
+              : wrapper.thru(func);
+          }
+        }
+        return function() {
+          var args = arguments,
+              value = args[0];
+
+          if (wrapper && args.length == 1 && isArray(value)) {
+            return wrapper.plant(value).value();
+          }
+          var index = 0,
+              result = length ? funcs[index].apply(this, args) : value;
+
+          while (++index < length) {
+            result = funcs[index].call(this, result);
+          }
+          return result;
+        };
+      });
+    }
+
+    /**
+     * Creates a function that wraps `func` to invoke it with optional `this`
+     * binding of `thisArg`, partial application, and currying.
+     *
+     * @private
+     * @param {Function|string} func The function or method name to wrap.
+     * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
+     * @param {*} [thisArg] The `this` binding of `func`.
+     * @param {Array} [partials] The arguments to prepend to those provided to
+     *  the new function.
+     * @param {Array} [holders] The `partials` placeholder indexes.
+     * @param {Array} [partialsRight] The arguments to append to those provided
+     *  to the new function.
+     * @param {Array} [holdersRight] The `partialsRight` placeholder indexes.
+     * @param {Array} [argPos] The argument positions of the new function.
+     * @param {number} [ary] The arity cap of `func`.
+     * @param {number} [arity] The arity of `func`.
+     * @returns {Function} Returns the new wrapped function.
+     */
+    function createHybrid(func, bitmask, thisArg, partials, holders, partialsRight, holdersRight, argPos, ary, arity) {
+      var isAry = bitmask & WRAP_ARY_FLAG,
+          isBind = bitmask & WRAP_BIND_FLAG,
+          isBindKey = bitmask & WRAP_BIND_KEY_FLAG,
+          isCurried = bitmask & (WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG),
+          isFlip = bitmask & WRAP_FLIP_FLAG,
+          Ctor = isBindKey ? undefined : createCtor(func);
+
+      function wrapper() {
+        var length = arguments.length,
+            args = Array(length),
+            index = length;
+
+        while (index--) {
+          args[index] = arguments[index];
+        }
+        if (isCurried) {
+          var placeholder = getHolder(wrapper),
+              holdersCount = countHolders(args, placeholder);
+        }
+        if (partials) {
+          args = composeArgs(args, partials, holders, isCurried);
+        }
+        if (partialsRight) {
+          args = composeArgsRight(args, partialsRight, holdersRight, isCurried);
+        }
+        length -= holdersCount;
+        if (isCurried && length < arity) {
+          var newHolders = replaceHolders(args, placeholder);
+          return createRecurry(
+            func, bitmask, createHybrid, wrapper.placeholder, thisArg,
+            args, newHolders, argPos, ary, arity - length
+          );
+        }
+        var thisBinding = isBind ? thisArg : this,
+            fn = isBindKey ? thisBinding[func] : func;
+
+        length = args.length;
+        if (argPos) {
+          args = reorder(args, argPos);
+        } else if (isFlip && length > 1) {
+          args.reverse();
+        }
+        if (isAry && ary < length) {
+          args.length = ary;
+        }
+        if (this && this !== root && this instanceof wrapper) {
+          fn = Ctor || createCtor(fn);
+        }
+        return fn.apply(thisBinding, args);
+      }
+      return wrapper;
+    }
+
+    /**
+     * Creates a function like `_.invertBy`.
+     *
+     * @private
+     * @param {Function} setter The function to set accumulator values.
+     * @param {Function} toIteratee The function to resolve iteratees.
+     * @returns {Function} Returns the new inverter function.
+     */
+    function createInverter(setter, toIteratee) {
+      return function(object, iteratee) {
+        return baseInverter(object, setter, toIteratee(iteratee), {});
+      };
+    }
+
+    /**
+     * Creates a function that performs a mathematical operation on two values.
+     *
+     * @private
+     * @param {Function} operator The function to perform the operation.
+     * @param {number} [defaultValue] The value used for `undefined` arguments.
+     * @returns {Function} Returns the new mathematical operation function.
+     */
+    function createMathOperation(operator, defaultValue) {
+      return function(value, other) {
+        var result;
+        if (value === undefined && other === undefined) {
+          return defaultValue;
+        }
+        if (value !== undefined) {
+          result = value;
+        }
+        if (other !== undefined) {
+          if (result === undefined) {
+            return other;
+          }
+          if (typeof value == 'string' || typeof other == 'string') {
+            value = baseToString(value);
+            other = baseToString(other);
+          } else {
+            value = baseToNumber(value);
+            other = baseToNumber(other);
+          }
+          result = operator(value, other);
+        }
+        return result;
+      };
+    }
+
+    /**
+     * Creates a function like `_.over`.
+     *
+     * @private
+     * @param {Function} arrayFunc The function to iterate over iteratees.
+     * @returns {Function} Returns the new over function.
+     */
+    function createOver(arrayFunc) {
+      return flatRest(function(iteratees) {
+        iteratees = arrayMap(iteratees, baseUnary(getIteratee()));
+        return baseRest(function(args) {
+          var thisArg = this;
+          return arrayFunc(iteratees, function(iteratee) {
+            return apply(iteratee, thisArg, args);
+          });
+        });
+      });
+    }
+
+    /**
+     * Creates the padding for `string` based on `length`. The `chars` string
+     * is truncated if the number of characters exceeds `length`.
+     *
+     * @private
+     * @param {number} length The padding length.
+     * @param {string} [chars=' '] The string used as padding.
+     * @returns {string} Returns the padding for `string`.
+     */
+    function createPadding(length, chars) {
+      chars = chars === undefined ? ' ' : baseToString(chars);
+
+      var charsLength = chars.length;
+      if (charsLength < 2) {
+        return charsLength ? baseRepeat(chars, length) : chars;
+      }
+      var result = baseRepeat(chars, nativeCeil(length / stringSize(chars)));
+      return hasUnicode(chars)
+        ? castSlice(stringToArray(result), 0, length).join('')
+        : result.slice(0, length);
+    }
+
+    /**
+     * Creates a function that wraps `func` to invoke it with the `this` binding
+     * of `thisArg` and `partials` prepended to the arguments it receives.
+     *
+     * @private
+     * @param {Function} func The function to wrap.
+     * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
+     * @param {*} thisArg The `this` binding of `func`.
+     * @param {Array} partials The arguments to prepend to those provided to
+     *  the new function.
+     * @returns {Function} Returns the new wrapped function.
+     */
+    function createPartial(func, bitmask, thisArg, partials) {
+      var isBind = bitmask & WRAP_BIND_FLAG,
+          Ctor = createCtor(func);
+
+      function wrapper() {
+        var argsIndex = -1,
+            argsLength = arguments.length,
+            leftIndex = -1,
+            leftLength = partials.length,
+            args = Array(leftLength + argsLength),
+            fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
+
+        while (++leftIndex < leftLength) {
+          args[leftIndex] = partials[leftIndex];
+        }
+        while (argsLength--) {
+          args[leftIndex++] = arguments[++argsIndex];
+        }
+        return apply(fn, isBind ? thisArg : this, args);
+      }
+      return wrapper;
+    }
+
+    /**
+     * Creates a `_.range` or `_.rangeRight` function.
+     *
+     * @private
+     * @param {boolean} [fromRight] Specify iterating from right to left.
+     * @returns {Function} Returns the new range function.
+     */
+    function createRange(fromRight) {
+      return function(start, end, step) {
+        if (step && typeof step != 'number' && isIterateeCall(start, end, step)) {
+          end = step = undefined;
+        }
+        // Ensure the sign of `-0` is preserved.
+        start = toFinite(start);
+        if (end === undefined) {
+          end = start;
+          start = 0;
+        } else {
+          end = toFinite(end);
+        }
+        step = step === undefined ? (start < end ? 1 : -1) : toFinite(step);
+        return baseRange(start, end, step, fromRight);
+      };
+    }
+
+    /**
+     * Creates a function that performs a relational operation on two values.
+     *
+     * @private
+     * @param {Function} operator The function to perform the operation.
+     * @returns {Function} Returns the new relational operation function.
+     */
+    function createRelationalOperation(operator) {
+      return function(value, other) {
+        if (!(typeof value == 'string' && typeof other == 'string')) {
+          value = toNumber(value);
+          other = toNumber(other);
+        }
+        return operator(value, other);
+      };
+    }
+
+    /**
+     * Creates a function that wraps `func` to continue currying.
+     *
+     * @private
+     * @param {Function} func The function to wrap.
+     * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
+     * @param {Function} wrapFunc The function to create the `func` wrapper.
+     * @param {*} placeholder The placeholder value.
+     * @param {*} [thisArg] The `this` binding of `func`.
+     * @param {Array} [partials] The arguments to prepend to those provided to
+     *  the new function.
+     * @param {Array} [holders] The `partials` placeholder indexes.
+     * @param {Array} [argPos] The argument positions of the new function.
+     * @param {number} [ary] The arity cap of `func`.
+     * @param {number} [arity] The arity of `func`.
+     * @returns {Function} Returns the new wrapped function.
+     */
+    function createRecurry(func, bitmask, wrapFunc, placeholder, thisArg, partials, holders, argPos, ary, arity) {
+      var isCurry = bitmask & WRAP_CURRY_FLAG,
+          newHolders = isCurry ? holders : undefined,
+          newHoldersRight = isCurry ? undefined : holders,
+          newPartials = isCurry ? partials : undefined,
+          newPartialsRight = isCurry ? undefined : partials;
+
+      bitmask |= (isCurry ? WRAP_PARTIAL_FLAG : WRAP_PARTIAL_RIGHT_FLAG);
+      bitmask &= ~(isCurry ? WRAP_PARTIAL_RIGHT_FLAG : WRAP_PARTIAL_FLAG);
+
+      if (!(bitmask & WRAP_CURRY_BOUND_FLAG)) {
+        bitmask &= ~(WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG);
+      }
+      var newData = [
+        func, bitmask, thisArg, newPartials, newHolders, newPartialsRight,
+        newHoldersRight, argPos, ary, arity
+      ];
+
+      var result = wrapFunc.apply(undefined, newData);
+      if (isLaziable(func)) {
+        setData(result, newData);
+      }
+      result.placeholder = placeholder;
+      return setWrapToString(result, func, bitmask);
+    }
+
+    /**
+     * Creates a function like `_.round`.
+     *
+     * @private
+     * @param {string} methodName The name of the `Math` method to use when rounding.
+     * @returns {Function} Returns the new round function.
+     */
+    function createRound(methodName) {
+      var func = Math[methodName];
+      return function(number, precision) {
+        number = toNumber(number);
+        precision = precision == null ? 0 : nativeMin(toInteger(precision), 292);
+        if (precision && nativeIsFinite(number)) {
+          // Shift with exponential notation to avoid floating-point issues.
+          // See [MDN](https://mdn.io/round#Examples) for more details.
+          var pair = (toString(number) + 'e').split('e'),
+              value = func(pair[0] + 'e' + (+pair[1] + precision));
+
+          pair = (toString(value) + 'e').split('e');
+          return +(pair[0] + 'e' + (+pair[1] - precision));
+        }
+        return func(number);
+      };
+    }
+
+    /**
+     * Creates a set object of `values`.
+     *
+     * @private
+     * @param {Array} values The values to add to the set.
+     * @returns {Object} Returns the new set.
+     */
+    var createSet = !(Set && (1 / setToArray(new Set([,-0]))[1]) == INFINITY) ? noop : function(values) {
+      return new Set(values);
+    };
+
+    /**
+     * Creates a `_.toPairs` or `_.toPairsIn` function.
+     *
+     * @private
+     * @param {Function} keysFunc The function to get the keys of a given object.
+     * @returns {Function} Returns the new pairs function.
+     */
+    function createToPairs(keysFunc) {
+      return function(object) {
+        var tag = getTag(object);
+        if (tag == mapTag) {
+          return mapToArray(object);
+        }
+        if (tag == setTag) {
+          return setToPairs(object);
+        }
+        return baseToPairs(object, keysFunc(object));
+      };
+    }
+
+    /**
+     * Creates a function that either curries or invokes `func` with optional
+     * `this` binding and partially applied arguments.
+     *
+     * @private
+     * @param {Function|string} func The function or method name to wrap.
+     * @param {number} bitmask The bitmask flags.
+     *    1 - `_.bind`
+     *    2 - `_.bindKey`
+     *    4 - `_.curry` or `_.curryRight` of a bound function
+     *    8 - `_.curry`
+     *   16 - `_.curryRight`
+     *   32 - `_.partial`
+     *   64 - `_.partialRight`
+     *  128 - `_.rearg`
+     *  256 - `_.ary`
+     *  512 - `_.flip`
+     * @param {*} [thisArg] The `this` binding of `func`.
+     * @param {Array} [partials] The arguments to be partially applied.
+     * @param {Array} [holders] The `partials` placeholder indexes.
+     * @param {Array} [argPos] The argument positions of the new function.
+     * @param {number} [ary] The arity cap of `func`.
+     * @param {number} [arity] The arity of `func`.
+     * @returns {Function} Returns the new wrapped function.
+     */
+    function createWrap(func, bitmask, thisArg, partials, holders, argPos, ary, arity) {
+      var isBindKey = bitmask & WRAP_BIND_KEY_FLAG;
+      if (!isBindKey && typeof func != 'function') {
+        throw new TypeError(FUNC_ERROR_TEXT);
+      }
+      var length = partials ? partials.length : 0;
+      if (!length) {
+        bitmask &= ~(WRAP_PARTIAL_FLAG | WRAP_PARTIAL_RIGHT_FLAG);
+        partials = holders = undefined;
+      }
+      ary = ary === undefined ? ary : nativeMax(toInteger(ary), 0);
+      arity = arity === undefined ? arity : toInteger(arity);
+      length -= holders ? holders.length : 0;
+
+      if (bitmask & WRAP_PARTIAL_RIGHT_FLAG) {
+        var partialsRight = partials,
+            holdersRight = holders;
+
+        partials = holders = undefined;
+      }
+      var data = isBindKey ? undefined : getData(func);
+
+      var newData = [
+        func, bitmask, thisArg, partials, holders, partialsRight, holdersRight,
+        argPos, ary, arity
+      ];
+
+      if (data) {
+        mergeData(newData, data);
+      }
+      func = newData[0];
+      bitmask = newData[1];
+      thisArg = newData[2];
+      partials = newData[3];
+      holders = newData[4];
+      arity = newData[9] = newData[9] === undefined
+        ? (isBindKey ? 0 : func.length)
+        : nativeMax(newData[9] - length, 0);
+
+      if (!arity && bitmask & (WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG)) {
+        bitmask &= ~(WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG);
+      }
+      if (!bitmask || bitmask == WRAP_BIND_FLAG) {
+        var result = createBind(func, bitmask, thisArg);
+      } else if (bitmask == WRAP_CURRY_FLAG || bitmask == WRAP_CURRY_RIGHT_FLAG) {
+        result = createCurry(func, bitmask, arity);
+      } else if ((bitmask == WRAP_PARTIAL_FLAG || bitmask == (WRAP_BIND_FLAG | WRAP_PARTIAL_FLAG)) && !holders.length) {
+        result = createPartial(func, bitmask, thisArg, partials);
+      } else {
+        result = createHybrid.apply(undefined, newData);
+      }
+      var setter = data ? baseSetData : setData;
+      return setWrapToString(setter(result, newData), func, bitmask);
+    }
+
+    /**
+     * Used by `_.defaults` to customize its `_.assignIn` use to assign properties
+     * of source objects to the destination object for all destination properties
+     * that resolve to `undefined`.
+     *
+     * @private
+     * @param {*} objValue The destination value.
+     * @param {*} srcValue The source value.
+     * @param {string} key The key of the property to assign.
+     * @param {Object} object The parent object of `objValue`.
+     * @returns {*} Returns the value to assign.
+     */
+    function customDefaultsAssignIn(objValue, srcValue, key, object) {
+      if (objValue === undefined ||
+          (eq(objValue, objectProto[key]) && !hasOwnProperty.call(object, key))) {
+        return srcValue;
+      }
+      return objValue;
+    }
+
+    /**
+     * Used by `_.defaultsDeep` to customize its `_.merge` use to merge source
+     * objects into destination objects that are passed thru.
+     *
+     * @private
+     * @param {*} objValue The destination value.
+     * @param {*} srcValue The source value.
+     * @param {string} key The key of the property to merge.
+     * @param {Object} object The parent object of `objValue`.
+     * @param {Object} source The parent object of `srcValue`.
+     * @param {Object} [stack] Tracks traversed source values and their merged
+     *  counterparts.
+     * @returns {*} Returns the value to assign.
+     */
+    function customDefaultsMerge(objValue, srcValue, key, object, source, stack) {
+      if (isObject(objValue) && isObject(srcValue)) {
+        // Recursively merge objects and arrays (susceptible to call stack limits).
+        stack.set(srcValue, objValue);
+        baseMerge(objValue, srcValue, undefined, customDefaultsMerge, stack);
+        stack['delete'](srcValue);
+      }
+      return objValue;
+    }
+
+    /**
+     * Used by `_.omit` to customize its `_.cloneDeep` use to only clone plain
+     * objects.
+     *
+     * @private
+     * @param {*} value The value to inspect.
+     * @param {string} key The key of the property to inspect.
+     * @returns {*} Returns the uncloned value or `undefined` to defer cloning to `_.cloneDeep`.
+     */
+    function customOmitClone(value) {
+      return isPlainObject(value) ? undefined : value;
+    }
+
+    /**
+     * A specialized version of `baseIsEqualDeep` for arrays with support for
+     * partial deep comparisons.
+     *
+     * @private
+     * @param {Array} array The array to compare.
+     * @param {Array} other The other array to compare.
+     * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
+     * @param {Function} customizer The function to customize comparisons.
+     * @param {Function} equalFunc The function to determine equivalents of values.
+     * @param {Object} stack Tracks traversed `array` and `other` objects.
+     * @returns {boolean} Returns `true` if the arrays are equivalent, else `false`.
+     */
+    function equalArrays(array, other, bitmask, customizer, equalFunc, stack) {
+      var isPartial = bitmask & COMPARE_PARTIAL_FLAG,
+          arrLength = array.length,
+          othLength = other.length;
+
+      if (arrLength != othLength && !(isPartial && othLength > arrLength)) {
+        return false;
+      }
+      // Check that cyclic values are equal.
+      var arrStacked = stack.get(array);
+      var othStacked = stack.get(other);
+      if (arrStacked && othStacked) {
+        return arrStacked == other && othStacked == array;
+      }
+      var index = -1,
+          result = true,
+          seen = (bitmask & COMPARE_UNORDERED_FLAG) ? new SetCache : undefined;
+
+      stack.set(array, other);
+      stack.set(other, array);
+
+      // Ignore non-index properties.
+      while (++index < arrLength) {
+        var arrValue = array[index],
+            othValue = other[index];
+
+        if (customizer) {
+          var compared = isPartial
+            ? customizer(othValue, arrValue, index, other, array, stack)
+            : customizer(arrValue, othValue, index, array, other, stack);
+        }
+        if (compared !== undefined) {
+          if (compared) {
+            continue;
+          }
+          result = false;
+          break;
+        }
+        // Recursively compare arrays (susceptible to call stack limits).
+        if (seen) {
+          if (!arraySome(other, function(othValue, othIndex) {
+                if (!cacheHas(seen, othIndex) &&
+                    (arrValue === othValue || equalFunc(arrValue, othValue, bitmask, customizer, stack))) {
+                  return seen.push(othIndex);
+                }
+              })) {
+            result = false;
+            break;
+          }
+        } else if (!(
+              arrValue === othValue ||
+                equalFunc(arrValue, othValue, bitmask, customizer, stack)
+            )) {
+          result = false;
+          break;
+        }
+      }
+      stack['delete'](array);
+      stack['delete'](other);
+      return result;
+    }
+
+    /**
+     * A specialized version of `baseIsEqualDeep` for comparing objects of
+     * the same `toStringTag`.
+     *
+     * **Note:** This function only supports comparing values with tags of
+     * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`.
+     *
+     * @private
+     * @param {Object} object The object to compare.
+     * @param {Object} other The other object to compare.
+     * @param {string} tag The `toStringTag` of the objects to compare.
+     * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
+     * @param {Function} customizer The function to customize comparisons.
+     * @param {Function} equalFunc The function to determine equivalents of values.
+     * @param {Object} stack Tracks traversed `object` and `other` objects.
+     * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
+     */
+    function equalByTag(object, other, tag, bitmask, customizer, equalFunc, stack) {
+      switch (tag) {
+        case dataViewTag:
+          if ((object.byteLength != other.byteLength) ||
+              (object.byteOffset != other.byteOffset)) {
+            return false;
+          }
+          object = object.buffer;
+          other = other.buffer;
+
+        case arrayBufferTag:
+          if ((object.byteLength != other.byteLength) ||
+              !equalFunc(new Uint8Array(object), new Uint8Array(other))) {
+            return false;
+          }
+          return true;
+
+        case boolTag:
+        case dateTag:
+        case numberTag:
+          // Coerce booleans to `1` or `0` and dates to milliseconds.
+          // Invalid dates are coerced to `NaN`.
+          return eq(+object, +other);
+
+        case errorTag:
+          return object.name == other.name && object.message == other.message;
+
+        case regexpTag:
+        case stringTag:
+          // Coerce regexes to strings and treat strings, primitives and objects,
+          // as equal. See http://www.ecma-international.org/ecma-262/7.0/#sec-regexp.prototype.tostring
+          // for more details.
+          return object == (other + '');
+
+        case mapTag:
+          var convert = mapToArray;
+
+        case setTag:
+          var isPartial = bitmask & COMPARE_PARTIAL_FLAG;
+          convert || (convert = setToArray);
+
+          if (object.size != other.size && !isPartial) {
+            return false;
+          }
+          // Assume cyclic values are equal.
+          var stacked = stack.get(object);
+          if (stacked) {
+            return stacked == other;
+          }
+          bitmask |= COMPARE_UNORDERED_FLAG;
+
+          // Recursively compare objects (susceptible to call stack limits).
+          stack.set(object, other);
+          var result = equalArrays(convert(object), convert(other), bitmask, customizer, equalFunc, stack);
+          stack['delete'](object);
+          return result;
+
+        case symbolTag:
+          if (symbolValueOf) {
+            return symbolValueOf.call(object) == symbolValueOf.call(other);
+          }
+      }
+      return false;
+    }
+
+    /**
+     * A specialized version of `baseIsEqualDeep` for objects with support for
+     * partial deep comparisons.
+     *
+     * @private
+     * @param {Object} object The object to compare.
+     * @param {Object} other The other object to compare.
+     * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
+     * @param {Function} customizer The function to customize comparisons.
+     * @param {Function} equalFunc The function to determine equivalents of values.
+     * @param {Object} stack Tracks traversed `object` and `other` objects.
+     * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
+     */
+    function equalObjects(object, other, bitmask, customizer, equalFunc, stack) {
+      var isPartial = bitmask & COMPARE_PARTIAL_FLAG,
+          objProps = getAllKeys(object),
+          objLength = objProps.length,
+          othProps = getAllKeys(other),
+          othLength = othProps.length;
+
+      if (objLength != othLength && !isPartial) {
+        return false;
+      }
+      var index = objLength;
+      while (index--) {
+        var key = objProps[index];
+        if (!(isPartial ? key in other : hasOwnProperty.call(other, key))) {
+          return false;
+        }
+      }
+      // Check that cyclic values are equal.
+      var objStacked = stack.get(object);
+      var othStacked = stack.get(other);
+      if (objStacked && othStacked) {
+        return objStacked == other && othStacked == object;
+      }
+      var result = true;
+      stack.set(object, other);
+      stack.set(other, object);
+
+      var skipCtor = isPartial;
+      while (++index < objLength) {
+        key = objProps[index];
+        var objValue = object[key],
+            othValue = other[key];
+
+        if (customizer) {
+          var compared = isPartial
+            ? customizer(othValue, objValue, key, other, object, stack)
+            : customizer(objValue, othValue, key, object, other, stack);
+        }
+        // Recursively compare objects (susceptible to call stack limits).
+        if (!(compared === undefined
+              ? (objValue === othValue || equalFunc(objValue, othValue, bitmask, customizer, stack))
+              : compared
+            )) {
+          result = false;
+          break;
+        }
+        skipCtor || (skipCtor = key == 'constructor');
+      }
+      if (result && !skipCtor) {
+        var objCtor = object.constructor,
+            othCtor = other.constructor;
+
+        // Non `Object` object instances with different constructors are not equal.
+        if (objCtor != othCtor &&
+            ('constructor' in object && 'constructor' in other) &&
+            !(typeof objCtor == 'function' && objCtor instanceof objCtor &&
+              typeof othCtor == 'function' && othCtor instanceof othCtor)) {
+          result = false;
+        }
+      }
+      stack['delete'](object);
+      stack['delete'](other);
+      return result;
+    }
+
+    /**
+     * A specialized version of `baseRest` which flattens the rest array.
+     *
+     * @private
+     * @param {Function} func The function to apply a rest parameter to.
+     * @returns {Function} Returns the new function.
+     */
+    function flatRest(func) {
+      return setToString(overRest(func, undefined, flatten), func + '');
+    }
+
+    /**
+     * Creates an array of own enumerable property names and symbols of `object`.
+     *
+     * @private
+     * @param {Object} object The object to query.
+     * @returns {Array} Returns the array of property names and symbols.
+     */
+    function getAllKeys(object) {
+      return baseGetAllKeys(object, keys, getSymbols);
+    }
+
+    /**
+     * Creates an array of own and inherited enumerable property names and
+     * symbols of `object`.
+     *
+     * @private
+     * @param {Object} object The object to query.
+     * @returns {Array} Returns the array of property names and symbols.
+     */
+    function getAllKeysIn(object) {
+      return baseGetAllKeys(object, keysIn, getSymbolsIn);
+    }
+
+    /**
+     * Gets metadata for `func`.
+     *
+     * @private
+     * @param {Function} func The function to query.
+     * @returns {*} Returns the metadata for `func`.
+     */
+    var getData = !metaMap ? noop : function(func) {
+      return metaMap.get(func);
+    };
+
+    /**
+     * Gets the name of `func`.
+     *
+     * @private
+     * @param {Function} func The function to query.
+     * @returns {string} Returns the function name.
+     */
+    function getFuncName(func) {
+      var result = (func.name + ''),
+          array = realNames[result],
+          length = hasOwnProperty.call(realNames, result) ? array.length : 0;
+
+      while (length--) {
+        var data = array[length],
+            otherFunc = data.func;
+        if (otherFunc == null || otherFunc == func) {
+          return data.name;
+        }
+      }
+      return result;
+    }
+
+    /**
+     * Gets the argument placeholder value for `func`.
+     *
+     * @private
+     * @param {Function} func The function to inspect.
+     * @returns {*} Returns the placeholder value.
+     */
+    function getHolder(func) {
+      var object = hasOwnProperty.call(lodash, 'placeholder') ? lodash : func;
+      return object.placeholder;
+    }
+
+    /**
+     * Gets the appropriate "iteratee" function. If `_.iteratee` is customized,
+     * this function returns the custom method, otherwise it returns `baseIteratee`.
+     * If arguments are provided, the chosen function is invoked with them and
+     * its result is returned.
+     *
+     * @private
+     * @param {*} [value] The value to convert to an iteratee.
+     * @param {number} [arity] The arity of the created iteratee.
+     * @returns {Function} Returns the chosen function or its result.
+     */
+    function getIteratee() {
+      var result = lodash.iteratee || iteratee;
+      result = result === iteratee ? baseIteratee : result;
+      return arguments.length ? result(arguments[0], arguments[1]) : result;
+    }
+
+    /**
+     * Gets the data for `map`.
+     *
+     * @private
+     * @param {Object} map The map to query.
+     * @param {string} key The reference key.
+     * @returns {*} Returns the map data.
+     */
+    function getMapData(map, key) {
+      var data = map.__data__;
+      return isKeyable(key)
+        ? data[typeof key == 'string' ? 'string' : 'hash']
+        : data.map;
+    }
+
+    /**
+     * Gets the property names, values, and compare flags of `object`.
+     *
+     * @private
+     * @param {Object} object The object to query.
+     * @returns {Array} Returns the match data of `object`.
+     */
+    function getMatchData(object) {
+      var result = keys(object),
+          length = result.length;
+
+      while (length--) {
+        var key = result[length],
+            value = object[key];
+
+        result[length] = [key, value, isStrictComparable(value)];
+      }
+      return result;
+    }
+
+    /**
+     * Gets the native function at `key` of `object`.
+     *
+     * @private
+     * @param {Object} object The object to query.
+     * @param {string} key The key of the method to get.
+     * @returns {*} Returns the function if it's native, else `undefined`.
+     */
+    function getNative(object, key) {
+      var value = getValue(object, key);
+      return baseIsNative(value) ? value : undefined;
+    }
+
+    /**
+     * A specialized version of `baseGetTag` which ignores `Symbol.toStringTag` values.
+     *
+     * @private
+     * @param {*} value The value to query.
+     * @returns {string} Returns the raw `toStringTag`.
+     */
+    function getRawTag(value) {
+      var isOwn = hasOwnProperty.call(value, symToStringTag),
+          tag = value[symToStringTag];
+
+      try {
+        value[symToStringTag] = undefined;
+        var unmasked = true;
+      } catch (e) {}
+
+      var result = nativeObjectToString.call(value);
+      if (unmasked) {
+        if (isOwn) {
+          value[symToStringTag] = tag;
+        } else {
+          delete value[symToStringTag];
+        }
+      }
+      return result;
+    }
+
+    /**
+     * Creates an array of the own enumerable symbols of `object`.
+     *
+     * @private
+     * @param {Object} object The object to query.
+     * @returns {Array} Returns the array of symbols.
+     */
+    var getSymbols = !nativeGetSymbols ? stubArray : function(object) {
+      if (object == null) {
+        return [];
+      }
+      object = Object(object);
+      return arrayFilter(nativeGetSymbols(object), function(symbol) {
+        return propertyIsEnumerable.call(object, symbol);
+      });
+    };
+
+    /**
+     * Creates an array of the own and inherited enumerable symbols of `object`.
+     *
+     * @private
+     * @param {Object} object The object to query.
+     * @returns {Array} Returns the array of symbols.
+     */
+    var getSymbolsIn = !nativeGetSymbols ? stubArray : function(object) {
+      var result = [];
+      while (object) {
+        arrayPush(result, getSymbols(object));
+        object = getPrototype(object);
+      }
+      return result;
+    };
+
+    /**
+     * Gets the `toStringTag` of `value`.
+     *
+     * @private
+     * @param {*} value The value to query.
+     * @returns {string} Returns the `toStringTag`.
+     */
+    var getTag = baseGetTag;
+
+    // Fallback for data views, maps, sets, and weak maps in IE 11 and promises in Node.js < 6.
+    if ((DataView && getTag(new DataView(new ArrayBuffer(1))) != dataViewTag) ||
+        (Map && getTag(new Map) != mapTag) ||
+        (Promise && getTag(Promise.resolve()) != promiseTag) ||
+        (Set && getTag(new Set) != setTag) ||
+        (WeakMap && getTag(new WeakMap) != weakMapTag)) {
+      getTag = function(value) {
+        var result = baseGetTag(value),
+            Ctor = result == objectTag ? value.constructor : undefined,
+            ctorString = Ctor ? toSource(Ctor) : '';
+
+        if (ctorString) {
+          switch (ctorString) {
+            case dataViewCtorString: return dataViewTag;
+            case mapCtorString: return mapTag;
+            case promiseCtorString: return promiseTag;
+            case setCtorString: return setTag;
+            case weakMapCtorString: return weakMapTag;
+          }
+        }
+        return result;
+      };
+    }
+
+    /**
+     * Gets the view, applying any `transforms` to the `start` and `end` positions.
+     *
+     * @private
+     * @param {number} start The start of the view.
+     * @param {number} end The end of the view.
+     * @param {Array} transforms The transformations to apply to the view.
+     * @returns {Object} Returns an object containing the `start` and `end`
+     *  positions of the view.
+     */
+    function getView(start, end, transforms) {
+      var index = -1,
+          length = transforms.length;
+
+      while (++index < length) {
+        var data = transforms[index],
+            size = data.size;
+
+        switch (data.type) {
+          case 'drop':      start += size; break;
+          case 'dropRight': end -= size; break;
+          case 'take':      end = nativeMin(end, start + size); break;
+          case 'takeRight': start = nativeMax(start, end - size); break;
+        }
+      }
+      return { 'start': start, 'end': end };
+    }
+
+    /**
+     * Extracts wrapper details from the `source` body comment.
+     *
+     * @private
+     * @param {string} source The source to inspect.
+     * @returns {Array} Returns the wrapper details.
+     */
+    function getWrapDetails(source) {
+      var match = source.match(reWrapDetails);
+      return match ? match[1].split(reSplitDetails) : [];
+    }
+
+    /**
+     * Checks if `path` exists on `object`.
+     *
+     * @private
+     * @param {Object} object The object to query.
+     * @param {Array|string} path The path to check.
+     * @param {Function} hasFunc The function to check properties.
+     * @returns {boolean} Returns `true` if `path` exists, else `false`.
+     */
+    function hasPath(object, path, hasFunc) {
+      path = castPath(path, object);
+
+      var index = -1,
+          length = path.length,
+          result = false;
+
+      while (++index < length) {
+        var key = toKey(path[index]);
+        if (!(result = object != null && hasFunc(object, key))) {
+          break;
+        }
+        object = object[key];
+      }
+      if (result || ++index != length) {
+        return result;
+      }
+      length = object == null ? 0 : object.length;
+      return !!length && isLength(length) && isIndex(key, length) &&
+        (isArray(object) || isArguments(object));
+    }
+
+    /**
+     * Initializes an array clone.
+     *
+     * @private
+     * @param {Array} array The array to clone.
+     * @returns {Array} Returns the initialized clone.
+     */
+    function initCloneArray(array) {
+      var length = array.length,
+          result = new array.constructor(length);
+
+      // Add properties assigned by `RegExp#exec`.
+      if (length && typeof array[0] == 'string' && hasOwnProperty.call(array, 'index')) {
+        result.index = array.index;
+        result.input = array.input;
+      }
+      return result;
+    }
+
+    /**
+     * Initializes an object clone.
+     *
+     * @private
+     * @param {Object} object The object to clone.
+     * @returns {Object} Returns the initialized clone.
+     */
+    function initCloneObject(object) {
+      return (typeof object.constructor == 'function' && !isPrototype(object))
+        ? baseCreate(getPrototype(object))
+        : {};
+    }
+
+    /**
+     * Initializes an object clone based on its `toStringTag`.
+     *
+     * **Note:** This function only supports cloning values with tags of
+     * `Boolean`, `Date`, `Error`, `Map`, `Number`, `RegExp`, `Set`, or `String`.
+     *
+     * @private
+     * @param {Object} object The object to clone.
+     * @param {string} tag The `toStringTag` of the object to clone.
+     * @param {boolean} [isDeep] Specify a deep clone.
+     * @returns {Object} Returns the initialized clone.
+     */
+    function initCloneByTag(object, tag, isDeep) {
+      var Ctor = object.constructor;
+      switch (tag) {
+        case arrayBufferTag:
+          return cloneArrayBuffer(object);
+
+        case boolTag:
+        case dateTag:
+          return new Ctor(+object);
+
+        case dataViewTag:
+          return cloneDataView(object, isDeep);
+
+        case float32Tag: case float64Tag:
+        case int8Tag: case int16Tag: case int32Tag:
+        case uint8Tag: case uint8ClampedTag: case uint16Tag: case uint32Tag:
+          return cloneTypedArray(object, isDeep);
+
+        case mapTag:
+          return new Ctor;
+
+        case numberTag:
+        case stringTag:
+          return new Ctor(object);
+
+        case regexpTag:
+          return cloneRegExp(object);
+
+        case setTag:
+          return new Ctor;
+
+        case symbolTag:
+          return cloneSymbol(object);
+      }
+    }
+
+    /**
+     * Inserts wrapper `details` in a comment at the top of the `source` body.
+     *
+     * @private
+     * @param {string} source The source to modify.
+     * @returns {Array} details The details to insert.
+     * @returns {string} Returns the modified source.
+     */
+    function insertWrapDetails(source, details) {
+      var length = details.length;
+      if (!length) {
+        return source;
+      }
+      var lastIndex = length - 1;
+      details[lastIndex] = (length > 1 ? '& ' : '') + details[lastIndex];
+      details = details.join(length > 2 ? ', ' : ' ');
+      return source.replace(reWrapComment, '{\n/* [wrapped with ' + details + '] */\n');
+    }
+
+    /**
+     * Checks if `value` is a flattenable `arguments` object or array.
+     *
+     * @private
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is flattenable, else `false`.
+     */
+    function isFlattenable(value) {
+      return isArray(value) || isArguments(value) ||
+        !!(spreadableSymbol && value && value[spreadableSymbol]);
+    }
+
+    /**
+     * Checks if `value` is a valid array-like index.
+     *
+     * @private
+     * @param {*} value The value to check.
+     * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
+     * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
+     */
+    function isIndex(value, length) {
+      var type = typeof value;
+      length = length == null ? MAX_SAFE_INTEGER : length;
+
+      return !!length &&
+        (type == 'number' ||
+          (type != 'symbol' && reIsUint.test(value))) &&
+            (value > -1 && value % 1 == 0 && value < length);
+    }
+
+    /**
+     * Checks if the given arguments are from an iteratee call.
+     *
+     * @private
+     * @param {*} value The potential iteratee value argument.
+     * @param {*} index The potential iteratee index or key argument.
+     * @param {*} object The potential iteratee object argument.
+     * @returns {boolean} Returns `true` if the arguments are from an iteratee call,
+     *  else `false`.
+     */
+    function isIterateeCall(value, index, object) {
+      if (!isObject(object)) {
+        return false;
+      }
+      var type = typeof index;
+      if (type == 'number'
+            ? (isArrayLike(object) && isIndex(index, object.length))
+            : (type == 'string' && index in object)
+          ) {
+        return eq(object[index], value);
+      }
+      return false;
+    }
+
+    /**
+     * Checks if `value` is a property name and not a property path.
+     *
+     * @private
+     * @param {*} value The value to check.
+     * @param {Object} [object] The object to query keys on.
+     * @returns {boolean} Returns `true` if `value` is a property name, else `false`.
+     */
+    function isKey(value, object) {
+      if (isArray(value)) {
+        return false;
+      }
+      var type = typeof value;
+      if (type == 'number' || type == 'symbol' || type == 'boolean' ||
+          value == null || isSymbol(value)) {
+        return true;
+      }
+      return reIsPlainProp.test(value) || !reIsDeepProp.test(value) ||
+        (object != null && value in Object(object));
+    }
+
+    /**
+     * Checks if `value` is suitable for use as unique object key.
+     *
+     * @private
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is suitable, else `false`.
+     */
+    function isKeyable(value) {
+      var type = typeof value;
+      return (type == 'string' || type == 'number' || type == 'symbol' || type == 'boolean')
+        ? (value !== '__proto__')
+        : (value === null);
+    }
+
+    /**
+     * Checks if `func` has a lazy counterpart.
+     *
+     * @private
+     * @param {Function} func The function to check.
+     * @returns {boolean} Returns `true` if `func` has a lazy counterpart,
+     *  else `false`.
+     */
+    function isLaziable(func) {
+      var funcName = getFuncName(func),
+          other = lodash[funcName];
+
+      if (typeof other != 'function' || !(funcName in LazyWrapper.prototype)) {
+        return false;
+      }
+      if (func === other) {
+        return true;
+      }
+      var data = getData(other);
+      return !!data && func === data[0];
+    }
+
+    /**
+     * Checks if `func` has its source masked.
+     *
+     * @private
+     * @param {Function} func The function to check.
+     * @returns {boolean} Returns `true` if `func` is masked, else `false`.
+     */
+    function isMasked(func) {
+      return !!maskSrcKey && (maskSrcKey in func);
+    }
+
+    /**
+     * Checks if `func` is capable of being masked.
+     *
+     * @private
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `func` is maskable, else `false`.
+     */
+    var isMaskable = coreJsData ? isFunction : stubFalse;
+
+    /**
+     * Checks if `value` is likely a prototype object.
+     *
+     * @private
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a prototype, else `false`.
+     */
+    function isPrototype(value) {
+      var Ctor = value && value.constructor,
+          proto = (typeof Ctor == 'function' && Ctor.prototype) || objectProto;
+
+      return value === proto;
+    }
+
+    /**
+     * Checks if `value` is suitable for strict equality comparisons, i.e. `===`.
+     *
+     * @private
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` if suitable for strict
+     *  equality comparisons, else `false`.
+     */
+    function isStrictComparable(value) {
+      return value === value && !isObject(value);
+    }
+
+    /**
+     * A specialized version of `matchesProperty` for source values suitable
+     * for strict equality comparisons, i.e. `===`.
+     *
+     * @private
+     * @param {string} key The key of the property to get.
+     * @param {*} srcValue The value to match.
+     * @returns {Function} Returns the new spec function.
+     */
+    function matchesStrictComparable(key, srcValue) {
+      return function(object) {
+        if (object == null) {
+          return false;
+        }
+        return object[key] === srcValue &&
+          (srcValue !== undefined || (key in Object(object)));
+      };
+    }
+
+    /**
+     * A specialized version of `_.memoize` which clears the memoized function's
+     * cache when it exceeds `MAX_MEMOIZE_SIZE`.
+     *
+     * @private
+     * @param {Function} func The function to have its output memoized.
+     * @returns {Function} Returns the new memoized function.
+     */
+    function memoizeCapped(func) {
+      var result = memoize(func, function(key) {
+        if (cache.size === MAX_MEMOIZE_SIZE) {
+          cache.clear();
+        }
+        return key;
+      });
+
+      var cache = result.cache;
+      return result;
+    }
+
+    /**
+     * Merges the function metadata of `source` into `data`.
+     *
+     * Merging metadata reduces the number of wrappers used to invoke a function.
+     * This is possible because methods like `_.bind`, `_.curry`, and `_.partial`
+     * may be applied regardless of execution order. Methods like `_.ary` and
+     * `_.rearg` modify function arguments, making the order in which they are
+     * executed important, preventing the merging of metadata. However, we make
+     * an exception for a safe combined case where curried functions have `_.ary`
+     * and or `_.rearg` applied.
+     *
+     * @private
+     * @param {Array} data The destination metadata.
+     * @param {Array} source The source metadata.
+     * @returns {Array} Returns `data`.
+     */
+    function mergeData(data, source) {
+      var bitmask = data[1],
+          srcBitmask = source[1],
+          newBitmask = bitmask | srcBitmask,
+          isCommon = newBitmask < (WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG | WRAP_ARY_FLAG);
+
+      var isCombo =
+        ((srcBitmask == WRAP_ARY_FLAG) && (bitmask == WRAP_CURRY_FLAG)) ||
+        ((srcBitmask == WRAP_ARY_FLAG) && (bitmask == WRAP_REARG_FLAG) && (data[7].length <= source[8])) ||
+        ((srcBitmask == (WRAP_ARY_FLAG | WRAP_REARG_FLAG)) && (source[7].length <= source[8]) && (bitmask == WRAP_CURRY_FLAG));
+
+      // Exit early if metadata can't be merged.
+      if (!(isCommon || isCombo)) {
+        return data;
+      }
+      // Use source `thisArg` if available.
+      if (srcBitmask & WRAP_BIND_FLAG) {
+        data[2] = source[2];
+        // Set when currying a bound function.
+        newBitmask |= bitmask & WRAP_BIND_FLAG ? 0 : WRAP_CURRY_BOUND_FLAG;
+      }
+      // Compose partial arguments.
+      var value = source[3];
+      if (value) {
+        var partials = data[3];
+        data[3] = partials ? composeArgs(partials, value, source[4]) : value;
+        data[4] = partials ? replaceHolders(data[3], PLACEHOLDER) : source[4];
+      }
+      // Compose partial right arguments.
+      value = source[5];
+      if (value) {
+        partials = data[5];
+        data[5] = partials ? composeArgsRight(partials, value, source[6]) : value;
+        data[6] = partials ? replaceHolders(data[5], PLACEHOLDER) : source[6];
+      }
+      // Use source `argPos` if available.
+      value = source[7];
+      if (value) {
+        data[7] = value;
+      }
+      // Use source `ary` if it's smaller.
+      if (srcBitmask & WRAP_ARY_FLAG) {
+        data[8] = data[8] == null ? source[8] : nativeMin(data[8], source[8]);
+      }
+      // Use source `arity` if one is not provided.
+      if (data[9] == null) {
+        data[9] = source[9];
+      }
+      // Use source `func` and merge bitmasks.
+      data[0] = source[0];
+      data[1] = newBitmask;
+
+      return data;
+    }
+
+    /**
+     * This function is like
+     * [`Object.keys`](http://ecma-international.org/ecma-262/7.0/#sec-object.keys)
+     * except that it includes inherited enumerable properties.
+     *
+     * @private
+     * @param {Object} object The object to query.
+     * @returns {Array} Returns the array of property names.
+     */
+    function nativeKeysIn(object) {
+      var result = [];
+      if (object != null) {
+        for (var key in Object(object)) {
+          result.push(key);
+        }
+      }
+      return result;
+    }
+
+    /**
+     * Converts `value` to a string using `Object.prototype.toString`.
+     *
+     * @private
+     * @param {*} value The value to convert.
+     * @returns {string} Returns the converted string.
+     */
+    function objectToString(value) {
+      return nativeObjectToString.call(value);
+    }
+
+    /**
+     * A specialized version of `baseRest` which transforms the rest array.
+     *
+     * @private
+     * @param {Function} func The function to apply a rest parameter to.
+     * @param {number} [start=func.length-1] The start position of the rest parameter.
+     * @param {Function} transform The rest array transform.
+     * @returns {Function} Returns the new function.
+     */
+    function overRest(func, start, transform) {
+      start = nativeMax(start === undefined ? (func.length - 1) : start, 0);
+      return function() {
+        var args = arguments,
+            index = -1,
+            length = nativeMax(args.length - start, 0),
+            array = Array(length);
+
+        while (++index < length) {
+          array[index] = args[start + index];
+        }
+        index = -1;
+        var otherArgs = Array(start + 1);
+        while (++index < start) {
+          otherArgs[index] = args[index];
+        }
+        otherArgs[start] = transform(array);
+        return apply(func, this, otherArgs);
+      };
+    }
+
+    /**
+     * Gets the parent value at `path` of `object`.
+     *
+     * @private
+     * @param {Object} object The object to query.
+     * @param {Array} path The path to get the parent value of.
+     * @returns {*} Returns the parent value.
+     */
+    function parent(object, path) {
+      return path.length < 2 ? object : baseGet(object, baseSlice(path, 0, -1));
+    }
+
+    /**
+     * Reorder `array` according to the specified indexes where the element at
+     * the first index is assigned as the first element, the element at
+     * the second index is assigned as the second element, and so on.
+     *
+     * @private
+     * @param {Array} array The array to reorder.
+     * @param {Array} indexes The arranged array indexes.
+     * @returns {Array} Returns `array`.
+     */
+    function reorder(array, indexes) {
+      var arrLength = array.length,
+          length = nativeMin(indexes.length, arrLength),
+          oldArray = copyArray(array);
+
+      while (length--) {
+        var index = indexes[length];
+        array[length] = isIndex(index, arrLength) ? oldArray[index] : undefined;
+      }
+      return array;
+    }
+
+    /**
+     * Gets the value at `key`, unless `key` is "__proto__" or "constructor".
+     *
+     * @private
+     * @param {Object} object The object to query.
+     * @param {string} key The key of the property to get.
+     * @returns {*} Returns the property value.
+     */
+    function safeGet(object, key) {
+      if (key === 'constructor' && typeof object[key] === 'function') {
+        return;
+      }
+
+      if (key == '__proto__') {
+        return;
+      }
+
+      return object[key];
+    }
+
+    /**
+     * Sets metadata for `func`.
+     *
+     * **Note:** If this function becomes hot, i.e. is invoked a lot in a short
+     * period of time, it will trip its breaker and transition to an identity
+     * function to avoid garbage collection pauses in V8. See
+     * [V8 issue 2070](https://bugs.chromium.org/p/v8/issues/detail?id=2070)
+     * for more details.
+     *
+     * @private
+     * @param {Function} func The function to associate metadata with.
+     * @param {*} data The metadata.
+     * @returns {Function} Returns `func`.
+     */
+    var setData = shortOut(baseSetData);
+
+    /**
+     * A simple wrapper around the global [`setTimeout`](https://mdn.io/setTimeout).
+     *
+     * @private
+     * @param {Function} func The function to delay.
+     * @param {number} wait The number of milliseconds to delay invocation.
+     * @returns {number|Object} Returns the timer id or timeout object.
+     */
+    var setTimeout = ctxSetTimeout || function(func, wait) {
+      return root.setTimeout(func, wait);
+    };
+
+    /**
+     * Sets the `toString` method of `func` to return `string`.
+     *
+     * @private
+     * @param {Function} func The function to modify.
+     * @param {Function} string The `toString` result.
+     * @returns {Function} Returns `func`.
+     */
+    var setToString = shortOut(baseSetToString);
+
+    /**
+     * Sets the `toString` method of `wrapper` to mimic the source of `reference`
+     * with wrapper details in a comment at the top of the source body.
+     *
+     * @private
+     * @param {Function} wrapper The function to modify.
+     * @param {Function} reference The reference function.
+     * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
+     * @returns {Function} Returns `wrapper`.
+     */
+    function setWrapToString(wrapper, reference, bitmask) {
+      var source = (reference + '');
+      return setToString(wrapper, insertWrapDetails(source, updateWrapDetails(getWrapDetails(source), bitmask)));
+    }
+
+    /**
+     * Creates a function that'll short out and invoke `identity` instead
+     * of `func` when it's called `HOT_COUNT` or more times in `HOT_SPAN`
+     * milliseconds.
+     *
+     * @private
+     * @param {Function} func The function to restrict.
+     * @returns {Function} Returns the new shortable function.
+     */
+    function shortOut(func) {
+      var count = 0,
+          lastCalled = 0;
+
+      return function() {
+        var stamp = nativeNow(),
+            remaining = HOT_SPAN - (stamp - lastCalled);
+
+        lastCalled = stamp;
+        if (remaining > 0) {
+          if (++count >= HOT_COUNT) {
+            return arguments[0];
+          }
+        } else {
+          count = 0;
+        }
+        return func.apply(undefined, arguments);
+      };
+    }
+
+    /**
+     * A specialized version of `_.shuffle` which mutates and sets the size of `array`.
+     *
+     * @private
+     * @param {Array} array The array to shuffle.
+     * @param {number} [size=array.length] The size of `array`.
+     * @returns {Array} Returns `array`.
+     */
+    function shuffleSelf(array, size) {
+      var index = -1,
+          length = array.length,
+          lastIndex = length - 1;
+
+      size = size === undefined ? length : size;
+      while (++index < size) {
+        var rand = baseRandom(index, lastIndex),
+            value = array[rand];
+
+        array[rand] = array[index];
+        array[index] = value;
+      }
+      array.length = size;
+      return array;
+    }
+
+    /**
+     * Converts `string` to a property path array.
+     *
+     * @private
+     * @param {string} string The string to convert.
+     * @returns {Array} Returns the property path array.
+     */
+    var stringToPath = memoizeCapped(function(string) {
+      var result = [];
+      if (string.charCodeAt(0) === 46 /* . */) {
+        result.push('');
+      }
+      string.replace(rePropName, function(match, number, quote, subString) {
+        result.push(quote ? subString.replace(reEscapeChar, '$1') : (number || match));
+      });
+      return result;
+    });
+
+    /**
+     * Converts `value` to a string key if it's not a string or symbol.
+     *
+     * @private
+     * @param {*} value The value to inspect.
+     * @returns {string|symbol} Returns the key.
+     */
+    function toKey(value) {
+      if (typeof value == 'string' || isSymbol(value)) {
+        return value;
+      }
+      var result = (value + '');
+      return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
+    }
+
+    /**
+     * Converts `func` to its source code.
+     *
+     * @private
+     * @param {Function} func The function to convert.
+     * @returns {string} Returns the source code.
+     */
+    function toSource(func) {
+      if (func != null) {
+        try {
+          return funcToString.call(func);
+        } catch (e) {}
+        try {
+          return (func + '');
+        } catch (e) {}
+      }
+      return '';
+    }
+
+    /**
+     * Updates wrapper `details` based on `bitmask` flags.
+     *
+     * @private
+     * @returns {Array} details The details to modify.
+     * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
+     * @returns {Array} Returns `details`.
+     */
+    function updateWrapDetails(details, bitmask) {
+      arrayEach(wrapFlags, function(pair) {
+        var value = '_.' + pair[0];
+        if ((bitmask & pair[1]) && !arrayIncludes(details, value)) {
+          details.push(value);
+        }
+      });
+      return details.sort();
+    }
+
+    /**
+     * Creates a clone of `wrapper`.
+     *
+     * @private
+     * @param {Object} wrapper The wrapper to clone.
+     * @returns {Object} Returns the cloned wrapper.
+     */
+    function wrapperClone(wrapper) {
+      if (wrapper instanceof LazyWrapper) {
+        return wrapper.clone();
+      }
+      var result = new LodashWrapper(wrapper.__wrapped__, wrapper.__chain__);
+      result.__actions__ = copyArray(wrapper.__actions__);
+      result.__index__  = wrapper.__index__;
+      result.__values__ = wrapper.__values__;
+      return result;
+    }
+
+    /*------------------------------------------------------------------------*/
+
+    /**
+     * Creates an array of elements split into groups the length of `size`.
+     * If `array` can't be split evenly, the final chunk will be the remaining
+     * elements.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category Array
+     * @param {Array} array The array to process.
+     * @param {number} [size=1] The length of each chunk
+     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
+     * @returns {Array} Returns the new array of chunks.
+     * @example
+     *
+     * _.chunk(['a', 'b', 'c', 'd'], 2);
+     * // => [['a', 'b'], ['c', 'd']]
+     *
+     * _.chunk(['a', 'b', 'c', 'd'], 3);
+     * // => [['a', 'b', 'c'], ['d']]
+     */
+    function chunk(array, size, guard) {
+      if ((guard ? isIterateeCall(array, size, guard) : size === undefined)) {
+        size = 1;
+      } else {
+        size = nativeMax(toInteger(size), 0);
+      }
+      var length = array == null ? 0 : array.length;
+      if (!length || size < 1) {
+        return [];
+      }
+      var index = 0,
+          resIndex = 0,
+          result = Array(nativeCeil(length / size));
+
+      while (index < length) {
+        result[resIndex++] = baseSlice(array, index, (index += size));
+      }
+      return result;
+    }
+
+    /**
+     * Creates an array with all falsey values removed. The values `false`, `null`,
+     * `0`, `""`, `undefined`, and `NaN` are falsey.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Array
+     * @param {Array} array The array to compact.
+     * @returns {Array} Returns the new array of filtered values.
+     * @example
+     *
+     * _.compact([0, 1, false, 2, '', 3]);
+     * // => [1, 2, 3]
+     */
+    function compact(array) {
+      var index = -1,
+          length = array == null ? 0 : array.length,
+          resIndex = 0,
+          result = [];
+
+      while (++index < length) {
+        var value = array[index];
+        if (value) {
+          result[resIndex++] = value;
+        }
+      }
+      return result;
+    }
+
+    /**
+     * Creates a new array concatenating `array` with any additional arrays
+     * and/or values.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Array
+     * @param {Array} array The array to concatenate.
+     * @param {...*} [values] The values to concatenate.
+     * @returns {Array} Returns the new concatenated array.
+     * @example
+     *
+     * var array = [1];
+     * var other = _.concat(array, 2, [3], [[4]]);
+     *
+     * console.log(other);
+     * // => [1, 2, 3, [4]]
+     *
+     * console.log(array);
+     * // => [1]
+     */
+    function concat() {
+      var length = arguments.length;
+      if (!length) {
+        return [];
+      }
+      var args = Array(length - 1),
+          array = arguments[0],
+          index = length;
+
+      while (index--) {
+        args[index - 1] = arguments[index];
+      }
+      return arrayPush(isArray(array) ? copyArray(array) : [array], baseFlatten(args, 1));
+    }
+
+    /**
+     * Creates an array of `array` values not included in the other given arrays
+     * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
+     * for equality comparisons. The order and references of result values are
+     * determined by the first array.
+     *
+     * **Note:** Unlike `_.pullAll`, this method returns a new array.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Array
+     * @param {Array} array The array to inspect.
+     * @param {...Array} [values] The values to exclude.
+     * @returns {Array} Returns the new array of filtered values.
+     * @see _.without, _.xor
+     * @example
+     *
+     * _.difference([2, 1], [2, 3]);
+     * // => [1]
+     */
+    var difference = baseRest(function(array, values) {
+      return isArrayLikeObject(array)
+        ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true))
+        : [];
+    });
+
+    /**
+     * This method is like `_.difference` except that it accepts `iteratee` which
+     * is invoked for each element of `array` and `values` to generate the criterion
+     * by which they're compared. The order and references of result values are
+     * determined by the first array. The iteratee is invoked with one argument:
+     * (value).
+     *
+     * **Note:** Unlike `_.pullAllBy`, this method returns a new array.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Array
+     * @param {Array} array The array to inspect.
+     * @param {...Array} [values] The values to exclude.
+     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
+     * @returns {Array} Returns the new array of filtered values.
+     * @example
+     *
+     * _.differenceBy([2.1, 1.2], [2.3, 3.4], Math.floor);
+     * // => [1.2]
+     *
+     * // The `_.property` iteratee shorthand.
+     * _.differenceBy([{ 'x': 2 }, { 'x': 1 }], [{ 'x': 1 }], 'x');
+     * // => [{ 'x': 2 }]
+     */
+    var differenceBy = baseRest(function(array, values) {
+      var iteratee = last(values);
+      if (isArrayLikeObject(iteratee)) {
+        iteratee = undefined;
+      }
+      return isArrayLikeObject(array)
+        ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true), getIteratee(iteratee, 2))
+        : [];
+    });
+
+    /**
+     * This method is like `_.difference` except that it accepts `comparator`
+     * which is invoked to compare elements of `array` to `values`. The order and
+     * references of result values are determined by the first array. The comparator
+     * is invoked with two arguments: (arrVal, othVal).
+     *
+     * **Note:** Unlike `_.pullAllWith`, this method returns a new array.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Array
+     * @param {Array} array The array to inspect.
+     * @param {...Array} [values] The values to exclude.
+     * @param {Function} [comparator] The comparator invoked per element.
+     * @returns {Array} Returns the new array of filtered values.
+     * @example
+     *
+     * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
+     *
+     * _.differenceWith(objects, [{ 'x': 1, 'y': 2 }], _.isEqual);
+     * // => [{ 'x': 2, 'y': 1 }]
+     */
+    var differenceWith = baseRest(function(array, values) {
+      var comparator = last(values);
+      if (isArrayLikeObject(comparator)) {
+        comparator = undefined;
+      }
+      return isArrayLikeObject(array)
+        ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true), undefined, comparator)
+        : [];
+    });
+
+    /**
+     * Creates a slice of `array` with `n` elements dropped from the beginning.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.5.0
+     * @category Array
+     * @param {Array} array The array to query.
+     * @param {number} [n=1] The number of elements to drop.
+     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
+     * @returns {Array} Returns the slice of `array`.
+     * @example
+     *
+     * _.drop([1, 2, 3]);
+     * // => [2, 3]
+     *
+     * _.drop([1, 2, 3], 2);
+     * // => [3]
+     *
+     * _.drop([1, 2, 3], 5);
+     * // => []
+     *
+     * _.drop([1, 2, 3], 0);
+     * // => [1, 2, 3]
+     */
+    function drop(array, n, guard) {
+      var length = array == null ? 0 : array.length;
+      if (!length) {
+        return [];
+      }
+      n = (guard || n === undefined) ? 1 : toInteger(n);
+      return baseSlice(array, n < 0 ? 0 : n, length);
+    }
+
+    /**
+     * Creates a slice of `array` with `n` elements dropped from the end.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category Array
+     * @param {Array} array The array to query.
+     * @param {number} [n=1] The number of elements to drop.
+     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
+     * @returns {Array} Returns the slice of `array`.
+     * @example
+     *
+     * _.dropRight([1, 2, 3]);
+     * // => [1, 2]
+     *
+     * _.dropRight([1, 2, 3], 2);
+     * // => [1]
+     *
+     * _.dropRight([1, 2, 3], 5);
+     * // => []
+     *
+     * _.dropRight([1, 2, 3], 0);
+     * // => [1, 2, 3]
+     */
+    function dropRight(array, n, guard) {
+      var length = array == null ? 0 : array.length;
+      if (!length) {
+        return [];
+      }
+      n = (guard || n === undefined) ? 1 : toInteger(n);
+      n = length - n;
+      return baseSlice(array, 0, n < 0 ? 0 : n);
+    }
+
+    /**
+     * Creates a slice of `array` excluding elements dropped from the end.
+     * Elements are dropped until `predicate` returns falsey. The predicate is
+     * invoked with three arguments: (value, index, array).
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category Array
+     * @param {Array} array The array to query.
+     * @param {Function} [predicate=_.identity] The function invoked per iteration.
+     * @returns {Array} Returns the slice of `array`.
+     * @example
+     *
+     * var users = [
+     *   { 'user': 'barney',  'active': true },
+     *   { 'user': 'fred',    'active': false },
+     *   { 'user': 'pebbles', 'active': false }
+     * ];
+     *
+     * _.dropRightWhile(users, function(o) { return !o.active; });
+     * // => objects for ['barney']
+     *
+     * // The `_.matches` iteratee shorthand.
+     * _.dropRightWhile(users, { 'user': 'pebbles', 'active': false });
+     * // => objects for ['barney', 'fred']
+     *
+     * // The `_.matchesProperty` iteratee shorthand.
+     * _.dropRightWhile(users, ['active', false]);
+     * // => objects for ['barney']
+     *
+     * // The `_.property` iteratee shorthand.
+     * _.dropRightWhile(users, 'active');
+     * // => objects for ['barney', 'fred', 'pebbles']
+     */
+    function dropRightWhile(array, predicate) {
+      return (array && array.length)
+        ? baseWhile(array, getIteratee(predicate, 3), true, true)
+        : [];
+    }
+
+    /**
+     * Creates a slice of `array` excluding elements dropped from the beginning.
+     * Elements are dropped until `predicate` returns falsey. The predicate is
+     * invoked with three arguments: (value, index, array).
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category Array
+     * @param {Array} array The array to query.
+     * @param {Function} [predicate=_.identity] The function invoked per iteration.
+     * @returns {Array} Returns the slice of `array`.
+     * @example
+     *
+     * var users = [
+     *   { 'user': 'barney',  'active': false },
+     *   { 'user': 'fred',    'active': false },
+     *   { 'user': 'pebbles', 'active': true }
+     * ];
+     *
+     * _.dropWhile(users, function(o) { return !o.active; });
+     * // => objects for ['pebbles']
+     *
+     * // The `_.matches` iteratee shorthand.
+     * _.dropWhile(users, { 'user': 'barney', 'active': false });
+     * // => objects for ['fred', 'pebbles']
+     *
+     * // The `_.matchesProperty` iteratee shorthand.
+     * _.dropWhile(users, ['active', false]);
+     * // => objects for ['pebbles']
+     *
+     * // The `_.property` iteratee shorthand.
+     * _.dropWhile(users, 'active');
+     * // => objects for ['barney', 'fred', 'pebbles']
+     */
+    function dropWhile(array, predicate) {
+      return (array && array.length)
+        ? baseWhile(array, getIteratee(predicate, 3), true)
+        : [];
+    }
+
+    /**
+     * Fills elements of `array` with `value` from `start` up to, but not
+     * including, `end`.
+     *
+     * **Note:** This method mutates `array`.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.2.0
+     * @category Array
+     * @param {Array} array The array to fill.
+     * @param {*} value The value to fill `array` with.
+     * @param {number} [start=0] The start position.
+     * @param {number} [end=array.length] The end position.
+     * @returns {Array} Returns `array`.
+     * @example
+     *
+     * var array = [1, 2, 3];
+     *
+     * _.fill(array, 'a');
+     * console.log(array);
+     * // => ['a', 'a', 'a']
+     *
+     * _.fill(Array(3), 2);
+     * // => [2, 2, 2]
+     *
+     * _.fill([4, 6, 8, 10], '*', 1, 3);
+     * // => [4, '*', '*', 10]
+     */
+    function fill(array, value, start, end) {
+      var length = array == null ? 0 : array.length;
+      if (!length) {
+        return [];
+      }
+      if (start && typeof start != 'number' && isIterateeCall(array, value, start)) {
+        start = 0;
+        end = length;
+      }
+      return baseFill(array, value, start, end);
+    }
+
+    /**
+     * This method is like `_.find` except that it returns the index of the first
+     * element `predicate` returns truthy for instead of the element itself.
+     *
+     * @static
+     * @memberOf _
+     * @since 1.1.0
+     * @category Array
+     * @param {Array} array The array to inspect.
+     * @param {Function} [predicate=_.identity] The function invoked per iteration.
+     * @param {number} [fromIndex=0] The index to search from.
+     * @returns {number} Returns the index of the found element, else `-1`.
+     * @example
+     *
+     * var users = [
+     *   { 'user': 'barney',  'active': false },
+     *   { 'user': 'fred',    'active': false },
+     *   { 'user': 'pebbles', 'active': true }
+     * ];
+     *
+     * _.findIndex(users, function(o) { return o.user == 'barney'; });
+     * // => 0
+     *
+     * // The `_.matches` iteratee shorthand.
+     * _.findIndex(users, { 'user': 'fred', 'active': false });
+     * // => 1
+     *
+     * // The `_.matchesProperty` iteratee shorthand.
+     * _.findIndex(users, ['active', false]);
+     * // => 0
+     *
+     * // The `_.property` iteratee shorthand.
+     * _.findIndex(users, 'active');
+     * // => 2
+     */
+    function findIndex(array, predicate, fromIndex) {
+      var length = array == null ? 0 : array.length;
+      if (!length) {
+        return -1;
+      }
+      var index = fromIndex == null ? 0 : toInteger(fromIndex);
+      if (index < 0) {
+        index = nativeMax(length + index, 0);
+      }
+      return baseFindIndex(array, getIteratee(predicate, 3), index);
+    }
+
+    /**
+     * This method is like `_.findIndex` except that it iterates over elements
+     * of `collection` from right to left.
+     *
+     * @static
+     * @memberOf _
+     * @since 2.0.0
+     * @category Array
+     * @param {Array} array The array to inspect.
+     * @param {Function} [predicate=_.identity] The function invoked per iteration.
+     * @param {number} [fromIndex=array.length-1] The index to search from.
+     * @returns {number} Returns the index of the found element, else `-1`.
+     * @example
+     *
+     * var users = [
+     *   { 'user': 'barney',  'active': true },
+     *   { 'user': 'fred',    'active': false },
+     *   { 'user': 'pebbles', 'active': false }
+     * ];
+     *
+     * _.findLastIndex(users, function(o) { return o.user == 'pebbles'; });
+     * // => 2
+     *
+     * // The `_.matches` iteratee shorthand.
+     * _.findLastIndex(users, { 'user': 'barney', 'active': true });
+     * // => 0
+     *
+     * // The `_.matchesProperty` iteratee shorthand.
+     * _.findLastIndex(users, ['active', false]);
+     * // => 2
+     *
+     * // The `_.property` iteratee shorthand.
+     * _.findLastIndex(users, 'active');
+     * // => 0
+     */
+    function findLastIndex(array, predicate, fromIndex) {
+      var length = array == null ? 0 : array.length;
+      if (!length) {
+        return -1;
+      }
+      var index = length - 1;
+      if (fromIndex !== undefined) {
+        index = toInteger(fromIndex);
+        index = fromIndex < 0
+          ? nativeMax(length + index, 0)
+          : nativeMin(index, length - 1);
+      }
+      return baseFindIndex(array, getIteratee(predicate, 3), index, true);
+    }
+
+    /**
+     * Flattens `array` a single level deep.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Array
+     * @param {Array} array The array to flatten.
+     * @returns {Array} Returns the new flattened array.
+     * @example
+     *
+     * _.flatten([1, [2, [3, [4]], 5]]);
+     * // => [1, 2, [3, [4]], 5]
+     */
+    function flatten(array) {
+      var length = array == null ? 0 : array.length;
+      return length ? baseFlatten(array, 1) : [];
+    }
+
+    /**
+     * Recursively flattens `array`.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category Array
+     * @param {Array} array The array to flatten.
+     * @returns {Array} Returns the new flattened array.
+     * @example
+     *
+     * _.flattenDeep([1, [2, [3, [4]], 5]]);
+     * // => [1, 2, 3, 4, 5]
+     */
+    function flattenDeep(array) {
+      var length = array == null ? 0 : array.length;
+      return length ? baseFlatten(array, INFINITY) : [];
+    }
+
+    /**
+     * Recursively flatten `array` up to `depth` times.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.4.0
+     * @category Array
+     * @param {Array} array The array to flatten.
+     * @param {number} [depth=1] The maximum recursion depth.
+     * @returns {Array} Returns the new flattened array.
+     * @example
+     *
+     * var array = [1, [2, [3, [4]], 5]];
+     *
+     * _.flattenDepth(array, 1);
+     * // => [1, 2, [3, [4]], 5]
+     *
+     * _.flattenDepth(array, 2);
+     * // => [1, 2, 3, [4], 5]
+     */
+    function flattenDepth(array, depth) {
+      var length = array == null ? 0 : array.length;
+      if (!length) {
+        return [];
+      }
+      depth = depth === undefined ? 1 : toInteger(depth);
+      return baseFlatten(array, depth);
+    }
+
+    /**
+     * The inverse of `_.toPairs`; this method returns an object composed
+     * from key-value `pairs`.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Array
+     * @param {Array} pairs The key-value pairs.
+     * @returns {Object} Returns the new object.
+     * @example
+     *
+     * _.fromPairs([['a', 1], ['b', 2]]);
+     * // => { 'a': 1, 'b': 2 }
+     */
+    function fromPairs(pairs) {
+      var index = -1,
+          length = pairs == null ? 0 : pairs.length,
+          result = {};
+
+      while (++index < length) {
+        var pair = pairs[index];
+        result[pair[0]] = pair[1];
+      }
+      return result;
+    }
+
+    /**
+     * Gets the first element of `array`.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @alias first
+     * @category Array
+     * @param {Array} array The array to query.
+     * @returns {*} Returns the first element of `array`.
+     * @example
+     *
+     * _.head([1, 2, 3]);
+     * // => 1
+     *
+     * _.head([]);
+     * // => undefined
+     */
+    function head(array) {
+      return (array && array.length) ? array[0] : undefined;
+    }
+
+    /**
+     * Gets the index at which the first occurrence of `value` is found in `array`
+     * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
+     * for equality comparisons. If `fromIndex` is negative, it's used as the
+     * offset from the end of `array`.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Array
+     * @param {Array} array The array to inspect.
+     * @param {*} value The value to search for.
+     * @param {number} [fromIndex=0] The index to search from.
+     * @returns {number} Returns the index of the matched value, else `-1`.
+     * @example
+     *
+     * _.indexOf([1, 2, 1, 2], 2);
+     * // => 1
+     *
+     * // Search from the `fromIndex`.
+     * _.indexOf([1, 2, 1, 2], 2, 2);
+     * // => 3
+     */
+    function indexOf(array, value, fromIndex) {
+      var length = array == null ? 0 : array.length;
+      if (!length) {
+        return -1;
+      }
+      var index = fromIndex == null ? 0 : toInteger(fromIndex);
+      if (index < 0) {
+        index = nativeMax(length + index, 0);
+      }
+      return baseIndexOf(array, value, index);
+    }
+
+    /**
+     * Gets all but the last element of `array`.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Array
+     * @param {Array} array The array to query.
+     * @returns {Array} Returns the slice of `array`.
+     * @example
+     *
+     * _.initial([1, 2, 3]);
+     * // => [1, 2]
+     */
+    function initial(array) {
+      var length = array == null ? 0 : array.length;
+      return length ? baseSlice(array, 0, -1) : [];
+    }
+
+    /**
+     * Creates an array of unique values that are included in all given arrays
+     * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
+     * for equality comparisons. The order and references of result values are
+     * determined by the first array.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Array
+     * @param {...Array} [arrays] The arrays to inspect.
+     * @returns {Array} Returns the new array of intersecting values.
+     * @example
+     *
+     * _.intersection([2, 1], [2, 3]);
+     * // => [2]
+     */
+    var intersection = baseRest(function(arrays) {
+      var mapped = arrayMap(arrays, castArrayLikeObject);
+      return (mapped.length && mapped[0] === arrays[0])
+        ? baseIntersection(mapped)
+        : [];
+    });
+
+    /**
+     * This method is like `_.intersection` except that it accepts `iteratee`
+     * which is invoked for each element of each `arrays` to generate the criterion
+     * by which they're compared. The order and references of result values are
+     * determined by the first array. The iteratee is invoked with one argument:
+     * (value).
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Array
+     * @param {...Array} [arrays] The arrays to inspect.
+     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
+     * @returns {Array} Returns the new array of intersecting values.
+     * @example
+     *
+     * _.intersectionBy([2.1, 1.2], [2.3, 3.4], Math.floor);
+     * // => [2.1]
+     *
+     * // The `_.property` iteratee shorthand.
+     * _.intersectionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
+     * // => [{ 'x': 1 }]
+     */
+    var intersectionBy = baseRest(function(arrays) {
+      var iteratee = last(arrays),
+          mapped = arrayMap(arrays, castArrayLikeObject);
+
+      if (iteratee === last(mapped)) {
+        iteratee = undefined;
+      } else {
+        mapped.pop();
+      }
+      return (mapped.length && mapped[0] === arrays[0])
+        ? baseIntersection(mapped, getIteratee(iteratee, 2))
+        : [];
+    });
+
+    /**
+     * This method is like `_.intersection` except that it accepts `comparator`
+     * which is invoked to compare elements of `arrays`. The order and references
+     * of result values are determined by the first array. The comparator is
+     * invoked with two arguments: (arrVal, othVal).
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Array
+     * @param {...Array} [arrays] The arrays to inspect.
+     * @param {Function} [comparator] The comparator invoked per element.
+     * @returns {Array} Returns the new array of intersecting values.
+     * @example
+     *
+     * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
+     * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
+     *
+     * _.intersectionWith(objects, others, _.isEqual);
+     * // => [{ 'x': 1, 'y': 2 }]
+     */
+    var intersectionWith = baseRest(function(arrays) {
+      var comparator = last(arrays),
+          mapped = arrayMap(arrays, castArrayLikeObject);
+
+      comparator = typeof comparator == 'function' ? comparator : undefined;
+      if (comparator) {
+        mapped.pop();
+      }
+      return (mapped.length && mapped[0] === arrays[0])
+        ? baseIntersection(mapped, undefined, comparator)
+        : [];
+    });
+
+    /**
+     * Converts all elements in `array` into a string separated by `separator`.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Array
+     * @param {Array} array The array to convert.
+     * @param {string} [separator=','] The element separator.
+     * @returns {string} Returns the joined string.
+     * @example
+     *
+     * _.join(['a', 'b', 'c'], '~');
+     * // => 'a~b~c'
+     */
+    function join(array, separator) {
+      return array == null ? '' : nativeJoin.call(array, separator);
+    }
+
+    /**
+     * Gets the last element of `array`.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Array
+     * @param {Array} array The array to query.
+     * @returns {*} Returns the last element of `array`.
+     * @example
+     *
+     * _.last([1, 2, 3]);
+     * // => 3
+     */
+    function last(array) {
+      var length = array == null ? 0 : array.length;
+      return length ? array[length - 1] : undefined;
+    }
+
+    /**
+     * This method is like `_.indexOf` except that it iterates over elements of
+     * `array` from right to left.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Array
+     * @param {Array} array The array to inspect.
+     * @param {*} value The value to search for.
+     * @param {number} [fromIndex=array.length-1] The index to search from.
+     * @returns {number} Returns the index of the matched value, else `-1`.
+     * @example
+     *
+     * _.lastIndexOf([1, 2, 1, 2], 2);
+     * // => 3
+     *
+     * // Search from the `fromIndex`.
+     * _.lastIndexOf([1, 2, 1, 2], 2, 2);
+     * // => 1
+     */
+    function lastIndexOf(array, value, fromIndex) {
+      var length = array == null ? 0 : array.length;
+      if (!length) {
+        return -1;
+      }
+      var index = length;
+      if (fromIndex !== undefined) {
+        index = toInteger(fromIndex);
+        index = index < 0 ? nativeMax(length + index, 0) : nativeMin(index, length - 1);
+      }
+      return value === value
+        ? strictLastIndexOf(array, value, index)
+        : baseFindIndex(array, baseIsNaN, index, true);
+    }
+
+    /**
+     * Gets the element at index `n` of `array`. If `n` is negative, the nth
+     * element from the end is returned.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.11.0
+     * @category Array
+     * @param {Array} array The array to query.
+     * @param {number} [n=0] The index of the element to return.
+     * @returns {*} Returns the nth element of `array`.
+     * @example
+     *
+     * var array = ['a', 'b', 'c', 'd'];
+     *
+     * _.nth(array, 1);
+     * // => 'b'
+     *
+     * _.nth(array, -2);
+     * // => 'c';
+     */
+    function nth(array, n) {
+      return (array && array.length) ? baseNth(array, toInteger(n)) : undefined;
+    }
+
+    /**
+     * Removes all given values from `array` using
+     * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
+     * for equality comparisons.
+     *
+     * **Note:** Unlike `_.without`, this method mutates `array`. Use `_.remove`
+     * to remove elements from an array by predicate.
+     *
+     * @static
+     * @memberOf _
+     * @since 2.0.0
+     * @category Array
+     * @param {Array} array The array to modify.
+     * @param {...*} [values] The values to remove.
+     * @returns {Array} Returns `array`.
+     * @example
+     *
+     * var array = ['a', 'b', 'c', 'a', 'b', 'c'];
+     *
+     * _.pull(array, 'a', 'c');
+     * console.log(array);
+     * // => ['b', 'b']
+     */
+    var pull = baseRest(pullAll);
+
+    /**
+     * This method is like `_.pull` except that it accepts an array of values to remove.
+     *
+     * **Note:** Unlike `_.difference`, this method mutates `array`.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Array
+     * @param {Array} array The array to modify.
+     * @param {Array} values The values to remove.
+     * @returns {Array} Returns `array`.
+     * @example
+     *
+     * var array = ['a', 'b', 'c', 'a', 'b', 'c'];
+     *
+     * _.pullAll(array, ['a', 'c']);
+     * console.log(array);
+     * // => ['b', 'b']
+     */
+    function pullAll(array, values) {
+      return (array && array.length && values && values.length)
+        ? basePullAll(array, values)
+        : array;
+    }
+
+    /**
+     * This method is like `_.pullAll` except that it accepts `iteratee` which is
+     * invoked for each element of `array` and `values` to generate the criterion
+     * by which they're compared. The iteratee is invoked with one argument: (value).
+     *
+     * **Note:** Unlike `_.differenceBy`, this method mutates `array`.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Array
+     * @param {Array} array The array to modify.
+     * @param {Array} values The values to remove.
+     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
+     * @returns {Array} Returns `array`.
+     * @example
+     *
+     * var array = [{ 'x': 1 }, { 'x': 2 }, { 'x': 3 }, { 'x': 1 }];
+     *
+     * _.pullAllBy(array, [{ 'x': 1 }, { 'x': 3 }], 'x');
+     * console.log(array);
+     * // => [{ 'x': 2 }]
+     */
+    function pullAllBy(array, values, iteratee) {
+      return (array && array.length && values && values.length)
+        ? basePullAll(array, values, getIteratee(iteratee, 2))
+        : array;
+    }
+
+    /**
+     * This method is like `_.pullAll` except that it accepts `comparator` which
+     * is invoked to compare elements of `array` to `values`. The comparator is
+     * invoked with two arguments: (arrVal, othVal).
+     *
+     * **Note:** Unlike `_.differenceWith`, this method mutates `array`.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.6.0
+     * @category Array
+     * @param {Array} array The array to modify.
+     * @param {Array} values The values to remove.
+     * @param {Function} [comparator] The comparator invoked per element.
+     * @returns {Array} Returns `array`.
+     * @example
+     *
+     * var array = [{ 'x': 1, 'y': 2 }, { 'x': 3, 'y': 4 }, { 'x': 5, 'y': 6 }];
+     *
+     * _.pullAllWith(array, [{ 'x': 3, 'y': 4 }], _.isEqual);
+     * console.log(array);
+     * // => [{ 'x': 1, 'y': 2 }, { 'x': 5, 'y': 6 }]
+     */
+    function pullAllWith(array, values, comparator) {
+      return (array && array.length && values && values.length)
+        ? basePullAll(array, values, undefined, comparator)
+        : array;
+    }
+
+    /**
+     * Removes elements from `array` corresponding to `indexes` and returns an
+     * array of removed elements.
+     *
+     * **Note:** Unlike `_.at`, this method mutates `array`.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category Array
+     * @param {Array} array The array to modify.
+     * @param {...(number|number[])} [indexes] The indexes of elements to remove.
+     * @returns {Array} Returns the new array of removed elements.
+     * @example
+     *
+     * var array = ['a', 'b', 'c', 'd'];
+     * var pulled = _.pullAt(array, [1, 3]);
+     *
+     * console.log(array);
+     * // => ['a', 'c']
+     *
+     * console.log(pulled);
+     * // => ['b', 'd']
+     */
+    var pullAt = flatRest(function(array, indexes) {
+      var length = array == null ? 0 : array.length,
+          result = baseAt(array, indexes);
+
+      basePullAt(array, arrayMap(indexes, function(index) {
+        return isIndex(index, length) ? +index : index;
+      }).sort(compareAscending));
+
+      return result;
+    });
+
+    /**
+     * Removes all elements from `array` that `predicate` returns truthy for
+     * and returns an array of the removed elements. The predicate is invoked
+     * with three arguments: (value, index, array).
+     *
+     * **Note:** Unlike `_.filter`, this method mutates `array`. Use `_.pull`
+     * to pull elements from an array by value.
+     *
+     * @static
+     * @memberOf _
+     * @since 2.0.0
+     * @category Array
+     * @param {Array} array The array to modify.
+     * @param {Function} [predicate=_.identity] The function invoked per iteration.
+     * @returns {Array} Returns the new array of removed elements.
+     * @example
+     *
+     * var array = [1, 2, 3, 4];
+     * var evens = _.remove(array, function(n) {
+     *   return n % 2 == 0;
+     * });
+     *
+     * console.log(array);
+     * // => [1, 3]
+     *
+     * console.log(evens);
+     * // => [2, 4]
+     */
+    function remove(array, predicate) {
+      var result = [];
+      if (!(array && array.length)) {
+        return result;
+      }
+      var index = -1,
+          indexes = [],
+          length = array.length;
+
+      predicate = getIteratee(predicate, 3);
+      while (++index < length) {
+        var value = array[index];
+        if (predicate(value, index, array)) {
+          result.push(value);
+          indexes.push(index);
+        }
+      }
+      basePullAt(array, indexes);
+      return result;
+    }
+
+    /**
+     * Reverses `array` so that the first element becomes the last, the second
+     * element becomes the second to last, and so on.
+     *
+     * **Note:** This method mutates `array` and is based on
+     * [`Array#reverse`](https://mdn.io/Array/reverse).
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Array
+     * @param {Array} array The array to modify.
+     * @returns {Array} Returns `array`.
+     * @example
+     *
+     * var array = [1, 2, 3];
+     *
+     * _.reverse(array);
+     * // => [3, 2, 1]
+     *
+     * console.log(array);
+     * // => [3, 2, 1]
+     */
+    function reverse(array) {
+      return array == null ? array : nativeReverse.call(array);
+    }
+
+    /**
+     * Creates a slice of `array` from `start` up to, but not including, `end`.
+     *
+     * **Note:** This method is used instead of
+     * [`Array#slice`](https://mdn.io/Array/slice) to ensure dense arrays are
+     * returned.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category Array
+     * @param {Array} array The array to slice.
+     * @param {number} [start=0] The start position.
+     * @param {number} [end=array.length] The end position.
+     * @returns {Array} Returns the slice of `array`.
+     */
+    function slice(array, start, end) {
+      var length = array == null ? 0 : array.length;
+      if (!length) {
+        return [];
+      }
+      if (end && typeof end != 'number' && isIterateeCall(array, start, end)) {
+        start = 0;
+        end = length;
+      }
+      else {
+        start = start == null ? 0 : toInteger(start);
+        end = end === undefined ? length : toInteger(end);
+      }
+      return baseSlice(array, start, end);
+    }
+
+    /**
+     * Uses a binary search to determine the lowest index at which `value`
+     * should be inserted into `array` in order to maintain its sort order.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Array
+     * @param {Array} array The sorted array to inspect.
+     * @param {*} value The value to evaluate.
+     * @returns {number} Returns the index at which `value` should be inserted
+     *  into `array`.
+     * @example
+     *
+     * _.sortedIndex([30, 50], 40);
+     * // => 1
+     */
+    function sortedIndex(array, value) {
+      return baseSortedIndex(array, value);
+    }
+
+    /**
+     * This method is like `_.sortedIndex` except that it accepts `iteratee`
+     * which is invoked for `value` and each element of `array` to compute their
+     * sort ranking. The iteratee is invoked with one argument: (value).
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Array
+     * @param {Array} array The sorted array to inspect.
+     * @param {*} value The value to evaluate.
+     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
+     * @returns {number} Returns the index at which `value` should be inserted
+     *  into `array`.
+     * @example
+     *
+     * var objects = [{ 'x': 4 }, { 'x': 5 }];
+     *
+     * _.sortedIndexBy(objects, { 'x': 4 }, function(o) { return o.x; });
+     * // => 0
+     *
+     * // The `_.property` iteratee shorthand.
+     * _.sortedIndexBy(objects, { 'x': 4 }, 'x');
+     * // => 0
+     */
+    function sortedIndexBy(array, value, iteratee) {
+      return baseSortedIndexBy(array, value, getIteratee(iteratee, 2));
+    }
+
+    /**
+     * This method is like `_.indexOf` except that it performs a binary
+     * search on a sorted `array`.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Array
+     * @param {Array} array The array to inspect.
+     * @param {*} value The value to search for.
+     * @returns {number} Returns the index of the matched value, else `-1`.
+     * @example
+     *
+     * _.sortedIndexOf([4, 5, 5, 5, 6], 5);
+     * // => 1
+     */
+    function sortedIndexOf(array, value) {
+      var length = array == null ? 0 : array.length;
+      if (length) {
+        var index = baseSortedIndex(array, value);
+        if (index < length && eq(array[index], value)) {
+          return index;
+        }
+      }
+      return -1;
+    }
+
+    /**
+     * This method is like `_.sortedIndex` except that it returns the highest
+     * index at which `value` should be inserted into `array` in order to
+     * maintain its sort order.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category Array
+     * @param {Array} array The sorted array to inspect.
+     * @param {*} value The value to evaluate.
+     * @returns {number} Returns the index at which `value` should be inserted
+     *  into `array`.
+     * @example
+     *
+     * _.sortedLastIndex([4, 5, 5, 5, 6], 5);
+     * // => 4
+     */
+    function sortedLastIndex(array, value) {
+      return baseSortedIndex(array, value, true);
+    }
+
+    /**
+     * This method is like `_.sortedLastIndex` except that it accepts `iteratee`
+     * which is invoked for `value` and each element of `array` to compute their
+     * sort ranking. The iteratee is invoked with one argument: (value).
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Array
+     * @param {Array} array The sorted array to inspect.
+     * @param {*} value The value to evaluate.
+     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
+     * @returns {number} Returns the index at which `value` should be inserted
+     *  into `array`.
+     * @example
+     *
+     * var objects = [{ 'x': 4 }, { 'x': 5 }];
+     *
+     * _.sortedLastIndexBy(objects, { 'x': 4 }, function(o) { return o.x; });
+     * // => 1
+     *
+     * // The `_.property` iteratee shorthand.
+     * _.sortedLastIndexBy(objects, { 'x': 4 }, 'x');
+     * // => 1
+     */
+    function sortedLastIndexBy(array, value, iteratee) {
+      return baseSortedIndexBy(array, value, getIteratee(iteratee, 2), true);
+    }
+
+    /**
+     * This method is like `_.lastIndexOf` except that it performs a binary
+     * search on a sorted `array`.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Array
+     * @param {Array} array The array to inspect.
+     * @param {*} value The value to search for.
+     * @returns {number} Returns the index of the matched value, else `-1`.
+     * @example
+     *
+     * _.sortedLastIndexOf([4, 5, 5, 5, 6], 5);
+     * // => 3
+     */
+    function sortedLastIndexOf(array, value) {
+      var length = array == null ? 0 : array.length;
+      if (length) {
+        var index = baseSortedIndex(array, value, true) - 1;
+        if (eq(array[index], value)) {
+          return index;
+        }
+      }
+      return -1;
+    }
+
+    /**
+     * This method is like `_.uniq` except that it's designed and optimized
+     * for sorted arrays.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Array
+     * @param {Array} array The array to inspect.
+     * @returns {Array} Returns the new duplicate free array.
+     * @example
+     *
+     * _.sortedUniq([1, 1, 2]);
+     * // => [1, 2]
+     */
+    function sortedUniq(array) {
+      return (array && array.length)
+        ? baseSortedUniq(array)
+        : [];
+    }
+
+    /**
+     * This method is like `_.uniqBy` except that it's designed and optimized
+     * for sorted arrays.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Array
+     * @param {Array} array The array to inspect.
+     * @param {Function} [iteratee] The iteratee invoked per element.
+     * @returns {Array} Returns the new duplicate free array.
+     * @example
+     *
+     * _.sortedUniqBy([1.1, 1.2, 2.3, 2.4], Math.floor);
+     * // => [1.1, 2.3]
+     */
+    function sortedUniqBy(array, iteratee) {
+      return (array && array.length)
+        ? baseSortedUniq(array, getIteratee(iteratee, 2))
+        : [];
+    }
+
+    /**
+     * Gets all but the first element of `array`.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Array
+     * @param {Array} array The array to query.
+     * @returns {Array} Returns the slice of `array`.
+     * @example
+     *
+     * _.tail([1, 2, 3]);
+     * // => [2, 3]
+     */
+    function tail(array) {
+      var length = array == null ? 0 : array.length;
+      return length ? baseSlice(array, 1, length) : [];
+    }
+
+    /**
+     * Creates a slice of `array` with `n` elements taken from the beginning.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Array
+     * @param {Array} array The array to query.
+     * @param {number} [n=1] The number of elements to take.
+     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
+     * @returns {Array} Returns the slice of `array`.
+     * @example
+     *
+     * _.take([1, 2, 3]);
+     * // => [1]
+     *
+     * _.take([1, 2, 3], 2);
+     * // => [1, 2]
+     *
+     * _.take([1, 2, 3], 5);
+     * // => [1, 2, 3]
+     *
+     * _.take([1, 2, 3], 0);
+     * // => []
+     */
+    function take(array, n, guard) {
+      if (!(array && array.length)) {
+        return [];
+      }
+      n = (guard || n === undefined) ? 1 : toInteger(n);
+      return baseSlice(array, 0, n < 0 ? 0 : n);
+    }
+
+    /**
+     * Creates a slice of `array` with `n` elements taken from the end.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category Array
+     * @param {Array} array The array to query.
+     * @param {number} [n=1] The number of elements to take.
+     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
+     * @returns {Array} Returns the slice of `array`.
+     * @example
+     *
+     * _.takeRight([1, 2, 3]);
+     * // => [3]
+     *
+     * _.takeRight([1, 2, 3], 2);
+     * // => [2, 3]
+     *
+     * _.takeRight([1, 2, 3], 5);
+     * // => [1, 2, 3]
+     *
+     * _.takeRight([1, 2, 3], 0);
+     * // => []
+     */
+    function takeRight(array, n, guard) {
+      var length = array == null ? 0 : array.length;
+      if (!length) {
+        return [];
+      }
+      n = (guard || n === undefined) ? 1 : toInteger(n);
+      n = length - n;
+      return baseSlice(array, n < 0 ? 0 : n, length);
+    }
+
+    /**
+     * Creates a slice of `array` with elements taken from the end. Elements are
+     * taken until `predicate` returns falsey. The predicate is invoked with
+     * three arguments: (value, index, array).
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category Array
+     * @param {Array} array The array to query.
+     * @param {Function} [predicate=_.identity] The function invoked per iteration.
+     * @returns {Array} Returns the slice of `array`.
+     * @example
+     *
+     * var users = [
+     *   { 'user': 'barney',  'active': true },
+     *   { 'user': 'fred',    'active': false },
+     *   { 'user': 'pebbles', 'active': false }
+     * ];
+     *
+     * _.takeRightWhile(users, function(o) { return !o.active; });
+     * // => objects for ['fred', 'pebbles']
+     *
+     * // The `_.matches` iteratee shorthand.
+     * _.takeRightWhile(users, { 'user': 'pebbles', 'active': false });
+     * // => objects for ['pebbles']
+     *
+     * // The `_.matchesProperty` iteratee shorthand.
+     * _.takeRightWhile(users, ['active', false]);
+     * // => objects for ['fred', 'pebbles']
+     *
+     * // The `_.property` iteratee shorthand.
+     * _.takeRightWhile(users, 'active');
+     * // => []
+     */
+    function takeRightWhile(array, predicate) {
+      return (array && array.length)
+        ? baseWhile(array, getIteratee(predicate, 3), false, true)
+        : [];
+    }
+
+    /**
+     * Creates a slice of `array` with elements taken from the beginning. Elements
+     * are taken until `predicate` returns falsey. The predicate is invoked with
+     * three arguments: (value, index, array).
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category Array
+     * @param {Array} array The array to query.
+     * @param {Function} [predicate=_.identity] The function invoked per iteration.
+     * @returns {Array} Returns the slice of `array`.
+     * @example
+     *
+     * var users = [
+     *   { 'user': 'barney',  'active': false },
+     *   { 'user': 'fred',    'active': false },
+     *   { 'user': 'pebbles', 'active': true }
+     * ];
+     *
+     * _.takeWhile(users, function(o) { return !o.active; });
+     * // => objects for ['barney', 'fred']
+     *
+     * // The `_.matches` iteratee shorthand.
+     * _.takeWhile(users, { 'user': 'barney', 'active': false });
+     * // => objects for ['barney']
+     *
+     * // The `_.matchesProperty` iteratee shorthand.
+     * _.takeWhile(users, ['active', false]);
+     * // => objects for ['barney', 'fred']
+     *
+     * // The `_.property` iteratee shorthand.
+     * _.takeWhile(users, 'active');
+     * // => []
+     */
+    function takeWhile(array, predicate) {
+      return (array && array.length)
+        ? baseWhile(array, getIteratee(predicate, 3))
+        : [];
+    }
+
+    /**
+     * Creates an array of unique values, in order, from all given arrays using
+     * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
+     * for equality comparisons.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Array
+     * @param {...Array} [arrays] The arrays to inspect.
+     * @returns {Array} Returns the new array of combined values.
+     * @example
+     *
+     * _.union([2], [1, 2]);
+     * // => [2, 1]
+     */
+    var union = baseRest(function(arrays) {
+      return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true));
+    });
+
+    /**
+     * This method is like `_.union` except that it accepts `iteratee` which is
+     * invoked for each element of each `arrays` to generate the criterion by
+     * which uniqueness is computed. Result values are chosen from the first
+     * array in which the value occurs. The iteratee is invoked with one argument:
+     * (value).
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Array
+     * @param {...Array} [arrays] The arrays to inspect.
+     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
+     * @returns {Array} Returns the new array of combined values.
+     * @example
+     *
+     * _.unionBy([2.1], [1.2, 2.3], Math.floor);
+     * // => [2.1, 1.2]
+     *
+     * // The `_.property` iteratee shorthand.
+     * _.unionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
+     * // => [{ 'x': 1 }, { 'x': 2 }]
+     */
+    var unionBy = baseRest(function(arrays) {
+      var iteratee = last(arrays);
+      if (isArrayLikeObject(iteratee)) {
+        iteratee = undefined;
+      }
+      return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), getIteratee(iteratee, 2));
+    });
+
+    /**
+     * This method is like `_.union` except that it accepts `comparator` which
+     * is invoked to compare elements of `arrays`. Result values are chosen from
+     * the first array in which the value occurs. The comparator is invoked
+     * with two arguments: (arrVal, othVal).
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Array
+     * @param {...Array} [arrays] The arrays to inspect.
+     * @param {Function} [comparator] The comparator invoked per element.
+     * @returns {Array} Returns the new array of combined values.
+     * @example
+     *
+     * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
+     * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
+     *
+     * _.unionWith(objects, others, _.isEqual);
+     * // => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }]
+     */
+    var unionWith = baseRest(function(arrays) {
+      var comparator = last(arrays);
+      comparator = typeof comparator == 'function' ? comparator : undefined;
+      return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), undefined, comparator);
+    });
+
+    /**
+     * Creates a duplicate-free version of an array, using
+     * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
+     * for equality comparisons, in which only the first occurrence of each element
+     * is kept. The order of result values is determined by the order they occur
+     * in the array.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Array
+     * @param {Array} array The array to inspect.
+     * @returns {Array} Returns the new duplicate free array.
+     * @example
+     *
+     * _.uniq([2, 1, 2]);
+     * // => [2, 1]
+     */
+    function uniq(array) {
+      return (array && array.length) ? baseUniq(array) : [];
+    }
+
+    /**
+     * This method is like `_.uniq` except that it accepts `iteratee` which is
+     * invoked for each element in `array` to generate the criterion by which
+     * uniqueness is computed. The order of result values is determined by the
+     * order they occur in the array. The iteratee is invoked with one argument:
+     * (value).
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Array
+     * @param {Array} array The array to inspect.
+     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
+     * @returns {Array} Returns the new duplicate free array.
+     * @example
+     *
+     * _.uniqBy([2.1, 1.2, 2.3], Math.floor);
+     * // => [2.1, 1.2]
+     *
+     * // The `_.property` iteratee shorthand.
+     * _.uniqBy([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x');
+     * // => [{ 'x': 1 }, { 'x': 2 }]
+     */
+    function uniqBy(array, iteratee) {
+      return (array && array.length) ? baseUniq(array, getIteratee(iteratee, 2)) : [];
+    }
+
+    /**
+     * This method is like `_.uniq` except that it accepts `comparator` which
+     * is invoked to compare elements of `array`. The order of result values is
+     * determined by the order they occur in the array.The comparator is invoked
+     * with two arguments: (arrVal, othVal).
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Array
+     * @param {Array} array The array to inspect.
+     * @param {Function} [comparator] The comparator invoked per element.
+     * @returns {Array} Returns the new duplicate free array.
+     * @example
+     *
+     * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 2 }];
+     *
+     * _.uniqWith(objects, _.isEqual);
+     * // => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }]
+     */
+    function uniqWith(array, comparator) {
+      comparator = typeof comparator == 'function' ? comparator : undefined;
+      return (array && array.length) ? baseUniq(array, undefined, comparator) : [];
+    }
+
+    /**
+     * This method is like `_.zip` except that it accepts an array of grouped
+     * elements and creates an array regrouping the elements to their pre-zip
+     * configuration.
+     *
+     * @static
+     * @memberOf _
+     * @since 1.2.0
+     * @category Array
+     * @param {Array} array The array of grouped elements to process.
+     * @returns {Array} Returns the new array of regrouped elements.
+     * @example
+     *
+     * var zipped = _.zip(['a', 'b'], [1, 2], [true, false]);
+     * // => [['a', 1, true], ['b', 2, false]]
+     *
+     * _.unzip(zipped);
+     * // => [['a', 'b'], [1, 2], [true, false]]
+     */
+    function unzip(array) {
+      if (!(array && array.length)) {
+        return [];
+      }
+      var length = 0;
+      array = arrayFilter(array, function(group) {
+        if (isArrayLikeObject(group)) {
+          length = nativeMax(group.length, length);
+          return true;
+        }
+      });
+      return baseTimes(length, function(index) {
+        return arrayMap(array, baseProperty(index));
+      });
+    }
+
+    /**
+     * This method is like `_.unzip` except that it accepts `iteratee` to specify
+     * how regrouped values should be combined. The iteratee is invoked with the
+     * elements of each group: (...group).
+     *
+     * @static
+     * @memberOf _
+     * @since 3.8.0
+     * @category Array
+     * @param {Array} array The array of grouped elements to process.
+     * @param {Function} [iteratee=_.identity] The function to combine
+     *  regrouped values.
+     * @returns {Array} Returns the new array of regrouped elements.
+     * @example
+     *
+     * var zipped = _.zip([1, 2], [10, 20], [100, 200]);
+     * // => [[1, 10, 100], [2, 20, 200]]
+     *
+     * _.unzipWith(zipped, _.add);
+     * // => [3, 30, 300]
+     */
+    function unzipWith(array, iteratee) {
+      if (!(array && array.length)) {
+        return [];
+      }
+      var result = unzip(array);
+      if (iteratee == null) {
+        return result;
+      }
+      return arrayMap(result, function(group) {
+        return apply(iteratee, undefined, group);
+      });
+    }
+
+    /**
+     * Creates an array excluding all given values using
+     * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
+     * for equality comparisons.
+     *
+     * **Note:** Unlike `_.pull`, this method returns a new array.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Array
+     * @param {Array} array The array to inspect.
+     * @param {...*} [values] The values to exclude.
+     * @returns {Array} Returns the new array of filtered values.
+     * @see _.difference, _.xor
+     * @example
+     *
+     * _.without([2, 1, 2, 3], 1, 2);
+     * // => [3]
+     */
+    var without = baseRest(function(array, values) {
+      return isArrayLikeObject(array)
+        ? baseDifference(array, values)
+        : [];
+    });
+
+    /**
+     * Creates an array of unique values that is the
+     * [symmetric difference](https://en.wikipedia.org/wiki/Symmetric_difference)
+     * of the given arrays. The order of result values is determined by the order
+     * they occur in the arrays.
+     *
+     * @static
+     * @memberOf _
+     * @since 2.4.0
+     * @category Array
+     * @param {...Array} [arrays] The arrays to inspect.
+     * @returns {Array} Returns the new array of filtered values.
+     * @see _.difference, _.without
+     * @example
+     *
+     * _.xor([2, 1], [2, 3]);
+     * // => [1, 3]
+     */
+    var xor = baseRest(function(arrays) {
+      return baseXor(arrayFilter(arrays, isArrayLikeObject));
+    });
+
+    /**
+     * This method is like `_.xor` except that it accepts `iteratee` which is
+     * invoked for each element of each `arrays` to generate the criterion by
+     * which by which they're compared. The order of result values is determined
+     * by the order they occur in the arrays. The iteratee is invoked with one
+     * argument: (value).
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Array
+     * @param {...Array} [arrays] The arrays to inspect.
+     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
+     * @returns {Array} Returns the new array of filtered values.
+     * @example
+     *
+     * _.xorBy([2.1, 1.2], [2.3, 3.4], Math.floor);
+     * // => [1.2, 3.4]
+     *
+     * // The `_.property` iteratee shorthand.
+     * _.xorBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
+     * // => [{ 'x': 2 }]
+     */
+    var xorBy = baseRest(function(arrays) {
+      var iteratee = last(arrays);
+      if (isArrayLikeObject(iteratee)) {
+        iteratee = undefined;
+      }
+      return baseXor(arrayFilter(arrays, isArrayLikeObject), getIteratee(iteratee, 2));
+    });
+
+    /**
+     * This method is like `_.xor` except that it accepts `comparator` which is
+     * invoked to compare elements of `arrays`. The order of result values is
+     * determined by the order they occur in the arrays. The comparator is invoked
+     * with two arguments: (arrVal, othVal).
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Array
+     * @param {...Array} [arrays] The arrays to inspect.
+     * @param {Function} [comparator] The comparator invoked per element.
+     * @returns {Array} Returns the new array of filtered values.
+     * @example
+     *
+     * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
+     * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
+     *
+     * _.xorWith(objects, others, _.isEqual);
+     * // => [{ 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }]
+     */
+    var xorWith = baseRest(function(arrays) {
+      var comparator = last(arrays);
+      comparator = typeof comparator == 'function' ? comparator : undefined;
+      return baseXor(arrayFilter(arrays, isArrayLikeObject), undefined, comparator);
+    });
+
+    /**
+     * Creates an array of grouped elements, the first of which contains the
+     * first elements of the given arrays, the second of which contains the
+     * second elements of the given arrays, and so on.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Array
+     * @param {...Array} [arrays] The arrays to process.
+     * @returns {Array} Returns the new array of grouped elements.
+     * @example
+     *
+     * _.zip(['a', 'b'], [1, 2], [true, false]);
+     * // => [['a', 1, true], ['b', 2, false]]
+     */
+    var zip = baseRest(unzip);
+
+    /**
+     * This method is like `_.fromPairs` except that it accepts two arrays,
+     * one of property identifiers and one of corresponding values.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.4.0
+     * @category Array
+     * @param {Array} [props=[]] The property identifiers.
+     * @param {Array} [values=[]] The property values.
+     * @returns {Object} Returns the new object.
+     * @example
+     *
+     * _.zipObject(['a', 'b'], [1, 2]);
+     * // => { 'a': 1, 'b': 2 }
+     */
+    function zipObject(props, values) {
+      return baseZipObject(props || [], values || [], assignValue);
+    }
+
+    /**
+     * This method is like `_.zipObject` except that it supports property paths.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.1.0
+     * @category Array
+     * @param {Array} [props=[]] The property identifiers.
+     * @param {Array} [values=[]] The property values.
+     * @returns {Object} Returns the new object.
+     * @example
+     *
+     * _.zipObjectDeep(['a.b[0].c', 'a.b[1].d'], [1, 2]);
+     * // => { 'a': { 'b': [{ 'c': 1 }, { 'd': 2 }] } }
+     */
+    function zipObjectDeep(props, values) {
+      return baseZipObject(props || [], values || [], baseSet);
+    }
+
+    /**
+     * This method is like `_.zip` except that it accepts `iteratee` to specify
+     * how grouped values should be combined. The iteratee is invoked with the
+     * elements of each group: (...group).
+     *
+     * @static
+     * @memberOf _
+     * @since 3.8.0
+     * @category Array
+     * @param {...Array} [arrays] The arrays to process.
+     * @param {Function} [iteratee=_.identity] The function to combine
+     *  grouped values.
+     * @returns {Array} Returns the new array of grouped elements.
+     * @example
+     *
+     * _.zipWith([1, 2], [10, 20], [100, 200], function(a, b, c) {
+     *   return a + b + c;
+     * });
+     * // => [111, 222]
+     */
+    var zipWith = baseRest(function(arrays) {
+      var length = arrays.length,
+          iteratee = length > 1 ? arrays[length - 1] : undefined;
+
+      iteratee = typeof iteratee == 'function' ? (arrays.pop(), iteratee) : undefined;
+      return unzipWith(arrays, iteratee);
+    });
+
+    /*------------------------------------------------------------------------*/
+
+    /**
+     * Creates a `lodash` wrapper instance that wraps `value` with explicit method
+     * chain sequences enabled. The result of such sequences must be unwrapped
+     * with `_#value`.
+     *
+     * @static
+     * @memberOf _
+     * @since 1.3.0
+     * @category Seq
+     * @param {*} value The value to wrap.
+     * @returns {Object} Returns the new `lodash` wrapper instance.
+     * @example
+     *
+     * var users = [
+     *   { 'user': 'barney',  'age': 36 },
+     *   { 'user': 'fred',    'age': 40 },
+     *   { 'user': 'pebbles', 'age': 1 }
+     * ];
+     *
+     * var youngest = _
+     *   .chain(users)
+     *   .sortBy('age')
+     *   .map(function(o) {
+     *     return o.user + ' is ' + o.age;
+     *   })
+     *   .head()
+     *   .value();
+     * // => 'pebbles is 1'
+     */
+    function chain(value) {
+      var result = lodash(value);
+      result.__chain__ = true;
+      return result;
+    }
+
+    /**
+     * This method invokes `interceptor` and returns `value`. The interceptor
+     * is invoked with one argument; (value). The purpose of this method is to
+     * "tap into" a method chain sequence in order to modify intermediate results.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Seq
+     * @param {*} value The value to provide to `interceptor`.
+     * @param {Function} interceptor The function to invoke.
+     * @returns {*} Returns `value`.
+     * @example
+     *
+     * _([1, 2, 3])
+     *  .tap(function(array) {
+     *    // Mutate input array.
+     *    array.pop();
+     *  })
+     *  .reverse()
+     *  .value();
+     * // => [2, 1]
+     */
+    function tap(value, interceptor) {
+      interceptor(value);
+      return value;
+    }
+
+    /**
+     * This method is like `_.tap` except that it returns the result of `interceptor`.
+     * The purpose of this method is to "pass thru" values replacing intermediate
+     * results in a method chain sequence.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category Seq
+     * @param {*} value The value to provide to `interceptor`.
+     * @param {Function} interceptor The function to invoke.
+     * @returns {*} Returns the result of `interceptor`.
+     * @example
+     *
+     * _('  abc  ')
+     *  .chain()
+     *  .trim()
+     *  .thru(function(value) {
+     *    return [value];
+     *  })
+     *  .value();
+     * // => ['abc']
+     */
+    function thru(value, interceptor) {
+      return interceptor(value);
+    }
+
+    /**
+     * This method is the wrapper version of `_.at`.
+     *
+     * @name at
+     * @memberOf _
+     * @since 1.0.0
+     * @category Seq
+     * @param {...(string|string[])} [paths] The property paths to pick.
+     * @returns {Object} Returns the new `lodash` wrapper instance.
+     * @example
+     *
+     * var object = { 'a': [{ 'b': { 'c': 3 } }, 4] };
+     *
+     * _(object).at(['a[0].b.c', 'a[1]']).value();
+     * // => [3, 4]
+     */
+    var wrapperAt = flatRest(function(paths) {
+      var length = paths.length,
+          start = length ? paths[0] : 0,
+          value = this.__wrapped__,
+          interceptor = function(object) { return baseAt(object, paths); };
+
+      if (length > 1 || this.__actions__.length ||
+          !(value instanceof LazyWrapper) || !isIndex(start)) {
+        return this.thru(interceptor);
+      }
+      value = value.slice(start, +start + (length ? 1 : 0));
+      value.__actions__.push({
+        'func': thru,
+        'args': [interceptor],
+        'thisArg': undefined
+      });
+      return new LodashWrapper(value, this.__chain__).thru(function(array) {
+        if (length && !array.length) {
+          array.push(undefined);
+        }
+        return array;
+      });
+    });
+
+    /**
+     * Creates a `lodash` wrapper instance with explicit method chain sequences enabled.
+     *
+     * @name chain
+     * @memberOf _
+     * @since 0.1.0
+     * @category Seq
+     * @returns {Object} Returns the new `lodash` wrapper instance.
+     * @example
+     *
+     * var users = [
+     *   { 'user': 'barney', 'age': 36 },
+     *   { 'user': 'fred',   'age': 40 }
+     * ];
+     *
+     * // A sequence without explicit chaining.
+     * _(users).head();
+     * // => { 'user': 'barney', 'age': 36 }
+     *
+     * // A sequence with explicit chaining.
+     * _(users)
+     *   .chain()
+     *   .head()
+     *   .pick('user')
+     *   .value();
+     * // => { 'user': 'barney' }
+     */
+    function wrapperChain() {
+      return chain(this);
+    }
+
+    /**
+     * Executes the chain sequence and returns the wrapped result.
+     *
+     * @name commit
+     * @memberOf _
+     * @since 3.2.0
+     * @category Seq
+     * @returns {Object} Returns the new `lodash` wrapper instance.
+     * @example
+     *
+     * var array = [1, 2];
+     * var wrapped = _(array).push(3);
+     *
+     * console.log(array);
+     * // => [1, 2]
+     *
+     * wrapped = wrapped.commit();
+     * console.log(array);
+     * // => [1, 2, 3]
+     *
+     * wrapped.last();
+     * // => 3
+     *
+     * console.log(array);
+     * // => [1, 2, 3]
+     */
+    function wrapperCommit() {
+      return new LodashWrapper(this.value(), this.__chain__);
+    }
+
+    /**
+     * Gets the next value on a wrapped object following the
+     * [iterator protocol](https://mdn.io/iteration_protocols#iterator).
+     *
+     * @name next
+     * @memberOf _
+     * @since 4.0.0
+     * @category Seq
+     * @returns {Object} Returns the next iterator value.
+     * @example
+     *
+     * var wrapped = _([1, 2]);
+     *
+     * wrapped.next();
+     * // => { 'done': false, 'value': 1 }
+     *
+     * wrapped.next();
+     * // => { 'done': false, 'value': 2 }
+     *
+     * wrapped.next();
+     * // => { 'done': true, 'value': undefined }
+     */
+    function wrapperNext() {
+      if (this.__values__ === undefined) {
+        this.__values__ = toArray(this.value());
+      }
+      var done = this.__index__ >= this.__values__.length,
+          value = done ? undefined : this.__values__[this.__index__++];
+
+      return { 'done': done, 'value': value };
+    }
+
+    /**
+     * Enables the wrapper to be iterable.
+     *
+     * @name Symbol.iterator
+     * @memberOf _
+     * @since 4.0.0
+     * @category Seq
+     * @returns {Object} Returns the wrapper object.
+     * @example
+     *
+     * var wrapped = _([1, 2]);
+     *
+     * wrapped[Symbol.iterator]() === wrapped;
+     * // => true
+     *
+     * Array.from(wrapped);
+     * // => [1, 2]
+     */
+    function wrapperToIterator() {
+      return this;
+    }
+
+    /**
+     * Creates a clone of the chain sequence planting `value` as the wrapped value.
+     *
+     * @name plant
+     * @memberOf _
+     * @since 3.2.0
+     * @category Seq
+     * @param {*} value The value to plant.
+     * @returns {Object} Returns the new `lodash` wrapper instance.
+     * @example
+     *
+     * function square(n) {
+     *   return n * n;
+     * }
+     *
+     * var wrapped = _([1, 2]).map(square);
+     * var other = wrapped.plant([3, 4]);
+     *
+     * other.value();
+     * // => [9, 16]
+     *
+     * wrapped.value();
+     * // => [1, 4]
+     */
+    function wrapperPlant(value) {
+      var result,
+          parent = this;
+
+      while (parent instanceof baseLodash) {
+        var clone = wrapperClone(parent);
+        clone.__index__ = 0;
+        clone.__values__ = undefined;
+        if (result) {
+          previous.__wrapped__ = clone;
+        } else {
+          result = clone;
+        }
+        var previous = clone;
+        parent = parent.__wrapped__;
+      }
+      previous.__wrapped__ = value;
+      return result;
+    }
+
+    /**
+     * This method is the wrapper version of `_.reverse`.
+     *
+     * **Note:** This method mutates the wrapped array.
+     *
+     * @name reverse
+     * @memberOf _
+     * @since 0.1.0
+     * @category Seq
+     * @returns {Object} Returns the new `lodash` wrapper instance.
+     * @example
+     *
+     * var array = [1, 2, 3];
+     *
+     * _(array).reverse().value()
+     * // => [3, 2, 1]
+     *
+     * console.log(array);
+     * // => [3, 2, 1]
+     */
+    function wrapperReverse() {
+      var value = this.__wrapped__;
+      if (value instanceof LazyWrapper) {
+        var wrapped = value;
+        if (this.__actions__.length) {
+          wrapped = new LazyWrapper(this);
+        }
+        wrapped = wrapped.reverse();
+        wrapped.__actions__.push({
+          'func': thru,
+          'args': [reverse],
+          'thisArg': undefined
+        });
+        return new LodashWrapper(wrapped, this.__chain__);
+      }
+      return this.thru(reverse);
+    }
+
+    /**
+     * Executes the chain sequence to resolve the unwrapped value.
+     *
+     * @name value
+     * @memberOf _
+     * @since 0.1.0
+     * @alias toJSON, valueOf
+     * @category Seq
+     * @returns {*} Returns the resolved unwrapped value.
+     * @example
+     *
+     * _([1, 2, 3]).value();
+     * // => [1, 2, 3]
+     */
+    function wrapperValue() {
+      return baseWrapperValue(this.__wrapped__, this.__actions__);
+    }
+
+    /*------------------------------------------------------------------------*/
+
+    /**
+     * Creates an object composed of keys generated from the results of running
+     * each element of `collection` thru `iteratee`. The corresponding value of
+     * each key is the number of times the key was returned by `iteratee`. The
+     * iteratee is invoked with one argument: (value).
+     *
+     * @static
+     * @memberOf _
+     * @since 0.5.0
+     * @category Collection
+     * @param {Array|Object} collection The collection to iterate over.
+     * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
+     * @returns {Object} Returns the composed aggregate object.
+     * @example
+     *
+     * _.countBy([6.1, 4.2, 6.3], Math.floor);
+     * // => { '4': 1, '6': 2 }
+     *
+     * // The `_.property` iteratee shorthand.
+     * _.countBy(['one', 'two', 'three'], 'length');
+     * // => { '3': 2, '5': 1 }
+     */
+    var countBy = createAggregator(function(result, value, key) {
+      if (hasOwnProperty.call(result, key)) {
+        ++result[key];
+      } else {
+        baseAssignValue(result, key, 1);
+      }
+    });
+
+    /**
+     * Checks if `predicate` returns truthy for **all** elements of `collection`.
+     * Iteration is stopped once `predicate` returns falsey. The predicate is
+     * invoked with three arguments: (value, index|key, collection).
+     *
+     * **Note:** This method returns `true` for
+     * [empty collections](https://en.wikipedia.org/wiki/Empty_set) because
+     * [everything is true](https://en.wikipedia.org/wiki/Vacuous_truth) of
+     * elements of empty collections.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Collection
+     * @param {Array|Object} collection The collection to iterate over.
+     * @param {Function} [predicate=_.identity] The function invoked per iteration.
+     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
+     * @returns {boolean} Returns `true` if all elements pass the predicate check,
+     *  else `false`.
+     * @example
+     *
+     * _.every([true, 1, null, 'yes'], Boolean);
+     * // => false
+     *
+     * var users = [
+     *   { 'user': 'barney', 'age': 36, 'active': false },
+     *   { 'user': 'fred',   'age': 40, 'active': false }
+     * ];
+     *
+     * // The `_.matches` iteratee shorthand.
+     * _.every(users, { 'user': 'barney', 'active': false });
+     * // => false
+     *
+     * // The `_.matchesProperty` iteratee shorthand.
+     * _.every(users, ['active', false]);
+     * // => true
+     *
+     * // The `_.property` iteratee shorthand.
+     * _.every(users, 'active');
+     * // => false
+     */
+    function every(collection, predicate, guard) {
+      var func = isArray(collection) ? arrayEvery : baseEvery;
+      if (guard && isIterateeCall(collection, predicate, guard)) {
+        predicate = undefined;
+      }
+      return func(collection, getIteratee(predicate, 3));
+    }
+
+    /**
+     * Iterates over elements of `collection`, returning an array of all elements
+     * `predicate` returns truthy for. The predicate is invoked with three
+     * arguments: (value, index|key, collection).
+     *
+     * **Note:** Unlike `_.remove`, this method returns a new array.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Collection
+     * @param {Array|Object} collection The collection to iterate over.
+     * @param {Function} [predicate=_.identity] The function invoked per iteration.
+     * @returns {Array} Returns the new filtered array.
+     * @see _.reject
+     * @example
+     *
+     * var users = [
+     *   { 'user': 'barney', 'age': 36, 'active': true },
+     *   { 'user': 'fred',   'age': 40, 'active': false }
+     * ];
+     *
+     * _.filter(users, function(o) { return !o.active; });
+     * // => objects for ['fred']
+     *
+     * // The `_.matches` iteratee shorthand.
+     * _.filter(users, { 'age': 36, 'active': true });
+     * // => objects for ['barney']
+     *
+     * // The `_.matchesProperty` iteratee shorthand.
+     * _.filter(users, ['active', false]);
+     * // => objects for ['fred']
+     *
+     * // The `_.property` iteratee shorthand.
+     * _.filter(users, 'active');
+     * // => objects for ['barney']
+     *
+     * // Combining several predicates using `_.overEvery` or `_.overSome`.
+     * _.filter(users, _.overSome([{ 'age': 36 }, ['age', 40]]));
+     * // => objects for ['fred', 'barney']
+     */
+    function filter(collection, predicate) {
+      var func = isArray(collection) ? arrayFilter : baseFilter;
+      return func(collection, getIteratee(predicate, 3));
+    }
+
+    /**
+     * Iterates over elements of `collection`, returning the first element
+     * `predicate` returns truthy for. The predicate is invoked with three
+     * arguments: (value, index|key, collection).
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Collection
+     * @param {Array|Object} collection The collection to inspect.
+     * @param {Function} [predicate=_.identity] The function invoked per iteration.
+     * @param {number} [fromIndex=0] The index to search from.
+     * @returns {*} Returns the matched element, else `undefined`.
+     * @example
+     *
+     * var users = [
+     *   { 'user': 'barney',  'age': 36, 'active': true },
+     *   { 'user': 'fred',    'age': 40, 'active': false },
+     *   { 'user': 'pebbles', 'age': 1,  'active': true }
+     * ];
+     *
+     * _.find(users, function(o) { return o.age < 40; });
+     * // => object for 'barney'
+     *
+     * // The `_.matches` iteratee shorthand.
+     * _.find(users, { 'age': 1, 'active': true });
+     * // => object for 'pebbles'
+     *
+     * // The `_.matchesProperty` iteratee shorthand.
+     * _.find(users, ['active', false]);
+     * // => object for 'fred'
+     *
+     * // The `_.property` iteratee shorthand.
+     * _.find(users, 'active');
+     * // => object for 'barney'
+     */
+    var find = createFind(findIndex);
+
+    /**
+     * This method is like `_.find` except that it iterates over elements of
+     * `collection` from right to left.
+     *
+     * @static
+     * @memberOf _
+     * @since 2.0.0
+     * @category Collection
+     * @param {Array|Object} collection The collection to inspect.
+     * @param {Function} [predicate=_.identity] The function invoked per iteration.
+     * @param {number} [fromIndex=collection.length-1] The index to search from.
+     * @returns {*} Returns the matched element, else `undefined`.
+     * @example
+     *
+     * _.findLast([1, 2, 3, 4], function(n) {
+     *   return n % 2 == 1;
+     * });
+     * // => 3
+     */
+    var findLast = createFind(findLastIndex);
+
+    /**
+     * Creates a flattened array of values by running each element in `collection`
+     * thru `iteratee` and flattening the mapped results. The iteratee is invoked
+     * with three arguments: (value, index|key, collection).
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Collection
+     * @param {Array|Object} collection The collection to iterate over.
+     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+     * @returns {Array} Returns the new flattened array.
+     * @example
+     *
+     * function duplicate(n) {
+     *   return [n, n];
+     * }
+     *
+     * _.flatMap([1, 2], duplicate);
+     * // => [1, 1, 2, 2]
+     */
+    function flatMap(collection, iteratee) {
+      return baseFlatten(map(collection, iteratee), 1);
+    }
+
+    /**
+     * This method is like `_.flatMap` except that it recursively flattens the
+     * mapped results.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.7.0
+     * @category Collection
+     * @param {Array|Object} collection The collection to iterate over.
+     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+     * @returns {Array} Returns the new flattened array.
+     * @example
+     *
+     * function duplicate(n) {
+     *   return [[[n, n]]];
+     * }
+     *
+     * _.flatMapDeep([1, 2], duplicate);
+     * // => [1, 1, 2, 2]
+     */
+    function flatMapDeep(collection, iteratee) {
+      return baseFlatten(map(collection, iteratee), INFINITY);
+    }
+
+    /**
+     * This method is like `_.flatMap` except that it recursively flattens the
+     * mapped results up to `depth` times.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.7.0
+     * @category Collection
+     * @param {Array|Object} collection The collection to iterate over.
+     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+     * @param {number} [depth=1] The maximum recursion depth.
+     * @returns {Array} Returns the new flattened array.
+     * @example
+     *
+     * function duplicate(n) {
+     *   return [[[n, n]]];
+     * }
+     *
+     * _.flatMapDepth([1, 2], duplicate, 2);
+     * // => [[1, 1], [2, 2]]
+     */
+    function flatMapDepth(collection, iteratee, depth) {
+      depth = depth === undefined ? 1 : toInteger(depth);
+      return baseFlatten(map(collection, iteratee), depth);
+    }
+
+    /**
+     * Iterates over elements of `collection` and invokes `iteratee` for each element.
+     * The iteratee is invoked with three arguments: (value, index|key, collection).
+     * Iteratee functions may exit iteration early by explicitly returning `false`.
+     *
+     * **Note:** As with other "Collections" methods, objects with a "length"
+     * property are iterated like arrays. To avoid this behavior use `_.forIn`
+     * or `_.forOwn` for object iteration.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @alias each
+     * @category Collection
+     * @param {Array|Object} collection The collection to iterate over.
+     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+     * @returns {Array|Object} Returns `collection`.
+     * @see _.forEachRight
+     * @example
+     *
+     * _.forEach([1, 2], function(value) {
+     *   console.log(value);
+     * });
+     * // => Logs `1` then `2`.
+     *
+     * _.forEach({ 'a': 1, 'b': 2 }, function(value, key) {
+     *   console.log(key);
+     * });
+     * // => Logs 'a' then 'b' (iteration order is not guaranteed).
+     */
+    function forEach(collection, iteratee) {
+      var func = isArray(collection) ? arrayEach : baseEach;
+      return func(collection, getIteratee(iteratee, 3));
+    }
+
+    /**
+     * This method is like `_.forEach` except that it iterates over elements of
+     * `collection` from right to left.
+     *
+     * @static
+     * @memberOf _
+     * @since 2.0.0
+     * @alias eachRight
+     * @category Collection
+     * @param {Array|Object} collection The collection to iterate over.
+     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+     * @returns {Array|Object} Returns `collection`.
+     * @see _.forEach
+     * @example
+     *
+     * _.forEachRight([1, 2], function(value) {
+     *   console.log(value);
+     * });
+     * // => Logs `2` then `1`.
+     */
+    function forEachRight(collection, iteratee) {
+      var func = isArray(collection) ? arrayEachRight : baseEachRight;
+      return func(collection, getIteratee(iteratee, 3));
+    }
+
+    /**
+     * Creates an object composed of keys generated from the results of running
+     * each element of `collection` thru `iteratee`. The order of grouped values
+     * is determined by the order they occur in `collection`. The corresponding
+     * value of each key is an array of elements responsible for generating the
+     * key. The iteratee is invoked with one argument: (value).
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Collection
+     * @param {Array|Object} collection The collection to iterate over.
+     * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
+     * @returns {Object} Returns the composed aggregate object.
+     * @example
+     *
+     * _.groupBy([6.1, 4.2, 6.3], Math.floor);
+     * // => { '4': [4.2], '6': [6.1, 6.3] }
+     *
+     * // The `_.property` iteratee shorthand.
+     * _.groupBy(['one', 'two', 'three'], 'length');
+     * // => { '3': ['one', 'two'], '5': ['three'] }
+     */
+    var groupBy = createAggregator(function(result, value, key) {
+      if (hasOwnProperty.call(result, key)) {
+        result[key].push(value);
+      } else {
+        baseAssignValue(result, key, [value]);
+      }
+    });
+
+    /**
+     * Checks if `value` is in `collection`. If `collection` is a string, it's
+     * checked for a substring of `value`, otherwise
+     * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
+     * is used for equality comparisons. If `fromIndex` is negative, it's used as
+     * the offset from the end of `collection`.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Collection
+     * @param {Array|Object|string} collection The collection to inspect.
+     * @param {*} value The value to search for.
+     * @param {number} [fromIndex=0] The index to search from.
+     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.reduce`.
+     * @returns {boolean} Returns `true` if `value` is found, else `false`.
+     * @example
+     *
+     * _.includes([1, 2, 3], 1);
+     * // => true
+     *
+     * _.includes([1, 2, 3], 1, 2);
+     * // => false
+     *
+     * _.includes({ 'a': 1, 'b': 2 }, 1);
+     * // => true
+     *
+     * _.includes('abcd', 'bc');
+     * // => true
+     */
+    function includes(collection, value, fromIndex, guard) {
+      collection = isArrayLike(collection) ? collection : values(collection);
+      fromIndex = (fromIndex && !guard) ? toInteger(fromIndex) : 0;
+
+      var length = collection.length;
+      if (fromIndex < 0) {
+        fromIndex = nativeMax(length + fromIndex, 0);
+      }
+      return isString(collection)
+        ? (fromIndex <= length && collection.indexOf(value, fromIndex) > -1)
+        : (!!length && baseIndexOf(collection, value, fromIndex) > -1);
+    }
+
+    /**
+     * Invokes the method at `path` of each element in `collection`, returning
+     * an array of the results of each invoked method. Any additional arguments
+     * are provided to each invoked method. If `path` is a function, it's invoked
+     * for, and `this` bound to, each element in `collection`.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Collection
+     * @param {Array|Object} collection The collection to iterate over.
+     * @param {Array|Function|string} path The path of the method to invoke or
+     *  the function invoked per iteration.
+     * @param {...*} [args] The arguments to invoke each method with.
+     * @returns {Array} Returns the array of results.
+     * @example
+     *
+     * _.invokeMap([[5, 1, 7], [3, 2, 1]], 'sort');
+     * // => [[1, 5, 7], [1, 2, 3]]
+     *
+     * _.invokeMap([123, 456], String.prototype.split, '');
+     * // => [['1', '2', '3'], ['4', '5', '6']]
+     */
+    var invokeMap = baseRest(function(collection, path, args) {
+      var index = -1,
+          isFunc = typeof path == 'function',
+          result = isArrayLike(collection) ? Array(collection.length) : [];
+
+      baseEach(collection, function(value) {
+        result[++index] = isFunc ? apply(path, value, args) : baseInvoke(value, path, args);
+      });
+      return result;
+    });
+
+    /**
+     * Creates an object composed of keys generated from the results of running
+     * each element of `collection` thru `iteratee`. The corresponding value of
+     * each key is the last element responsible for generating the key. The
+     * iteratee is invoked with one argument: (value).
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Collection
+     * @param {Array|Object} collection The collection to iterate over.
+     * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
+     * @returns {Object} Returns the composed aggregate object.
+     * @example
+     *
+     * var array = [
+     *   { 'dir': 'left', 'code': 97 },
+     *   { 'dir': 'right', 'code': 100 }
+     * ];
+     *
+     * _.keyBy(array, function(o) {
+     *   return String.fromCharCode(o.code);
+     * });
+     * // => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } }
+     *
+     * _.keyBy(array, 'dir');
+     * // => { 'left': { 'dir': 'left', 'code': 97 }, 'right': { 'dir': 'right', 'code': 100 } }
+     */
+    var keyBy = createAggregator(function(result, value, key) {
+      baseAssignValue(result, key, value);
+    });
+
+    /**
+     * Creates an array of values by running each element in `collection` thru
+     * `iteratee`. The iteratee is invoked with three arguments:
+     * (value, index|key, collection).
+     *
+     * Many lodash methods are guarded to work as iteratees for methods like
+     * `_.every`, `_.filter`, `_.map`, `_.mapValues`, `_.reject`, and `_.some`.
+     *
+     * The guarded methods are:
+     * `ary`, `chunk`, `curry`, `curryRight`, `drop`, `dropRight`, `every`,
+     * `fill`, `invert`, `parseInt`, `random`, `range`, `rangeRight`, `repeat`,
+     * `sampleSize`, `slice`, `some`, `sortBy`, `split`, `take`, `takeRight`,
+     * `template`, `trim`, `trimEnd`, `trimStart`, and `words`
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Collection
+     * @param {Array|Object} collection The collection to iterate over.
+     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+     * @returns {Array} Returns the new mapped array.
+     * @example
+     *
+     * function square(n) {
+     *   return n * n;
+     * }
+     *
+     * _.map([4, 8], square);
+     * // => [16, 64]
+     *
+     * _.map({ 'a': 4, 'b': 8 }, square);
+     * // => [16, 64] (iteration order is not guaranteed)
+     *
+     * var users = [
+     *   { 'user': 'barney' },
+     *   { 'user': 'fred' }
+     * ];
+     *
+     * // The `_.property` iteratee shorthand.
+     * _.map(users, 'user');
+     * // => ['barney', 'fred']
+     */
+    function map(collection, iteratee) {
+      var func = isArray(collection) ? arrayMap : baseMap;
+      return func(collection, getIteratee(iteratee, 3));
+    }
+
+    /**
+     * This method is like `_.sortBy` except that it allows specifying the sort
+     * orders of the iteratees to sort by. If `orders` is unspecified, all values
+     * are sorted in ascending order. Otherwise, specify an order of "desc" for
+     * descending or "asc" for ascending sort order of corresponding values.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Collection
+     * @param {Array|Object} collection The collection to iterate over.
+     * @param {Array[]|Function[]|Object[]|string[]} [iteratees=[_.identity]]
+     *  The iteratees to sort by.
+     * @param {string[]} [orders] The sort orders of `iteratees`.
+     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.reduce`.
+     * @returns {Array} Returns the new sorted array.
+     * @example
+     *
+     * var users = [
+     *   { 'user': 'fred',   'age': 48 },
+     *   { 'user': 'barney', 'age': 34 },
+     *   { 'user': 'fred',   'age': 40 },
+     *   { 'user': 'barney', 'age': 36 }
+     * ];
+     *
+     * // Sort by `user` in ascending order and by `age` in descending order.
+     * _.orderBy(users, ['user', 'age'], ['asc', 'desc']);
+     * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 40]]
+     */
+    function orderBy(collection, iteratees, orders, guard) {
+      if (collection == null) {
+        return [];
+      }
+      if (!isArray(iteratees)) {
+        iteratees = iteratees == null ? [] : [iteratees];
+      }
+      orders = guard ? undefined : orders;
+      if (!isArray(orders)) {
+        orders = orders == null ? [] : [orders];
+      }
+      return baseOrderBy(collection, iteratees, orders);
+    }
+
+    /**
+     * Creates an array of elements split into two groups, the first of which
+     * contains elements `predicate` returns truthy for, the second of which
+     * contains elements `predicate` returns falsey for. The predicate is
+     * invoked with one argument: (value).
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category Collection
+     * @param {Array|Object} collection The collection to iterate over.
+     * @param {Function} [predicate=_.identity] The function invoked per iteration.
+     * @returns {Array} Returns the array of grouped elements.
+     * @example
+     *
+     * var users = [
+     *   { 'user': 'barney',  'age': 36, 'active': false },
+     *   { 'user': 'fred',    'age': 40, 'active': true },
+     *   { 'user': 'pebbles', 'age': 1,  'active': false }
+     * ];
+     *
+     * _.partition(users, function(o) { return o.active; });
+     * // => objects for [['fred'], ['barney', 'pebbles']]
+     *
+     * // The `_.matches` iteratee shorthand.
+     * _.partition(users, { 'age': 1, 'active': false });
+     * // => objects for [['pebbles'], ['barney', 'fred']]
+     *
+     * // The `_.matchesProperty` iteratee shorthand.
+     * _.partition(users, ['active', false]);
+     * // => objects for [['barney', 'pebbles'], ['fred']]
+     *
+     * // The `_.property` iteratee shorthand.
+     * _.partition(users, 'active');
+     * // => objects for [['fred'], ['barney', 'pebbles']]
+     */
+    var partition = createAggregator(function(result, value, key) {
+      result[key ? 0 : 1].push(value);
+    }, function() { return [[], []]; });
+
+    /**
+     * Reduces `collection` to a value which is the accumulated result of running
+     * each element in `collection` thru `iteratee`, where each successive
+     * invocation is supplied the return value of the previous. If `accumulator`
+     * is not given, the first element of `collection` is used as the initial
+     * value. The iteratee is invoked with four arguments:
+     * (accumulator, value, index|key, collection).
+     *
+     * Many lodash methods are guarded to work as iteratees for methods like
+     * `_.reduce`, `_.reduceRight`, and `_.transform`.
+     *
+     * The guarded methods are:
+     * `assign`, `defaults`, `defaultsDeep`, `includes`, `merge`, `orderBy`,
+     * and `sortBy`
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Collection
+     * @param {Array|Object} collection The collection to iterate over.
+     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+     * @param {*} [accumulator] The initial value.
+     * @returns {*} Returns the accumulated value.
+     * @see _.reduceRight
+     * @example
+     *
+     * _.reduce([1, 2], function(sum, n) {
+     *   return sum + n;
+     * }, 0);
+     * // => 3
+     *
+     * _.reduce({ 'a': 1, 'b': 2, 'c': 1 }, function(result, value, key) {
+     *   (result[value] || (result[value] = [])).push(key);
+     *   return result;
+     * }, {});
+     * // => { '1': ['a', 'c'], '2': ['b'] } (iteration order is not guaranteed)
+     */
+    function reduce(collection, iteratee, accumulator) {
+      var func = isArray(collection) ? arrayReduce : baseReduce,
+          initAccum = arguments.length < 3;
+
+      return func(collection, getIteratee(iteratee, 4), accumulator, initAccum, baseEach);
+    }
+
+    /**
+     * This method is like `_.reduce` except that it iterates over elements of
+     * `collection` from right to left.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Collection
+     * @param {Array|Object} collection The collection to iterate over.
+     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+     * @param {*} [accumulator] The initial value.
+     * @returns {*} Returns the accumulated value.
+     * @see _.reduce
+     * @example
+     *
+     * var array = [[0, 1], [2, 3], [4, 5]];
+     *
+     * _.reduceRight(array, function(flattened, other) {
+     *   return flattened.concat(other);
+     * }, []);
+     * // => [4, 5, 2, 3, 0, 1]
+     */
+    function reduceRight(collection, iteratee, accumulator) {
+      var func = isArray(collection) ? arrayReduceRight : baseReduce,
+          initAccum = arguments.length < 3;
+
+      return func(collection, getIteratee(iteratee, 4), accumulator, initAccum, baseEachRight);
+    }
+
+    /**
+     * The opposite of `_.filter`; this method returns the elements of `collection`
+     * that `predicate` does **not** return truthy for.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Collection
+     * @param {Array|Object} collection The collection to iterate over.
+     * @param {Function} [predicate=_.identity] The function invoked per iteration.
+     * @returns {Array} Returns the new filtered array.
+     * @see _.filter
+     * @example
+     *
+     * var users = [
+     *   { 'user': 'barney', 'age': 36, 'active': false },
+     *   { 'user': 'fred',   'age': 40, 'active': true }
+     * ];
+     *
+     * _.reject(users, function(o) { return !o.active; });
+     * // => objects for ['fred']
+     *
+     * // The `_.matches` iteratee shorthand.
+     * _.reject(users, { 'age': 40, 'active': true });
+     * // => objects for ['barney']
+     *
+     * // The `_.matchesProperty` iteratee shorthand.
+     * _.reject(users, ['active', false]);
+     * // => objects for ['fred']
+     *
+     * // The `_.property` iteratee shorthand.
+     * _.reject(users, 'active');
+     * // => objects for ['barney']
+     */
+    function reject(collection, predicate) {
+      var func = isArray(collection) ? arrayFilter : baseFilter;
+      return func(collection, negate(getIteratee(predicate, 3)));
+    }
+
+    /**
+     * Gets a random element from `collection`.
+     *
+     * @static
+     * @memberOf _
+     * @since 2.0.0
+     * @category Collection
+     * @param {Array|Object} collection The collection to sample.
+     * @returns {*} Returns the random element.
+     * @example
+     *
+     * _.sample([1, 2, 3, 4]);
+     * // => 2
+     */
+    function sample(collection) {
+      var func = isArray(collection) ? arraySample : baseSample;
+      return func(collection);
+    }
+
+    /**
+     * Gets `n` random elements at unique keys from `collection` up to the
+     * size of `collection`.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Collection
+     * @param {Array|Object} collection The collection to sample.
+     * @param {number} [n=1] The number of elements to sample.
+     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
+     * @returns {Array} Returns the random elements.
+     * @example
+     *
+     * _.sampleSize([1, 2, 3], 2);
+     * // => [3, 1]
+     *
+     * _.sampleSize([1, 2, 3], 4);
+     * // => [2, 3, 1]
+     */
+    function sampleSize(collection, n, guard) {
+      if ((guard ? isIterateeCall(collection, n, guard) : n === undefined)) {
+        n = 1;
+      } else {
+        n = toInteger(n);
+      }
+      var func = isArray(collection) ? arraySampleSize : baseSampleSize;
+      return func(collection, n);
+    }
+
+    /**
+     * Creates an array of shuffled values, using a version of the
+     * [Fisher-Yates shuffle](https://en.wikipedia.org/wiki/Fisher-Yates_shuffle).
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Collection
+     * @param {Array|Object} collection The collection to shuffle.
+     * @returns {Array} Returns the new shuffled array.
+     * @example
+     *
+     * _.shuffle([1, 2, 3, 4]);
+     * // => [4, 1, 3, 2]
+     */
+    function shuffle(collection) {
+      var func = isArray(collection) ? arrayShuffle : baseShuffle;
+      return func(collection);
+    }
+
+    /**
+     * Gets the size of `collection` by returning its length for array-like
+     * values or the number of own enumerable string keyed properties for objects.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Collection
+     * @param {Array|Object|string} collection The collection to inspect.
+     * @returns {number} Returns the collection size.
+     * @example
+     *
+     * _.size([1, 2, 3]);
+     * // => 3
+     *
+     * _.size({ 'a': 1, 'b': 2 });
+     * // => 2
+     *
+     * _.size('pebbles');
+     * // => 7
+     */
+    function size(collection) {
+      if (collection == null) {
+        return 0;
+      }
+      if (isArrayLike(collection)) {
+        return isString(collection) ? stringSize(collection) : collection.length;
+      }
+      var tag = getTag(collection);
+      if (tag == mapTag || tag == setTag) {
+        return collection.size;
+      }
+      return baseKeys(collection).length;
+    }
+
+    /**
+     * Checks if `predicate` returns truthy for **any** element of `collection`.
+     * Iteration is stopped once `predicate` returns truthy. The predicate is
+     * invoked with three arguments: (value, index|key, collection).
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Collection
+     * @param {Array|Object} collection The collection to iterate over.
+     * @param {Function} [predicate=_.identity] The function invoked per iteration.
+     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
+     * @returns {boolean} Returns `true` if any element passes the predicate check,
+     *  else `false`.
+     * @example
+     *
+     * _.some([null, 0, 'yes', false], Boolean);
+     * // => true
+     *
+     * var users = [
+     *   { 'user': 'barney', 'active': true },
+     *   { 'user': 'fred',   'active': false }
+     * ];
+     *
+     * // The `_.matches` iteratee shorthand.
+     * _.some(users, { 'user': 'barney', 'active': false });
+     * // => false
+     *
+     * // The `_.matchesProperty` iteratee shorthand.
+     * _.some(users, ['active', false]);
+     * // => true
+     *
+     * // The `_.property` iteratee shorthand.
+     * _.some(users, 'active');
+     * // => true
+     */
+    function some(collection, predicate, guard) {
+      var func = isArray(collection) ? arraySome : baseSome;
+      if (guard && isIterateeCall(collection, predicate, guard)) {
+        predicate = undefined;
+      }
+      return func(collection, getIteratee(predicate, 3));
+    }
+
+    /**
+     * Creates an array of elements, sorted in ascending order by the results of
+     * running each element in a collection thru each iteratee. This method
+     * performs a stable sort, that is, it preserves the original sort order of
+     * equal elements. The iteratees are invoked with one argument: (value).
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Collection
+     * @param {Array|Object} collection The collection to iterate over.
+     * @param {...(Function|Function[])} [iteratees=[_.identity]]
+     *  The iteratees to sort by.
+     * @returns {Array} Returns the new sorted array.
+     * @example
+     *
+     * var users = [
+     *   { 'user': 'fred',   'age': 48 },
+     *   { 'user': 'barney', 'age': 36 },
+     *   { 'user': 'fred',   'age': 30 },
+     *   { 'user': 'barney', 'age': 34 }
+     * ];
+     *
+     * _.sortBy(users, [function(o) { return o.user; }]);
+     * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 30]]
+     *
+     * _.sortBy(users, ['user', 'age']);
+     * // => objects for [['barney', 34], ['barney', 36], ['fred', 30], ['fred', 48]]
+     */
+    var sortBy = baseRest(function(collection, iteratees) {
+      if (collection == null) {
+        return [];
+      }
+      var length = iteratees.length;
+      if (length > 1 && isIterateeCall(collection, iteratees[0], iteratees[1])) {
+        iteratees = [];
+      } else if (length > 2 && isIterateeCall(iteratees[0], iteratees[1], iteratees[2])) {
+        iteratees = [iteratees[0]];
+      }
+      return baseOrderBy(collection, baseFlatten(iteratees, 1), []);
+    });
+
+    /*------------------------------------------------------------------------*/
+
+    /**
+     * Gets the timestamp of the number of milliseconds that have elapsed since
+     * the Unix epoch (1 January 1970 00:00:00 UTC).
+     *
+     * @static
+     * @memberOf _
+     * @since 2.4.0
+     * @category Date
+     * @returns {number} Returns the timestamp.
+     * @example
+     *
+     * _.defer(function(stamp) {
+     *   console.log(_.now() - stamp);
+     * }, _.now());
+     * // => Logs the number of milliseconds it took for the deferred invocation.
+     */
+    var now = ctxNow || function() {
+      return root.Date.now();
+    };
+
+    /*------------------------------------------------------------------------*/
+
+    /**
+     * The opposite of `_.before`; this method creates a function that invokes
+     * `func` once it's called `n` or more times.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Function
+     * @param {number} n The number of calls before `func` is invoked.
+     * @param {Function} func The function to restrict.
+     * @returns {Function} Returns the new restricted function.
+     * @example
+     *
+     * var saves = ['profile', 'settings'];
+     *
+     * var done = _.after(saves.length, function() {
+     *   console.log('done saving!');
+     * });
+     *
+     * _.forEach(saves, function(type) {
+     *   asyncSave({ 'type': type, 'complete': done });
+     * });
+     * // => Logs 'done saving!' after the two async saves have completed.
+     */
+    function after(n, func) {
+      if (typeof func != 'function') {
+        throw new TypeError(FUNC_ERROR_TEXT);
+      }
+      n = toInteger(n);
+      return function() {
+        if (--n < 1) {
+          return func.apply(this, arguments);
+        }
+      };
+    }
+
+    /**
+     * Creates a function that invokes `func`, with up to `n` arguments,
+     * ignoring any additional arguments.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category Function
+     * @param {Function} func The function to cap arguments for.
+     * @param {number} [n=func.length] The arity cap.
+     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
+     * @returns {Function} Returns the new capped function.
+     * @example
+     *
+     * _.map(['6', '8', '10'], _.ary(parseInt, 1));
+     * // => [6, 8, 10]
+     */
+    function ary(func, n, guard) {
+      n = guard ? undefined : n;
+      n = (func && n == null) ? func.length : n;
+      return createWrap(func, WRAP_ARY_FLAG, undefined, undefined, undefined, undefined, n);
+    }
+
+    /**
+     * Creates a function that invokes `func`, with the `this` binding and arguments
+     * of the created function, while it's called less than `n` times. Subsequent
+     * calls to the created function return the result of the last `func` invocation.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category Function
+     * @param {number} n The number of calls at which `func` is no longer invoked.
+     * @param {Function} func The function to restrict.
+     * @returns {Function} Returns the new restricted function.
+     * @example
+     *
+     * jQuery(element).on('click', _.before(5, addContactToList));
+     * // => Allows adding up to 4 contacts to the list.
+     */
+    function before(n, func) {
+      var result;
+      if (typeof func != 'function') {
+        throw new TypeError(FUNC_ERROR_TEXT);
+      }
+      n = toInteger(n);
+      return function() {
+        if (--n > 0) {
+          result = func.apply(this, arguments);
+        }
+        if (n <= 1) {
+          func = undefined;
+        }
+        return result;
+      };
+    }
+
+    /**
+     * Creates a function that invokes `func` with the `this` binding of `thisArg`
+     * and `partials` prepended to the arguments it receives.
+     *
+     * The `_.bind.placeholder` value, which defaults to `_` in monolithic builds,
+     * may be used as a placeholder for partially applied arguments.
+     *
+     * **Note:** Unlike native `Function#bind`, this method doesn't set the "length"
+     * property of bound functions.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Function
+     * @param {Function} func The function to bind.
+     * @param {*} thisArg The `this` binding of `func`.
+     * @param {...*} [partials] The arguments to be partially applied.
+     * @returns {Function} Returns the new bound function.
+     * @example
+     *
+     * function greet(greeting, punctuation) {
+     *   return greeting + ' ' + this.user + punctuation;
+     * }
+     *
+     * var object = { 'user': 'fred' };
+     *
+     * var bound = _.bind(greet, object, 'hi');
+     * bound('!');
+     * // => 'hi fred!'
+     *
+     * // Bound with placeholders.
+     * var bound = _.bind(greet, object, _, '!');
+     * bound('hi');
+     * // => 'hi fred!'
+     */
+    var bind = baseRest(function(func, thisArg, partials) {
+      var bitmask = WRAP_BIND_FLAG;
+      if (partials.length) {
+        var holders = replaceHolders(partials, getHolder(bind));
+        bitmask |= WRAP_PARTIAL_FLAG;
+      }
+      return createWrap(func, bitmask, thisArg, partials, holders);
+    });
+
+    /**
+     * Creates a function that invokes the method at `object[key]` with `partials`
+     * prepended to the arguments it receives.
+     *
+     * This method differs from `_.bind` by allowing bound functions to reference
+     * methods that may be redefined or don't yet exist. See
+     * [Peter Michaux's article](http://peter.michaux.ca/articles/lazy-function-definition-pattern)
+     * for more details.
+     *
+     * The `_.bindKey.placeholder` value, which defaults to `_` in monolithic
+     * builds, may be used as a placeholder for partially applied arguments.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.10.0
+     * @category Function
+     * @param {Object} object The object to invoke the method on.
+     * @param {string} key The key of the method.
+     * @param {...*} [partials] The arguments to be partially applied.
+     * @returns {Function} Returns the new bound function.
+     * @example
+     *
+     * var object = {
+     *   'user': 'fred',
+     *   'greet': function(greeting, punctuation) {
+     *     return greeting + ' ' + this.user + punctuation;
+     *   }
+     * };
+     *
+     * var bound = _.bindKey(object, 'greet', 'hi');
+     * bound('!');
+     * // => 'hi fred!'
+     *
+     * object.greet = function(greeting, punctuation) {
+     *   return greeting + 'ya ' + this.user + punctuation;
+     * };
+     *
+     * bound('!');
+     * // => 'hiya fred!'
+     *
+     * // Bound with placeholders.
+     * var bound = _.bindKey(object, 'greet', _, '!');
+     * bound('hi');
+     * // => 'hiya fred!'
+     */
+    var bindKey = baseRest(function(object, key, partials) {
+      var bitmask = WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG;
+      if (partials.length) {
+        var holders = replaceHolders(partials, getHolder(bindKey));
+        bitmask |= WRAP_PARTIAL_FLAG;
+      }
+      return createWrap(key, bitmask, object, partials, holders);
+    });
+
+    /**
+     * Creates a function that accepts arguments of `func` and either invokes
+     * `func` returning its result, if at least `arity` number of arguments have
+     * been provided, or returns a function that accepts the remaining `func`
+     * arguments, and so on. The arity of `func` may be specified if `func.length`
+     * is not sufficient.
+     *
+     * The `_.curry.placeholder` value, which defaults to `_` in monolithic builds,
+     * may be used as a placeholder for provided arguments.
+     *
+     * **Note:** This method doesn't set the "length" property of curried functions.
+     *
+     * @static
+     * @memberOf _
+     * @since 2.0.0
+     * @category Function
+     * @param {Function} func The function to curry.
+     * @param {number} [arity=func.length] The arity of `func`.
+     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
+     * @returns {Function} Returns the new curried function.
+     * @example
+     *
+     * var abc = function(a, b, c) {
+     *   return [a, b, c];
+     * };
+     *
+     * var curried = _.curry(abc);
+     *
+     * curried(1)(2)(3);
+     * // => [1, 2, 3]
+     *
+     * curried(1, 2)(3);
+     * // => [1, 2, 3]
+     *
+     * curried(1, 2, 3);
+     * // => [1, 2, 3]
+     *
+     * // Curried with placeholders.
+     * curried(1)(_, 3)(2);
+     * // => [1, 2, 3]
+     */
+    function curry(func, arity, guard) {
+      arity = guard ? undefined : arity;
+      var result = createWrap(func, WRAP_CURRY_FLAG, undefined, undefined, undefined, undefined, undefined, arity);
+      result.placeholder = curry.placeholder;
+      return result;
+    }
+
+    /**
+     * This method is like `_.curry` except that arguments are applied to `func`
+     * in the manner of `_.partialRight` instead of `_.partial`.
+     *
+     * The `_.curryRight.placeholder` value, which defaults to `_` in monolithic
+     * builds, may be used as a placeholder for provided arguments.
+     *
+     * **Note:** This method doesn't set the "length" property of curried functions.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category Function
+     * @param {Function} func The function to curry.
+     * @param {number} [arity=func.length] The arity of `func`.
+     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
+     * @returns {Function} Returns the new curried function.
+     * @example
+     *
+     * var abc = function(a, b, c) {
+     *   return [a, b, c];
+     * };
+     *
+     * var curried = _.curryRight(abc);
+     *
+     * curried(3)(2)(1);
+     * // => [1, 2, 3]
+     *
+     * curried(2, 3)(1);
+     * // => [1, 2, 3]
+     *
+     * curried(1, 2, 3);
+     * // => [1, 2, 3]
+     *
+     * // Curried with placeholders.
+     * curried(3)(1, _)(2);
+     * // => [1, 2, 3]
+     */
+    function curryRight(func, arity, guard) {
+      arity = guard ? undefined : arity;
+      var result = createWrap(func, WRAP_CURRY_RIGHT_FLAG, undefined, undefined, undefined, undefined, undefined, arity);
+      result.placeholder = curryRight.placeholder;
+      return result;
+    }
+
+    /**
+     * Creates a debounced function that delays invoking `func` until after `wait`
+     * milliseconds have elapsed since the last time the debounced function was
+     * invoked. The debounced function comes with a `cancel` method to cancel
+     * delayed `func` invocations and a `flush` method to immediately invoke them.
+     * Provide `options` to indicate whether `func` should be invoked on the
+     * leading and/or trailing edge of the `wait` timeout. The `func` is invoked
+     * with the last arguments provided to the debounced function. Subsequent
+     * calls to the debounced function return the result of the last `func`
+     * invocation.
+     *
+     * **Note:** If `leading` and `trailing` options are `true`, `func` is
+     * invoked on the trailing edge of the timeout only if the debounced function
+     * is invoked more than once during the `wait` timeout.
+     *
+     * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred
+     * until to the next tick, similar to `setTimeout` with a timeout of `0`.
+     *
+     * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)
+     * for details over the differences between `_.debounce` and `_.throttle`.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Function
+     * @param {Function} func The function to debounce.
+     * @param {number} [wait=0] The number of milliseconds to delay.
+     * @param {Object} [options={}] The options object.
+     * @param {boolean} [options.leading=false]
+     *  Specify invoking on the leading edge of the timeout.
+     * @param {number} [options.maxWait]
+     *  The maximum time `func` is allowed to be delayed before it's invoked.
+     * @param {boolean} [options.trailing=true]
+     *  Specify invoking on the trailing edge of the timeout.
+     * @returns {Function} Returns the new debounced function.
+     * @example
+     *
+     * // Avoid costly calculations while the window size is in flux.
+     * jQuery(window).on('resize', _.debounce(calculateLayout, 150));
+     *
+     * // Invoke `sendMail` when clicked, debouncing subsequent calls.
+     * jQuery(element).on('click', _.debounce(sendMail, 300, {
+     *   'leading': true,
+     *   'trailing': false
+     * }));
+     *
+     * // Ensure `batchLog` is invoked once after 1 second of debounced calls.
+     * var debounced = _.debounce(batchLog, 250, { 'maxWait': 1000 });
+     * var source = new EventSource('/stream');
+     * jQuery(source).on('message', debounced);
+     *
+     * // Cancel the trailing debounced invocation.
+     * jQuery(window).on('popstate', debounced.cancel);
+     */
+    function debounce(func, wait, options) {
+      var lastArgs,
+          lastThis,
+          maxWait,
+          result,
+          timerId,
+          lastCallTime,
+          lastInvokeTime = 0,
+          leading = false,
+          maxing = false,
+          trailing = true;
+
+      if (typeof func != 'function') {
+        throw new TypeError(FUNC_ERROR_TEXT);
+      }
+      wait = toNumber(wait) || 0;
+      if (isObject(options)) {
+        leading = !!options.leading;
+        maxing = 'maxWait' in options;
+        maxWait = maxing ? nativeMax(toNumber(options.maxWait) || 0, wait) : maxWait;
+        trailing = 'trailing' in options ? !!options.trailing : trailing;
+      }
+
+      function invokeFunc(time) {
+        var args = lastArgs,
+            thisArg = lastThis;
+
+        lastArgs = lastThis = undefined;
+        lastInvokeTime = time;
+        result = func.apply(thisArg, args);
+        return result;
+      }
+
+      function leadingEdge(time) {
+        // Reset any `maxWait` timer.
+        lastInvokeTime = time;
+        // Start the timer for the trailing edge.
+        timerId = setTimeout(timerExpired, wait);
+        // Invoke the leading edge.
+        return leading ? invokeFunc(time) : result;
+      }
+
+      function remainingWait(time) {
+        var timeSinceLastCall = time - lastCallTime,
+            timeSinceLastInvoke = time - lastInvokeTime,
+            timeWaiting = wait - timeSinceLastCall;
+
+        return maxing
+          ? nativeMin(timeWaiting, maxWait - timeSinceLastInvoke)
+          : timeWaiting;
+      }
+
+      function shouldInvoke(time) {
+        var timeSinceLastCall = time - lastCallTime,
+            timeSinceLastInvoke = time - lastInvokeTime;
+
+        // Either this is the first call, activity has stopped and we're at the
+        // trailing edge, the system time has gone backwards and we're treating
+        // it as the trailing edge, or we've hit the `maxWait` limit.
+        return (lastCallTime === undefined || (timeSinceLastCall >= wait) ||
+          (timeSinceLastCall < 0) || (maxing && timeSinceLastInvoke >= maxWait));
+      }
+
+      function timerExpired() {
+        var time = now();
+        if (shouldInvoke(time)) {
+          return trailingEdge(time);
+        }
+        // Restart the timer.
+        timerId = setTimeout(timerExpired, remainingWait(time));
+      }
+
+      function trailingEdge(time) {
+        timerId = undefined;
+
+        // Only invoke if we have `lastArgs` which means `func` has been
+        // debounced at least once.
+        if (trailing && lastArgs) {
+          return invokeFunc(time);
+        }
+        lastArgs = lastThis = undefined;
+        return result;
+      }
+
+      function cancel() {
+        if (timerId !== undefined) {
+          clearTimeout(timerId);
+        }
+        lastInvokeTime = 0;
+        lastArgs = lastCallTime = lastThis = timerId = undefined;
+      }
+
+      function flush() {
+        return timerId === undefined ? result : trailingEdge(now());
+      }
+
+      function debounced() {
+        var time = now(),
+            isInvoking = shouldInvoke(time);
+
+        lastArgs = arguments;
+        lastThis = this;
+        lastCallTime = time;
+
+        if (isInvoking) {
+          if (timerId === undefined) {
+            return leadingEdge(lastCallTime);
+          }
+          if (maxing) {
+            // Handle invocations in a tight loop.
+            clearTimeout(timerId);
+            timerId = setTimeout(timerExpired, wait);
+            return invokeFunc(lastCallTime);
+          }
+        }
+        if (timerId === undefined) {
+          timerId = setTimeout(timerExpired, wait);
+        }
+        return result;
+      }
+      debounced.cancel = cancel;
+      debounced.flush = flush;
+      return debounced;
+    }
+
+    /**
+     * Defers invoking the `func` until the current call stack has cleared. Any
+     * additional arguments are provided to `func` when it's invoked.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Function
+     * @param {Function} func The function to defer.
+     * @param {...*} [args] The arguments to invoke `func` with.
+     * @returns {number} Returns the timer id.
+     * @example
+     *
+     * _.defer(function(text) {
+     *   console.log(text);
+     * }, 'deferred');
+     * // => Logs 'deferred' after one millisecond.
+     */
+    var defer = baseRest(function(func, args) {
+      return baseDelay(func, 1, args);
+    });
+
+    /**
+     * Invokes `func` after `wait` milliseconds. Any additional arguments are
+     * provided to `func` when it's invoked.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Function
+     * @param {Function} func The function to delay.
+     * @param {number} wait The number of milliseconds to delay invocation.
+     * @param {...*} [args] The arguments to invoke `func` with.
+     * @returns {number} Returns the timer id.
+     * @example
+     *
+     * _.delay(function(text) {
+     *   console.log(text);
+     * }, 1000, 'later');
+     * // => Logs 'later' after one second.
+     */
+    var delay = baseRest(function(func, wait, args) {
+      return baseDelay(func, toNumber(wait) || 0, args);
+    });
+
+    /**
+     * Creates a function that invokes `func` with arguments reversed.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Function
+     * @param {Function} func The function to flip arguments for.
+     * @returns {Function} Returns the new flipped function.
+     * @example
+     *
+     * var flipped = _.flip(function() {
+     *   return _.toArray(arguments);
+     * });
+     *
+     * flipped('a', 'b', 'c', 'd');
+     * // => ['d', 'c', 'b', 'a']
+     */
+    function flip(func) {
+      return createWrap(func, WRAP_FLIP_FLAG);
+    }
+
+    /**
+     * Creates a function that memoizes the result of `func`. If `resolver` is
+     * provided, it determines the cache key for storing the result based on the
+     * arguments provided to the memoized function. By default, the first argument
+     * provided to the memoized function is used as the map cache key. The `func`
+     * is invoked with the `this` binding of the memoized function.
+     *
+     * **Note:** The cache is exposed as the `cache` property on the memoized
+     * function. Its creation may be customized by replacing the `_.memoize.Cache`
+     * constructor with one whose instances implement the
+     * [`Map`](http://ecma-international.org/ecma-262/7.0/#sec-properties-of-the-map-prototype-object)
+     * method interface of `clear`, `delete`, `get`, `has`, and `set`.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Function
+     * @param {Function} func The function to have its output memoized.
+     * @param {Function} [resolver] The function to resolve the cache key.
+     * @returns {Function} Returns the new memoized function.
+     * @example
+     *
+     * var object = { 'a': 1, 'b': 2 };
+     * var other = { 'c': 3, 'd': 4 };
+     *
+     * var values = _.memoize(_.values);
+     * values(object);
+     * // => [1, 2]
+     *
+     * values(other);
+     * // => [3, 4]
+     *
+     * object.a = 2;
+     * values(object);
+     * // => [1, 2]
+     *
+     * // Modify the result cache.
+     * values.cache.set(object, ['a', 'b']);
+     * values(object);
+     * // => ['a', 'b']
+     *
+     * // Replace `_.memoize.Cache`.
+     * _.memoize.Cache = WeakMap;
+     */
+    function memoize(func, resolver) {
+      if (typeof func != 'function' || (resolver != null && typeof resolver != 'function')) {
+        throw new TypeError(FUNC_ERROR_TEXT);
+      }
+      var memoized = function() {
+        var args = arguments,
+            key = resolver ? resolver.apply(this, args) : args[0],
+            cache = memoized.cache;
+
+        if (cache.has(key)) {
+          return cache.get(key);
+        }
+        var result = func.apply(this, args);
+        memoized.cache = cache.set(key, result) || cache;
+        return result;
+      };
+      memoized.cache = new (memoize.Cache || MapCache);
+      return memoized;
+    }
+
+    // Expose `MapCache`.
+    memoize.Cache = MapCache;
+
+    /**
+     * Creates a function that negates the result of the predicate `func`. The
+     * `func` predicate is invoked with the `this` binding and arguments of the
+     * created function.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category Function
+     * @param {Function} predicate The predicate to negate.
+     * @returns {Function} Returns the new negated function.
+     * @example
+     *
+     * function isEven(n) {
+     *   return n % 2 == 0;
+     * }
+     *
+     * _.filter([1, 2, 3, 4, 5, 6], _.negate(isEven));
+     * // => [1, 3, 5]
+     */
+    function negate(predicate) {
+      if (typeof predicate != 'function') {
+        throw new TypeError(FUNC_ERROR_TEXT);
+      }
+      return function() {
+        var args = arguments;
+        switch (args.length) {
+          case 0: return !predicate.call(this);
+          case 1: return !predicate.call(this, args[0]);
+          case 2: return !predicate.call(this, args[0], args[1]);
+          case 3: return !predicate.call(this, args[0], args[1], args[2]);
+        }
+        return !predicate.apply(this, args);
+      };
+    }
+
+    /**
+     * Creates a function that is restricted to invoking `func` once. Repeat calls
+     * to the function return the value of the first invocation. The `func` is
+     * invoked with the `this` binding and arguments of the created function.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Function
+     * @param {Function} func The function to restrict.
+     * @returns {Function} Returns the new restricted function.
+     * @example
+     *
+     * var initialize = _.once(createApplication);
+     * initialize();
+     * initialize();
+     * // => `createApplication` is invoked once
+     */
+    function once(func) {
+      return before(2, func);
+    }
+
+    /**
+     * Creates a function that invokes `func` with its arguments transformed.
+     *
+     * @static
+     * @since 4.0.0
+     * @memberOf _
+     * @category Function
+     * @param {Function} func The function to wrap.
+     * @param {...(Function|Function[])} [transforms=[_.identity]]
+     *  The argument transforms.
+     * @returns {Function} Returns the new function.
+     * @example
+     *
+     * function doubled(n) {
+     *   return n * 2;
+     * }
+     *
+     * function square(n) {
+     *   return n * n;
+     * }
+     *
+     * var func = _.overArgs(function(x, y) {
+     *   return [x, y];
+     * }, [square, doubled]);
+     *
+     * func(9, 3);
+     * // => [81, 6]
+     *
+     * func(10, 5);
+     * // => [100, 10]
+     */
+    var overArgs = castRest(function(func, transforms) {
+      transforms = (transforms.length == 1 && isArray(transforms[0]))
+        ? arrayMap(transforms[0], baseUnary(getIteratee()))
+        : arrayMap(baseFlatten(transforms, 1), baseUnary(getIteratee()));
+
+      var funcsLength = transforms.length;
+      return baseRest(function(args) {
+        var index = -1,
+            length = nativeMin(args.length, funcsLength);
+
+        while (++index < length) {
+          args[index] = transforms[index].call(this, args[index]);
+        }
+        return apply(func, this, args);
+      });
+    });
+
+    /**
+     * Creates a function that invokes `func` with `partials` prepended to the
+     * arguments it receives. This method is like `_.bind` except it does **not**
+     * alter the `this` binding.
+     *
+     * The `_.partial.placeholder` value, which defaults to `_` in monolithic
+     * builds, may be used as a placeholder for partially applied arguments.
+     *
+     * **Note:** This method doesn't set the "length" property of partially
+     * applied functions.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.2.0
+     * @category Function
+     * @param {Function} func The function to partially apply arguments to.
+     * @param {...*} [partials] The arguments to be partially applied.
+     * @returns {Function} Returns the new partially applied function.
+     * @example
+     *
+     * function greet(greeting, name) {
+     *   return greeting + ' ' + name;
+     * }
+     *
+     * var sayHelloTo = _.partial(greet, 'hello');
+     * sayHelloTo('fred');
+     * // => 'hello fred'
+     *
+     * // Partially applied with placeholders.
+     * var greetFred = _.partial(greet, _, 'fred');
+     * greetFred('hi');
+     * // => 'hi fred'
+     */
+    var partial = baseRest(function(func, partials) {
+      var holders = replaceHolders(partials, getHolder(partial));
+      return createWrap(func, WRAP_PARTIAL_FLAG, undefined, partials, holders);
+    });
+
+    /**
+     * This method is like `_.partial` except that partially applied arguments
+     * are appended to the arguments it receives.
+     *
+     * The `_.partialRight.placeholder` value, which defaults to `_` in monolithic
+     * builds, may be used as a placeholder for partially applied arguments.
+     *
+     * **Note:** This method doesn't set the "length" property of partially
+     * applied functions.
+     *
+     * @static
+     * @memberOf _
+     * @since 1.0.0
+     * @category Function
+     * @param {Function} func The function to partially apply arguments to.
+     * @param {...*} [partials] The arguments to be partially applied.
+     * @returns {Function} Returns the new partially applied function.
+     * @example
+     *
+     * function greet(greeting, name) {
+     *   return greeting + ' ' + name;
+     * }
+     *
+     * var greetFred = _.partialRight(greet, 'fred');
+     * greetFred('hi');
+     * // => 'hi fred'
+     *
+     * // Partially applied with placeholders.
+     * var sayHelloTo = _.partialRight(greet, 'hello', _);
+     * sayHelloTo('fred');
+     * // => 'hello fred'
+     */
+    var partialRight = baseRest(function(func, partials) {
+      var holders = replaceHolders(partials, getHolder(partialRight));
+      return createWrap(func, WRAP_PARTIAL_RIGHT_FLAG, undefined, partials, holders);
+    });
+
+    /**
+     * Creates a function that invokes `func` with arguments arranged according
+     * to the specified `indexes` where the argument value at the first index is
+     * provided as the first argument, the argument value at the second index is
+     * provided as the second argument, and so on.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category Function
+     * @param {Function} func The function to rearrange arguments for.
+     * @param {...(number|number[])} indexes The arranged argument indexes.
+     * @returns {Function} Returns the new function.
+     * @example
+     *
+     * var rearged = _.rearg(function(a, b, c) {
+     *   return [a, b, c];
+     * }, [2, 0, 1]);
+     *
+     * rearged('b', 'c', 'a')
+     * // => ['a', 'b', 'c']
+     */
+    var rearg = flatRest(function(func, indexes) {
+      return createWrap(func, WRAP_REARG_FLAG, undefined, undefined, undefined, indexes);
+    });
+
+    /**
+     * Creates a function that invokes `func` with the `this` binding of the
+     * created function and arguments from `start` and beyond provided as
+     * an array.
+     *
+     * **Note:** This method is based on the
+     * [rest parameter](https://mdn.io/rest_parameters).
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Function
+     * @param {Function} func The function to apply a rest parameter to.
+     * @param {number} [start=func.length-1] The start position of the rest parameter.
+     * @returns {Function} Returns the new function.
+     * @example
+     *
+     * var say = _.rest(function(what, names) {
+     *   return what + ' ' + _.initial(names).join(', ') +
+     *     (_.size(names) > 1 ? ', & ' : '') + _.last(names);
+     * });
+     *
+     * say('hello', 'fred', 'barney', 'pebbles');
+     * // => 'hello fred, barney, & pebbles'
+     */
+    function rest(func, start) {
+      if (typeof func != 'function') {
+        throw new TypeError(FUNC_ERROR_TEXT);
+      }
+      start = start === undefined ? start : toInteger(start);
+      return baseRest(func, start);
+    }
+
+    /**
+     * Creates a function that invokes `func` with the `this` binding of the
+     * create function and an array of arguments much like
+     * [`Function#apply`](http://www.ecma-international.org/ecma-262/7.0/#sec-function.prototype.apply).
+     *
+     * **Note:** This method is based on the
+     * [spread operator](https://mdn.io/spread_operator).
+     *
+     * @static
+     * @memberOf _
+     * @since 3.2.0
+     * @category Function
+     * @param {Function} func The function to spread arguments over.
+     * @param {number} [start=0] The start position of the spread.
+     * @returns {Function} Returns the new function.
+     * @example
+     *
+     * var say = _.spread(function(who, what) {
+     *   return who + ' says ' + what;
+     * });
+     *
+     * say(['fred', 'hello']);
+     * // => 'fred says hello'
+     *
+     * var numbers = Promise.all([
+     *   Promise.resolve(40),
+     *   Promise.resolve(36)
+     * ]);
+     *
+     * numbers.then(_.spread(function(x, y) {
+     *   return x + y;
+     * }));
+     * // => a Promise of 76
+     */
+    function spread(func, start) {
+      if (typeof func != 'function') {
+        throw new TypeError(FUNC_ERROR_TEXT);
+      }
+      start = start == null ? 0 : nativeMax(toInteger(start), 0);
+      return baseRest(function(args) {
+        var array = args[start],
+            otherArgs = castSlice(args, 0, start);
+
+        if (array) {
+          arrayPush(otherArgs, array);
+        }
+        return apply(func, this, otherArgs);
+      });
+    }
+
+    /**
+     * Creates a throttled function that only invokes `func` at most once per
+     * every `wait` milliseconds. The throttled function comes with a `cancel`
+     * method to cancel delayed `func` invocations and a `flush` method to
+     * immediately invoke them. Provide `options` to indicate whether `func`
+     * should be invoked on the leading and/or trailing edge of the `wait`
+     * timeout. The `func` is invoked with the last arguments provided to the
+     * throttled function. Subsequent calls to the throttled function return the
+     * result of the last `func` invocation.
+     *
+     * **Note:** If `leading` and `trailing` options are `true`, `func` is
+     * invoked on the trailing edge of the timeout only if the throttled function
+     * is invoked more than once during the `wait` timeout.
+     *
+     * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred
+     * until to the next tick, similar to `setTimeout` with a timeout of `0`.
+     *
+     * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)
+     * for details over the differences between `_.throttle` and `_.debounce`.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Function
+     * @param {Function} func The function to throttle.
+     * @param {number} [wait=0] The number of milliseconds to throttle invocations to.
+     * @param {Object} [options={}] The options object.
+     * @param {boolean} [options.leading=true]
+     *  Specify invoking on the leading edge of the timeout.
+     * @param {boolean} [options.trailing=true]
+     *  Specify invoking on the trailing edge of the timeout.
+     * @returns {Function} Returns the new throttled function.
+     * @example
+     *
+     * // Avoid excessively updating the position while scrolling.
+     * jQuery(window).on('scroll', _.throttle(updatePosition, 100));
+     *
+     * // Invoke `renewToken` when the click event is fired, but not more than once every 5 minutes.
+     * var throttled = _.throttle(renewToken, 300000, { 'trailing': false });
+     * jQuery(element).on('click', throttled);
+     *
+     * // Cancel the trailing throttled invocation.
+     * jQuery(window).on('popstate', throttled.cancel);
+     */
+    function throttle(func, wait, options) {
+      var leading = true,
+          trailing = true;
+
+      if (typeof func != 'function') {
+        throw new TypeError(FUNC_ERROR_TEXT);
+      }
+      if (isObject(options)) {
+        leading = 'leading' in options ? !!options.leading : leading;
+        trailing = 'trailing' in options ? !!options.trailing : trailing;
+      }
+      return debounce(func, wait, {
+        'leading': leading,
+        'maxWait': wait,
+        'trailing': trailing
+      });
+    }
+
+    /**
+     * Creates a function that accepts up to one argument, ignoring any
+     * additional arguments.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Function
+     * @param {Function} func The function to cap arguments for.
+     * @returns {Function} Returns the new capped function.
+     * @example
+     *
+     * _.map(['6', '8', '10'], _.unary(parseInt));
+     * // => [6, 8, 10]
+     */
+    function unary(func) {
+      return ary(func, 1);
+    }
+
+    /**
+     * Creates a function that provides `value` to `wrapper` as its first
+     * argument. Any additional arguments provided to the function are appended
+     * to those provided to the `wrapper`. The wrapper is invoked with the `this`
+     * binding of the created function.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Function
+     * @param {*} value The value to wrap.
+     * @param {Function} [wrapper=identity] The wrapper function.
+     * @returns {Function} Returns the new function.
+     * @example
+     *
+     * var p = _.wrap(_.escape, function(func, text) {
+     *   return '<p>' + func(text) + '</p>';
+     * });
+     *
+     * p('fred, barney, & pebbles');
+     * // => '<p>fred, barney, &amp; pebbles</p>'
+     */
+    function wrap(value, wrapper) {
+      return partial(castFunction(wrapper), value);
+    }
+
+    /*------------------------------------------------------------------------*/
+
+    /**
+     * Casts `value` as an array if it's not one.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.4.0
+     * @category Lang
+     * @param {*} value The value to inspect.
+     * @returns {Array} Returns the cast array.
+     * @example
+     *
+     * _.castArray(1);
+     * // => [1]
+     *
+     * _.castArray({ 'a': 1 });
+     * // => [{ 'a': 1 }]
+     *
+     * _.castArray('abc');
+     * // => ['abc']
+     *
+     * _.castArray(null);
+     * // => [null]
+     *
+     * _.castArray(undefined);
+     * // => [undefined]
+     *
+     * _.castArray();
+     * // => []
+     *
+     * var array = [1, 2, 3];
+     * console.log(_.castArray(array) === array);
+     * // => true
+     */
+    function castArray() {
+      if (!arguments.length) {
+        return [];
+      }
+      var value = arguments[0];
+      return isArray(value) ? value : [value];
+    }
+
+    /**
+     * Creates a shallow clone of `value`.
+     *
+     * **Note:** This method is loosely based on the
+     * [structured clone algorithm](https://mdn.io/Structured_clone_algorithm)
+     * and supports cloning arrays, array buffers, booleans, date objects, maps,
+     * numbers, `Object` objects, regexes, sets, strings, symbols, and typed
+     * arrays. The own enumerable properties of `arguments` objects are cloned
+     * as plain objects. An empty object is returned for uncloneable values such
+     * as error objects, functions, DOM nodes, and WeakMaps.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Lang
+     * @param {*} value The value to clone.
+     * @returns {*} Returns the cloned value.
+     * @see _.cloneDeep
+     * @example
+     *
+     * var objects = [{ 'a': 1 }, { 'b': 2 }];
+     *
+     * var shallow = _.clone(objects);
+     * console.log(shallow[0] === objects[0]);
+     * // => true
+     */
+    function clone(value) {
+      return baseClone(value, CLONE_SYMBOLS_FLAG);
+    }
+
+    /**
+     * This method is like `_.clone` except that it accepts `customizer` which
+     * is invoked to produce the cloned value. If `customizer` returns `undefined`,
+     * cloning is handled by the method instead. The `customizer` is invoked with
+     * up to four arguments; (value [, index|key, object, stack]).
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Lang
+     * @param {*} value The value to clone.
+     * @param {Function} [customizer] The function to customize cloning.
+     * @returns {*} Returns the cloned value.
+     * @see _.cloneDeepWith
+     * @example
+     *
+     * function customizer(value) {
+     *   if (_.isElement(value)) {
+     *     return value.cloneNode(false);
+     *   }
+     * }
+     *
+     * var el = _.cloneWith(document.body, customizer);
+     *
+     * console.log(el === document.body);
+     * // => false
+     * console.log(el.nodeName);
+     * // => 'BODY'
+     * console.log(el.childNodes.length);
+     * // => 0
+     */
+    function cloneWith(value, customizer) {
+      customizer = typeof customizer == 'function' ? customizer : undefined;
+      return baseClone(value, CLONE_SYMBOLS_FLAG, customizer);
+    }
+
+    /**
+     * This method is like `_.clone` except that it recursively clones `value`.
+     *
+     * @static
+     * @memberOf _
+     * @since 1.0.0
+     * @category Lang
+     * @param {*} value The value to recursively clone.
+     * @returns {*} Returns the deep cloned value.
+     * @see _.clone
+     * @example
+     *
+     * var objects = [{ 'a': 1 }, { 'b': 2 }];
+     *
+     * var deep = _.cloneDeep(objects);
+     * console.log(deep[0] === objects[0]);
+     * // => false
+     */
+    function cloneDeep(value) {
+      return baseClone(value, CLONE_DEEP_FLAG | CLONE_SYMBOLS_FLAG);
+    }
+
+    /**
+     * This method is like `_.cloneWith` except that it recursively clones `value`.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Lang
+     * @param {*} value The value to recursively clone.
+     * @param {Function} [customizer] The function to customize cloning.
+     * @returns {*} Returns the deep cloned value.
+     * @see _.cloneWith
+     * @example
+     *
+     * function customizer(value) {
+     *   if (_.isElement(value)) {
+     *     return value.cloneNode(true);
+     *   }
+     * }
+     *
+     * var el = _.cloneDeepWith(document.body, customizer);
+     *
+     * console.log(el === document.body);
+     * // => false
+     * console.log(el.nodeName);
+     * // => 'BODY'
+     * console.log(el.childNodes.length);
+     * // => 20
+     */
+    function cloneDeepWith(value, customizer) {
+      customizer = typeof customizer == 'function' ? customizer : undefined;
+      return baseClone(value, CLONE_DEEP_FLAG | CLONE_SYMBOLS_FLAG, customizer);
+    }
+
+    /**
+     * Checks if `object` conforms to `source` by invoking the predicate
+     * properties of `source` with the corresponding property values of `object`.
+     *
+     * **Note:** This method is equivalent to `_.conforms` when `source` is
+     * partially applied.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.14.0
+     * @category Lang
+     * @param {Object} object The object to inspect.
+     * @param {Object} source The object of property predicates to conform to.
+     * @returns {boolean} Returns `true` if `object` conforms, else `false`.
+     * @example
+     *
+     * var object = { 'a': 1, 'b': 2 };
+     *
+     * _.conformsTo(object, { 'b': function(n) { return n > 1; } });
+     * // => true
+     *
+     * _.conformsTo(object, { 'b': function(n) { return n > 2; } });
+     * // => false
+     */
+    function conformsTo(object, source) {
+      return source == null || baseConformsTo(object, source, keys(source));
+    }
+
+    /**
+     * Performs a
+     * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
+     * comparison between two values to determine if they are equivalent.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Lang
+     * @param {*} value The value to compare.
+     * @param {*} other The other value to compare.
+     * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
+     * @example
+     *
+     * var object = { 'a': 1 };
+     * var other = { 'a': 1 };
+     *
+     * _.eq(object, object);
+     * // => true
+     *
+     * _.eq(object, other);
+     * // => false
+     *
+     * _.eq('a', 'a');
+     * // => true
+     *
+     * _.eq('a', Object('a'));
+     * // => false
+     *
+     * _.eq(NaN, NaN);
+     * // => true
+     */
+    function eq(value, other) {
+      return value === other || (value !== value && other !== other);
+    }
+
+    /**
+     * Checks if `value` is greater than `other`.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.9.0
+     * @category Lang
+     * @param {*} value The value to compare.
+     * @param {*} other The other value to compare.
+     * @returns {boolean} Returns `true` if `value` is greater than `other`,
+     *  else `false`.
+     * @see _.lt
+     * @example
+     *
+     * _.gt(3, 1);
+     * // => true
+     *
+     * _.gt(3, 3);
+     * // => false
+     *
+     * _.gt(1, 3);
+     * // => false
+     */
+    var gt = createRelationalOperation(baseGt);
+
+    /**
+     * Checks if `value` is greater than or equal to `other`.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.9.0
+     * @category Lang
+     * @param {*} value The value to compare.
+     * @param {*} other The other value to compare.
+     * @returns {boolean} Returns `true` if `value` is greater than or equal to
+     *  `other`, else `false`.
+     * @see _.lte
+     * @example
+     *
+     * _.gte(3, 1);
+     * // => true
+     *
+     * _.gte(3, 3);
+     * // => true
+     *
+     * _.gte(1, 3);
+     * // => false
+     */
+    var gte = createRelationalOperation(function(value, other) {
+      return value >= other;
+    });
+
+    /**
+     * Checks if `value` is likely an `arguments` object.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is an `arguments` object,
+     *  else `false`.
+     * @example
+     *
+     * _.isArguments(function() { return arguments; }());
+     * // => true
+     *
+     * _.isArguments([1, 2, 3]);
+     * // => false
+     */
+    var isArguments = baseIsArguments(function() { return arguments; }()) ? baseIsArguments : function(value) {
+      return isObjectLike(value) && hasOwnProperty.call(value, 'callee') &&
+        !propertyIsEnumerable.call(value, 'callee');
+    };
+
+    /**
+     * Checks if `value` is classified as an `Array` object.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is an array, else `false`.
+     * @example
+     *
+     * _.isArray([1, 2, 3]);
+     * // => true
+     *
+     * _.isArray(document.body.children);
+     * // => false
+     *
+     * _.isArray('abc');
+     * // => false
+     *
+     * _.isArray(_.noop);
+     * // => false
+     */
+    var isArray = Array.isArray;
+
+    /**
+     * Checks if `value` is classified as an `ArrayBuffer` object.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.3.0
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is an array buffer, else `false`.
+     * @example
+     *
+     * _.isArrayBuffer(new ArrayBuffer(2));
+     * // => true
+     *
+     * _.isArrayBuffer(new Array(2));
+     * // => false
+     */
+    var isArrayBuffer = nodeIsArrayBuffer ? baseUnary(nodeIsArrayBuffer) : baseIsArrayBuffer;
+
+    /**
+     * Checks if `value` is array-like. A value is considered array-like if it's
+     * not a function and has a `value.length` that's an integer greater than or
+     * equal to `0` and less than or equal to `Number.MAX_SAFE_INTEGER`.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is array-like, else `false`.
+     * @example
+     *
+     * _.isArrayLike([1, 2, 3]);
+     * // => true
+     *
+     * _.isArrayLike(document.body.children);
+     * // => true
+     *
+     * _.isArrayLike('abc');
+     * // => true
+     *
+     * _.isArrayLike(_.noop);
+     * // => false
+     */
+    function isArrayLike(value) {
+      return value != null && isLength(value.length) && !isFunction(value);
+    }
+
+    /**
+     * This method is like `_.isArrayLike` except that it also checks if `value`
+     * is an object.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is an array-like object,
+     *  else `false`.
+     * @example
+     *
+     * _.isArrayLikeObject([1, 2, 3]);
+     * // => true
+     *
+     * _.isArrayLikeObject(document.body.children);
+     * // => true
+     *
+     * _.isArrayLikeObject('abc');
+     * // => false
+     *
+     * _.isArrayLikeObject(_.noop);
+     * // => false
+     */
+    function isArrayLikeObject(value) {
+      return isObjectLike(value) && isArrayLike(value);
+    }
+
+    /**
+     * Checks if `value` is classified as a boolean primitive or object.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a boolean, else `false`.
+     * @example
+     *
+     * _.isBoolean(false);
+     * // => true
+     *
+     * _.isBoolean(null);
+     * // => false
+     */
+    function isBoolean(value) {
+      return value === true || value === false ||
+        (isObjectLike(value) && baseGetTag(value) == boolTag);
+    }
+
+    /**
+     * Checks if `value` is a buffer.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.3.0
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a buffer, else `false`.
+     * @example
+     *
+     * _.isBuffer(new Buffer(2));
+     * // => true
+     *
+     * _.isBuffer(new Uint8Array(2));
+     * // => false
+     */
+    var isBuffer = nativeIsBuffer || stubFalse;
+
+    /**
+     * Checks if `value` is classified as a `Date` object.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a date object, else `false`.
+     * @example
+     *
+     * _.isDate(new Date);
+     * // => true
+     *
+     * _.isDate('Mon April 23 2012');
+     * // => false
+     */
+    var isDate = nodeIsDate ? baseUnary(nodeIsDate) : baseIsDate;
+
+    /**
+     * Checks if `value` is likely a DOM element.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a DOM element, else `false`.
+     * @example
+     *
+     * _.isElement(document.body);
+     * // => true
+     *
+     * _.isElement('<body>');
+     * // => false
+     */
+    function isElement(value) {
+      return isObjectLike(value) && value.nodeType === 1 && !isPlainObject(value);
+    }
+
+    /**
+     * Checks if `value` is an empty object, collection, map, or set.
+     *
+     * Objects are considered empty if they have no own enumerable string keyed
+     * properties.
+     *
+     * Array-like values such as `arguments` objects, arrays, buffers, strings, or
+     * jQuery-like collections are considered empty if they have a `length` of `0`.
+     * Similarly, maps and sets are considered empty if they have a `size` of `0`.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is empty, else `false`.
+     * @example
+     *
+     * _.isEmpty(null);
+     * // => true
+     *
+     * _.isEmpty(true);
+     * // => true
+     *
+     * _.isEmpty(1);
+     * // => true
+     *
+     * _.isEmpty([1, 2, 3]);
+     * // => false
+     *
+     * _.isEmpty({ 'a': 1 });
+     * // => false
+     */
+    function isEmpty(value) {
+      if (value == null) {
+        return true;
+      }
+      if (isArrayLike(value) &&
+          (isArray(value) || typeof value == 'string' || typeof value.splice == 'function' ||
+            isBuffer(value) || isTypedArray(value) || isArguments(value))) {
+        return !value.length;
+      }
+      var tag = getTag(value);
+      if (tag == mapTag || tag == setTag) {
+        return !value.size;
+      }
+      if (isPrototype(value)) {
+        return !baseKeys(value).length;
+      }
+      for (var key in value) {
+        if (hasOwnProperty.call(value, key)) {
+          return false;
+        }
+      }
+      return true;
+    }
+
+    /**
+     * Performs a deep comparison between two values to determine if they are
+     * equivalent.
+     *
+     * **Note:** This method supports comparing arrays, array buffers, booleans,
+     * date objects, error objects, maps, numbers, `Object` objects, regexes,
+     * sets, strings, symbols, and typed arrays. `Object` objects are compared
+     * by their own, not inherited, enumerable properties. Functions and DOM
+     * nodes are compared by strict equality, i.e. `===`.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Lang
+     * @param {*} value The value to compare.
+     * @param {*} other The other value to compare.
+     * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
+     * @example
+     *
+     * var object = { 'a': 1 };
+     * var other = { 'a': 1 };
+     *
+     * _.isEqual(object, other);
+     * // => true
+     *
+     * object === other;
+     * // => false
+     */
+    function isEqual(value, other) {
+      return baseIsEqual(value, other);
+    }
+
+    /**
+     * This method is like `_.isEqual` except that it accepts `customizer` which
+     * is invoked to compare values. If `customizer` returns `undefined`, comparisons
+     * are handled by the method instead. The `customizer` is invoked with up to
+     * six arguments: (objValue, othValue [, index|key, object, other, stack]).
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Lang
+     * @param {*} value The value to compare.
+     * @param {*} other The other value to compare.
+     * @param {Function} [customizer] The function to customize comparisons.
+     * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
+     * @example
+     *
+     * function isGreeting(value) {
+     *   return /^h(?:i|ello)$/.test(value);
+     * }
+     *
+     * function customizer(objValue, othValue) {
+     *   if (isGreeting(objValue) && isGreeting(othValue)) {
+     *     return true;
+     *   }
+     * }
+     *
+     * var array = ['hello', 'goodbye'];
+     * var other = ['hi', 'goodbye'];
+     *
+     * _.isEqualWith(array, other, customizer);
+     * // => true
+     */
+    function isEqualWith(value, other, customizer) {
+      customizer = typeof customizer == 'function' ? customizer : undefined;
+      var result = customizer ? customizer(value, other) : undefined;
+      return result === undefined ? baseIsEqual(value, other, undefined, customizer) : !!result;
+    }
+
+    /**
+     * Checks if `value` is an `Error`, `EvalError`, `RangeError`, `ReferenceError`,
+     * `SyntaxError`, `TypeError`, or `URIError` object.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is an error object, else `false`.
+     * @example
+     *
+     * _.isError(new Error);
+     * // => true
+     *
+     * _.isError(Error);
+     * // => false
+     */
+    function isError(value) {
+      if (!isObjectLike(value)) {
+        return false;
+      }
+      var tag = baseGetTag(value);
+      return tag == errorTag || tag == domExcTag ||
+        (typeof value.message == 'string' && typeof value.name == 'string' && !isPlainObject(value));
+    }
+
+    /**
+     * Checks if `value` is a finite primitive number.
+     *
+     * **Note:** This method is based on
+     * [`Number.isFinite`](https://mdn.io/Number/isFinite).
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a finite number, else `false`.
+     * @example
+     *
+     * _.isFinite(3);
+     * // => true
+     *
+     * _.isFinite(Number.MIN_VALUE);
+     * // => true
+     *
+     * _.isFinite(Infinity);
+     * // => false
+     *
+     * _.isFinite('3');
+     * // => false
+     */
+    function isFinite(value) {
+      return typeof value == 'number' && nativeIsFinite(value);
+    }
+
+    /**
+     * Checks if `value` is classified as a `Function` object.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a function, else `false`.
+     * @example
+     *
+     * _.isFunction(_);
+     * // => true
+     *
+     * _.isFunction(/abc/);
+     * // => false
+     */
+    function isFunction(value) {
+      if (!isObject(value)) {
+        return false;
+      }
+      // The use of `Object#toString` avoids issues with the `typeof` operator
+      // in Safari 9 which returns 'object' for typed arrays and other constructors.
+      var tag = baseGetTag(value);
+      return tag == funcTag || tag == genTag || tag == asyncTag || tag == proxyTag;
+    }
+
+    /**
+     * Checks if `value` is an integer.
+     *
+     * **Note:** This method is based on
+     * [`Number.isInteger`](https://mdn.io/Number/isInteger).
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is an integer, else `false`.
+     * @example
+     *
+     * _.isInteger(3);
+     * // => true
+     *
+     * _.isInteger(Number.MIN_VALUE);
+     * // => false
+     *
+     * _.isInteger(Infinity);
+     * // => false
+     *
+     * _.isInteger('3');
+     * // => false
+     */
+    function isInteger(value) {
+      return typeof value == 'number' && value == toInteger(value);
+    }
+
+    /**
+     * Checks if `value` is a valid array-like length.
+     *
+     * **Note:** This method is loosely based on
+     * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
+     * @example
+     *
+     * _.isLength(3);
+     * // => true
+     *
+     * _.isLength(Number.MIN_VALUE);
+     * // => false
+     *
+     * _.isLength(Infinity);
+     * // => false
+     *
+     * _.isLength('3');
+     * // => false
+     */
+    function isLength(value) {
+      return typeof value == 'number' &&
+        value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;
+    }
+
+    /**
+     * Checks if `value` is the
+     * [language type](http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-language-types)
+     * of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is an object, else `false`.
+     * @example
+     *
+     * _.isObject({});
+     * // => true
+     *
+     * _.isObject([1, 2, 3]);
+     * // => true
+     *
+     * _.isObject(_.noop);
+     * // => true
+     *
+     * _.isObject(null);
+     * // => false
+     */
+    function isObject(value) {
+      var type = typeof value;
+      return value != null && (type == 'object' || type == 'function');
+    }
+
+    /**
+     * Checks if `value` is object-like. A value is object-like if it's not `null`
+     * and has a `typeof` result of "object".
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is object-like, else `false`.
+     * @example
+     *
+     * _.isObjectLike({});
+     * // => true
+     *
+     * _.isObjectLike([1, 2, 3]);
+     * // => true
+     *
+     * _.isObjectLike(_.noop);
+     * // => false
+     *
+     * _.isObjectLike(null);
+     * // => false
+     */
+    function isObjectLike(value) {
+      return value != null && typeof value == 'object';
+    }
+
+    /**
+     * Checks if `value` is classified as a `Map` object.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.3.0
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a map, else `false`.
+     * @example
+     *
+     * _.isMap(new Map);
+     * // => true
+     *
+     * _.isMap(new WeakMap);
+     * // => false
+     */
+    var isMap = nodeIsMap ? baseUnary(nodeIsMap) : baseIsMap;
+
+    /**
+     * Performs a partial deep comparison between `object` and `source` to
+     * determine if `object` contains equivalent property values.
+     *
+     * **Note:** This method is equivalent to `_.matches` when `source` is
+     * partially applied.
+     *
+     * Partial comparisons will match empty array and empty object `source`
+     * values against any array or object value, respectively. See `_.isEqual`
+     * for a list of supported value comparisons.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category Lang
+     * @param {Object} object The object to inspect.
+     * @param {Object} source The object of property values to match.
+     * @returns {boolean} Returns `true` if `object` is a match, else `false`.
+     * @example
+     *
+     * var object = { 'a': 1, 'b': 2 };
+     *
+     * _.isMatch(object, { 'b': 2 });
+     * // => true
+     *
+     * _.isMatch(object, { 'b': 1 });
+     * // => false
+     */
+    function isMatch(object, source) {
+      return object === source || baseIsMatch(object, source, getMatchData(source));
+    }
+
+    /**
+     * This method is like `_.isMatch` except that it accepts `customizer` which
+     * is invoked to compare values. If `customizer` returns `undefined`, comparisons
+     * are handled by the method instead. The `customizer` is invoked with five
+     * arguments: (objValue, srcValue, index|key, object, source).
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Lang
+     * @param {Object} object The object to inspect.
+     * @param {Object} source The object of property values to match.
+     * @param {Function} [customizer] The function to customize comparisons.
+     * @returns {boolean} Returns `true` if `object` is a match, else `false`.
+     * @example
+     *
+     * function isGreeting(value) {
+     *   return /^h(?:i|ello)$/.test(value);
+     * }
+     *
+     * function customizer(objValue, srcValue) {
+     *   if (isGreeting(objValue) && isGreeting(srcValue)) {
+     *     return true;
+     *   }
+     * }
+     *
+     * var object = { 'greeting': 'hello' };
+     * var source = { 'greeting': 'hi' };
+     *
+     * _.isMatchWith(object, source, customizer);
+     * // => true
+     */
+    function isMatchWith(object, source, customizer) {
+      customizer = typeof customizer == 'function' ? customizer : undefined;
+      return baseIsMatch(object, source, getMatchData(source), customizer);
+    }
+
+    /**
+     * Checks if `value` is `NaN`.
+     *
+     * **Note:** This method is based on
+     * [`Number.isNaN`](https://mdn.io/Number/isNaN) and is not the same as
+     * global [`isNaN`](https://mdn.io/isNaN) which returns `true` for
+     * `undefined` and other non-number values.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`.
+     * @example
+     *
+     * _.isNaN(NaN);
+     * // => true
+     *
+     * _.isNaN(new Number(NaN));
+     * // => true
+     *
+     * isNaN(undefined);
+     * // => true
+     *
+     * _.isNaN(undefined);
+     * // => false
+     */
+    function isNaN(value) {
+      // An `NaN` primitive is the only value that is not equal to itself.
+      // Perform the `toStringTag` check first to avoid errors with some
+      // ActiveX objects in IE.
+      return isNumber(value) && value != +value;
+    }
+
+    /**
+     * Checks if `value` is a pristine native function.
+     *
+     * **Note:** This method can't reliably detect native functions in the presence
+     * of the core-js package because core-js circumvents this kind of detection.
+     * Despite multiple requests, the core-js maintainer has made it clear: any
+     * attempt to fix the detection will be obstructed. As a result, we're left
+     * with little choice but to throw an error. Unfortunately, this also affects
+     * packages, like [babel-polyfill](https://www.npmjs.com/package/babel-polyfill),
+     * which rely on core-js.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a native function,
+     *  else `false`.
+     * @example
+     *
+     * _.isNative(Array.prototype.push);
+     * // => true
+     *
+     * _.isNative(_);
+     * // => false
+     */
+    function isNative(value) {
+      if (isMaskable(value)) {
+        throw new Error(CORE_ERROR_TEXT);
+      }
+      return baseIsNative(value);
+    }
+
+    /**
+     * Checks if `value` is `null`.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is `null`, else `false`.
+     * @example
+     *
+     * _.isNull(null);
+     * // => true
+     *
+     * _.isNull(void 0);
+     * // => false
+     */
+    function isNull(value) {
+      return value === null;
+    }
+
+    /**
+     * Checks if `value` is `null` or `undefined`.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is nullish, else `false`.
+     * @example
+     *
+     * _.isNil(null);
+     * // => true
+     *
+     * _.isNil(void 0);
+     * // => true
+     *
+     * _.isNil(NaN);
+     * // => false
+     */
+    function isNil(value) {
+      return value == null;
+    }
+
+    /**
+     * Checks if `value` is classified as a `Number` primitive or object.
+     *
+     * **Note:** To exclude `Infinity`, `-Infinity`, and `NaN`, which are
+     * classified as numbers, use the `_.isFinite` method.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a number, else `false`.
+     * @example
+     *
+     * _.isNumber(3);
+     * // => true
+     *
+     * _.isNumber(Number.MIN_VALUE);
+     * // => true
+     *
+     * _.isNumber(Infinity);
+     * // => true
+     *
+     * _.isNumber('3');
+     * // => false
+     */
+    function isNumber(value) {
+      return typeof value == 'number' ||
+        (isObjectLike(value) && baseGetTag(value) == numberTag);
+    }
+
+    /**
+     * Checks if `value` is a plain object, that is, an object created by the
+     * `Object` constructor or one with a `[[Prototype]]` of `null`.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.8.0
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a plain object, else `false`.
+     * @example
+     *
+     * function Foo() {
+     *   this.a = 1;
+     * }
+     *
+     * _.isPlainObject(new Foo);
+     * // => false
+     *
+     * _.isPlainObject([1, 2, 3]);
+     * // => false
+     *
+     * _.isPlainObject({ 'x': 0, 'y': 0 });
+     * // => true
+     *
+     * _.isPlainObject(Object.create(null));
+     * // => true
+     */
+    function isPlainObject(value) {
+      if (!isObjectLike(value) || baseGetTag(value) != objectTag) {
+        return false;
+      }
+      var proto = getPrototype(value);
+      if (proto === null) {
+        return true;
+      }
+      var Ctor = hasOwnProperty.call(proto, 'constructor') && proto.constructor;
+      return typeof Ctor == 'function' && Ctor instanceof Ctor &&
+        funcToString.call(Ctor) == objectCtorString;
+    }
+
+    /**
+     * Checks if `value` is classified as a `RegExp` object.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.1.0
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a regexp, else `false`.
+     * @example
+     *
+     * _.isRegExp(/abc/);
+     * // => true
+     *
+     * _.isRegExp('/abc/');
+     * // => false
+     */
+    var isRegExp = nodeIsRegExp ? baseUnary(nodeIsRegExp) : baseIsRegExp;
+
+    /**
+     * Checks if `value` is a safe integer. An integer is safe if it's an IEEE-754
+     * double precision number which isn't the result of a rounded unsafe integer.
+     *
+     * **Note:** This method is based on
+     * [`Number.isSafeInteger`](https://mdn.io/Number/isSafeInteger).
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a safe integer, else `false`.
+     * @example
+     *
+     * _.isSafeInteger(3);
+     * // => true
+     *
+     * _.isSafeInteger(Number.MIN_VALUE);
+     * // => false
+     *
+     * _.isSafeInteger(Infinity);
+     * // => false
+     *
+     * _.isSafeInteger('3');
+     * // => false
+     */
+    function isSafeInteger(value) {
+      return isInteger(value) && value >= -MAX_SAFE_INTEGER && value <= MAX_SAFE_INTEGER;
+    }
+
+    /**
+     * Checks if `value` is classified as a `Set` object.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.3.0
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a set, else `false`.
+     * @example
+     *
+     * _.isSet(new Set);
+     * // => true
+     *
+     * _.isSet(new WeakSet);
+     * // => false
+     */
+    var isSet = nodeIsSet ? baseUnary(nodeIsSet) : baseIsSet;
+
+    /**
+     * Checks if `value` is classified as a `String` primitive or object.
+     *
+     * @static
+     * @since 0.1.0
+     * @memberOf _
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a string, else `false`.
+     * @example
+     *
+     * _.isString('abc');
+     * // => true
+     *
+     * _.isString(1);
+     * // => false
+     */
+    function isString(value) {
+      return typeof value == 'string' ||
+        (!isArray(value) && isObjectLike(value) && baseGetTag(value) == stringTag);
+    }
+
+    /**
+     * Checks if `value` is classified as a `Symbol` primitive or object.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a symbol, else `false`.
+     * @example
+     *
+     * _.isSymbol(Symbol.iterator);
+     * // => true
+     *
+     * _.isSymbol('abc');
+     * // => false
+     */
+    function isSymbol(value) {
+      return typeof value == 'symbol' ||
+        (isObjectLike(value) && baseGetTag(value) == symbolTag);
+    }
+
+    /**
+     * Checks if `value` is classified as a typed array.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a typed array, else `false`.
+     * @example
+     *
+     * _.isTypedArray(new Uint8Array);
+     * // => true
+     *
+     * _.isTypedArray([]);
+     * // => false
+     */
+    var isTypedArray = nodeIsTypedArray ? baseUnary(nodeIsTypedArray) : baseIsTypedArray;
+
+    /**
+     * Checks if `value` is `undefined`.
+     *
+     * @static
+     * @since 0.1.0
+     * @memberOf _
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is `undefined`, else `false`.
+     * @example
+     *
+     * _.isUndefined(void 0);
+     * // => true
+     *
+     * _.isUndefined(null);
+     * // => false
+     */
+    function isUndefined(value) {
+      return value === undefined;
+    }
+
+    /**
+     * Checks if `value` is classified as a `WeakMap` object.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.3.0
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a weak map, else `false`.
+     * @example
+     *
+     * _.isWeakMap(new WeakMap);
+     * // => true
+     *
+     * _.isWeakMap(new Map);
+     * // => false
+     */
+    function isWeakMap(value) {
+      return isObjectLike(value) && getTag(value) == weakMapTag;
+    }
+
+    /**
+     * Checks if `value` is classified as a `WeakSet` object.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.3.0
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a weak set, else `false`.
+     * @example
+     *
+     * _.isWeakSet(new WeakSet);
+     * // => true
+     *
+     * _.isWeakSet(new Set);
+     * // => false
+     */
+    function isWeakSet(value) {
+      return isObjectLike(value) && baseGetTag(value) == weakSetTag;
+    }
+
+    /**
+     * Checks if `value` is less than `other`.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.9.0
+     * @category Lang
+     * @param {*} value The value to compare.
+     * @param {*} other The other value to compare.
+     * @returns {boolean} Returns `true` if `value` is less than `other`,
+     *  else `false`.
+     * @see _.gt
+     * @example
+     *
+     * _.lt(1, 3);
+     * // => true
+     *
+     * _.lt(3, 3);
+     * // => false
+     *
+     * _.lt(3, 1);
+     * // => false
+     */
+    var lt = createRelationalOperation(baseLt);
+
+    /**
+     * Checks if `value` is less than or equal to `other`.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.9.0
+     * @category Lang
+     * @param {*} value The value to compare.
+     * @param {*} other The other value to compare.
+     * @returns {boolean} Returns `true` if `value` is less than or equal to
+     *  `other`, else `false`.
+     * @see _.gte
+     * @example
+     *
+     * _.lte(1, 3);
+     * // => true
+     *
+     * _.lte(3, 3);
+     * // => true
+     *
+     * _.lte(3, 1);
+     * // => false
+     */
+    var lte = createRelationalOperation(function(value, other) {
+      return value <= other;
+    });
+
+    /**
+     * Converts `value` to an array.
+     *
+     * @static
+     * @since 0.1.0
+     * @memberOf _
+     * @category Lang
+     * @param {*} value The value to convert.
+     * @returns {Array} Returns the converted array.
+     * @example
+     *
+     * _.toArray({ 'a': 1, 'b': 2 });
+     * // => [1, 2]
+     *
+     * _.toArray('abc');
+     * // => ['a', 'b', 'c']
+     *
+     * _.toArray(1);
+     * // => []
+     *
+     * _.toArray(null);
+     * // => []
+     */
+    function toArray(value) {
+      if (!value) {
+        return [];
+      }
+      if (isArrayLike(value)) {
+        return isString(value) ? stringToArray(value) : copyArray(value);
+      }
+      if (symIterator && value[symIterator]) {
+        return iteratorToArray(value[symIterator]());
+      }
+      var tag = getTag(value),
+          func = tag == mapTag ? mapToArray : (tag == setTag ? setToArray : values);
+
+      return func(value);
+    }
+
+    /**
+     * Converts `value` to a finite number.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.12.0
+     * @category Lang
+     * @param {*} value The value to convert.
+     * @returns {number} Returns the converted number.
+     * @example
+     *
+     * _.toFinite(3.2);
+     * // => 3.2
+     *
+     * _.toFinite(Number.MIN_VALUE);
+     * // => 5e-324
+     *
+     * _.toFinite(Infinity);
+     * // => 1.7976931348623157e+308
+     *
+     * _.toFinite('3.2');
+     * // => 3.2
+     */
+    function toFinite(value) {
+      if (!value) {
+        return value === 0 ? value : 0;
+      }
+      value = toNumber(value);
+      if (value === INFINITY || value === -INFINITY) {
+        var sign = (value < 0 ? -1 : 1);
+        return sign * MAX_INTEGER;
+      }
+      return value === value ? value : 0;
+    }
+
+    /**
+     * Converts `value` to an integer.
+     *
+     * **Note:** This method is loosely based on
+     * [`ToInteger`](http://www.ecma-international.org/ecma-262/7.0/#sec-tointeger).
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Lang
+     * @param {*} value The value to convert.
+     * @returns {number} Returns the converted integer.
+     * @example
+     *
+     * _.toInteger(3.2);
+     * // => 3
+     *
+     * _.toInteger(Number.MIN_VALUE);
+     * // => 0
+     *
+     * _.toInteger(Infinity);
+     * // => 1.7976931348623157e+308
+     *
+     * _.toInteger('3.2');
+     * // => 3
+     */
+    function toInteger(value) {
+      var result = toFinite(value),
+          remainder = result % 1;
+
+      return result === result ? (remainder ? result - remainder : result) : 0;
+    }
+
+    /**
+     * Converts `value` to an integer suitable for use as the length of an
+     * array-like object.
+     *
+     * **Note:** This method is based on
+     * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Lang
+     * @param {*} value The value to convert.
+     * @returns {number} Returns the converted integer.
+     * @example
+     *
+     * _.toLength(3.2);
+     * // => 3
+     *
+     * _.toLength(Number.MIN_VALUE);
+     * // => 0
+     *
+     * _.toLength(Infinity);
+     * // => 4294967295
+     *
+     * _.toLength('3.2');
+     * // => 3
+     */
+    function toLength(value) {
+      return value ? baseClamp(toInteger(value), 0, MAX_ARRAY_LENGTH) : 0;
+    }
+
+    /**
+     * Converts `value` to a number.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Lang
+     * @param {*} value The value to process.
+     * @returns {number} Returns the number.
+     * @example
+     *
+     * _.toNumber(3.2);
+     * // => 3.2
+     *
+     * _.toNumber(Number.MIN_VALUE);
+     * // => 5e-324
+     *
+     * _.toNumber(Infinity);
+     * // => Infinity
+     *
+     * _.toNumber('3.2');
+     * // => 3.2
+     */
+    function toNumber(value) {
+      if (typeof value == 'number') {
+        return value;
+      }
+      if (isSymbol(value)) {
+        return NAN;
+      }
+      if (isObject(value)) {
+        var other = typeof value.valueOf == 'function' ? value.valueOf() : value;
+        value = isObject(other) ? (other + '') : other;
+      }
+      if (typeof value != 'string') {
+        return value === 0 ? value : +value;
+      }
+      value = value.replace(reTrim, '');
+      var isBinary = reIsBinary.test(value);
+      return (isBinary || reIsOctal.test(value))
+        ? freeParseInt(value.slice(2), isBinary ? 2 : 8)
+        : (reIsBadHex.test(value) ? NAN : +value);
+    }
+
+    /**
+     * Converts `value` to a plain object flattening inherited enumerable string
+     * keyed properties of `value` to own properties of the plain object.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category Lang
+     * @param {*} value The value to convert.
+     * @returns {Object} Returns the converted plain object.
+     * @example
+     *
+     * function Foo() {
+     *   this.b = 2;
+     * }
+     *
+     * Foo.prototype.c = 3;
+     *
+     * _.assign({ 'a': 1 }, new Foo);
+     * // => { 'a': 1, 'b': 2 }
+     *
+     * _.assign({ 'a': 1 }, _.toPlainObject(new Foo));
+     * // => { 'a': 1, 'b': 2, 'c': 3 }
+     */
+    function toPlainObject(value) {
+      return copyObject(value, keysIn(value));
+    }
+
+    /**
+     * Converts `value` to a safe integer. A safe integer can be compared and
+     * represented correctly.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Lang
+     * @param {*} value The value to convert.
+     * @returns {number} Returns the converted integer.
+     * @example
+     *
+     * _.toSafeInteger(3.2);
+     * // => 3
+     *
+     * _.toSafeInteger(Number.MIN_VALUE);
+     * // => 0
+     *
+     * _.toSafeInteger(Infinity);
+     * // => 9007199254740991
+     *
+     * _.toSafeInteger('3.2');
+     * // => 3
+     */
+    function toSafeInteger(value) {
+      return value
+        ? baseClamp(toInteger(value), -MAX_SAFE_INTEGER, MAX_SAFE_INTEGER)
+        : (value === 0 ? value : 0);
+    }
+
+    /**
+     * Converts `value` to a string. An empty string is returned for `null`
+     * and `undefined` values. The sign of `-0` is preserved.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Lang
+     * @param {*} value The value to convert.
+     * @returns {string} Returns the converted string.
+     * @example
+     *
+     * _.toString(null);
+     * // => ''
+     *
+     * _.toString(-0);
+     * // => '-0'
+     *
+     * _.toString([1, 2, 3]);
+     * // => '1,2,3'
+     */
+    function toString(value) {
+      return value == null ? '' : baseToString(value);
+    }
+
+    /*------------------------------------------------------------------------*/
+
+    /**
+     * Assigns own enumerable string keyed properties of source objects to the
+     * destination object. Source objects are applied from left to right.
+     * Subsequent sources overwrite property assignments of previous sources.
+     *
+     * **Note:** This method mutates `object` and is loosely based on
+     * [`Object.assign`](https://mdn.io/Object/assign).
+     *
+     * @static
+     * @memberOf _
+     * @since 0.10.0
+     * @category Object
+     * @param {Object} object The destination object.
+     * @param {...Object} [sources] The source objects.
+     * @returns {Object} Returns `object`.
+     * @see _.assignIn
+     * @example
+     *
+     * function Foo() {
+     *   this.a = 1;
+     * }
+     *
+     * function Bar() {
+     *   this.c = 3;
+     * }
+     *
+     * Foo.prototype.b = 2;
+     * Bar.prototype.d = 4;
+     *
+     * _.assign({ 'a': 0 }, new Foo, new Bar);
+     * // => { 'a': 1, 'c': 3 }
+     */
+    var assign = createAssigner(function(object, source) {
+      if (isPrototype(source) || isArrayLike(source)) {
+        copyObject(source, keys(source), object);
+        return;
+      }
+      for (var key in source) {
+        if (hasOwnProperty.call(source, key)) {
+          assignValue(object, key, source[key]);
+        }
+      }
+    });
+
+    /**
+     * This method is like `_.assign` except that it iterates over own and
+     * inherited source properties.
+     *
+     * **Note:** This method mutates `object`.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @alias extend
+     * @category Object
+     * @param {Object} object The destination object.
+     * @param {...Object} [sources] The source objects.
+     * @returns {Object} Returns `object`.
+     * @see _.assign
+     * @example
+     *
+     * function Foo() {
+     *   this.a = 1;
+     * }
+     *
+     * function Bar() {
+     *   this.c = 3;
+     * }
+     *
+     * Foo.prototype.b = 2;
+     * Bar.prototype.d = 4;
+     *
+     * _.assignIn({ 'a': 0 }, new Foo, new Bar);
+     * // => { 'a': 1, 'b': 2, 'c': 3, 'd': 4 }
+     */
+    var assignIn = createAssigner(function(object, source) {
+      copyObject(source, keysIn(source), object);
+    });
+
+    /**
+     * This method is like `_.assignIn` except that it accepts `customizer`
+     * which is invoked to produce the assigned values. If `customizer` returns
+     * `undefined`, assignment is handled by the method instead. The `customizer`
+     * is invoked with five arguments: (objValue, srcValue, key, object, source).
+     *
+     * **Note:** This method mutates `object`.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @alias extendWith
+     * @category Object
+     * @param {Object} object The destination object.
+     * @param {...Object} sources The source objects.
+     * @param {Function} [customizer] The function to customize assigned values.
+     * @returns {Object} Returns `object`.
+     * @see _.assignWith
+     * @example
+     *
+     * function customizer(objValue, srcValue) {
+     *   return _.isUndefined(objValue) ? srcValue : objValue;
+     * }
+     *
+     * var defaults = _.partialRight(_.assignInWith, customizer);
+     *
+     * defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
+     * // => { 'a': 1, 'b': 2 }
+     */
+    var assignInWith = createAssigner(function(object, source, srcIndex, customizer) {
+      copyObject(source, keysIn(source), object, customizer);
+    });
+
+    /**
+     * This method is like `_.assign` except that it accepts `customizer`
+     * which is invoked to produce the assigned values. If `customizer` returns
+     * `undefined`, assignment is handled by the method instead. The `customizer`
+     * is invoked with five arguments: (objValue, srcValue, key, object, source).
+     *
+     * **Note:** This method mutates `object`.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Object
+     * @param {Object} object The destination object.
+     * @param {...Object} sources The source objects.
+     * @param {Function} [customizer] The function to customize assigned values.
+     * @returns {Object} Returns `object`.
+     * @see _.assignInWith
+     * @example
+     *
+     * function customizer(objValue, srcValue) {
+     *   return _.isUndefined(objValue) ? srcValue : objValue;
+     * }
+     *
+     * var defaults = _.partialRight(_.assignWith, customizer);
+     *
+     * defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
+     * // => { 'a': 1, 'b': 2 }
+     */
+    var assignWith = createAssigner(function(object, source, srcIndex, customizer) {
+      copyObject(source, keys(source), object, customizer);
+    });
+
+    /**
+     * Creates an array of values corresponding to `paths` of `object`.
+     *
+     * @static
+     * @memberOf _
+     * @since 1.0.0
+     * @category Object
+     * @param {Object} object The object to iterate over.
+     * @param {...(string|string[])} [paths] The property paths to pick.
+     * @returns {Array} Returns the picked values.
+     * @example
+     *
+     * var object = { 'a': [{ 'b': { 'c': 3 } }, 4] };
+     *
+     * _.at(object, ['a[0].b.c', 'a[1]']);
+     * // => [3, 4]
+     */
+    var at = flatRest(baseAt);
+
+    /**
+     * Creates an object that inherits from the `prototype` object. If a
+     * `properties` object is given, its own enumerable string keyed properties
+     * are assigned to the created object.
+     *
+     * @static
+     * @memberOf _
+     * @since 2.3.0
+     * @category Object
+     * @param {Object} prototype The object to inherit from.
+     * @param {Object} [properties] The properties to assign to the object.
+     * @returns {Object} Returns the new object.
+     * @example
+     *
+     * function Shape() {
+     *   this.x = 0;
+     *   this.y = 0;
+     * }
+     *
+     * function Circle() {
+     *   Shape.call(this);
+     * }
+     *
+     * Circle.prototype = _.create(Shape.prototype, {
+     *   'constructor': Circle
+     * });
+     *
+     * var circle = new Circle;
+     * circle instanceof Circle;
+     * // => true
+     *
+     * circle instanceof Shape;
+     * // => true
+     */
+    function create(prototype, properties) {
+      var result = baseCreate(prototype);
+      return properties == null ? result : baseAssign(result, properties);
+    }
+
+    /**
+     * Assigns own and inherited enumerable string keyed properties of source
+     * objects to the destination object for all destination properties that
+     * resolve to `undefined`. Source objects are applied from left to right.
+     * Once a property is set, additional values of the same property are ignored.
+     *
+     * **Note:** This method mutates `object`.
+     *
+     * @static
+     * @since 0.1.0
+     * @memberOf _
+     * @category Object
+     * @param {Object} object The destination object.
+     * @param {...Object} [sources] The source objects.
+     * @returns {Object} Returns `object`.
+     * @see _.defaultsDeep
+     * @example
+     *
+     * _.defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
+     * // => { 'a': 1, 'b': 2 }
+     */
+    var defaults = baseRest(function(object, sources) {
+      object = Object(object);
+
+      var index = -1;
+      var length = sources.length;
+      var guard = length > 2 ? sources[2] : undefined;
+
+      if (guard && isIterateeCall(sources[0], sources[1], guard)) {
+        length = 1;
+      }
+
+      while (++index < length) {
+        var source = sources[index];
+        var props = keysIn(source);
+        var propsIndex = -1;
+        var propsLength = props.length;
+
+        while (++propsIndex < propsLength) {
+          var key = props[propsIndex];
+          var value = object[key];
+
+          if (value === undefined ||
+              (eq(value, objectProto[key]) && !hasOwnProperty.call(object, key))) {
+            object[key] = source[key];
+          }
+        }
+      }
+
+      return object;
+    });
+
+    /**
+     * This method is like `_.defaults` except that it recursively assigns
+     * default properties.
+     *
+     * **Note:** This method mutates `object`.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.10.0
+     * @category Object
+     * @param {Object} object The destination object.
+     * @param {...Object} [sources] The source objects.
+     * @returns {Object} Returns `object`.
+     * @see _.defaults
+     * @example
+     *
+     * _.defaultsDeep({ 'a': { 'b': 2 } }, { 'a': { 'b': 1, 'c': 3 } });
+     * // => { 'a': { 'b': 2, 'c': 3 } }
+     */
+    var defaultsDeep = baseRest(function(args) {
+      args.push(undefined, customDefaultsMerge);
+      return apply(mergeWith, undefined, args);
+    });
+
+    /**
+     * This method is like `_.find` except that it returns the key of the first
+     * element `predicate` returns truthy for instead of the element itself.
+     *
+     * @static
+     * @memberOf _
+     * @since 1.1.0
+     * @category Object
+     * @param {Object} object The object to inspect.
+     * @param {Function} [predicate=_.identity] The function invoked per iteration.
+     * @returns {string|undefined} Returns the key of the matched element,
+     *  else `undefined`.
+     * @example
+     *
+     * var users = {
+     *   'barney':  { 'age': 36, 'active': true },
+     *   'fred':    { 'age': 40, 'active': false },
+     *   'pebbles': { 'age': 1,  'active': true }
+     * };
+     *
+     * _.findKey(users, function(o) { return o.age < 40; });
+     * // => 'barney' (iteration order is not guaranteed)
+     *
+     * // The `_.matches` iteratee shorthand.
+     * _.findKey(users, { 'age': 1, 'active': true });
+     * // => 'pebbles'
+     *
+     * // The `_.matchesProperty` iteratee shorthand.
+     * _.findKey(users, ['active', false]);
+     * // => 'fred'
+     *
+     * // The `_.property` iteratee shorthand.
+     * _.findKey(users, 'active');
+     * // => 'barney'
+     */
+    function findKey(object, predicate) {
+      return baseFindKey(object, getIteratee(predicate, 3), baseForOwn);
+    }
+
+    /**
+     * This method is like `_.findKey` except that it iterates over elements of
+     * a collection in the opposite order.
+     *
+     * @static
+     * @memberOf _
+     * @since 2.0.0
+     * @category Object
+     * @param {Object} object The object to inspect.
+     * @param {Function} [predicate=_.identity] The function invoked per iteration.
+     * @returns {string|undefined} Returns the key of the matched element,
+     *  else `undefined`.
+     * @example
+     *
+     * var users = {
+     *   'barney':  { 'age': 36, 'active': true },
+     *   'fred':    { 'age': 40, 'active': false },
+     *   'pebbles': { 'age': 1,  'active': true }
+     * };
+     *
+     * _.findLastKey(users, function(o) { return o.age < 40; });
+     * // => returns 'pebbles' assuming `_.findKey` returns 'barney'
+     *
+     * // The `_.matches` iteratee shorthand.
+     * _.findLastKey(users, { 'age': 36, 'active': true });
+     * // => 'barney'
+     *
+     * // The `_.matchesProperty` iteratee shorthand.
+     * _.findLastKey(users, ['active', false]);
+     * // => 'fred'
+     *
+     * // The `_.property` iteratee shorthand.
+     * _.findLastKey(users, 'active');
+     * // => 'pebbles'
+     */
+    function findLastKey(object, predicate) {
+      return baseFindKey(object, getIteratee(predicate, 3), baseForOwnRight);
+    }
+
+    /**
+     * Iterates over own and inherited enumerable string keyed properties of an
+     * object and invokes `iteratee` for each property. The iteratee is invoked
+     * with three arguments: (value, key, object). Iteratee functions may exit
+     * iteration early by explicitly returning `false`.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.3.0
+     * @category Object
+     * @param {Object} object The object to iterate over.
+     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+     * @returns {Object} Returns `object`.
+     * @see _.forInRight
+     * @example
+     *
+     * function Foo() {
+     *   this.a = 1;
+     *   this.b = 2;
+     * }
+     *
+     * Foo.prototype.c = 3;
+     *
+     * _.forIn(new Foo, function(value, key) {
+     *   console.log(key);
+     * });
+     * // => Logs 'a', 'b', then 'c' (iteration order is not guaranteed).
+     */
+    function forIn(object, iteratee) {
+      return object == null
+        ? object
+        : baseFor(object, getIteratee(iteratee, 3), keysIn);
+    }
+
+    /**
+     * This method is like `_.forIn` except that it iterates over properties of
+     * `object` in the opposite order.
+     *
+     * @static
+     * @memberOf _
+     * @since 2.0.0
+     * @category Object
+     * @param {Object} object The object to iterate over.
+     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+     * @returns {Object} Returns `object`.
+     * @see _.forIn
+     * @example
+     *
+     * function Foo() {
+     *   this.a = 1;
+     *   this.b = 2;
+     * }
+     *
+     * Foo.prototype.c = 3;
+     *
+     * _.forInRight(new Foo, function(value, key) {
+     *   console.log(key);
+     * });
+     * // => Logs 'c', 'b', then 'a' assuming `_.forIn` logs 'a', 'b', then 'c'.
+     */
+    function forInRight(object, iteratee) {
+      return object == null
+        ? object
+        : baseForRight(object, getIteratee(iteratee, 3), keysIn);
+    }
+
+    /**
+     * Iterates over own enumerable string keyed properties of an object and
+     * invokes `iteratee` for each property. The iteratee is invoked with three
+     * arguments: (value, key, object). Iteratee functions may exit iteration
+     * early by explicitly returning `false`.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.3.0
+     * @category Object
+     * @param {Object} object The object to iterate over.
+     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+     * @returns {Object} Returns `object`.
+     * @see _.forOwnRight
+     * @example
+     *
+     * function Foo() {
+     *   this.a = 1;
+     *   this.b = 2;
+     * }
+     *
+     * Foo.prototype.c = 3;
+     *
+     * _.forOwn(new Foo, function(value, key) {
+     *   console.log(key);
+     * });
+     * // => Logs 'a' then 'b' (iteration order is not guaranteed).
+     */
+    function forOwn(object, iteratee) {
+      return object && baseForOwn(object, getIteratee(iteratee, 3));
+    }
+
+    /**
+     * This method is like `_.forOwn` except that it iterates over properties of
+     * `object` in the opposite order.
+     *
+     * @static
+     * @memberOf _
+     * @since 2.0.0
+     * @category Object
+     * @param {Object} object The object to iterate over.
+     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+     * @returns {Object} Returns `object`.
+     * @see _.forOwn
+     * @example
+     *
+     * function Foo() {
+     *   this.a = 1;
+     *   this.b = 2;
+     * }
+     *
+     * Foo.prototype.c = 3;
+     *
+     * _.forOwnRight(new Foo, function(value, key) {
+     *   console.log(key);
+     * });
+     * // => Logs 'b' then 'a' assuming `_.forOwn` logs 'a' then 'b'.
+     */
+    function forOwnRight(object, iteratee) {
+      return object && baseForOwnRight(object, getIteratee(iteratee, 3));
+    }
+
+    /**
+     * Creates an array of function property names from own enumerable properties
+     * of `object`.
+     *
+     * @static
+     * @since 0.1.0
+     * @memberOf _
+     * @category Object
+     * @param {Object} object The object to inspect.
+     * @returns {Array} Returns the function names.
+     * @see _.functionsIn
+     * @example
+     *
+     * function Foo() {
+     *   this.a = _.constant('a');
+     *   this.b = _.constant('b');
+     * }
+     *
+     * Foo.prototype.c = _.constant('c');
+     *
+     * _.functions(new Foo);
+     * // => ['a', 'b']
+     */
+    function functions(object) {
+      return object == null ? [] : baseFunctions(object, keys(object));
+    }
+
+    /**
+     * Creates an array of function property names from own and inherited
+     * enumerable properties of `object`.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Object
+     * @param {Object} object The object to inspect.
+     * @returns {Array} Returns the function names.
+     * @see _.functions
+     * @example
+     *
+     * function Foo() {
+     *   this.a = _.constant('a');
+     *   this.b = _.constant('b');
+     * }
+     *
+     * Foo.prototype.c = _.constant('c');
+     *
+     * _.functionsIn(new Foo);
+     * // => ['a', 'b', 'c']
+     */
+    function functionsIn(object) {
+      return object == null ? [] : baseFunctions(object, keysIn(object));
+    }
+
+    /**
+     * Gets the value at `path` of `object`. If the resolved value is
+     * `undefined`, the `defaultValue` is returned in its place.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.7.0
+     * @category Object
+     * @param {Object} object The object to query.
+     * @param {Array|string} path The path of the property to get.
+     * @param {*} [defaultValue] The value returned for `undefined` resolved values.
+     * @returns {*} Returns the resolved value.
+     * @example
+     *
+     * var object = { 'a': [{ 'b': { 'c': 3 } }] };
+     *
+     * _.get(object, 'a[0].b.c');
+     * // => 3
+     *
+     * _.get(object, ['a', '0', 'b', 'c']);
+     * // => 3
+     *
+     * _.get(object, 'a.b.c', 'default');
+     * // => 'default'
+     */
+    function get(object, path, defaultValue) {
+      var result = object == null ? undefined : baseGet(object, path);
+      return result === undefined ? defaultValue : result;
+    }
+
+    /**
+     * Checks if `path` is a direct property of `object`.
+     *
+     * @static
+     * @since 0.1.0
+     * @memberOf _
+     * @category Object
+     * @param {Object} object The object to query.
+     * @param {Array|string} path The path to check.
+     * @returns {boolean} Returns `true` if `path` exists, else `false`.
+     * @example
+     *
+     * var object = { 'a': { 'b': 2 } };
+     * var other = _.create({ 'a': _.create({ 'b': 2 }) });
+     *
+     * _.has(object, 'a');
+     * // => true
+     *
+     * _.has(object, 'a.b');
+     * // => true
+     *
+     * _.has(object, ['a', 'b']);
+     * // => true
+     *
+     * _.has(other, 'a');
+     * // => false
+     */
+    function has(object, path) {
+      return object != null && hasPath(object, path, baseHas);
+    }
+
+    /**
+     * Checks if `path` is a direct or inherited property of `object`.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Object
+     * @param {Object} object The object to query.
+     * @param {Array|string} path The path to check.
+     * @returns {boolean} Returns `true` if `path` exists, else `false`.
+     * @example
+     *
+     * var object = _.create({ 'a': _.create({ 'b': 2 }) });
+     *
+     * _.hasIn(object, 'a');
+     * // => true
+     *
+     * _.hasIn(object, 'a.b');
+     * // => true
+     *
+     * _.hasIn(object, ['a', 'b']);
+     * // => true
+     *
+     * _.hasIn(object, 'b');
+     * // => false
+     */
+    function hasIn(object, path) {
+      return object != null && hasPath(object, path, baseHasIn);
+    }
+
+    /**
+     * Creates an object composed of the inverted keys and values of `object`.
+     * If `object` contains duplicate values, subsequent values overwrite
+     * property assignments of previous values.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.7.0
+     * @category Object
+     * @param {Object} object The object to invert.
+     * @returns {Object} Returns the new inverted object.
+     * @example
+     *
+     * var object = { 'a': 1, 'b': 2, 'c': 1 };
+     *
+     * _.invert(object);
+     * // => { '1': 'c', '2': 'b' }
+     */
+    var invert = createInverter(function(result, value, key) {
+      if (value != null &&
+          typeof value.toString != 'function') {
+        value = nativeObjectToString.call(value);
+      }
+
+      result[value] = key;
+    }, constant(identity));
+
+    /**
+     * This method is like `_.invert` except that the inverted object is generated
+     * from the results of running each element of `object` thru `iteratee`. The
+     * corresponding inverted value of each inverted key is an array of keys
+     * responsible for generating the inverted value. The iteratee is invoked
+     * with one argument: (value).
+     *
+     * @static
+     * @memberOf _
+     * @since 4.1.0
+     * @category Object
+     * @param {Object} object The object to invert.
+     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
+     * @returns {Object} Returns the new inverted object.
+     * @example
+     *
+     * var object = { 'a': 1, 'b': 2, 'c': 1 };
+     *
+     * _.invertBy(object);
+     * // => { '1': ['a', 'c'], '2': ['b'] }
+     *
+     * _.invertBy(object, function(value) {
+     *   return 'group' + value;
+     * });
+     * // => { 'group1': ['a', 'c'], 'group2': ['b'] }
+     */
+    var invertBy = createInverter(function(result, value, key) {
+      if (value != null &&
+          typeof value.toString != 'function') {
+        value = nativeObjectToString.call(value);
+      }
+
+      if (hasOwnProperty.call(result, value)) {
+        result[value].push(key);
+      } else {
+        result[value] = [key];
+      }
+    }, getIteratee);
+
+    /**
+     * Invokes the method at `path` of `object`.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Object
+     * @param {Object} object The object to query.
+     * @param {Array|string} path The path of the method to invoke.
+     * @param {...*} [args] The arguments to invoke the method with.
+     * @returns {*} Returns the result of the invoked method.
+     * @example
+     *
+     * var object = { 'a': [{ 'b': { 'c': [1, 2, 3, 4] } }] };
+     *
+     * _.invoke(object, 'a[0].b.c.slice', 1, 3);
+     * // => [2, 3]
+     */
+    var invoke = baseRest(baseInvoke);
+
+    /**
+     * Creates an array of the own enumerable property names of `object`.
+     *
+     * **Note:** Non-object values are coerced to objects. See the
+     * [ES spec](http://ecma-international.org/ecma-262/7.0/#sec-object.keys)
+     * for more details.
+     *
+     * @static
+     * @since 0.1.0
+     * @memberOf _
+     * @category Object
+     * @param {Object} object The object to query.
+     * @returns {Array} Returns the array of property names.
+     * @example
+     *
+     * function Foo() {
+     *   this.a = 1;
+     *   this.b = 2;
+     * }
+     *
+     * Foo.prototype.c = 3;
+     *
+     * _.keys(new Foo);
+     * // => ['a', 'b'] (iteration order is not guaranteed)
+     *
+     * _.keys('hi');
+     * // => ['0', '1']
+     */
+    function keys(object) {
+      return isArrayLike(object) ? arrayLikeKeys(object) : baseKeys(object);
+    }
+
+    /**
+     * Creates an array of the own and inherited enumerable property names of `object`.
+     *
+     * **Note:** Non-object values are coerced to objects.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category Object
+     * @param {Object} object The object to query.
+     * @returns {Array} Returns the array of property names.
+     * @example
+     *
+     * function Foo() {
+     *   this.a = 1;
+     *   this.b = 2;
+     * }
+     *
+     * Foo.prototype.c = 3;
+     *
+     * _.keysIn(new Foo);
+     * // => ['a', 'b', 'c'] (iteration order is not guaranteed)
+     */
+    function keysIn(object) {
+      return isArrayLike(object) ? arrayLikeKeys(object, true) : baseKeysIn(object);
+    }
+
+    /**
+     * The opposite of `_.mapValues`; this method creates an object with the
+     * same values as `object` and keys generated by running each own enumerable
+     * string keyed property of `object` thru `iteratee`. The iteratee is invoked
+     * with three arguments: (value, key, object).
+     *
+     * @static
+     * @memberOf _
+     * @since 3.8.0
+     * @category Object
+     * @param {Object} object The object to iterate over.
+     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+     * @returns {Object} Returns the new mapped object.
+     * @see _.mapValues
+     * @example
+     *
+     * _.mapKeys({ 'a': 1, 'b': 2 }, function(value, key) {
+     *   return key + value;
+     * });
+     * // => { 'a1': 1, 'b2': 2 }
+     */
+    function mapKeys(object, iteratee) {
+      var result = {};
+      iteratee = getIteratee(iteratee, 3);
+
+      baseForOwn(object, function(value, key, object) {
+        baseAssignValue(result, iteratee(value, key, object), value);
+      });
+      return result;
+    }
+
+    /**
+     * Creates an object with the same keys as `object` and values generated
+     * by running each own enumerable string keyed property of `object` thru
+     * `iteratee`. The iteratee is invoked with three arguments:
+     * (value, key, object).
+     *
+     * @static
+     * @memberOf _
+     * @since 2.4.0
+     * @category Object
+     * @param {Object} object The object to iterate over.
+     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+     * @returns {Object} Returns the new mapped object.
+     * @see _.mapKeys
+     * @example
+     *
+     * var users = {
+     *   'fred':    { 'user': 'fred',    'age': 40 },
+     *   'pebbles': { 'user': 'pebbles', 'age': 1 }
+     * };
+     *
+     * _.mapValues(users, function(o) { return o.age; });
+     * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)
+     *
+     * // The `_.property` iteratee shorthand.
+     * _.mapValues(users, 'age');
+     * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)
+     */
+    function mapValues(object, iteratee) {
+      var result = {};
+      iteratee = getIteratee(iteratee, 3);
+
+      baseForOwn(object, function(value, key, object) {
+        baseAssignValue(result, key, iteratee(value, key, object));
+      });
+      return result;
+    }
+
+    /**
+     * This method is like `_.assign` except that it recursively merges own and
+     * inherited enumerable string keyed properties of source objects into the
+     * destination object. Source properties that resolve to `undefined` are
+     * skipped if a destination value exists. Array and plain object properties
+     * are merged recursively. Other objects and value types are overridden by
+     * assignment. Source objects are applied from left to right. Subsequent
+     * sources overwrite property assignments of previous sources.
+     *
+     * **Note:** This method mutates `object`.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.5.0
+     * @category Object
+     * @param {Object} object The destination object.
+     * @param {...Object} [sources] The source objects.
+     * @returns {Object} Returns `object`.
+     * @example
+     *
+     * var object = {
+     *   'a': [{ 'b': 2 }, { 'd': 4 }]
+     * };
+     *
+     * var other = {
+     *   'a': [{ 'c': 3 }, { 'e': 5 }]
+     * };
+     *
+     * _.merge(object, other);
+     * // => { 'a': [{ 'b': 2, 'c': 3 }, { 'd': 4, 'e': 5 }] }
+     */
+    var merge = createAssigner(function(object, source, srcIndex) {
+      baseMerge(object, source, srcIndex);
+    });
+
+    /**
+     * This method is like `_.merge` except that it accepts `customizer` which
+     * is invoked to produce the merged values of the destination and source
+     * properties. If `customizer` returns `undefined`, merging is handled by the
+     * method instead. The `customizer` is invoked with six arguments:
+     * (objValue, srcValue, key, object, source, stack).
+     *
+     * **Note:** This method mutates `object`.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Object
+     * @param {Object} object The destination object.
+     * @param {...Object} sources The source objects.
+     * @param {Function} customizer The function to customize assigned values.
+     * @returns {Object} Returns `object`.
+     * @example
+     *
+     * function customizer(objValue, srcValue) {
+     *   if (_.isArray(objValue)) {
+     *     return objValue.concat(srcValue);
+     *   }
+     * }
+     *
+     * var object = { 'a': [1], 'b': [2] };
+     * var other = { 'a': [3], 'b': [4] };
+     *
+     * _.mergeWith(object, other, customizer);
+     * // => { 'a': [1, 3], 'b': [2, 4] }
+     */
+    var mergeWith = createAssigner(function(object, source, srcIndex, customizer) {
+      baseMerge(object, source, srcIndex, customizer);
+    });
+
+    /**
+     * The opposite of `_.pick`; this method creates an object composed of the
+     * own and inherited enumerable property paths of `object` that are not omitted.
+     *
+     * **Note:** This method is considerably slower than `_.pick`.
+     *
+     * @static
+     * @since 0.1.0
+     * @memberOf _
+     * @category Object
+     * @param {Object} object The source object.
+     * @param {...(string|string[])} [paths] The property paths to omit.
+     * @returns {Object} Returns the new object.
+     * @example
+     *
+     * var object = { 'a': 1, 'b': '2', 'c': 3 };
+     *
+     * _.omit(object, ['a', 'c']);
+     * // => { 'b': '2' }
+     */
+    var omit = flatRest(function(object, paths) {
+      var result = {};
+      if (object == null) {
+        return result;
+      }
+      var isDeep = false;
+      paths = arrayMap(paths, function(path) {
+        path = castPath(path, object);
+        isDeep || (isDeep = path.length > 1);
+        return path;
+      });
+      copyObject(object, getAllKeysIn(object), result);
+      if (isDeep) {
+        result = baseClone(result, CLONE_DEEP_FLAG | CLONE_FLAT_FLAG | CLONE_SYMBOLS_FLAG, customOmitClone);
+      }
+      var length = paths.length;
+      while (length--) {
+        baseUnset(result, paths[length]);
+      }
+      return result;
+    });
+
+    /**
+     * The opposite of `_.pickBy`; this method creates an object composed of
+     * the own and inherited enumerable string keyed properties of `object` that
+     * `predicate` doesn't return truthy for. The predicate is invoked with two
+     * arguments: (value, key).
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Object
+     * @param {Object} object The source object.
+     * @param {Function} [predicate=_.identity] The function invoked per property.
+     * @returns {Object} Returns the new object.
+     * @example
+     *
+     * var object = { 'a': 1, 'b': '2', 'c': 3 };
+     *
+     * _.omitBy(object, _.isNumber);
+     * // => { 'b': '2' }
+     */
+    function omitBy(object, predicate) {
+      return pickBy(object, negate(getIteratee(predicate)));
+    }
+
+    /**
+     * Creates an object composed of the picked `object` properties.
+     *
+     * @static
+     * @since 0.1.0
+     * @memberOf _
+     * @category Object
+     * @param {Object} object The source object.
+     * @param {...(string|string[])} [paths] The property paths to pick.
+     * @returns {Object} Returns the new object.
+     * @example
+     *
+     * var object = { 'a': 1, 'b': '2', 'c': 3 };
+     *
+     * _.pick(object, ['a', 'c']);
+     * // => { 'a': 1, 'c': 3 }
+     */
+    var pick = flatRest(function(object, paths) {
+      return object == null ? {} : basePick(object, paths);
+    });
+
+    /**
+     * Creates an object composed of the `object` properties `predicate` returns
+     * truthy for. The predicate is invoked with two arguments: (value, key).
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Object
+     * @param {Object} object The source object.
+     * @param {Function} [predicate=_.identity] The function invoked per property.
+     * @returns {Object} Returns the new object.
+     * @example
+     *
+     * var object = { 'a': 1, 'b': '2', 'c': 3 };
+     *
+     * _.pickBy(object, _.isNumber);
+     * // => { 'a': 1, 'c': 3 }
+     */
+    function pickBy(object, predicate) {
+      if (object == null) {
+        return {};
+      }
+      var props = arrayMap(getAllKeysIn(object), function(prop) {
+        return [prop];
+      });
+      predicate = getIteratee(predicate);
+      return basePickBy(object, props, function(value, path) {
+        return predicate(value, path[0]);
+      });
+    }
+
+    /**
+     * This method is like `_.get` except that if the resolved value is a
+     * function it's invoked with the `this` binding of its parent object and
+     * its result is returned.
+     *
+     * @static
+     * @since 0.1.0
+     * @memberOf _
+     * @category Object
+     * @param {Object} object The object to query.
+     * @param {Array|string} path The path of the property to resolve.
+     * @param {*} [defaultValue] The value returned for `undefined` resolved values.
+     * @returns {*} Returns the resolved value.
+     * @example
+     *
+     * var object = { 'a': [{ 'b': { 'c1': 3, 'c2': _.constant(4) } }] };
+     *
+     * _.result(object, 'a[0].b.c1');
+     * // => 3
+     *
+     * _.result(object, 'a[0].b.c2');
+     * // => 4
+     *
+     * _.result(object, 'a[0].b.c3', 'default');
+     * // => 'default'
+     *
+     * _.result(object, 'a[0].b.c3', _.constant('default'));
+     * // => 'default'
+     */
+    function result(object, path, defaultValue) {
+      path = castPath(path, object);
+
+      var index = -1,
+          length = path.length;
+
+      // Ensure the loop is entered when path is empty.
+      if (!length) {
+        length = 1;
+        object = undefined;
+      }
+      while (++index < length) {
+        var value = object == null ? undefined : object[toKey(path[index])];
+        if (value === undefined) {
+          index = length;
+          value = defaultValue;
+        }
+        object = isFunction(value) ? value.call(object) : value;
+      }
+      return object;
+    }
+
+    /**
+     * Sets the value at `path` of `object`. If a portion of `path` doesn't exist,
+     * it's created. Arrays are created for missing index properties while objects
+     * are created for all other missing properties. Use `_.setWith` to customize
+     * `path` creation.
+     *
+     * **Note:** This method mutates `object`.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.7.0
+     * @category Object
+     * @param {Object} object The object to modify.
+     * @param {Array|string} path The path of the property to set.
+     * @param {*} value The value to set.
+     * @returns {Object} Returns `object`.
+     * @example
+     *
+     * var object = { 'a': [{ 'b': { 'c': 3 } }] };
+     *
+     * _.set(object, 'a[0].b.c', 4);
+     * console.log(object.a[0].b.c);
+     * // => 4
+     *
+     * _.set(object, ['x', '0', 'y', 'z'], 5);
+     * console.log(object.x[0].y.z);
+     * // => 5
+     */
+    function set(object, path, value) {
+      return object == null ? object : baseSet(object, path, value);
+    }
+
+    /**
+     * This method is like `_.set` except that it accepts `customizer` which is
+     * invoked to produce the objects of `path`.  If `customizer` returns `undefined`
+     * path creation is handled by the method instead. The `customizer` is invoked
+     * with three arguments: (nsValue, key, nsObject).
+     *
+     * **Note:** This method mutates `object`.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Object
+     * @param {Object} object The object to modify.
+     * @param {Array|string} path The path of the property to set.
+     * @param {*} value The value to set.
+     * @param {Function} [customizer] The function to customize assigned values.
+     * @returns {Object} Returns `object`.
+     * @example
+     *
+     * var object = {};
+     *
+     * _.setWith(object, '[0][1]', 'a', Object);
+     * // => { '0': { '1': 'a' } }
+     */
+    function setWith(object, path, value, customizer) {
+      customizer = typeof customizer == 'function' ? customizer : undefined;
+      return object == null ? object : baseSet(object, path, value, customizer);
+    }
+
+    /**
+     * Creates an array of own enumerable string keyed-value pairs for `object`
+     * which can be consumed by `_.fromPairs`. If `object` is a map or set, its
+     * entries are returned.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @alias entries
+     * @category Object
+     * @param {Object} object The object to query.
+     * @returns {Array} Returns the key-value pairs.
+     * @example
+     *
+     * function Foo() {
+     *   this.a = 1;
+     *   this.b = 2;
+     * }
+     *
+     * Foo.prototype.c = 3;
+     *
+     * _.toPairs(new Foo);
+     * // => [['a', 1], ['b', 2]] (iteration order is not guaranteed)
+     */
+    var toPairs = createToPairs(keys);
+
+    /**
+     * Creates an array of own and inherited enumerable string keyed-value pairs
+     * for `object` which can be consumed by `_.fromPairs`. If `object` is a map
+     * or set, its entries are returned.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @alias entriesIn
+     * @category Object
+     * @param {Object} object The object to query.
+     * @returns {Array} Returns the key-value pairs.
+     * @example
+     *
+     * function Foo() {
+     *   this.a = 1;
+     *   this.b = 2;
+     * }
+     *
+     * Foo.prototype.c = 3;
+     *
+     * _.toPairsIn(new Foo);
+     * // => [['a', 1], ['b', 2], ['c', 3]] (iteration order is not guaranteed)
+     */
+    var toPairsIn = createToPairs(keysIn);
+
+    /**
+     * An alternative to `_.reduce`; this method transforms `object` to a new
+     * `accumulator` object which is the result of running each of its own
+     * enumerable string keyed properties thru `iteratee`, with each invocation
+     * potentially mutating the `accumulator` object. If `accumulator` is not
+     * provided, a new object with the same `[[Prototype]]` will be used. The
+     * iteratee is invoked with four arguments: (accumulator, value, key, object).
+     * Iteratee functions may exit iteration early by explicitly returning `false`.
+     *
+     * @static
+     * @memberOf _
+     * @since 1.3.0
+     * @category Object
+     * @param {Object} object The object to iterate over.
+     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+     * @param {*} [accumulator] The custom accumulator value.
+     * @returns {*} Returns the accumulated value.
+     * @example
+     *
+     * _.transform([2, 3, 4], function(result, n) {
+     *   result.push(n *= n);
+     *   return n % 2 == 0;
+     * }, []);
+     * // => [4, 9]
+     *
+     * _.transform({ 'a': 1, 'b': 2, 'c': 1 }, function(result, value, key) {
+     *   (result[value] || (result[value] = [])).push(key);
+     * }, {});
+     * // => { '1': ['a', 'c'], '2': ['b'] }
+     */
+    function transform(object, iteratee, accumulator) {
+      var isArr = isArray(object),
+          isArrLike = isArr || isBuffer(object) || isTypedArray(object);
+
+      iteratee = getIteratee(iteratee, 4);
+      if (accumulator == null) {
+        var Ctor = object && object.constructor;
+        if (isArrLike) {
+          accumulator = isArr ? new Ctor : [];
+        }
+        else if (isObject(object)) {
+          accumulator = isFunction(Ctor) ? baseCreate(getPrototype(object)) : {};
+        }
+        else {
+          accumulator = {};
+        }
+      }
+      (isArrLike ? arrayEach : baseForOwn)(object, function(value, index, object) {
+        return iteratee(accumulator, value, index, object);
+      });
+      return accumulator;
+    }
+
+    /**
+     * Removes the property at `path` of `object`.
+     *
+     * **Note:** This method mutates `object`.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Object
+     * @param {Object} object The object to modify.
+     * @param {Array|string} path The path of the property to unset.
+     * @returns {boolean} Returns `true` if the property is deleted, else `false`.
+     * @example
+     *
+     * var object = { 'a': [{ 'b': { 'c': 7 } }] };
+     * _.unset(object, 'a[0].b.c');
+     * // => true
+     *
+     * console.log(object);
+     * // => { 'a': [{ 'b': {} }] };
+     *
+     * _.unset(object, ['a', '0', 'b', 'c']);
+     * // => true
+     *
+     * console.log(object);
+     * // => { 'a': [{ 'b': {} }] };
+     */
+    function unset(object, path) {
+      return object == null ? true : baseUnset(object, path);
+    }
+
+    /**
+     * This method is like `_.set` except that accepts `updater` to produce the
+     * value to set. Use `_.updateWith` to customize `path` creation. The `updater`
+     * is invoked with one argument: (value).
+     *
+     * **Note:** This method mutates `object`.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.6.0
+     * @category Object
+     * @param {Object} object The object to modify.
+     * @param {Array|string} path The path of the property to set.
+     * @param {Function} updater The function to produce the updated value.
+     * @returns {Object} Returns `object`.
+     * @example
+     *
+     * var object = { 'a': [{ 'b': { 'c': 3 } }] };
+     *
+     * _.update(object, 'a[0].b.c', function(n) { return n * n; });
+     * console.log(object.a[0].b.c);
+     * // => 9
+     *
+     * _.update(object, 'x[0].y.z', function(n) { return n ? n + 1 : 0; });
+     * console.log(object.x[0].y.z);
+     * // => 0
+     */
+    function update(object, path, updater) {
+      return object == null ? object : baseUpdate(object, path, castFunction(updater));
+    }
+
+    /**
+     * This method is like `_.update` except that it accepts `customizer` which is
+     * invoked to produce the objects of `path`.  If `customizer` returns `undefined`
+     * path creation is handled by the method instead. The `customizer` is invoked
+     * with three arguments: (nsValue, key, nsObject).
+     *
+     * **Note:** This method mutates `object`.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.6.0
+     * @category Object
+     * @param {Object} object The object to modify.
+     * @param {Array|string} path The path of the property to set.
+     * @param {Function} updater The function to produce the updated value.
+     * @param {Function} [customizer] The function to customize assigned values.
+     * @returns {Object} Returns `object`.
+     * @example
+     *
+     * var object = {};
+     *
+     * _.updateWith(object, '[0][1]', _.constant('a'), Object);
+     * // => { '0': { '1': 'a' } }
+     */
+    function updateWith(object, path, updater, customizer) {
+      customizer = typeof customizer == 'function' ? customizer : undefined;
+      return object == null ? object : baseUpdate(object, path, castFunction(updater), customizer);
+    }
+
+    /**
+     * Creates an array of the own enumerable string keyed property values of `object`.
+     *
+     * **Note:** Non-object values are coerced to objects.
+     *
+     * @static
+     * @since 0.1.0
+     * @memberOf _
+     * @category Object
+     * @param {Object} object The object to query.
+     * @returns {Array} Returns the array of property values.
+     * @example
+     *
+     * function Foo() {
+     *   this.a = 1;
+     *   this.b = 2;
+     * }
+     *
+     * Foo.prototype.c = 3;
+     *
+     * _.values(new Foo);
+     * // => [1, 2] (iteration order is not guaranteed)
+     *
+     * _.values('hi');
+     * // => ['h', 'i']
+     */
+    function values(object) {
+      return object == null ? [] : baseValues(object, keys(object));
+    }
+
+    /**
+     * Creates an array of the own and inherited enumerable string keyed property
+     * values of `object`.
+     *
+     * **Note:** Non-object values are coerced to objects.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category Object
+     * @param {Object} object The object to query.
+     * @returns {Array} Returns the array of property values.
+     * @example
+     *
+     * function Foo() {
+     *   this.a = 1;
+     *   this.b = 2;
+     * }
+     *
+     * Foo.prototype.c = 3;
+     *
+     * _.valuesIn(new Foo);
+     * // => [1, 2, 3] (iteration order is not guaranteed)
+     */
+    function valuesIn(object) {
+      return object == null ? [] : baseValues(object, keysIn(object));
+    }
+
+    /*------------------------------------------------------------------------*/
+
+    /**
+     * Clamps `number` within the inclusive `lower` and `upper` bounds.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Number
+     * @param {number} number The number to clamp.
+     * @param {number} [lower] The lower bound.
+     * @param {number} upper The upper bound.
+     * @returns {number} Returns the clamped number.
+     * @example
+     *
+     * _.clamp(-10, -5, 5);
+     * // => -5
+     *
+     * _.clamp(10, -5, 5);
+     * // => 5
+     */
+    function clamp(number, lower, upper) {
+      if (upper === undefined) {
+        upper = lower;
+        lower = undefined;
+      }
+      if (upper !== undefined) {
+        upper = toNumber(upper);
+        upper = upper === upper ? upper : 0;
+      }
+      if (lower !== undefined) {
+        lower = toNumber(lower);
+        lower = lower === lower ? lower : 0;
+      }
+      return baseClamp(toNumber(number), lower, upper);
+    }
+
+    /**
+     * Checks if `n` is between `start` and up to, but not including, `end`. If
+     * `end` is not specified, it's set to `start` with `start` then set to `0`.
+     * If `start` is greater than `end` the params are swapped to support
+     * negative ranges.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.3.0
+     * @category Number
+     * @param {number} number The number to check.
+     * @param {number} [start=0] The start of the range.
+     * @param {number} end The end of the range.
+     * @returns {boolean} Returns `true` if `number` is in the range, else `false`.
+     * @see _.range, _.rangeRight
+     * @example
+     *
+     * _.inRange(3, 2, 4);
+     * // => true
+     *
+     * _.inRange(4, 8);
+     * // => true
+     *
+     * _.inRange(4, 2);
+     * // => false
+     *
+     * _.inRange(2, 2);
+     * // => false
+     *
+     * _.inRange(1.2, 2);
+     * // => true
+     *
+     * _.inRange(5.2, 4);
+     * // => false
+     *
+     * _.inRange(-3, -2, -6);
+     * // => true
+     */
+    function inRange(number, start, end) {
+      start = toFinite(start);
+      if (end === undefined) {
+        end = start;
+        start = 0;
+      } else {
+        end = toFinite(end);
+      }
+      number = toNumber(number);
+      return baseInRange(number, start, end);
+    }
+
+    /**
+     * Produces a random number between the inclusive `lower` and `upper` bounds.
+     * If only one argument is provided a number between `0` and the given number
+     * is returned. If `floating` is `true`, or either `lower` or `upper` are
+     * floats, a floating-point number is returned instead of an integer.
+     *
+     * **Note:** JavaScript follows the IEEE-754 standard for resolving
+     * floating-point values which can produce unexpected results.
+     *
+     * @static
+     * @memberOf _
+     * @since 0.7.0
+     * @category Number
+     * @param {number} [lower=0] The lower bound.
+     * @param {number} [upper=1] The upper bound.
+     * @param {boolean} [floating] Specify returning a floating-point number.
+     * @returns {number} Returns the random number.
+     * @example
+     *
+     * _.random(0, 5);
+     * // => an integer between 0 and 5
+     *
+     * _.random(5);
+     * // => also an integer between 0 and 5
+     *
+     * _.random(5, true);
+     * // => a floating-point number between 0 and 5
+     *
+     * _.random(1.2, 5.2);
+     * // => a floating-point number between 1.2 and 5.2
+     */
+    function random(lower, upper, floating) {
+      if (floating && typeof floating != 'boolean' && isIterateeCall(lower, upper, floating)) {
+        upper = floating = undefined;
+      }
+      if (floating === undefined) {
+        if (typeof upper == 'boolean') {
+          floating = upper;
+          upper = undefined;
+        }
+        else if (typeof lower == 'boolean') {
+          floating = lower;
+          lower = undefined;
+        }
+      }
+      if (lower === undefined && upper === undefined) {
+        lower = 0;
+        upper = 1;
+      }
+      else {
+        lower = toFinite(lower);
+        if (upper === undefined) {
+          upper = lower;
+          lower = 0;
+        } else {
+          upper = toFinite(upper);
+        }
+      }
+      if (lower > upper) {
+        var temp = lower;
+        lower = upper;
+        upper = temp;
+      }
+      if (floating || lower % 1 || upper % 1) {
+        var rand = nativeRandom();
+        return nativeMin(lower + (rand * (upper - lower + freeParseFloat('1e-' + ((rand + '').length - 1)))), upper);
+      }
+      return baseRandom(lower, upper);
+    }
+
+    /*------------------------------------------------------------------------*/
+
+    /**
+     * Converts `string` to [camel case](https://en.wikipedia.org/wiki/CamelCase).
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category String
+     * @param {string} [string=''] The string to convert.
+     * @returns {string} Returns the camel cased string.
+     * @example
+     *
+     * _.camelCase('Foo Bar');
+     * // => 'fooBar'
+     *
+     * _.camelCase('--foo-bar--');
+     * // => 'fooBar'
+     *
+     * _.camelCase('__FOO_BAR__');
+     * // => 'fooBar'
+     */
+    var camelCase = createCompounder(function(result, word, index) {
+      word = word.toLowerCase();
+      return result + (index ? capitalize(word) : word);
+    });
+
+    /**
+     * Converts the first character of `string` to upper case and the remaining
+     * to lower case.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category String
+     * @param {string} [string=''] The string to capitalize.
+     * @returns {string} Returns the capitalized string.
+     * @example
+     *
+     * _.capitalize('FRED');
+     * // => 'Fred'
+     */
+    function capitalize(string) {
+      return upperFirst(toString(string).toLowerCase());
+    }
+
+    /**
+     * Deburrs `string` by converting
+     * [Latin-1 Supplement](https://en.wikipedia.org/wiki/Latin-1_Supplement_(Unicode_block)#Character_table)
+     * and [Latin Extended-A](https://en.wikipedia.org/wiki/Latin_Extended-A)
+     * letters to basic Latin letters and removing
+     * [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks).
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category String
+     * @param {string} [string=''] The string to deburr.
+     * @returns {string} Returns the deburred string.
+     * @example
+     *
+     * _.deburr('déjà vu');
+     * // => 'deja vu'
+     */
+    function deburr(string) {
+      string = toString(string);
+      return string && string.replace(reLatin, deburrLetter).replace(reComboMark, '');
+    }
+
+    /**
+     * Checks if `string` ends with the given target string.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category String
+     * @param {string} [string=''] The string to inspect.
+     * @param {string} [target] The string to search for.
+     * @param {number} [position=string.length] The position to search up to.
+     * @returns {boolean} Returns `true` if `string` ends with `target`,
+     *  else `false`.
+     * @example
+     *
+     * _.endsWith('abc', 'c');
+     * // => true
+     *
+     * _.endsWith('abc', 'b');
+     * // => false
+     *
+     * _.endsWith('abc', 'b', 2);
+     * // => true
+     */
+    function endsWith(string, target, position) {
+      string = toString(string);
+      target = baseToString(target);
+
+      var length = string.length;
+      position = position === undefined
+        ? length
+        : baseClamp(toInteger(position), 0, length);
+
+      var end = position;
+      position -= target.length;
+      return position >= 0 && string.slice(position, end) == target;
+    }
+
+    /**
+     * Converts the characters "&", "<", ">", '"', and "'" in `string` to their
+     * corresponding HTML entities.
+     *
+     * **Note:** No other characters are escaped. To escape additional
+     * characters use a third-party library like [_he_](https://mths.be/he).
+     *
+     * Though the ">" character is escaped for symmetry, characters like
+     * ">" and "/" don't need escaping in HTML and have no special meaning
+     * unless they're part of a tag or unquoted attribute value. See
+     * [Mathias Bynens's article](https://mathiasbynens.be/notes/ambiguous-ampersands)
+     * (under "semi-related fun fact") for more details.
+     *
+     * When working with HTML you should always
+     * [quote attribute values](http://wonko.com/post/html-escaping) to reduce
+     * XSS vectors.
+     *
+     * @static
+     * @since 0.1.0
+     * @memberOf _
+     * @category String
+     * @param {string} [string=''] The string to escape.
+     * @returns {string} Returns the escaped string.
+     * @example
+     *
+     * _.escape('fred, barney, & pebbles');
+     * // => 'fred, barney, &amp; pebbles'
+     */
+    function escape(string) {
+      string = toString(string);
+      return (string && reHasUnescapedHtml.test(string))
+        ? string.replace(reUnescapedHtml, escapeHtmlChar)
+        : string;
+    }
+
+    /**
+     * Escapes the `RegExp` special characters "^", "$", "\", ".", "*", "+",
+     * "?", "(", ")", "[", "]", "{", "}", and "|" in `string`.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category String
+     * @param {string} [string=''] The string to escape.
+     * @returns {string} Returns the escaped string.
+     * @example
+     *
+     * _.escapeRegExp('[lodash](https://lodash.com/)');
+     * // => '\[lodash\]\(https://lodash\.com/\)'
+     */
+    function escapeRegExp(string) {
+      string = toString(string);
+      return (string && reHasRegExpChar.test(string))
+        ? string.replace(reRegExpChar, '\\$&')
+        : string;
+    }
+
+    /**
+     * Converts `string` to
+     * [kebab case](https://en.wikipedia.org/wiki/Letter_case#Special_case_styles).
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category String
+     * @param {string} [string=''] The string to convert.
+     * @returns {string} Returns the kebab cased string.
+     * @example
+     *
+     * _.kebabCase('Foo Bar');
+     * // => 'foo-bar'
+     *
+     * _.kebabCase('fooBar');
+     * // => 'foo-bar'
+     *
+     * _.kebabCase('__FOO_BAR__');
+     * // => 'foo-bar'
+     */
+    var kebabCase = createCompounder(function(result, word, index) {
+      return result + (index ? '-' : '') + word.toLowerCase();
+    });
+
+    /**
+     * Converts `string`, as space separated words, to lower case.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category String
+     * @param {string} [string=''] The string to convert.
+     * @returns {string} Returns the lower cased string.
+     * @example
+     *
+     * _.lowerCase('--Foo-Bar--');
+     * // => 'foo bar'
+     *
+     * _.lowerCase('fooBar');
+     * // => 'foo bar'
+     *
+     * _.lowerCase('__FOO_BAR__');
+     * // => 'foo bar'
+     */
+    var lowerCase = createCompounder(function(result, word, index) {
+      return result + (index ? ' ' : '') + word.toLowerCase();
+    });
+
+    /**
+     * Converts the first character of `string` to lower case.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category String
+     * @param {string} [string=''] The string to convert.
+     * @returns {string} Returns the converted string.
+     * @example
+     *
+     * _.lowerFirst('Fred');
+     * // => 'fred'
+     *
+     * _.lowerFirst('FRED');
+     * // => 'fRED'
+     */
+    var lowerFirst = createCaseFirst('toLowerCase');
+
+    /**
+     * Pads `string` on the left and right sides if it's shorter than `length`.
+     * Padding characters are truncated if they can't be evenly divided by `length`.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category String
+     * @param {string} [string=''] The string to pad.
+     * @param {number} [length=0] The padding length.
+     * @param {string} [chars=' '] The string used as padding.
+     * @returns {string} Returns the padded string.
+     * @example
+     *
+     * _.pad('abc', 8);
+     * // => '  abc   '
+     *
+     * _.pad('abc', 8, '_-');
+     * // => '_-abc_-_'
+     *
+     * _.pad('abc', 3);
+     * // => 'abc'
+     */
+    function pad(string, length, chars) {
+      string = toString(string);
+      length = toInteger(length);
+
+      var strLength = length ? stringSize(string) : 0;
+      if (!length || strLength >= length) {
+        return string;
+      }
+      var mid = (length - strLength) / 2;
+      return (
+        createPadding(nativeFloor(mid), chars) +
+        string +
+        createPadding(nativeCeil(mid), chars)
+      );
+    }
+
+    /**
+     * Pads `string` on the right side if it's shorter than `length`. Padding
+     * characters are truncated if they exceed `length`.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category String
+     * @param {string} [string=''] The string to pad.
+     * @param {number} [length=0] The padding length.
+     * @param {string} [chars=' '] The string used as padding.
+     * @returns {string} Returns the padded string.
+     * @example
+     *
+     * _.padEnd('abc', 6);
+     * // => 'abc   '
+     *
+     * _.padEnd('abc', 6, '_-');
+     * // => 'abc_-_'
+     *
+     * _.padEnd('abc', 3);
+     * // => 'abc'
+     */
+    function padEnd(string, length, chars) {
+      string = toString(string);
+      length = toInteger(length);
+
+      var strLength = length ? stringSize(string) : 0;
+      return (length && strLength < length)
+        ? (string + createPadding(length - strLength, chars))
+        : string;
+    }
+
+    /**
+     * Pads `string` on the left side if it's shorter than `length`. Padding
+     * characters are truncated if they exceed `length`.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category String
+     * @param {string} [string=''] The string to pad.
+     * @param {number} [length=0] The padding length.
+     * @param {string} [chars=' '] The string used as padding.
+     * @returns {string} Returns the padded string.
+     * @example
+     *
+     * _.padStart('abc', 6);
+     * // => '   abc'
+     *
+     * _.padStart('abc', 6, '_-');
+     * // => '_-_abc'
+     *
+     * _.padStart('abc', 3);
+     * // => 'abc'
+     */
+    function padStart(string, length, chars) {
+      string = toString(string);
+      length = toInteger(length);
+
+      var strLength = length ? stringSize(string) : 0;
+      return (length && strLength < length)
+        ? (createPadding(length - strLength, chars) + string)
+        : string;
+    }
+
+    /**
+     * Converts `string` to an integer of the specified radix. If `radix` is
+     * `undefined` or `0`, a `radix` of `10` is used unless `value` is a
+     * hexadecimal, in which case a `radix` of `16` is used.
+     *
+     * **Note:** This method aligns with the
+     * [ES5 implementation](https://es5.github.io/#x15.1.2.2) of `parseInt`.
+     *
+     * @static
+     * @memberOf _
+     * @since 1.1.0
+     * @category String
+     * @param {string} string The string to convert.
+     * @param {number} [radix=10] The radix to interpret `value` by.
+     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
+     * @returns {number} Returns the converted integer.
+     * @example
+     *
+     * _.parseInt('08');
+     * // => 8
+     *
+     * _.map(['6', '08', '10'], _.parseInt);
+     * // => [6, 8, 10]
+     */
+    function parseInt(string, radix, guard) {
+      if (guard || radix == null) {
+        radix = 0;
+      } else if (radix) {
+        radix = +radix;
+      }
+      return nativeParseInt(toString(string).replace(reTrimStart, ''), radix || 0);
+    }
+
+    /**
+     * Repeats the given string `n` times.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category String
+     * @param {string} [string=''] The string to repeat.
+     * @param {number} [n=1] The number of times to repeat the string.
+     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
+     * @returns {string} Returns the repeated string.
+     * @example
+     *
+     * _.repeat('*', 3);
+     * // => '***'
+     *
+     * _.repeat('abc', 2);
+     * // => 'abcabc'
+     *
+     * _.repeat('abc', 0);
+     * // => ''
+     */
+    function repeat(string, n, guard) {
+      if ((guard ? isIterateeCall(string, n, guard) : n === undefined)) {
+        n = 1;
+      } else {
+        n = toInteger(n);
+      }
+      return baseRepeat(toString(string), n);
+    }
+
+    /**
+     * Replaces matches for `pattern` in `string` with `replacement`.
+     *
+     * **Note:** This method is based on
+     * [`String#replace`](https://mdn.io/String/replace).
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category String
+     * @param {string} [string=''] The string to modify.
+     * @param {RegExp|string} pattern The pattern to replace.
+     * @param {Function|string} replacement The match replacement.
+     * @returns {string} Returns the modified string.
+     * @example
+     *
+     * _.replace('Hi Fred', 'Fred', 'Barney');
+     * // => 'Hi Barney'
+     */
+    function replace() {
+      var args = arguments,
+          string = toString(args[0]);
+
+      return args.length < 3 ? string : string.replace(args[1], args[2]);
+    }
+
+    /**
+     * Converts `string` to
+     * [snake case](https://en.wikipedia.org/wiki/Snake_case).
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category String
+     * @param {string} [string=''] The string to convert.
+     * @returns {string} Returns the snake cased string.
+     * @example
+     *
+     * _.snakeCase('Foo Bar');
+     * // => 'foo_bar'
+     *
+     * _.snakeCase('fooBar');
+     * // => 'foo_bar'
+     *
+     * _.snakeCase('--FOO-BAR--');
+     * // => 'foo_bar'
+     */
+    var snakeCase = createCompounder(function(result, word, index) {
+      return result + (index ? '_' : '') + word.toLowerCase();
+    });
+
+    /**
+     * Splits `string` by `separator`.
+     *
+     * **Note:** This method is based on
+     * [`String#split`](https://mdn.io/String/split).
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category String
+     * @param {string} [string=''] The string to split.
+     * @param {RegExp|string} separator The separator pattern to split by.
+     * @param {number} [limit] The length to truncate results to.
+     * @returns {Array} Returns the string segments.
+     * @example
+     *
+     * _.split('a-b-c', '-', 2);
+     * // => ['a', 'b']
+     */
+    function split(string, separator, limit) {
+      if (limit && typeof limit != 'number' && isIterateeCall(string, separator, limit)) {
+        separator = limit = undefined;
+      }
+      limit = limit === undefined ? MAX_ARRAY_LENGTH : limit >>> 0;
+      if (!limit) {
+        return [];
+      }
+      string = toString(string);
+      if (string && (
+            typeof separator == 'string' ||
+            (separator != null && !isRegExp(separator))
+          )) {
+        separator = baseToString(separator);
+        if (!separator && hasUnicode(string)) {
+          return castSlice(stringToArray(string), 0, limit);
+        }
+      }
+      return string.split(separator, limit);
+    }
+
+    /**
+     * Converts `string` to
+     * [start case](https://en.wikipedia.org/wiki/Letter_case#Stylistic_or_specialised_usage).
+     *
+     * @static
+     * @memberOf _
+     * @since 3.1.0
+     * @category String
+     * @param {string} [string=''] The string to convert.
+     * @returns {string} Returns the start cased string.
+     * @example
+     *
+     * _.startCase('--foo-bar--');
+     * // => 'Foo Bar'
+     *
+     * _.startCase('fooBar');
+     * // => 'Foo Bar'
+     *
+     * _.startCase('__FOO_BAR__');
+     * // => 'FOO BAR'
+     */
+    var startCase = createCompounder(function(result, word, index) {
+      return result + (index ? ' ' : '') + upperFirst(word);
+    });
+
+    /**
+     * Checks if `string` starts with the given target string.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category String
+     * @param {string} [string=''] The string to inspect.
+     * @param {string} [target] The string to search for.
+     * @param {number} [position=0] The position to search from.
+     * @returns {boolean} Returns `true` if `string` starts with `target`,
+     *  else `false`.
+     * @example
+     *
+     * _.startsWith('abc', 'a');
+     * // => true
+     *
+     * _.startsWith('abc', 'b');
+     * // => false
+     *
+     * _.startsWith('abc', 'b', 1);
+     * // => true
+     */
+    function startsWith(string, target, position) {
+      string = toString(string);
+      position = position == null
+        ? 0
+        : baseClamp(toInteger(position), 0, string.length);
+
+      target = baseToString(target);
+      return string.slice(position, position + target.length) == target;
+    }
+
+    /**
+     * Creates a compiled template function that can interpolate data properties
+     * in "interpolate" delimiters, HTML-escape interpolated data properties in
+     * "escape" delimiters, and execute JavaScript in "evaluate" delimiters. Data
+     * properties may be accessed as free variables in the template. If a setting
+     * object is given, it takes precedence over `_.templateSettings` values.
+     *
+     * **Note:** In the development build `_.template` utilizes
+     * [sourceURLs](http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl)
+     * for easier debugging.
+     *
+     * For more information on precompiling templates see
+     * [lodash's custom builds documentation](https://lodash.com/custom-builds).
+     *
+     * For more information on Chrome extension sandboxes see
+     * [Chrome's extensions documentation](https://developer.chrome.com/extensions/sandboxingEval).
+     *
+     * @static
+     * @since 0.1.0
+     * @memberOf _
+     * @category String
+     * @param {string} [string=''] The template string.
+     * @param {Object} [options={}] The options object.
+     * @param {RegExp} [options.escape=_.templateSettings.escape]
+     *  The HTML "escape" delimiter.
+     * @param {RegExp} [options.evaluate=_.templateSettings.evaluate]
+     *  The "evaluate" delimiter.
+     * @param {Object} [options.imports=_.templateSettings.imports]
+     *  An object to import into the template as free variables.
+     * @param {RegExp} [options.interpolate=_.templateSettings.interpolate]
+     *  The "interpolate" delimiter.
+     * @param {string} [options.sourceURL='lodash.templateSources[n]']
+     *  The sourceURL of the compiled template.
+     * @param {string} [options.variable='obj']
+     *  The data object variable name.
+     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
+     * @returns {Function} Returns the compiled template function.
+     * @example
+     *
+     * // Use the "interpolate" delimiter to create a compiled template.
+     * var compiled = _.template('hello <%= user %>!');
+     * compiled({ 'user': 'fred' });
+     * // => 'hello fred!'
+     *
+     * // Use the HTML "escape" delimiter to escape data property values.
+     * var compiled = _.template('<b><%- value %></b>');
+     * compiled({ 'value': '<script>' });
+     * // => '<b>&lt;script&gt;</b>'
+     *
+     * // Use the "evaluate" delimiter to execute JavaScript and generate HTML.
+     * var compiled = _.template('<% _.forEach(users, function(user) { %><li><%- user %></li><% }); %>');
+     * compiled({ 'users': ['fred', 'barney'] });
+     * // => '<li>fred</li><li>barney</li>'
+     *
+     * // Use the internal `print` function in "evaluate" delimiters.
+     * var compiled = _.template('<% print("hello " + user); %>!');
+     * compiled({ 'user': 'barney' });
+     * // => 'hello barney!'
+     *
+     * // Use the ES template literal delimiter as an "interpolate" delimiter.
+     * // Disable support by replacing the "interpolate" delimiter.
+     * var compiled = _.template('hello ${ user }!');
+     * compiled({ 'user': 'pebbles' });
+     * // => 'hello pebbles!'
+     *
+     * // Use backslashes to treat delimiters as plain text.
+     * var compiled = _.template('<%= "\\<%- value %\\>" %>');
+     * compiled({ 'value': 'ignored' });
+     * // => '<%- value %>'
+     *
+     * // Use the `imports` option to import `jQuery` as `jq`.
+     * var text = '<% jq.each(users, function(user) { %><li><%- user %></li><% }); %>';
+     * var compiled = _.template(text, { 'imports': { 'jq': jQuery } });
+     * compiled({ 'users': ['fred', 'barney'] });
+     * // => '<li>fred</li><li>barney</li>'
+     *
+     * // Use the `sourceURL` option to specify a custom sourceURL for the template.
+     * var compiled = _.template('hello <%= user %>!', { 'sourceURL': '/basic/greeting.jst' });
+     * compiled(data);
+     * // => Find the source of "greeting.jst" under the Sources tab or Resources panel of the web inspector.
+     *
+     * // Use the `variable` option to ensure a with-statement isn't used in the compiled template.
+     * var compiled = _.template('hi <%= data.user %>!', { 'variable': 'data' });
+     * compiled.source;
+     * // => function(data) {
+     * //   var __t, __p = '';
+     * //   __p += 'hi ' + ((__t = ( data.user )) == null ? '' : __t) + '!';
+     * //   return __p;
+     * // }
+     *
+     * // Use custom template delimiters.
+     * _.templateSettings.interpolate = /{{([\s\S]+?)}}/g;
+     * var compiled = _.template('hello {{ user }}!');
+     * compiled({ 'user': 'mustache' });
+     * // => 'hello mustache!'
+     *
+     * // Use the `source` property to inline compiled templates for meaningful
+     * // line numbers in error messages and stack traces.
+     * fs.writeFileSync(path.join(process.cwd(), 'jst.js'), '\
+     *   var JST = {\
+     *     "main": ' + _.template(mainText).source + '\
+     *   };\
+     * ');
+     */
+    function template(string, options, guard) {
+      // Based on John Resig's `tmpl` implementation
+      // (http://ejohn.org/blog/javascript-micro-templating/)
+      // and Laura Doktorova's doT.js (https://github.com/olado/doT).
+      var settings = lodash.templateSettings;
+
+      if (guard && isIterateeCall(string, options, guard)) {
+        options = undefined;
+      }
+      string = toString(string);
+      options = assignInWith({}, options, settings, customDefaultsAssignIn);
+
+      var imports = assignInWith({}, options.imports, settings.imports, customDefaultsAssignIn),
+          importsKeys = keys(imports),
+          importsValues = baseValues(imports, importsKeys);
+
+      var isEscaping,
+          isEvaluating,
+          index = 0,
+          interpolate = options.interpolate || reNoMatch,
+          source = "__p += '";
+
+      // Compile the regexp to match each delimiter.
+      var reDelimiters = RegExp(
+        (options.escape || reNoMatch).source + '|' +
+        interpolate.source + '|' +
+        (interpolate === reInterpolate ? reEsTemplate : reNoMatch).source + '|' +
+        (options.evaluate || reNoMatch).source + '|$'
+      , 'g');
+
+      // Use a sourceURL for easier debugging.
+      // The sourceURL gets injected into the source that's eval-ed, so be careful
+      // to normalize all kinds of whitespace, so e.g. newlines (and unicode versions of it) can't sneak in
+      // and escape the comment, thus injecting code that gets evaled.
+      var sourceURL = '//# sourceURL=' +
+        (hasOwnProperty.call(options, 'sourceURL')
+          ? (options.sourceURL + '').replace(/\s/g, ' ')
+          : ('lodash.templateSources[' + (++templateCounter) + ']')
+        ) + '\n';
+
+      string.replace(reDelimiters, function(match, escapeValue, interpolateValue, esTemplateValue, evaluateValue, offset) {
+        interpolateValue || (interpolateValue = esTemplateValue);
+
+        // Escape characters that can't be included in string literals.
+        source += string.slice(index, offset).replace(reUnescapedString, escapeStringChar);
+
+        // Replace delimiters with snippets.
+        if (escapeValue) {
+          isEscaping = true;
+          source += "' +\n__e(" + escapeValue + ") +\n'";
+        }
+        if (evaluateValue) {
+          isEvaluating = true;
+          source += "';\n" + evaluateValue + ";\n__p += '";
+        }
+        if (interpolateValue) {
+          source += "' +\n((__t = (" + interpolateValue + ")) == null ? '' : __t) +\n'";
+        }
+        index = offset + match.length;
+
+        // The JS engine embedded in Adobe products needs `match` returned in
+        // order to produce the correct `offset` value.
+        return match;
+      });
+
+      source += "';\n";
+
+      // If `variable` is not specified wrap a with-statement around the generated
+      // code to add the data object to the top of the scope chain.
+      var variable = hasOwnProperty.call(options, 'variable') && options.variable;
+      if (!variable) {
+        source = 'with (obj) {\n' + source + '\n}\n';
+      }
+      // Cleanup code by stripping empty strings.
+      source = (isEvaluating ? source.replace(reEmptyStringLeading, '') : source)
+        .replace(reEmptyStringMiddle, '$1')
+        .replace(reEmptyStringTrailing, '$1;');
+
+      // Frame code as the function body.
+      source = 'function(' + (variable || 'obj') + ') {\n' +
+        (variable
+          ? ''
+          : 'obj || (obj = {});\n'
+        ) +
+        "var __t, __p = ''" +
+        (isEscaping
+           ? ', __e = _.escape'
+           : ''
+        ) +
+        (isEvaluating
+          ? ', __j = Array.prototype.join;\n' +
+            "function print() { __p += __j.call(arguments, '') }\n"
+          : ';\n'
+        ) +
+        source +
+        'return __p\n}';
+
+      var result = attempt(function() {
+        return Function(importsKeys, sourceURL + 'return ' + source)
+          .apply(undefined, importsValues);
+      });
+
+      // Provide the compiled function's source by its `toString` method or
+      // the `source` property as a convenience for inlining compiled templates.
+      result.source = source;
+      if (isError(result)) {
+        throw result;
+      }
+      return result;
+    }
+
+    /**
+     * Converts `string`, as a whole, to lower case just like
+     * [String#toLowerCase](https://mdn.io/toLowerCase).
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category String
+     * @param {string} [string=''] The string to convert.
+     * @returns {string} Returns the lower cased string.
+     * @example
+     *
+     * _.toLower('--Foo-Bar--');
+     * // => '--foo-bar--'
+     *
+     * _.toLower('fooBar');
+     * // => 'foobar'
+     *
+     * _.toLower('__FOO_BAR__');
+     * // => '__foo_bar__'
+     */
+    function toLower(value) {
+      return toString(value).toLowerCase();
+    }
+
+    /**
+     * Converts `string`, as a whole, to upper case just like
+     * [String#toUpperCase](https://mdn.io/toUpperCase).
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category String
+     * @param {string} [string=''] The string to convert.
+     * @returns {string} Returns the upper cased string.
+     * @example
+     *
+     * _.toUpper('--foo-bar--');
+     * // => '--FOO-BAR--'
+     *
+     * _.toUpper('fooBar');
+     * // => 'FOOBAR'
+     *
+     * _.toUpper('__foo_bar__');
+     * // => '__FOO_BAR__'
+     */
+    function toUpper(value) {
+      return toString(value).toUpperCase();
+    }
+
+    /**
+     * Removes leading and trailing whitespace or specified characters from `string`.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category String
+     * @param {string} [string=''] The string to trim.
+     * @param {string} [chars=whitespace] The characters to trim.
+     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
+     * @returns {string} Returns the trimmed string.
+     * @example
+     *
+     * _.trim('  abc  ');
+     * // => 'abc'
+     *
+     * _.trim('-_-abc-_-', '_-');
+     * // => 'abc'
+     *
+     * _.map(['  foo  ', '  bar  '], _.trim);
+     * // => ['foo', 'bar']
+     */
+    function trim(string, chars, guard) {
+      string = toString(string);
+      if (string && (guard || chars === undefined)) {
+        return string.replace(reTrim, '');
+      }
+      if (!string || !(chars = baseToString(chars))) {
+        return string;
+      }
+      var strSymbols = stringToArray(string),
+          chrSymbols = stringToArray(chars),
+          start = charsStartIndex(strSymbols, chrSymbols),
+          end = charsEndIndex(strSymbols, chrSymbols) + 1;
+
+      return castSlice(strSymbols, start, end).join('');
+    }
+
+    /**
+     * Removes trailing whitespace or specified characters from `string`.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category String
+     * @param {string} [string=''] The string to trim.
+     * @param {string} [chars=whitespace] The characters to trim.
+     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
+     * @returns {string} Returns the trimmed string.
+     * @example
+     *
+     * _.trimEnd('  abc  ');
+     * // => '  abc'
+     *
+     * _.trimEnd('-_-abc-_-', '_-');
+     * // => '-_-abc'
+     */
+    function trimEnd(string, chars, guard) {
+      string = toString(string);
+      if (string && (guard || chars === undefined)) {
+        return string.replace(reTrimEnd, '');
+      }
+      if (!string || !(chars = baseToString(chars))) {
+        return string;
+      }
+      var strSymbols = stringToArray(string),
+          end = charsEndIndex(strSymbols, stringToArray(chars)) + 1;
+
+      return castSlice(strSymbols, 0, end).join('');
+    }
+
+    /**
+     * Removes leading whitespace or specified characters from `string`.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category String
+     * @param {string} [string=''] The string to trim.
+     * @param {string} [chars=whitespace] The characters to trim.
+     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
+     * @returns {string} Returns the trimmed string.
+     * @example
+     *
+     * _.trimStart('  abc  ');
+     * // => 'abc  '
+     *
+     * _.trimStart('-_-abc-_-', '_-');
+     * // => 'abc-_-'
+     */
+    function trimStart(string, chars, guard) {
+      string = toString(string);
+      if (string && (guard || chars === undefined)) {
+        return string.replace(reTrimStart, '');
+      }
+      if (!string || !(chars = baseToString(chars))) {
+        return string;
+      }
+      var strSymbols = stringToArray(string),
+          start = charsStartIndex(strSymbols, stringToArray(chars));
+
+      return castSlice(strSymbols, start).join('');
+    }
+
+    /**
+     * Truncates `string` if it's longer than the given maximum string length.
+     * The last characters of the truncated string are replaced with the omission
+     * string which defaults to "...".
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category String
+     * @param {string} [string=''] The string to truncate.
+     * @param {Object} [options={}] The options object.
+     * @param {number} [options.length=30] The maximum string length.
+     * @param {string} [options.omission='...'] The string to indicate text is omitted.
+     * @param {RegExp|string} [options.separator] The separator pattern to truncate to.
+     * @returns {string} Returns the truncated string.
+     * @example
+     *
+     * _.truncate('hi-diddly-ho there, neighborino');
+     * // => 'hi-diddly-ho there, neighbo...'
+     *
+     * _.truncate('hi-diddly-ho there, neighborino', {
+     *   'length': 24,
+     *   'separator': ' '
+     * });
+     * // => 'hi-diddly-ho there,...'
+     *
+     * _.truncate('hi-diddly-ho there, neighborino', {
+     *   'length': 24,
+     *   'separator': /,? +/
+     * });
+     * // => 'hi-diddly-ho there...'
+     *
+     * _.truncate('hi-diddly-ho there, neighborino', {
+     *   'omission': ' [...]'
+     * });
+     * // => 'hi-diddly-ho there, neig [...]'
+     */
+    function truncate(string, options) {
+      var length = DEFAULT_TRUNC_LENGTH,
+          omission = DEFAULT_TRUNC_OMISSION;
+
+      if (isObject(options)) {
+        var separator = 'separator' in options ? options.separator : separator;
+        length = 'length' in options ? toInteger(options.length) : length;
+        omission = 'omission' in options ? baseToString(options.omission) : omission;
+      }
+      string = toString(string);
+
+      var strLength = string.length;
+      if (hasUnicode(string)) {
+        var strSymbols = stringToArray(string);
+        strLength = strSymbols.length;
+      }
+      if (length >= strLength) {
+        return string;
+      }
+      var end = length - stringSize(omission);
+      if (end < 1) {
+        return omission;
+      }
+      var result = strSymbols
+        ? castSlice(strSymbols, 0, end).join('')
+        : string.slice(0, end);
+
+      if (separator === undefined) {
+        return result + omission;
+      }
+      if (strSymbols) {
+        end += (result.length - end);
+      }
+      if (isRegExp(separator)) {
+        if (string.slice(end).search(separator)) {
+          var match,
+              substring = result;
+
+          if (!separator.global) {
+            separator = RegExp(separator.source, toString(reFlags.exec(separator)) + 'g');
+          }
+          separator.lastIndex = 0;
+          while ((match = separator.exec(substring))) {
+            var newEnd = match.index;
+          }
+          result = result.slice(0, newEnd === undefined ? end : newEnd);
+        }
+      } else if (string.indexOf(baseToString(separator), end) != end) {
+        var index = result.lastIndexOf(separator);
+        if (index > -1) {
+          result = result.slice(0, index);
+        }
+      }
+      return result + omission;
+    }
+
+    /**
+     * The inverse of `_.escape`; this method converts the HTML entities
+     * `&amp;`, `&lt;`, `&gt;`, `&quot;`, and `&#39;` in `string` to
+     * their corresponding characters.
+     *
+     * **Note:** No other HTML entities are unescaped. To unescape additional
+     * HTML entities use a third-party library like [_he_](https://mths.be/he).
+     *
+     * @static
+     * @memberOf _
+     * @since 0.6.0
+     * @category String
+     * @param {string} [string=''] The string to unescape.
+     * @returns {string} Returns the unescaped string.
+     * @example
+     *
+     * _.unescape('fred, barney, &amp; pebbles');
+     * // => 'fred, barney, & pebbles'
+     */
+    function unescape(string) {
+      string = toString(string);
+      return (string && reHasEscapedHtml.test(string))
+        ? string.replace(reEscapedHtml, unescapeHtmlChar)
+        : string;
+    }
+
+    /**
+     * Converts `string`, as space separated words, to upper case.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category String
+     * @param {string} [string=''] The string to convert.
+     * @returns {string} Returns the upper cased string.
+     * @example
+     *
+     * _.upperCase('--foo-bar');
+     * // => 'FOO BAR'
+     *
+     * _.upperCase('fooBar');
+     * // => 'FOO BAR'
+     *
+     * _.upperCase('__foo_bar__');
+     * // => 'FOO BAR'
+     */
+    var upperCase = createCompounder(function(result, word, index) {
+      return result + (index ? ' ' : '') + word.toUpperCase();
+    });
+
+    /**
+     * Converts the first character of `string` to upper case.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category String
+     * @param {string} [string=''] The string to convert.
+     * @returns {string} Returns the converted string.
+     * @example
+     *
+     * _.upperFirst('fred');
+     * // => 'Fred'
+     *
+     * _.upperFirst('FRED');
+     * // => 'FRED'
+     */
+    var upperFirst = createCaseFirst('toUpperCase');
+
+    /**
+     * Splits `string` into an array of its words.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category String
+     * @param {string} [string=''] The string to inspect.
+     * @param {RegExp|string} [pattern] The pattern to match words.
+     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
+     * @returns {Array} Returns the words of `string`.
+     * @example
+     *
+     * _.words('fred, barney, & pebbles');
+     * // => ['fred', 'barney', 'pebbles']
+     *
+     * _.words('fred, barney, & pebbles', /[^, ]+/g);
+     * // => ['fred', 'barney', '&', 'pebbles']
+     */
+    function words(string, pattern, guard) {
+      string = toString(string);
+      pattern = guard ? undefined : pattern;
+
+      if (pattern === undefined) {
+        return hasUnicodeWord(string) ? unicodeWords(string) : asciiWords(string);
+      }
+      return string.match(pattern) || [];
+    }
+
+    /*------------------------------------------------------------------------*/
+
+    /**
+     * Attempts to invoke `func`, returning either the result or the caught error
+     * object. Any additional arguments are provided to `func` when it's invoked.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category Util
+     * @param {Function} func The function to attempt.
+     * @param {...*} [args] The arguments to invoke `func` with.
+     * @returns {*} Returns the `func` result or error object.
+     * @example
+     *
+     * // Avoid throwing errors for invalid selectors.
+     * var elements = _.attempt(function(selector) {
+     *   return document.querySelectorAll(selector);
+     * }, '>_>');
+     *
+     * if (_.isError(elements)) {
+     *   elements = [];
+     * }
+     */
+    var attempt = baseRest(function(func, args) {
+      try {
+        return apply(func, undefined, args);
+      } catch (e) {
+        return isError(e) ? e : new Error(e);
+      }
+    });
+
+    /**
+     * Binds methods of an object to the object itself, overwriting the existing
+     * method.
+     *
+     * **Note:** This method doesn't set the "length" property of bound functions.
+     *
+     * @static
+     * @since 0.1.0
+     * @memberOf _
+     * @category Util
+     * @param {Object} object The object to bind and assign the bound methods to.
+     * @param {...(string|string[])} methodNames The object method names to bind.
+     * @returns {Object} Returns `object`.
+     * @example
+     *
+     * var view = {
+     *   'label': 'docs',
+     *   'click': function() {
+     *     console.log('clicked ' + this.label);
+     *   }
+     * };
+     *
+     * _.bindAll(view, ['click']);
+     * jQuery(element).on('click', view.click);
+     * // => Logs 'clicked docs' when clicked.
+     */
+    var bindAll = flatRest(function(object, methodNames) {
+      arrayEach(methodNames, function(key) {
+        key = toKey(key);
+        baseAssignValue(object, key, bind(object[key], object));
+      });
+      return object;
+    });
+
+    /**
+     * Creates a function that iterates over `pairs` and invokes the corresponding
+     * function of the first predicate to return truthy. The predicate-function
+     * pairs are invoked with the `this` binding and arguments of the created
+     * function.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Util
+     * @param {Array} pairs The predicate-function pairs.
+     * @returns {Function} Returns the new composite function.
+     * @example
+     *
+     * var func = _.cond([
+     *   [_.matches({ 'a': 1 }),           _.constant('matches A')],
+     *   [_.conforms({ 'b': _.isNumber }), _.constant('matches B')],
+     *   [_.stubTrue,                      _.constant('no match')]
+     * ]);
+     *
+     * func({ 'a': 1, 'b': 2 });
+     * // => 'matches A'
+     *
+     * func({ 'a': 0, 'b': 1 });
+     * // => 'matches B'
+     *
+     * func({ 'a': '1', 'b': '2' });
+     * // => 'no match'
+     */
+    function cond(pairs) {
+      var length = pairs == null ? 0 : pairs.length,
+          toIteratee = getIteratee();
+
+      pairs = !length ? [] : arrayMap(pairs, function(pair) {
+        if (typeof pair[1] != 'function') {
+          throw new TypeError(FUNC_ERROR_TEXT);
+        }
+        return [toIteratee(pair[0]), pair[1]];
+      });
+
+      return baseRest(function(args) {
+        var index = -1;
+        while (++index < length) {
+          var pair = pairs[index];
+          if (apply(pair[0], this, args)) {
+            return apply(pair[1], this, args);
+          }
+        }
+      });
+    }
+
+    /**
+     * Creates a function that invokes the predicate properties of `source` with
+     * the corresponding property values of a given object, returning `true` if
+     * all predicates return truthy, else `false`.
+     *
+     * **Note:** The created function is equivalent to `_.conformsTo` with
+     * `source` partially applied.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Util
+     * @param {Object} source The object of property predicates to conform to.
+     * @returns {Function} Returns the new spec function.
+     * @example
+     *
+     * var objects = [
+     *   { 'a': 2, 'b': 1 },
+     *   { 'a': 1, 'b': 2 }
+     * ];
+     *
+     * _.filter(objects, _.conforms({ 'b': function(n) { return n > 1; } }));
+     * // => [{ 'a': 1, 'b': 2 }]
+     */
+    function conforms(source) {
+      return baseConforms(baseClone(source, CLONE_DEEP_FLAG));
+    }
+
+    /**
+     * Creates a function that returns `value`.
+     *
+     * @static
+     * @memberOf _
+     * @since 2.4.0
+     * @category Util
+     * @param {*} value The value to return from the new function.
+     * @returns {Function} Returns the new constant function.
+     * @example
+     *
+     * var objects = _.times(2, _.constant({ 'a': 1 }));
+     *
+     * console.log(objects);
+     * // => [{ 'a': 1 }, { 'a': 1 }]
+     *
+     * console.log(objects[0] === objects[1]);
+     * // => true
+     */
+    function constant(value) {
+      return function() {
+        return value;
+      };
+    }
+
+    /**
+     * Checks `value` to determine whether a default value should be returned in
+     * its place. The `defaultValue` is returned if `value` is `NaN`, `null`,
+     * or `undefined`.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.14.0
+     * @category Util
+     * @param {*} value The value to check.
+     * @param {*} defaultValue The default value.
+     * @returns {*} Returns the resolved value.
+     * @example
+     *
+     * _.defaultTo(1, 10);
+     * // => 1
+     *
+     * _.defaultTo(undefined, 10);
+     * // => 10
+     */
+    function defaultTo(value, defaultValue) {
+      return (value == null || value !== value) ? defaultValue : value;
+    }
+
+    /**
+     * Creates a function that returns the result of invoking the given functions
+     * with the `this` binding of the created function, where each successive
+     * invocation is supplied the return value of the previous.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category Util
+     * @param {...(Function|Function[])} [funcs] The functions to invoke.
+     * @returns {Function} Returns the new composite function.
+     * @see _.flowRight
+     * @example
+     *
+     * function square(n) {
+     *   return n * n;
+     * }
+     *
+     * var addSquare = _.flow([_.add, square]);
+     * addSquare(1, 2);
+     * // => 9
+     */
+    var flow = createFlow();
+
+    /**
+     * This method is like `_.flow` except that it creates a function that
+     * invokes the given functions from right to left.
+     *
+     * @static
+     * @since 3.0.0
+     * @memberOf _
+     * @category Util
+     * @param {...(Function|Function[])} [funcs] The functions to invoke.
+     * @returns {Function} Returns the new composite function.
+     * @see _.flow
+     * @example
+     *
+     * function square(n) {
+     *   return n * n;
+     * }
+     *
+     * var addSquare = _.flowRight([square, _.add]);
+     * addSquare(1, 2);
+     * // => 9
+     */
+    var flowRight = createFlow(true);
+
+    /**
+     * This method returns the first argument it receives.
+     *
+     * @static
+     * @since 0.1.0
+     * @memberOf _
+     * @category Util
+     * @param {*} value Any value.
+     * @returns {*} Returns `value`.
+     * @example
+     *
+     * var object = { 'a': 1 };
+     *
+     * console.log(_.identity(object) === object);
+     * // => true
+     */
+    function identity(value) {
+      return value;
+    }
+
+    /**
+     * Creates a function that invokes `func` with the arguments of the created
+     * function. If `func` is a property name, the created function returns the
+     * property value for a given element. If `func` is an array or object, the
+     * created function returns `true` for elements that contain the equivalent
+     * source properties, otherwise it returns `false`.
+     *
+     * @static
+     * @since 4.0.0
+     * @memberOf _
+     * @category Util
+     * @param {*} [func=_.identity] The value to convert to a callback.
+     * @returns {Function} Returns the callback.
+     * @example
+     *
+     * var users = [
+     *   { 'user': 'barney', 'age': 36, 'active': true },
+     *   { 'user': 'fred',   'age': 40, 'active': false }
+     * ];
+     *
+     * // The `_.matches` iteratee shorthand.
+     * _.filter(users, _.iteratee({ 'user': 'barney', 'active': true }));
+     * // => [{ 'user': 'barney', 'age': 36, 'active': true }]
+     *
+     * // The `_.matchesProperty` iteratee shorthand.
+     * _.filter(users, _.iteratee(['user', 'fred']));
+     * // => [{ 'user': 'fred', 'age': 40 }]
+     *
+     * // The `_.property` iteratee shorthand.
+     * _.map(users, _.iteratee('user'));
+     * // => ['barney', 'fred']
+     *
+     * // Create custom iteratee shorthands.
+     * _.iteratee = _.wrap(_.iteratee, function(iteratee, func) {
+     *   return !_.isRegExp(func) ? iteratee(func) : function(string) {
+     *     return func.test(string);
+     *   };
+     * });
+     *
+     * _.filter(['abc', 'def'], /ef/);
+     * // => ['def']
+     */
+    function iteratee(func) {
+      return baseIteratee(typeof func == 'function' ? func : baseClone(func, CLONE_DEEP_FLAG));
+    }
+
+    /**
+     * Creates a function that performs a partial deep comparison between a given
+     * object and `source`, returning `true` if the given object has equivalent
+     * property values, else `false`.
+     *
+     * **Note:** The created function is equivalent to `_.isMatch` with `source`
+     * partially applied.
+     *
+     * Partial comparisons will match empty array and empty object `source`
+     * values against any array or object value, respectively. See `_.isEqual`
+     * for a list of supported value comparisons.
+     *
+     * **Note:** Multiple values can be checked by combining several matchers
+     * using `_.overSome`
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category Util
+     * @param {Object} source The object of property values to match.
+     * @returns {Function} Returns the new spec function.
+     * @example
+     *
+     * var objects = [
+     *   { 'a': 1, 'b': 2, 'c': 3 },
+     *   { 'a': 4, 'b': 5, 'c': 6 }
+     * ];
+     *
+     * _.filter(objects, _.matches({ 'a': 4, 'c': 6 }));
+     * // => [{ 'a': 4, 'b': 5, 'c': 6 }]
+     *
+     * // Checking for several possible values
+     * _.filter(users, _.overSome([_.matches({ 'a': 1 }), _.matches({ 'a': 4 })]));
+     * // => [{ 'a': 1, 'b': 2, 'c': 3 }, { 'a': 4, 'b': 5, 'c': 6 }]
+     */
+    function matches(source) {
+      return baseMatches(baseClone(source, CLONE_DEEP_FLAG));
+    }
+
+    /**
+     * Creates a function that performs a partial deep comparison between the
+     * value at `path` of a given object to `srcValue`, returning `true` if the
+     * object value is equivalent, else `false`.
+     *
+     * **Note:** Partial comparisons will match empty array and empty object
+     * `srcValue` values against any array or object value, respectively. See
+     * `_.isEqual` for a list of supported value comparisons.
+     *
+     * **Note:** Multiple values can be checked by combining several matchers
+     * using `_.overSome`
+     *
+     * @static
+     * @memberOf _
+     * @since 3.2.0
+     * @category Util
+     * @param {Array|string} path The path of the property to get.
+     * @param {*} srcValue The value to match.
+     * @returns {Function} Returns the new spec function.
+     * @example
+     *
+     * var objects = [
+     *   { 'a': 1, 'b': 2, 'c': 3 },
+     *   { 'a': 4, 'b': 5, 'c': 6 }
+     * ];
+     *
+     * _.find(objects, _.matchesProperty('a', 4));
+     * // => { 'a': 4, 'b': 5, 'c': 6 }
+     *
+     * // Checking for several possible values
+     * _.filter(users, _.overSome([_.matchesProperty('a', 1), _.matchesProperty('a', 4)]));
+     * // => [{ 'a': 1, 'b': 2, 'c': 3 }, { 'a': 4, 'b': 5, 'c': 6 }]
+     */
+    function matchesProperty(path, srcValue) {
+      return baseMatchesProperty(path, baseClone(srcValue, CLONE_DEEP_FLAG));
+    }
+
+    /**
+     * Creates a function that invokes the method at `path` of a given object.
+     * Any additional arguments are provided to the invoked method.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.7.0
+     * @category Util
+     * @param {Array|string} path The path of the method to invoke.
+     * @param {...*} [args] The arguments to invoke the method with.
+     * @returns {Function} Returns the new invoker function.
+     * @example
+     *
+     * var objects = [
+     *   { 'a': { 'b': _.constant(2) } },
+     *   { 'a': { 'b': _.constant(1) } }
+     * ];
+     *
+     * _.map(objects, _.method('a.b'));
+     * // => [2, 1]
+     *
+     * _.map(objects, _.method(['a', 'b']));
+     * // => [2, 1]
+     */
+    var method = baseRest(function(path, args) {
+      return function(object) {
+        return baseInvoke(object, path, args);
+      };
+    });
+
+    /**
+     * The opposite of `_.method`; this method creates a function that invokes
+     * the method at a given path of `object`. Any additional arguments are
+     * provided to the invoked method.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.7.0
+     * @category Util
+     * @param {Object} object The object to query.
+     * @param {...*} [args] The arguments to invoke the method with.
+     * @returns {Function} Returns the new invoker function.
+     * @example
+     *
+     * var array = _.times(3, _.constant),
+     *     object = { 'a': array, 'b': array, 'c': array };
+     *
+     * _.map(['a[2]', 'c[0]'], _.methodOf(object));
+     * // => [2, 0]
+     *
+     * _.map([['a', '2'], ['c', '0']], _.methodOf(object));
+     * // => [2, 0]
+     */
+    var methodOf = baseRest(function(object, args) {
+      return function(path) {
+        return baseInvoke(object, path, args);
+      };
+    });
+
+    /**
+     * Adds all own enumerable string keyed function properties of a source
+     * object to the destination object. If `object` is a function, then methods
+     * are added to its prototype as well.
+     *
+     * **Note:** Use `_.runInContext` to create a pristine `lodash` function to
+     * avoid conflicts caused by modifying the original.
+     *
+     * @static
+     * @since 0.1.0
+     * @memberOf _
+     * @category Util
+     * @param {Function|Object} [object=lodash] The destination object.
+     * @param {Object} source The object of functions to add.
+     * @param {Object} [options={}] The options object.
+     * @param {boolean} [options.chain=true] Specify whether mixins are chainable.
+     * @returns {Function|Object} Returns `object`.
+     * @example
+     *
+     * function vowels(string) {
+     *   return _.filter(string, function(v) {
+     *     return /[aeiou]/i.test(v);
+     *   });
+     * }
+     *
+     * _.mixin({ 'vowels': vowels });
+     * _.vowels('fred');
+     * // => ['e']
+     *
+     * _('fred').vowels().value();
+     * // => ['e']
+     *
+     * _.mixin({ 'vowels': vowels }, { 'chain': false });
+     * _('fred').vowels();
+     * // => ['e']
+     */
+    function mixin(object, source, options) {
+      var props = keys(source),
+          methodNames = baseFunctions(source, props);
+
+      if (options == null &&
+          !(isObject(source) && (methodNames.length || !props.length))) {
+        options = source;
+        source = object;
+        object = this;
+        methodNames = baseFunctions(source, keys(source));
+      }
+      var chain = !(isObject(options) && 'chain' in options) || !!options.chain,
+          isFunc = isFunction(object);
+
+      arrayEach(methodNames, function(methodName) {
+        var func = source[methodName];
+        object[methodName] = func;
+        if (isFunc) {
+          object.prototype[methodName] = function() {
+            var chainAll = this.__chain__;
+            if (chain || chainAll) {
+              var result = object(this.__wrapped__),
+                  actions = result.__actions__ = copyArray(this.__actions__);
+
+              actions.push({ 'func': func, 'args': arguments, 'thisArg': object });
+              result.__chain__ = chainAll;
+              return result;
+            }
+            return func.apply(object, arrayPush([this.value()], arguments));
+          };
+        }
+      });
+
+      return object;
+    }
+
+    /**
+     * Reverts the `_` variable to its previous value and returns a reference to
+     * the `lodash` function.
+     *
+     * @static
+     * @since 0.1.0
+     * @memberOf _
+     * @category Util
+     * @returns {Function} Returns the `lodash` function.
+     * @example
+     *
+     * var lodash = _.noConflict();
+     */
+    function noConflict() {
+      if (root._ === this) {
+        root._ = oldDash;
+      }
+      return this;
+    }
+
+    /**
+     * This method returns `undefined`.
+     *
+     * @static
+     * @memberOf _
+     * @since 2.3.0
+     * @category Util
+     * @example
+     *
+     * _.times(2, _.noop);
+     * // => [undefined, undefined]
+     */
+    function noop() {
+      // No operation performed.
+    }
+
+    /**
+     * Creates a function that gets the argument at index `n`. If `n` is negative,
+     * the nth argument from the end is returned.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Util
+     * @param {number} [n=0] The index of the argument to return.
+     * @returns {Function} Returns the new pass-thru function.
+     * @example
+     *
+     * var func = _.nthArg(1);
+     * func('a', 'b', 'c', 'd');
+     * // => 'b'
+     *
+     * var func = _.nthArg(-2);
+     * func('a', 'b', 'c', 'd');
+     * // => 'c'
+     */
+    function nthArg(n) {
+      n = toInteger(n);
+      return baseRest(function(args) {
+        return baseNth(args, n);
+      });
+    }
+
+    /**
+     * Creates a function that invokes `iteratees` with the arguments it receives
+     * and returns their results.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Util
+     * @param {...(Function|Function[])} [iteratees=[_.identity]]
+     *  The iteratees to invoke.
+     * @returns {Function} Returns the new function.
+     * @example
+     *
+     * var func = _.over([Math.max, Math.min]);
+     *
+     * func(1, 2, 3, 4);
+     * // => [4, 1]
+     */
+    var over = createOver(arrayMap);
+
+    /**
+     * Creates a function that checks if **all** of the `predicates` return
+     * truthy when invoked with the arguments it receives.
+     *
+     * Following shorthands are possible for providing predicates.
+     * Pass an `Object` and it will be used as an parameter for `_.matches` to create the predicate.
+     * Pass an `Array` of parameters for `_.matchesProperty` and the predicate will be created using them.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Util
+     * @param {...(Function|Function[])} [predicates=[_.identity]]
+     *  The predicates to check.
+     * @returns {Function} Returns the new function.
+     * @example
+     *
+     * var func = _.overEvery([Boolean, isFinite]);
+     *
+     * func('1');
+     * // => true
+     *
+     * func(null);
+     * // => false
+     *
+     * func(NaN);
+     * // => false
+     */
+    var overEvery = createOver(arrayEvery);
+
+    /**
+     * Creates a function that checks if **any** of the `predicates` return
+     * truthy when invoked with the arguments it receives.
+     *
+     * Following shorthands are possible for providing predicates.
+     * Pass an `Object` and it will be used as an parameter for `_.matches` to create the predicate.
+     * Pass an `Array` of parameters for `_.matchesProperty` and the predicate will be created using them.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Util
+     * @param {...(Function|Function[])} [predicates=[_.identity]]
+     *  The predicates to check.
+     * @returns {Function} Returns the new function.
+     * @example
+     *
+     * var func = _.overSome([Boolean, isFinite]);
+     *
+     * func('1');
+     * // => true
+     *
+     * func(null);
+     * // => true
+     *
+     * func(NaN);
+     * // => false
+     *
+     * var matchesFunc = _.overSome([{ 'a': 1 }, { 'a': 2 }])
+     * var matchesPropertyFunc = _.overSome([['a', 1], ['a', 2]])
+     */
+    var overSome = createOver(arraySome);
+
+    /**
+     * Creates a function that returns the value at `path` of a given object.
+     *
+     * @static
+     * @memberOf _
+     * @since 2.4.0
+     * @category Util
+     * @param {Array|string} path The path of the property to get.
+     * @returns {Function} Returns the new accessor function.
+     * @example
+     *
+     * var objects = [
+     *   { 'a': { 'b': 2 } },
+     *   { 'a': { 'b': 1 } }
+     * ];
+     *
+     * _.map(objects, _.property('a.b'));
+     * // => [2, 1]
+     *
+     * _.map(_.sortBy(objects, _.property(['a', 'b'])), 'a.b');
+     * // => [1, 2]
+     */
+    function property(path) {
+      return isKey(path) ? baseProperty(toKey(path)) : basePropertyDeep(path);
+    }
+
+    /**
+     * The opposite of `_.property`; this method creates a function that returns
+     * the value at a given path of `object`.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.0.0
+     * @category Util
+     * @param {Object} object The object to query.
+     * @returns {Function} Returns the new accessor function.
+     * @example
+     *
+     * var array = [0, 1, 2],
+     *     object = { 'a': array, 'b': array, 'c': array };
+     *
+     * _.map(['a[2]', 'c[0]'], _.propertyOf(object));
+     * // => [2, 0]
+     *
+     * _.map([['a', '2'], ['c', '0']], _.propertyOf(object));
+     * // => [2, 0]
+     */
+    function propertyOf(object) {
+      return function(path) {
+        return object == null ? undefined : baseGet(object, path);
+      };
+    }
+
+    /**
+     * Creates an array of numbers (positive and/or negative) progressing from
+     * `start` up to, but not including, `end`. A step of `-1` is used if a negative
+     * `start` is specified without an `end` or `step`. If `end` is not specified,
+     * it's set to `start` with `start` then set to `0`.
+     *
+     * **Note:** JavaScript follows the IEEE-754 standard for resolving
+     * floating-point values which can produce unexpected results.
+     *
+     * @static
+     * @since 0.1.0
+     * @memberOf _
+     * @category Util
+     * @param {number} [start=0] The start of the range.
+     * @param {number} end The end of the range.
+     * @param {number} [step=1] The value to increment or decrement by.
+     * @returns {Array} Returns the range of numbers.
+     * @see _.inRange, _.rangeRight
+     * @example
+     *
+     * _.range(4);
+     * // => [0, 1, 2, 3]
+     *
+     * _.range(-4);
+     * // => [0, -1, -2, -3]
+     *
+     * _.range(1, 5);
+     * // => [1, 2, 3, 4]
+     *
+     * _.range(0, 20, 5);
+     * // => [0, 5, 10, 15]
+     *
+     * _.range(0, -4, -1);
+     * // => [0, -1, -2, -3]
+     *
+     * _.range(1, 4, 0);
+     * // => [1, 1, 1]
+     *
+     * _.range(0);
+     * // => []
+     */
+    var range = createRange();
+
+    /**
+     * This method is like `_.range` except that it populates values in
+     * descending order.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Util
+     * @param {number} [start=0] The start of the range.
+     * @param {number} end The end of the range.
+     * @param {number} [step=1] The value to increment or decrement by.
+     * @returns {Array} Returns the range of numbers.
+     * @see _.inRange, _.range
+     * @example
+     *
+     * _.rangeRight(4);
+     * // => [3, 2, 1, 0]
+     *
+     * _.rangeRight(-4);
+     * // => [-3, -2, -1, 0]
+     *
+     * _.rangeRight(1, 5);
+     * // => [4, 3, 2, 1]
+     *
+     * _.rangeRight(0, 20, 5);
+     * // => [15, 10, 5, 0]
+     *
+     * _.rangeRight(0, -4, -1);
+     * // => [-3, -2, -1, 0]
+     *
+     * _.rangeRight(1, 4, 0);
+     * // => [1, 1, 1]
+     *
+     * _.rangeRight(0);
+     * // => []
+     */
+    var rangeRight = createRange(true);
+
+    /**
+     * This method returns a new empty array.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.13.0
+     * @category Util
+     * @returns {Array} Returns the new empty array.
+     * @example
+     *
+     * var arrays = _.times(2, _.stubArray);
+     *
+     * console.log(arrays);
+     * // => [[], []]
+     *
+     * console.log(arrays[0] === arrays[1]);
+     * // => false
+     */
+    function stubArray() {
+      return [];
+    }
+
+    /**
+     * This method returns `false`.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.13.0
+     * @category Util
+     * @returns {boolean} Returns `false`.
+     * @example
+     *
+     * _.times(2, _.stubFalse);
+     * // => [false, false]
+     */
+    function stubFalse() {
+      return false;
+    }
+
+    /**
+     * This method returns a new empty object.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.13.0
+     * @category Util
+     * @returns {Object} Returns the new empty object.
+     * @example
+     *
+     * var objects = _.times(2, _.stubObject);
+     *
+     * console.log(objects);
+     * // => [{}, {}]
+     *
+     * console.log(objects[0] === objects[1]);
+     * // => false
+     */
+    function stubObject() {
+      return {};
+    }
+
+    /**
+     * This method returns an empty string.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.13.0
+     * @category Util
+     * @returns {string} Returns the empty string.
+     * @example
+     *
+     * _.times(2, _.stubString);
+     * // => ['', '']
+     */
+    function stubString() {
+      return '';
+    }
+
+    /**
+     * This method returns `true`.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.13.0
+     * @category Util
+     * @returns {boolean} Returns `true`.
+     * @example
+     *
+     * _.times(2, _.stubTrue);
+     * // => [true, true]
+     */
+    function stubTrue() {
+      return true;
+    }
+
+    /**
+     * Invokes the iteratee `n` times, returning an array of the results of
+     * each invocation. The iteratee is invoked with one argument; (index).
+     *
+     * @static
+     * @since 0.1.0
+     * @memberOf _
+     * @category Util
+     * @param {number} n The number of times to invoke `iteratee`.
+     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+     * @returns {Array} Returns the array of results.
+     * @example
+     *
+     * _.times(3, String);
+     * // => ['0', '1', '2']
+     *
+     *  _.times(4, _.constant(0));
+     * // => [0, 0, 0, 0]
+     */
+    function times(n, iteratee) {
+      n = toInteger(n);
+      if (n < 1 || n > MAX_SAFE_INTEGER) {
+        return [];
+      }
+      var index = MAX_ARRAY_LENGTH,
+          length = nativeMin(n, MAX_ARRAY_LENGTH);
+
+      iteratee = getIteratee(iteratee);
+      n -= MAX_ARRAY_LENGTH;
+
+      var result = baseTimes(length, iteratee);
+      while (++index < n) {
+        iteratee(index);
+      }
+      return result;
+    }
+
+    /**
+     * Converts `value` to a property path array.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Util
+     * @param {*} value The value to convert.
+     * @returns {Array} Returns the new property path array.
+     * @example
+     *
+     * _.toPath('a.b.c');
+     * // => ['a', 'b', 'c']
+     *
+     * _.toPath('a[0].b.c');
+     * // => ['a', '0', 'b', 'c']
+     */
+    function toPath(value) {
+      if (isArray(value)) {
+        return arrayMap(value, toKey);
+      }
+      return isSymbol(value) ? [value] : copyArray(stringToPath(toString(value)));
+    }
+
+    /**
+     * Generates a unique ID. If `prefix` is given, the ID is appended to it.
+     *
+     * @static
+     * @since 0.1.0
+     * @memberOf _
+     * @category Util
+     * @param {string} [prefix=''] The value to prefix the ID with.
+     * @returns {string} Returns the unique ID.
+     * @example
+     *
+     * _.uniqueId('contact_');
+     * // => 'contact_104'
+     *
+     * _.uniqueId();
+     * // => '105'
+     */
+    function uniqueId(prefix) {
+      var id = ++idCounter;
+      return toString(prefix) + id;
+    }
+
+    /*------------------------------------------------------------------------*/
+
+    /**
+     * Adds two numbers.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.4.0
+     * @category Math
+     * @param {number} augend The first number in an addition.
+     * @param {number} addend The second number in an addition.
+     * @returns {number} Returns the total.
+     * @example
+     *
+     * _.add(6, 4);
+     * // => 10
+     */
+    var add = createMathOperation(function(augend, addend) {
+      return augend + addend;
+    }, 0);
+
+    /**
+     * Computes `number` rounded up to `precision`.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.10.0
+     * @category Math
+     * @param {number} number The number to round up.
+     * @param {number} [precision=0] The precision to round up to.
+     * @returns {number} Returns the rounded up number.
+     * @example
+     *
+     * _.ceil(4.006);
+     * // => 5
+     *
+     * _.ceil(6.004, 2);
+     * // => 6.01
+     *
+     * _.ceil(6040, -2);
+     * // => 6100
+     */
+    var ceil = createRound('ceil');
+
+    /**
+     * Divide two numbers.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.7.0
+     * @category Math
+     * @param {number} dividend The first number in a division.
+     * @param {number} divisor The second number in a division.
+     * @returns {number} Returns the quotient.
+     * @example
+     *
+     * _.divide(6, 4);
+     * // => 1.5
+     */
+    var divide = createMathOperation(function(dividend, divisor) {
+      return dividend / divisor;
+    }, 1);
+
+    /**
+     * Computes `number` rounded down to `precision`.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.10.0
+     * @category Math
+     * @param {number} number The number to round down.
+     * @param {number} [precision=0] The precision to round down to.
+     * @returns {number} Returns the rounded down number.
+     * @example
+     *
+     * _.floor(4.006);
+     * // => 4
+     *
+     * _.floor(0.046, 2);
+     * // => 0.04
+     *
+     * _.floor(4060, -2);
+     * // => 4000
+     */
+    var floor = createRound('floor');
+
+    /**
+     * Computes the maximum value of `array`. If `array` is empty or falsey,
+     * `undefined` is returned.
+     *
+     * @static
+     * @since 0.1.0
+     * @memberOf _
+     * @category Math
+     * @param {Array} array The array to iterate over.
+     * @returns {*} Returns the maximum value.
+     * @example
+     *
+     * _.max([4, 2, 8, 6]);
+     * // => 8
+     *
+     * _.max([]);
+     * // => undefined
+     */
+    function max(array) {
+      return (array && array.length)
+        ? baseExtremum(array, identity, baseGt)
+        : undefined;
+    }
+
+    /**
+     * This method is like `_.max` except that it accepts `iteratee` which is
+     * invoked for each element in `array` to generate the criterion by which
+     * the value is ranked. The iteratee is invoked with one argument: (value).
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Math
+     * @param {Array} array The array to iterate over.
+     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
+     * @returns {*} Returns the maximum value.
+     * @example
+     *
+     * var objects = [{ 'n': 1 }, { 'n': 2 }];
+     *
+     * _.maxBy(objects, function(o) { return o.n; });
+     * // => { 'n': 2 }
+     *
+     * // The `_.property` iteratee shorthand.
+     * _.maxBy(objects, 'n');
+     * // => { 'n': 2 }
+     */
+    function maxBy(array, iteratee) {
+      return (array && array.length)
+        ? baseExtremum(array, getIteratee(iteratee, 2), baseGt)
+        : undefined;
+    }
+
+    /**
+     * Computes the mean of the values in `array`.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Math
+     * @param {Array} array The array to iterate over.
+     * @returns {number} Returns the mean.
+     * @example
+     *
+     * _.mean([4, 2, 8, 6]);
+     * // => 5
+     */
+    function mean(array) {
+      return baseMean(array, identity);
+    }
+
+    /**
+     * This method is like `_.mean` except that it accepts `iteratee` which is
+     * invoked for each element in `array` to generate the value to be averaged.
+     * The iteratee is invoked with one argument: (value).
+     *
+     * @static
+     * @memberOf _
+     * @since 4.7.0
+     * @category Math
+     * @param {Array} array The array to iterate over.
+     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
+     * @returns {number} Returns the mean.
+     * @example
+     *
+     * var objects = [{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }];
+     *
+     * _.meanBy(objects, function(o) { return o.n; });
+     * // => 5
+     *
+     * // The `_.property` iteratee shorthand.
+     * _.meanBy(objects, 'n');
+     * // => 5
+     */
+    function meanBy(array, iteratee) {
+      return baseMean(array, getIteratee(iteratee, 2));
+    }
+
+    /**
+     * Computes the minimum value of `array`. If `array` is empty or falsey,
+     * `undefined` is returned.
+     *
+     * @static
+     * @since 0.1.0
+     * @memberOf _
+     * @category Math
+     * @param {Array} array The array to iterate over.
+     * @returns {*} Returns the minimum value.
+     * @example
+     *
+     * _.min([4, 2, 8, 6]);
+     * // => 2
+     *
+     * _.min([]);
+     * // => undefined
+     */
+    function min(array) {
+      return (array && array.length)
+        ? baseExtremum(array, identity, baseLt)
+        : undefined;
+    }
+
+    /**
+     * This method is like `_.min` except that it accepts `iteratee` which is
+     * invoked for each element in `array` to generate the criterion by which
+     * the value is ranked. The iteratee is invoked with one argument: (value).
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Math
+     * @param {Array} array The array to iterate over.
+     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
+     * @returns {*} Returns the minimum value.
+     * @example
+     *
+     * var objects = [{ 'n': 1 }, { 'n': 2 }];
+     *
+     * _.minBy(objects, function(o) { return o.n; });
+     * // => { 'n': 1 }
+     *
+     * // The `_.property` iteratee shorthand.
+     * _.minBy(objects, 'n');
+     * // => { 'n': 1 }
+     */
+    function minBy(array, iteratee) {
+      return (array && array.length)
+        ? baseExtremum(array, getIteratee(iteratee, 2), baseLt)
+        : undefined;
+    }
+
+    /**
+     * Multiply two numbers.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.7.0
+     * @category Math
+     * @param {number} multiplier The first number in a multiplication.
+     * @param {number} multiplicand The second number in a multiplication.
+     * @returns {number} Returns the product.
+     * @example
+     *
+     * _.multiply(6, 4);
+     * // => 24
+     */
+    var multiply = createMathOperation(function(multiplier, multiplicand) {
+      return multiplier * multiplicand;
+    }, 1);
+
+    /**
+     * Computes `number` rounded to `precision`.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.10.0
+     * @category Math
+     * @param {number} number The number to round.
+     * @param {number} [precision=0] The precision to round to.
+     * @returns {number} Returns the rounded number.
+     * @example
+     *
+     * _.round(4.006);
+     * // => 4
+     *
+     * _.round(4.006, 2);
+     * // => 4.01
+     *
+     * _.round(4060, -2);
+     * // => 4100
+     */
+    var round = createRound('round');
+
+    /**
+     * Subtract two numbers.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Math
+     * @param {number} minuend The first number in a subtraction.
+     * @param {number} subtrahend The second number in a subtraction.
+     * @returns {number} Returns the difference.
+     * @example
+     *
+     * _.subtract(6, 4);
+     * // => 2
+     */
+    var subtract = createMathOperation(function(minuend, subtrahend) {
+      return minuend - subtrahend;
+    }, 0);
+
+    /**
+     * Computes the sum of the values in `array`.
+     *
+     * @static
+     * @memberOf _
+     * @since 3.4.0
+     * @category Math
+     * @param {Array} array The array to iterate over.
+     * @returns {number} Returns the sum.
+     * @example
+     *
+     * _.sum([4, 2, 8, 6]);
+     * // => 20
+     */
+    function sum(array) {
+      return (array && array.length)
+        ? baseSum(array, identity)
+        : 0;
+    }
+
+    /**
+     * This method is like `_.sum` except that it accepts `iteratee` which is
+     * invoked for each element in `array` to generate the value to be summed.
+     * The iteratee is invoked with one argument: (value).
+     *
+     * @static
+     * @memberOf _
+     * @since 4.0.0
+     * @category Math
+     * @param {Array} array The array to iterate over.
+     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
+     * @returns {number} Returns the sum.
+     * @example
+     *
+     * var objects = [{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }];
+     *
+     * _.sumBy(objects, function(o) { return o.n; });
+     * // => 20
+     *
+     * // The `_.property` iteratee shorthand.
+     * _.sumBy(objects, 'n');
+     * // => 20
+     */
+    function sumBy(array, iteratee) {
+      return (array && array.length)
+        ? baseSum(array, getIteratee(iteratee, 2))
+        : 0;
+    }
+
+    /*------------------------------------------------------------------------*/
+
+    // Add methods that return wrapped values in chain sequences.
+    lodash.after = after;
+    lodash.ary = ary;
+    lodash.assign = assign;
+    lodash.assignIn = assignIn;
+    lodash.assignInWith = assignInWith;
+    lodash.assignWith = assignWith;
+    lodash.at = at;
+    lodash.before = before;
+    lodash.bind = bind;
+    lodash.bindAll = bindAll;
+    lodash.bindKey = bindKey;
+    lodash.castArray = castArray;
+    lodash.chain = chain;
+    lodash.chunk = chunk;
+    lodash.compact = compact;
+    lodash.concat = concat;
+    lodash.cond = cond;
+    lodash.conforms = conforms;
+    lodash.constant = constant;
+    lodash.countBy = countBy;
+    lodash.create = create;
+    lodash.curry = curry;
+    lodash.curryRight = curryRight;
+    lodash.debounce = debounce;
+    lodash.defaults = defaults;
+    lodash.defaultsDeep = defaultsDeep;
+    lodash.defer = defer;
+    lodash.delay = delay;
+    lodash.difference = difference;
+    lodash.differenceBy = differenceBy;
+    lodash.differenceWith = differenceWith;
+    lodash.drop = drop;
+    lodash.dropRight = dropRight;
+    lodash.dropRightWhile = dropRightWhile;
+    lodash.dropWhile = dropWhile;
+    lodash.fill = fill;
+    lodash.filter = filter;
+    lodash.flatMap = flatMap;
+    lodash.flatMapDeep = flatMapDeep;
+    lodash.flatMapDepth = flatMapDepth;
+    lodash.flatten = flatten;
+    lodash.flattenDeep = flattenDeep;
+    lodash.flattenDepth = flattenDepth;
+    lodash.flip = flip;
+    lodash.flow = flow;
+    lodash.flowRight = flowRight;
+    lodash.fromPairs = fromPairs;
+    lodash.functions = functions;
+    lodash.functionsIn = functionsIn;
+    lodash.groupBy = groupBy;
+    lodash.initial = initial;
+    lodash.intersection = intersection;
+    lodash.intersectionBy = intersectionBy;
+    lodash.intersectionWith = intersectionWith;
+    lodash.invert = invert;
+    lodash.invertBy = invertBy;
+    lodash.invokeMap = invokeMap;
+    lodash.iteratee = iteratee;
+    lodash.keyBy = keyBy;
+    lodash.keys = keys;
+    lodash.keysIn = keysIn;
+    lodash.map = map;
+    lodash.mapKeys = mapKeys;
+    lodash.mapValues = mapValues;
+    lodash.matches = matches;
+    lodash.matchesProperty = matchesProperty;
+    lodash.memoize = memoize;
+    lodash.merge = merge;
+    lodash.mergeWith = mergeWith;
+    lodash.method = method;
+    lodash.methodOf = methodOf;
+    lodash.mixin = mixin;
+    lodash.negate = negate;
+    lodash.nthArg = nthArg;
+    lodash.omit = omit;
+    lodash.omitBy = omitBy;
+    lodash.once = once;
+    lodash.orderBy = orderBy;
+    lodash.over = over;
+    lodash.overArgs = overArgs;
+    lodash.overEvery = overEvery;
+    lodash.overSome = overSome;
+    lodash.partial = partial;
+    lodash.partialRight = partialRight;
+    lodash.partition = partition;
+    lodash.pick = pick;
+    lodash.pickBy = pickBy;
+    lodash.property = property;
+    lodash.propertyOf = propertyOf;
+    lodash.pull = pull;
+    lodash.pullAll = pullAll;
+    lodash.pullAllBy = pullAllBy;
+    lodash.pullAllWith = pullAllWith;
+    lodash.pullAt = pullAt;
+    lodash.range = range;
+    lodash.rangeRight = rangeRight;
+    lodash.rearg = rearg;
+    lodash.reject = reject;
+    lodash.remove = remove;
+    lodash.rest = rest;
+    lodash.reverse = reverse;
+    lodash.sampleSize = sampleSize;
+    lodash.set = set;
+    lodash.setWith = setWith;
+    lodash.shuffle = shuffle;
+    lodash.slice = slice;
+    lodash.sortBy = sortBy;
+    lodash.sortedUniq = sortedUniq;
+    lodash.sortedUniqBy = sortedUniqBy;
+    lodash.split = split;
+    lodash.spread = spread;
+    lodash.tail = tail;
+    lodash.take = take;
+    lodash.takeRight = takeRight;
+    lodash.takeRightWhile = takeRightWhile;
+    lodash.takeWhile = takeWhile;
+    lodash.tap = tap;
+    lodash.throttle = throttle;
+    lodash.thru = thru;
+    lodash.toArray = toArray;
+    lodash.toPairs = toPairs;
+    lodash.toPairsIn = toPairsIn;
+    lodash.toPath = toPath;
+    lodash.toPlainObject = toPlainObject;
+    lodash.transform = transform;
+    lodash.unary = unary;
+    lodash.union = union;
+    lodash.unionBy = unionBy;
+    lodash.unionWith = unionWith;
+    lodash.uniq = uniq;
+    lodash.uniqBy = uniqBy;
+    lodash.uniqWith = uniqWith;
+    lodash.unset = unset;
+    lodash.unzip = unzip;
+    lodash.unzipWith = unzipWith;
+    lodash.update = update;
+    lodash.updateWith = updateWith;
+    lodash.values = values;
+    lodash.valuesIn = valuesIn;
+    lodash.without = without;
+    lodash.words = words;
+    lodash.wrap = wrap;
+    lodash.xor = xor;
+    lodash.xorBy = xorBy;
+    lodash.xorWith = xorWith;
+    lodash.zip = zip;
+    lodash.zipObject = zipObject;
+    lodash.zipObjectDeep = zipObjectDeep;
+    lodash.zipWith = zipWith;
+
+    // Add aliases.
+    lodash.entries = toPairs;
+    lodash.entriesIn = toPairsIn;
+    lodash.extend = assignIn;
+    lodash.extendWith = assignInWith;
+
+    // Add methods to `lodash.prototype`.
+    mixin(lodash, lodash);
+
+    /*------------------------------------------------------------------------*/
+
+    // Add methods that return unwrapped values in chain sequences.
+    lodash.add = add;
+    lodash.attempt = attempt;
+    lodash.camelCase = camelCase;
+    lodash.capitalize = capitalize;
+    lodash.ceil = ceil;
+    lodash.clamp = clamp;
+    lodash.clone = clone;
+    lodash.cloneDeep = cloneDeep;
+    lodash.cloneDeepWith = cloneDeepWith;
+    lodash.cloneWith = cloneWith;
+    lodash.conformsTo = conformsTo;
+    lodash.deburr = deburr;
+    lodash.defaultTo = defaultTo;
+    lodash.divide = divide;
+    lodash.endsWith = endsWith;
+    lodash.eq = eq;
+    lodash.escape = escape;
+    lodash.escapeRegExp = escapeRegExp;
+    lodash.every = every;
+    lodash.find = find;
+    lodash.findIndex = findIndex;
+    lodash.findKey = findKey;
+    lodash.findLast = findLast;
+    lodash.findLastIndex = findLastIndex;
+    lodash.findLastKey = findLastKey;
+    lodash.floor = floor;
+    lodash.forEach = forEach;
+    lodash.forEachRight = forEachRight;
+    lodash.forIn = forIn;
+    lodash.forInRight = forInRight;
+    lodash.forOwn = forOwn;
+    lodash.forOwnRight = forOwnRight;
+    lodash.get = get;
+    lodash.gt = gt;
+    lodash.gte = gte;
+    lodash.has = has;
+    lodash.hasIn = hasIn;
+    lodash.head = head;
+    lodash.identity = identity;
+    lodash.includes = includes;
+    lodash.indexOf = indexOf;
+    lodash.inRange = inRange;
+    lodash.invoke = invoke;
+    lodash.isArguments = isArguments;
+    lodash.isArray = isArray;
+    lodash.isArrayBuffer = isArrayBuffer;
+    lodash.isArrayLike = isArrayLike;
+    lodash.isArrayLikeObject = isArrayLikeObject;
+    lodash.isBoolean = isBoolean;
+    lodash.isBuffer = isBuffer;
+    lodash.isDate = isDate;
+    lodash.isElement = isElement;
+    lodash.isEmpty = isEmpty;
+    lodash.isEqual = isEqual;
+    lodash.isEqualWith = isEqualWith;
+    lodash.isError = isError;
+    lodash.isFinite = isFinite;
+    lodash.isFunction = isFunction;
+    lodash.isInteger = isInteger;
+    lodash.isLength = isLength;
+    lodash.isMap = isMap;
+    lodash.isMatch = isMatch;
+    lodash.isMatchWith = isMatchWith;
+    lodash.isNaN = isNaN;
+    lodash.isNative = isNative;
+    lodash.isNil = isNil;
+    lodash.isNull = isNull;
+    lodash.isNumber = isNumber;
+    lodash.isObject = isObject;
+    lodash.isObjectLike = isObjectLike;
+    lodash.isPlainObject = isPlainObject;
+    lodash.isRegExp = isRegExp;
+    lodash.isSafeInteger = isSafeInteger;
+    lodash.isSet = isSet;
+    lodash.isString = isString;
+    lodash.isSymbol = isSymbol;
+    lodash.isTypedArray = isTypedArray;
+    lodash.isUndefined = isUndefined;
+    lodash.isWeakMap = isWeakMap;
+    lodash.isWeakSet = isWeakSet;
+    lodash.join = join;
+    lodash.kebabCase = kebabCase;
+    lodash.last = last;
+    lodash.lastIndexOf = lastIndexOf;
+    lodash.lowerCase = lowerCase;
+    lodash.lowerFirst = lowerFirst;
+    lodash.lt = lt;
+    lodash.lte = lte;
+    lodash.max = max;
+    lodash.maxBy = maxBy;
+    lodash.mean = mean;
+    lodash.meanBy = meanBy;
+    lodash.min = min;
+    lodash.minBy = minBy;
+    lodash.stubArray = stubArray;
+    lodash.stubFalse = stubFalse;
+    lodash.stubObject = stubObject;
+    lodash.stubString = stubString;
+    lodash.stubTrue = stubTrue;
+    lodash.multiply = multiply;
+    lodash.nth = nth;
+    lodash.noConflict = noConflict;
+    lodash.noop = noop;
+    lodash.now = now;
+    lodash.pad = pad;
+    lodash.padEnd = padEnd;
+    lodash.padStart = padStart;
+    lodash.parseInt = parseInt;
+    lodash.random = random;
+    lodash.reduce = reduce;
+    lodash.reduceRight = reduceRight;
+    lodash.repeat = repeat;
+    lodash.replace = replace;
+    lodash.result = result;
+    lodash.round = round;
+    lodash.runInContext = runInContext;
+    lodash.sample = sample;
+    lodash.size = size;
+    lodash.snakeCase = snakeCase;
+    lodash.some = some;
+    lodash.sortedIndex = sortedIndex;
+    lodash.sortedIndexBy = sortedIndexBy;
+    lodash.sortedIndexOf = sortedIndexOf;
+    lodash.sortedLastIndex = sortedLastIndex;
+    lodash.sortedLastIndexBy = sortedLastIndexBy;
+    lodash.sortedLastIndexOf = sortedLastIndexOf;
+    lodash.startCase = startCase;
+    lodash.startsWith = startsWith;
+    lodash.subtract = subtract;
+    lodash.sum = sum;
+    lodash.sumBy = sumBy;
+    lodash.template = template;
+    lodash.times = times;
+    lodash.toFinite = toFinite;
+    lodash.toInteger = toInteger;
+    lodash.toLength = toLength;
+    lodash.toLower = toLower;
+    lodash.toNumber = toNumber;
+    lodash.toSafeInteger = toSafeInteger;
+    lodash.toString = toString;
+    lodash.toUpper = toUpper;
+    lodash.trim = trim;
+    lodash.trimEnd = trimEnd;
+    lodash.trimStart = trimStart;
+    lodash.truncate = truncate;
+    lodash.unescape = unescape;
+    lodash.uniqueId = uniqueId;
+    lodash.upperCase = upperCase;
+    lodash.upperFirst = upperFirst;
+
+    // Add aliases.
+    lodash.each = forEach;
+    lodash.eachRight = forEachRight;
+    lodash.first = head;
+
+    mixin(lodash, (function() {
+      var source = {};
+      baseForOwn(lodash, function(func, methodName) {
+        if (!hasOwnProperty.call(lodash.prototype, methodName)) {
+          source[methodName] = func;
+        }
+      });
+      return source;
+    }()), { 'chain': false });
+
+    /*------------------------------------------------------------------------*/
+
+    /**
+     * The semantic version number.
+     *
+     * @static
+     * @memberOf _
+     * @type {string}
+     */
+    lodash.VERSION = VERSION;
+
+    // Assign default placeholders.
+    arrayEach(['bind', 'bindKey', 'curry', 'curryRight', 'partial', 'partialRight'], function(methodName) {
+      lodash[methodName].placeholder = lodash;
+    });
+
+    // Add `LazyWrapper` methods for `_.drop` and `_.take` variants.
+    arrayEach(['drop', 'take'], function(methodName, index) {
+      LazyWrapper.prototype[methodName] = function(n) {
+        n = n === undefined ? 1 : nativeMax(toInteger(n), 0);
+
+        var result = (this.__filtered__ && !index)
+          ? new LazyWrapper(this)
+          : this.clone();
+
+        if (result.__filtered__) {
+          result.__takeCount__ = nativeMin(n, result.__takeCount__);
+        } else {
+          result.__views__.push({
+            'size': nativeMin(n, MAX_ARRAY_LENGTH),
+            'type': methodName + (result.__dir__ < 0 ? 'Right' : '')
+          });
+        }
+        return result;
+      };
+
+      LazyWrapper.prototype[methodName + 'Right'] = function(n) {
+        return this.reverse()[methodName](n).reverse();
+      };
+    });
+
+    // Add `LazyWrapper` methods that accept an `iteratee` value.
+    arrayEach(['filter', 'map', 'takeWhile'], function(methodName, index) {
+      var type = index + 1,
+          isFilter = type == LAZY_FILTER_FLAG || type == LAZY_WHILE_FLAG;
+
+      LazyWrapper.prototype[methodName] = function(iteratee) {
+        var result = this.clone();
+        result.__iteratees__.push({
+          'iteratee': getIteratee(iteratee, 3),
+          'type': type
+        });
+        result.__filtered__ = result.__filtered__ || isFilter;
+        return result;
+      };
+    });
+
+    // Add `LazyWrapper` methods for `_.head` and `_.last`.
+    arrayEach(['head', 'last'], function(methodName, index) {
+      var takeName = 'take' + (index ? 'Right' : '');
+
+      LazyWrapper.prototype[methodName] = function() {
+        return this[takeName](1).value()[0];
+      };
+    });
+
+    // Add `LazyWrapper` methods for `_.initial` and `_.tail`.
+    arrayEach(['initial', 'tail'], function(methodName, index) {
+      var dropName = 'drop' + (index ? '' : 'Right');
+
+      LazyWrapper.prototype[methodName] = function() {
+        return this.__filtered__ ? new LazyWrapper(this) : this[dropName](1);
+      };
+    });
+
+    LazyWrapper.prototype.compact = function() {
+      return this.filter(identity);
+    };
+
+    LazyWrapper.prototype.find = function(predicate) {
+      return this.filter(predicate).head();
+    };
+
+    LazyWrapper.prototype.findLast = function(predicate) {
+      return this.reverse().find(predicate);
+    };
+
+    LazyWrapper.prototype.invokeMap = baseRest(function(path, args) {
+      if (typeof path == 'function') {
+        return new LazyWrapper(this);
+      }
+      return this.map(function(value) {
+        return baseInvoke(value, path, args);
+      });
+    });
+
+    LazyWrapper.prototype.reject = function(predicate) {
+      return this.filter(negate(getIteratee(predicate)));
+    };
+
+    LazyWrapper.prototype.slice = function(start, end) {
+      start = toInteger(start);
+
+      var result = this;
+      if (result.__filtered__ && (start > 0 || end < 0)) {
+        return new LazyWrapper(result);
+      }
+      if (start < 0) {
+        result = result.takeRight(-start);
+      } else if (start) {
+        result = result.drop(start);
+      }
+      if (end !== undefined) {
+        end = toInteger(end);
+        result = end < 0 ? result.dropRight(-end) : result.take(end - start);
+      }
+      return result;
+    };
+
+    LazyWrapper.prototype.takeRightWhile = function(predicate) {
+      return this.reverse().takeWhile(predicate).reverse();
+    };
+
+    LazyWrapper.prototype.toArray = function() {
+      return this.take(MAX_ARRAY_LENGTH);
+    };
+
+    // Add `LazyWrapper` methods to `lodash.prototype`.
+    baseForOwn(LazyWrapper.prototype, function(func, methodName) {
+      var checkIteratee = /^(?:filter|find|map|reject)|While$/.test(methodName),
+          isTaker = /^(?:head|last)$/.test(methodName),
+          lodashFunc = lodash[isTaker ? ('take' + (methodName == 'last' ? 'Right' : '')) : methodName],
+          retUnwrapped = isTaker || /^find/.test(methodName);
+
+      if (!lodashFunc) {
+        return;
+      }
+      lodash.prototype[methodName] = function() {
+        var value = this.__wrapped__,
+            args = isTaker ? [1] : arguments,
+            isLazy = value instanceof LazyWrapper,
+            iteratee = args[0],
+            useLazy = isLazy || isArray(value);
+
+        var interceptor = function(value) {
+          var result = lodashFunc.apply(lodash, arrayPush([value], args));
+          return (isTaker && chainAll) ? result[0] : result;
+        };
+
+        if (useLazy && checkIteratee && typeof iteratee == 'function' && iteratee.length != 1) {
+          // Avoid lazy use if the iteratee has a "length" value other than `1`.
+          isLazy = useLazy = false;
+        }
+        var chainAll = this.__chain__,
+            isHybrid = !!this.__actions__.length,
+            isUnwrapped = retUnwrapped && !chainAll,
+            onlyLazy = isLazy && !isHybrid;
+
+        if (!retUnwrapped && useLazy) {
+          value = onlyLazy ? value : new LazyWrapper(this);
+          var result = func.apply(value, args);
+          result.__actions__.push({ 'func': thru, 'args': [interceptor], 'thisArg': undefined });
+          return new LodashWrapper(result, chainAll);
+        }
+        if (isUnwrapped && onlyLazy) {
+          return func.apply(this, args);
+        }
+        result = this.thru(interceptor);
+        return isUnwrapped ? (isTaker ? result.value()[0] : result.value()) : result;
+      };
+    });
+
+    // Add `Array` methods to `lodash.prototype`.
+    arrayEach(['pop', 'push', 'shift', 'sort', 'splice', 'unshift'], function(methodName) {
+      var func = arrayProto[methodName],
+          chainName = /^(?:push|sort|unshift)$/.test(methodName) ? 'tap' : 'thru',
+          retUnwrapped = /^(?:pop|shift)$/.test(methodName);
+
+      lodash.prototype[methodName] = function() {
+        var args = arguments;
+        if (retUnwrapped && !this.__chain__) {
+          var value = this.value();
+          return func.apply(isArray(value) ? value : [], args);
+        }
+        return this[chainName](function(value) {
+          return func.apply(isArray(value) ? value : [], args);
+        });
+      };
+    });
+
+    // Map minified method names to their real names.
+    baseForOwn(LazyWrapper.prototype, function(func, methodName) {
+      var lodashFunc = lodash[methodName];
+      if (lodashFunc) {
+        var key = lodashFunc.name + '';
+        if (!hasOwnProperty.call(realNames, key)) {
+          realNames[key] = [];
+        }
+        realNames[key].push({ 'name': methodName, 'func': lodashFunc });
+      }
+    });
+
+    realNames[createHybrid(undefined, WRAP_BIND_KEY_FLAG).name] = [{
+      'name': 'wrapper',
+      'func': undefined
+    }];
+
+    // Add methods to `LazyWrapper`.
+    LazyWrapper.prototype.clone = lazyClone;
+    LazyWrapper.prototype.reverse = lazyReverse;
+    LazyWrapper.prototype.value = lazyValue;
+
+    // Add chain sequence methods to the `lodash` wrapper.
+    lodash.prototype.at = wrapperAt;
+    lodash.prototype.chain = wrapperChain;
+    lodash.prototype.commit = wrapperCommit;
+    lodash.prototype.next = wrapperNext;
+    lodash.prototype.plant = wrapperPlant;
+    lodash.prototype.reverse = wrapperReverse;
+    lodash.prototype.toJSON = lodash.prototype.valueOf = lodash.prototype.value = wrapperValue;
+
+    // Add lazy aliases.
+    lodash.prototype.first = lodash.prototype.head;
+
+    if (symIterator) {
+      lodash.prototype[symIterator] = wrapperToIterator;
+    }
+    return lodash;
+  });
+
+  /*--------------------------------------------------------------------------*/
+
+  // Export lodash.
+  var _ = runInContext();
+
+  // Some AMD build optimizers, like r.js, check for condition patterns like:
+  if (typeof define == 'function' && typeof define.amd == 'object' && define.amd) {
+    // Expose Lodash on the global object to prevent errors when Lodash is
+    // loaded by a script tag in the presence of an AMD loader.
+    // See http://requirejs.org/docs/errors.html#mismatch for more details.
+    // Use `_.noConflict` to remove Lodash from the global object.
+    root._ = _;
+
+    // Define as an anonymous module so, through path mapping, it can be
+    // referenced as the "underscore" module.
+    define(function() {
+      return _;
+    });
+  }
+  // Check for `exports` after `define` in case a build optimizer adds it.
+  else if (freeModule) {
+    // Export for Node.js.
+    (freeModule.exports = _)._ = _;
+    // Export for CommonJS support.
+    freeExports._ = _;
+  }
+  else {
+    // Export to the global object.
+    root._ = _;
+  }
+}.call(this));
+
+}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
+},{}],17:[function(require,module,exports){
+/*
+ * Lexical analysis and token construction.
+ */
+
+"use strict";
+
+var _      = require("lodash");
+var events = require("events");
+var reg    = require("./reg.js");
+var state  = require("./state.js").state;
+
+var unicodeData = require("../data/ascii-identifier-data.js");
+var asciiIdentifierStartTable = unicodeData.asciiIdentifierStartTable;
+var asciiIdentifierPartTable = unicodeData.asciiIdentifierPartTable;
+var nonAsciiIdentifierStartTable = require("../data/non-ascii-identifier-start.js");
+var nonAsciiIdentifierPartTable = require("../data/non-ascii-identifier-part-only.js");
+// Loading of this module is deferred as an optimization for ES2015 input
+var es5IdentifierNames;
+
+// Some of these token types are from JavaScript Parser API
+// while others are specific to JSHint parser.
+// JS Parser API: https://developer.mozilla.org/en-US/docs/SpiderMonkey/Parser_API
+
+var Token = {
+  Identifier: 1,
+  Punctuator: 2,
+  NumericLiteral: 3,
+  StringLiteral: 4,
+  Comment: 5,
+  Keyword: 6,
+  RegExp: 9,
+  TemplateHead: 10,
+  TemplateMiddle: 11,
+  TemplateTail: 12,
+  NoSubstTemplate: 13
+};
+
+var Context = {
+  Block: 1,
+  Template: 2
+};
+
+function isHex(str) {
+  return /^[0-9a-fA-F]+$/.test(str);
+}
+
+function isHexDigit(str) {
+  return str.length === 1 && isHex(str);
+}
+
+// Object that handles postponed lexing verifications that checks the parsed
+// environment state.
+
+function asyncTrigger() {
+  var _checks = [];
+
+  return {
+    push: function(fn) {
+      _checks.push(fn);
+    },
+
+    check: function() {
+      for (var check = 0; check < _checks.length; ++check) {
+        _checks[check]();
+      }
+
+      _checks.splice(0, _checks.length);
+    }
+  };
+}
+
+/*
+ * Lexer for JSHint.
+ *
+ * This object does a char-by-char scan of the provided source code
+ * and produces a sequence of tokens.
+ *
+ *   var lex = new Lexer("var i = 0;");
+ *   lex.start();
+ *   lex.token(); // returns the next token
+ *
+ * You have to use the token() method to move the lexer forward
+ * but you don't have to use its return value to get tokens. In addition
+ * to token() method returning the next token, the Lexer object also
+ * emits events.
+ *
+ *   lex.on("Identifier", function(data) {
+ *     if (data.name.indexOf("_") >= 0) {
+ *       // Produce a warning.
+ *     }
+ *   });
+ *
+ * Note that the token() method returns tokens in a JSLint-compatible
+ * format while the event emitter uses a slightly modified version of
+ * Mozilla's JavaScript Parser API. Eventually, we will move away from
+ * JSLint format.
+ */
+function Lexer(source) {
+  var lines = source;
+
+  if (typeof lines === "string") {
+    lines = lines
+      .replace(/\r\n/g, "\n")
+      .replace(/\r/g, "\n")
+      .split("\n");
+  }
+
+  // If the first line is a shebang (#!), make it a blank and move on.
+  // Shebangs are used by Node scripts.
+
+  if (lines[0] && lines[0].substr(0, 2) === "#!") {
+    if (lines[0].indexOf("node") !== -1) {
+      state.option.node = true;
+    }
+    lines[0] = "";
+  }
+
+  this.emitter = new events.EventEmitter();
+  this.source = source;
+  this.setLines(lines);
+  this.prereg = true;
+
+  this.line = 0;
+  this.char = 1;
+  this.from = 1;
+  this.input = "";
+  this.inComment = false;
+  this.context = [];
+  this.templateStarts = [];
+
+  for (var i = 0; i < state.option.indent; i += 1) {
+    state.tab += " ";
+  }
+}
+
+Lexer.prototype = {
+  _lines: [],
+
+  inContext: function(ctxType) {
+    return this.context.length > 0 && this.context[this.context.length - 1].type === ctxType;
+  },
+
+  pushContext: function(ctxType) {
+    this.context.push({ type: ctxType });
+  },
+
+  popContext: function() {
+    return this.context.pop();
+  },
+
+  currentContext: function() {
+    return this.context.length > 0 && this.context[this.context.length - 1];
+  },
+
+  getLines: function() {
+    this._lines = state.lines;
+    return this._lines;
+  },
+
+  setLines: function(val) {
+    this._lines = val;
+    state.lines = this._lines;
+  },
+
+  /*
+   * Return the next i character without actually moving the
+   * char pointer.
+   */
+  peek: function(i) {
+    return this.input.charAt(i || 0);
+  },
+
+  /*
+   * Move the char pointer forward i times.
+   */
+  skip: function(i) {
+    i = i || 1;
+    this.char += i;
+    this.input = this.input.slice(i);
+  },
+
+  /*
+   * Subscribe to a token event. The API for this method is similar
+   * Underscore.js i.e. you can subscribe to multiple events with
+   * one call:
+   *
+   *   lex.on("Identifier Number", function(data) {
+   *     // ...
+   *   });
+   */
+  on: function(names, listener) {
+    names.split(" ").forEach(function(name) {
+      this.emitter.on(name, listener);
+    }.bind(this));
+  },
+
+  /*
+   * Trigger a token event. All arguments will be passed to each
+   * listener.
+   */
+  trigger: function() {
+    this.emitter.emit.apply(this.emitter, Array.prototype.slice.call(arguments));
+  },
+
+  /*
+   * Postpone a token event. the checking condition is set as
+   * last parameter, and the trigger function is called in a
+   * stored callback. To be later called using the check() function
+   * by the parser. This avoids parser's peek() to give the lexer
+   * a false context.
+   */
+  triggerAsync: function(type, args, checks, fn) {
+    checks.push(function() {
+      if (fn()) {
+        this.trigger(type, args);
+      }
+    }.bind(this));
+  },
+
+  /*
+   * Extract a punctuator out of the next sequence of characters
+   * or return 'null' if its not possible.
+   *
+   * This method's implementation was heavily influenced by the
+   * scanPunctuator function in the Esprima parser's source code.
+   */
+  scanPunctuator: function() {
+    var ch1 = this.peek();
+    var ch2, ch3, ch4;
+
+    switch (ch1) {
+    // Most common single-character punctuators
+    case ".":
+      if ((/^[0-9]$/).test(this.peek(1))) {
+        return null;
+      }
+      if (this.peek(1) === "." && this.peek(2) === ".") {
+        return {
+          type: Token.Punctuator,
+          value: "..."
+        };
+      }
+      /* falls through */
+    case "(":
+    case ")":
+    case ";":
+    case ",":
+    case "[":
+    case "]":
+    case ":":
+    case "~":
+    case "?":
+      return {
+        type: Token.Punctuator,
+        value: ch1
+      };
+
+    // A block/object opener
+    case "{":
+      this.pushContext(Context.Block);
+      return {
+        type: Token.Punctuator,
+        value: ch1
+      };
+
+    // A block/object closer
+    case "}":
+      if (this.inContext(Context.Block)) {
+        this.popContext();
+      }
+      return {
+        type: Token.Punctuator,
+        value: ch1
+      };
+
+    // A pound sign (for Node shebangs)
+    case "#":
+      return {
+        type: Token.Punctuator,
+        value: ch1
+      };
+
+    // We're at the end of input
+    case "":
+      return null;
+    }
+
+    // Peek more characters
+
+    ch2 = this.peek(1);
+    ch3 = this.peek(2);
+    ch4 = this.peek(3);
+
+    // 4-character punctuator: >>>=
+
+    if (ch1 === ">" && ch2 === ">" && ch3 === ">" && ch4 === "=") {
+      return {
+        type: Token.Punctuator,
+        value: ">>>="
+      };
+    }
+
+    // 3-character punctuators: === !== >>> <<= >>=
+
+    if (ch1 === "=" && ch2 === "=" && ch3 === "=") {
+      return {
+        type: Token.Punctuator,
+        value: "==="
+      };
+    }
+
+    if (ch1 === "!" && ch2 === "=" && ch3 === "=") {
+      return {
+        type: Token.Punctuator,
+        value: "!=="
+      };
+    }
+
+    if (ch1 === ">" && ch2 === ">" && ch3 === ">") {
+      return {
+        type: Token.Punctuator,
+        value: ">>>"
+      };
+    }
+
+    if (ch1 === "<" && ch2 === "<" && ch3 === "=") {
+      return {
+        type: Token.Punctuator,
+        value: "<<="
+      };
+    }
+
+    if (ch1 === ">" && ch2 === ">" && ch3 === "=") {
+      return {
+        type: Token.Punctuator,
+        value: ">>="
+      };
+    }
+
+    // Fat arrow punctuator
+    if (ch1 === "=" && ch2 === ">") {
+      return {
+        type: Token.Punctuator,
+        value: ch1 + ch2
+      };
+    }
+
+    // 2-character punctuators: ++ -- << >> && || **
+    if (ch1 === ch2 && ("+-<>&|*".indexOf(ch1) >= 0)) {
+      if (ch1 === "*" && ch3 === "=") {
+        return {
+          type: Token.Punctuator,
+          value: ch1 + ch2 + ch3
+        };
+      }
+
+      return {
+        type: Token.Punctuator,
+        value: ch1 + ch2
+      };
+    }
+
+    // <= >= != += -= *= %= &= |= ^= /=
+    if ("<>=!+-*%&|^/".indexOf(ch1) >= 0) {
+      if (ch2 === "=") {
+        return {
+          type: Token.Punctuator,
+          value: ch1 + ch2
+        };
+      }
+
+      return {
+        type: Token.Punctuator,
+        value: ch1
+      };
+    }
+
+    return null;
+  },
+
+  /*
+   * Extract a comment out of the next sequence of characters and/or
+   * lines or return 'null' if its not possible. Since comments can
+   * span across multiple lines this method has to move the char
+   * pointer.
+   *
+   * In addition to normal JavaScript comments (// and /*) this method
+   * also recognizes JSHint- and JSLint-specific comments such as
+   * /*jshint, /*jslint, /*globals and so on.
+   */
+  scanComments: function(checks) {
+    var ch1 = this.peek();
+    var ch2 = this.peek(1);
+    var rest = this.input.substr(2);
+    var startLine = this.line;
+    var startChar = this.char;
+    var self = this;
+
+    // Create a comment token object and make sure it
+    // has all the data JSHint needs to work with special
+    // comments.
+
+    function commentToken(label, body, opt) {
+      var special = [
+        "jshint", "jshint.unstable", "jslint", "members", "member", "globals",
+        "global", "exported"
+      ];
+      var isSpecial = false;
+      var value = label + body;
+      var commentType = "plain";
+      opt = opt || {};
+
+      if (opt.isMultiline) {
+        value += "*/";
+      }
+
+      body = body.replace(/\n/g, " ");
+
+      if (label === "/*" && reg.fallsThrough.test(body)) {
+        isSpecial = true;
+        commentType = "falls through";
+      }
+
+      special.forEach(function(str) {
+        if (isSpecial) {
+          return;
+        }
+
+        // Don't recognize any special comments other than jshint for single-line
+        // comments. This introduced many problems with legit comments.
+        if (label === "//" && str !== "jshint" && str !== "jshint.unstable") {
+          return;
+        }
+
+        if (body.charAt(str.length) === " " && body.substr(0, str.length) === str) {
+          isSpecial = true;
+          label = label + str;
+          body = body.substr(str.length);
+        }
+
+        if (!isSpecial && body.charAt(0) === " " && body.charAt(str.length + 1) === " " &&
+          body.substr(1, str.length) === str) {
+          isSpecial = true;
+          label = label + " " + str;
+          body = body.substr(str.length + 1);
+        }
+
+        // To handle rarer case when special word is separated from label by
+        // multiple spaces or tabs
+        var strIndex = body.indexOf(str);
+        if (!isSpecial && strIndex >= 0 && body.charAt(strIndex + str.length) === " ") {
+          var isAllWhitespace = body.substr(0, strIndex).trim().length === 0;
+          if (isAllWhitespace) {
+            isSpecial = true;
+            body = body.substr(str.length + strIndex);
+          }
+        }
+
+        if (!isSpecial) {
+          return;
+        }
+
+        switch (str) {
+        case "member":
+          commentType = "members";
+          break;
+        case "global":
+          commentType = "globals";
+          break;
+        default:
+          var options = body.split(":").map(function(v) {
+            return v.replace(/^\s+/, "").replace(/\s+$/, "");
+          });
+
+          if (options.length === 2) {
+            switch (options[0]) {
+            case "ignore":
+              switch (options[1]) {
+              case "start":
+                self.ignoringLinterErrors = true;
+                isSpecial = false;
+                break;
+              case "end":
+                self.ignoringLinterErrors = false;
+                isSpecial = false;
+                break;
+              }
+            }
+          }
+
+          commentType = str;
+        }
+      });
+
+      return {
+        type: Token.Comment,
+        commentType: commentType,
+        value: value,
+        body: body,
+        isSpecial: isSpecial,
+        isMalformed: opt.isMalformed || false
+      };
+    }
+
+    // End of unbegun comment. Raise an error and skip that input.
+    if (ch1 === "*" && ch2 === "/") {
+      this.trigger("error", {
+        code: "E018",
+        line: startLine,
+        character: startChar
+      });
+
+      this.skip(2);
+      return null;
+    }
+
+    // Comments must start either with // or /*
+    if (ch1 !== "/" || (ch2 !== "*" && ch2 !== "/")) {
+      return null;
+    }
+
+    // One-line comment
+    if (ch2 === "/") {
+      this.skip(this.input.length); // Skip to the EOL.
+      return commentToken("//", rest);
+    }
+
+    var body = "";
+
+    /* Multi-line comment */
+    if (ch2 === "*") {
+      this.inComment = true;
+      this.skip(2);
+
+      while (this.peek() !== "*" || this.peek(1) !== "/") {
+        if (this.peek() === "") { // End of Line
+          body += "\n";
+
+          // If we hit EOF and our comment is still unclosed,
+          // trigger an error and end the comment implicitly.
+          if (!this.nextLine(checks)) {
+            this.trigger("error", {
+              code: "E017",
+              line: startLine,
+              character: startChar
+            });
+
+            this.inComment = false;
+            return commentToken("/*", body, {
+              isMultiline: true,
+              isMalformed: true
+            });
+          }
+        } else {
+          body += this.peek();
+          this.skip();
+        }
+      }
+
+      this.skip(2);
+      this.inComment = false;
+      return commentToken("/*", body, { isMultiline: true });
+    }
+  },
+
+  /*
+   * Extract a keyword out of the next sequence of characters or
+   * return 'null' if its not possible.
+   */
+  scanKeyword: function() {
+    var result = /^[a-zA-Z_$][a-zA-Z0-9_$]*/.exec(this.input);
+    var keywords = [
+      "if", "in", "do", "var", "for", "new",
+      "try", "let", "this", "else", "case",
+      "void", "with", "enum", "while", "break",
+      "catch", "throw", "const", "yield", "class",
+      "super", "return", "typeof", "delete",
+      "switch", "export", "import", "default",
+      "finally", "extends", "function", "continue",
+      "debugger", "instanceof", "true", "false", "null", "async", "await"
+    ];
+
+    if (result && keywords.indexOf(result[0]) >= 0) {
+      return {
+        type: Token.Keyword,
+        value: result[0]
+      };
+    }
+
+    return null;
+  },
+
+  /*
+   * Extract a JavaScript identifier out of the next sequence of
+   * characters or return 'null' if its not possible.
+   */
+  scanIdentifier: function(checks) {
+    var id = "";
+    var index = 0;
+    var char, value;
+
+    function isNonAsciiIdentifierStart(code) {
+      return nonAsciiIdentifierStartTable.indexOf(code) > -1;
+    }
+
+    function isNonAsciiIdentifierPart(code) {
+      return isNonAsciiIdentifierStart(code) || nonAsciiIdentifierPartTable.indexOf(code) > -1;
+    }
+
+    var readUnicodeEscapeSequence = function() {
+      /*jshint validthis:true */
+      index += 1;
+
+      if (this.peek(index) !== "u") {
+        return null;
+      }
+
+      var sequence = this.peek(index + 1) + this.peek(index + 2) +
+        this.peek(index + 3) + this.peek(index + 4);
+      var code;
+
+      if (isHex(sequence)) {
+        code = parseInt(sequence, 16);
+
+        if (asciiIdentifierPartTable[code] || isNonAsciiIdentifierPart(code)) {
+          index += 5;
+          return "\\u" + sequence;
+        }
+
+        return null;
+      }
+
+      return null;
+    }.bind(this);
+
+    var getIdentifierStart = function() {
+      /*jshint validthis:true */
+      var chr = this.peek(index);
+      var code = chr.charCodeAt(0);
+
+      if (code === 92) {
+        return readUnicodeEscapeSequence();
+      }
+
+      if (code < 128) {
+        if (asciiIdentifierStartTable[code]) {
+          index += 1;
+          return chr;
+        }
+
+        return null;
+      }
+
+      if (isNonAsciiIdentifierStart(code)) {
+        index += 1;
+        return chr;
+      }
+
+      return null;
+    }.bind(this);
+
+    var getIdentifierPart = function() {
+      /*jshint validthis:true */
+      var chr = this.peek(index);
+      var code = chr.charCodeAt(0);
+
+      if (code === 92) {
+        return readUnicodeEscapeSequence();
+      }
+
+      if (code < 128) {
+        if (asciiIdentifierPartTable[code]) {
+          index += 1;
+          return chr;
+        }
+
+        return null;
+      }
+
+      if (isNonAsciiIdentifierPart(code)) {
+        index += 1;
+        return chr;
+      }
+
+      return null;
+    }.bind(this);
+
+    function removeEscapeSequences(id) {
+      return id.replace(/\\u([0-9a-fA-F]{4})/g, function(m0, codepoint) {
+        return String.fromCharCode(parseInt(codepoint, 16));
+      });
+    }
+
+    char = getIdentifierStart();
+    if (char === null) {
+      return null;
+    }
+
+    id = char;
+    for (;;) {
+      char = getIdentifierPart();
+
+      if (char === null) {
+        break;
+      }
+
+      id += char;
+    }
+
+    value = removeEscapeSequences(id);
+
+    if (!state.inES6(true)) {
+      es5IdentifierNames = require("../data/es5-identifier-names.js");
+
+      if (!es5IdentifierNames.test(value)) {
+        this.triggerAsync(
+          "warning",
+          {
+            code: "W119",
+            line: this.line,
+            character: this.char,
+            data: ["unicode 8", "6"]
+          },
+          checks,
+          function() { return true; }
+        );
+      }
+    }
+
+    return {
+      type: Token.Identifier,
+      value: value,
+      text: id,
+      tokenLength: id.length
+    };
+  },
+
+  /*
+   * Extract a numeric literal out of the next sequence of
+   * characters or return 'null' if its not possible. This method
+   * supports all numeric literals described in section 7.8.3
+   * of the EcmaScript 5 specification.
+   *
+   * This method's implementation was heavily influenced by the
+   * scanNumericLiteral function in the Esprima parser's source code.
+   */
+  scanNumericLiteral: function(checks) {
+    var index = 0;
+    var value = "";
+    var length = this.input.length;
+    var char = this.peek(index);
+    var isAllowedDigit = isDecimalDigit;
+    var base = 10;
+    var isLegacy = false;
+    var isNonOctal = false;
+
+    function isDecimalDigit(str) {
+      return (/^[0-9]$/).test(str);
+    }
+
+    function isOctalDigit(str) {
+      return (/^[0-7]$/).test(str);
+    }
+
+    function isNonOctalDigit(str) {
+      return str === "8" || str === "9";
+    }
+
+    function isBinaryDigit(str) {
+      return (/^[01]$/).test(str);
+    }
+
+    function isIdentifierStart(ch) {
+      return (ch === "$") || (ch === "_") || (ch === "\\") ||
+        (ch >= "a" && ch <= "z") || (ch >= "A" && ch <= "Z");
+    }
+
+    // Numbers must start either with a decimal digit or a point.
+
+    if (char !== "." && !isDecimalDigit(char)) {
+      return null;
+    }
+
+    if (char !== ".") {
+      value = this.peek(index);
+      index += 1;
+      char = this.peek(index);
+
+      if (value === "0") {
+        // Base-16 numbers.
+        if (char === "x" || char === "X") {
+          isAllowedDigit = isHexDigit;
+          base = 16;
+
+          index += 1;
+          value += char;
+        }
+
+        // Base-8 numbers.
+        if (char === "o" || char === "O") {
+          isAllowedDigit = isOctalDigit;
+          base = 8;
+
+          if (!state.inES6(true)) {
+            this.triggerAsync(
+              "warning",
+              {
+                code: "W119",
+                line: this.line,
+                character: this.char,
+                data: [ "Octal integer literal", "6" ]
+              },
+              checks,
+              function() { return true; }
+            );
+          }
+
+          index += 1;
+          value += char;
+        }
+
+        // Base-2 numbers.
+        if (char === "b" || char === "B") {
+          isAllowedDigit = isBinaryDigit;
+          base = 2;
+
+          if (!state.inES6(true)) {
+            this.triggerAsync(
+              "warning",
+              {
+                code: "W119",
+                line: this.line,
+                character: this.char,
+                data: [ "Binary integer literal", "6" ]
+              },
+              checks,
+              function() { return true; }
+            );
+          }
+
+          index += 1;
+          value += char;
+        }
+
+        // Legacy base-8 numbers.
+        if (isOctalDigit(char)) {
+          isAllowedDigit = isOctalDigit;
+          base = 8;
+          isLegacy = true;
+
+        } else if (isDecimalDigit(char)) {
+          isNonOctal = true;
+        }
+      }
+
+      while (index < length) {
+        char = this.peek(index);
+
+        if (isLegacy && isNonOctalDigit(char)) {
+          base = 10;
+          isLegacy = false;
+          isNonOctal = true;
+          isAllowedDigit = isDecimalDigit;
+        }
+
+        if (!isAllowedDigit(char)) {
+          break;
+        }
+        value += char;
+        index += 1;
+      }
+
+      var isBigInt = this.peek(index) === 'n';
+
+      if (isAllowedDigit !== isDecimalDigit || isBigInt) {
+        if (isBigInt) {
+          if (!state.option.unstable.bigint) {
+            this.triggerAsync(
+              "warning",
+              {
+                code: "W144",
+                line: this.line,
+                character: this.char,
+                data: [ "BigInt", "bigint" ]
+              },
+              checks,
+              function() { return true; }
+            );
+          }
+
+          if (isLegacy || isNonOctal) {
+            this.triggerAsync(
+              "error",
+              {
+                code: "E067",
+                line: this.line,
+                character: this.char,
+                data: [value + char]
+              },
+              checks,
+              function() { return true; }
+            );
+          }
+
+          value += char;
+          index += 1;
+        } else if (!isLegacy && value.length <= 2) { // 0x
+          return {
+            type: Token.NumericLiteral,
+            value: value,
+            isMalformed: true
+          };
+        }
+
+        if (index < length) {
+          char = this.peek(index);
+          if (isIdentifierStart(char)) {
+            return null;
+          }
+        }
+
+        return {
+          type: Token.NumericLiteral,
+          value: value,
+          base: base,
+          isLegacy: isLegacy,
+          isMalformed: false
+        };
+      }
+    }
+
+    // Decimal digits.
+
+    if (char === ".") {
+      value += char;
+      index += 1;
+
+      while (index < length) {
+        char = this.peek(index);
+        if (!isDecimalDigit(char)) {
+          break;
+        }
+        value += char;
+        index += 1;
+      }
+    }
+
+    // Exponent part.
+
+    if (char === "e" || char === "E") {
+      value += char;
+      index += 1;
+      char = this.peek(index);
+
+      if (char === "+" || char === "-") {
+        value += this.peek(index);
+        index += 1;
+      }
+
+      char = this.peek(index);
+      if (isDecimalDigit(char)) {
+        value += char;
+        index += 1;
+
+        while (index < length) {
+          char = this.peek(index);
+          if (!isDecimalDigit(char)) {
+            break;
+          }
+          value += char;
+          index += 1;
+        }
+      } else {
+        return null;
+      }
+    }
+
+    if (index < length) {
+      char = this.peek(index);
+      if (isIdentifierStart(char)) {
+        return null;
+      }
+    }
+
+    // TODO: Extend this check to other numeric literals
+    this.triggerAsync("warning", {
+      code: "W045",
+      line: this.line,
+      character: this.char + value.length,
+      data: [ value ]
+    }, checks, function() { return !isFinite(value); });
+
+    return {
+      type: Token.NumericLiteral,
+      value: value,
+      base: base,
+      isNonOctal: isNonOctal,
+      isMalformed: false
+    };
+  },
+
+
+  // Assumes previously parsed character was \ (=== '\\') and was not skipped.
+  scanEscapeSequence: function(checks) {
+    var allowNewLine = false;
+    var jump = 1;
+    this.skip();
+    var char = this.peek();
+
+    switch (char) {
+    case "'":
+      this.triggerAsync("warning", {
+        code: "W114",
+        line: this.line,
+        character: this.char,
+        data: [ "\\'" ]
+      }, checks, function() {return state.jsonMode; });
+      break;
+    case "b":
+      char = "\\b";
+      break;
+    case "f":
+      char = "\\f";
+      break;
+    case "n":
+      char = "\\n";
+      break;
+    case "r":
+      char = "\\r";
+      break;
+    case "t":
+      char = "\\t";
+      break;
+    case "0":
+      char = "\\0";
+
+      // Octal literals fail in strict mode.
+      // Check if the number is between 00 and 07.
+      var n = parseInt(this.peek(1), 10);
+      this.triggerAsync("warning", {
+        code: "W115",
+        line: this.line,
+        character: this.char
+      }, checks,
+      function() { return n >= 0 && n <= 7 && state.isStrict(); });
+      break;
+    case "1":
+    case "2":
+    case "3":
+    case "4":
+    case "5":
+    case "6":
+    case "7":
+      char = "\\" + char;
+      this.triggerAsync("warning", {
+        code: "W115",
+        line: this.line,
+        character: this.char
+      }, checks,
+      function() { return state.isStrict(); });
+      break;
+    case "u":
+      var sequence = this.input.substr(1, 4);
+      var code = parseInt(sequence, 16);
+      if (!isHex(sequence)) {
+        // This condition unequivocally describes a syntax error.
+        // TODO: Re-factor as an "error" (not a "warning").
+        this.trigger("warning", {
+          code: "W052",
+          line: this.line,
+          character: this.char,
+          data: [ "u" + sequence ]
+        });
+      }
+      char = String.fromCharCode(code);
+      jump = 5;
+      break;
+    case "v":
+      this.triggerAsync("warning", {
+        code: "W114",
+        line: this.line,
+        character: this.char,
+        data: [ "\\v" ]
+      }, checks, function() { return state.jsonMode; });
+
+      char = "\v";
+      break;
+    case "x":
+      var  x = parseInt(this.input.substr(1, 2), 16);
+
+      this.triggerAsync("warning", {
+        code: "W114",
+        line: this.line,
+        character: this.char,
+        data: [ "\\x-" ]
+      }, checks, function() { return state.jsonMode; });
+
+      char = String.fromCharCode(x);
+      jump = 3;
+      break;
+    case "\\":
+      char = "\\\\";
+      break;
+    case "\"":
+      char = "\\\"";
+      break;
+    case "/":
+      break;
+    case "":
+      allowNewLine = true;
+      char = "";
+      break;
+    }
+
+    return { char: char, jump: jump, allowNewLine: allowNewLine };
+  },
+
+  /*
+   * Extract a template literal out of the next sequence of characters
+   * and/or lines or return 'null' if its not possible. Since template
+   * literals can span across multiple lines, this method has to move
+   * the char pointer.
+   */
+  scanTemplateLiteral: function(checks) {
+    var tokenType;
+    var value = "";
+    var ch;
+    var startLine = this.line;
+    var startChar = this.char;
+    var depth = this.templateStarts.length;
+
+    if (this.peek() === "`") {
+      if (!state.inES6(true)) {
+        this.triggerAsync(
+          "warning",
+          {
+            code: "W119",
+            line: this.line,
+            character: this.char,
+            data: ["template literal syntax", "6"]
+          },
+          checks,
+          function() { return true; }
+        );
+      }
+      // Template must start with a backtick.
+      tokenType = Token.TemplateHead;
+      this.templateStarts.push({ line: this.line, char: this.char });
+      depth = this.templateStarts.length;
+      this.skip(1);
+      this.pushContext(Context.Template);
+    } else if (this.inContext(Context.Template) && this.peek() === "}") {
+      // If we're in a template context, and we have a '}', lex a TemplateMiddle.
+      tokenType = Token.TemplateMiddle;
+    } else {
+      // Go lex something else.
+      return null;
+    }
+
+    while (this.peek() !== "`") {
+      while ((ch = this.peek()) === "") {
+        value += "\n";
+        if (!this.nextLine(checks)) {
+          // Unclosed template literal --- point to the starting "`"
+          var startPos = this.templateStarts.pop();
+          this.trigger("error", {
+            code: "E052",
+            line: startPos.line,
+            character: startPos.char
+          });
+          return {
+            type: tokenType,
+            value: value,
+            startLine: startLine,
+            startChar: startChar,
+            isUnclosed: true,
+            depth: depth,
+            context: this.popContext()
+          };
+        }
+      }
+
+      if (ch === '$' && this.peek(1) === '{') {
+        value += '${';
+        this.skip(2);
+        return {
+          type: tokenType,
+          value: value,
+          startLine: startLine,
+          startChar: startChar,
+          isUnclosed: false,
+          depth: depth,
+          context: this.currentContext()
+        };
+      } else if (ch === '\\') {
+        var escape = this.scanEscapeSequence(checks);
+        value += escape.char;
+        this.skip(escape.jump);
+      } else if (ch !== '`') {
+        // Otherwise, append the value and continue.
+        value += ch;
+        this.skip(1);
+      }
+    }
+
+    // Final value is either NoSubstTemplate or TemplateTail
+    tokenType = tokenType === Token.TemplateHead ? Token.NoSubstTemplate : Token.TemplateTail;
+    this.skip(1);
+    this.templateStarts.pop();
+
+    return {
+      type: tokenType,
+      value: value,
+      startLine: startLine,
+      startChar: startChar,
+      isUnclosed: false,
+      depth: depth,
+      context: this.popContext()
+    };
+  },
+
+  /*
+   * Extract a string out of the next sequence of characters and/or
+   * lines or return 'null' if its not possible. Since strings can
+   * span across multiple lines this method has to move the char
+   * pointer.
+   *
+   * This method recognizes pseudo-multiline JavaScript strings:
+   *
+   *   var str = "hello\
+   *   world";
+   */
+  scanStringLiteral: function(checks) {
+    /*jshint loopfunc:true */
+    var quote = this.peek();
+
+    // String must start with a quote.
+    if (quote !== "\"" && quote !== "'") {
+      return null;
+    }
+
+    // In JSON strings must always use double quotes.
+    this.triggerAsync("warning", {
+      code: "W108",
+      line: this.line,
+      character: this.char // +1?
+    }, checks, function() { return state.jsonMode && quote !== "\""; });
+
+    var value = "";
+    var startLine = this.line;
+    var startChar = this.char;
+    var allowNewLine = false;
+
+    this.skip();
+
+    while (this.peek() !== quote) {
+      if (this.peek() === "") { // End Of Line
+
+        // If an EOL is not preceded by a backslash, show a warning
+        // and proceed like it was a legit multi-line string where
+        // author simply forgot to escape the newline symbol.
+        //
+        // Another approach is to implicitly close a string on EOL
+        // but it generates too many false positives.
+
+        if (!allowNewLine) {
+          // This condition unequivocally describes a syntax error.
+          // TODO: Emit error E029 and remove W112.
+          this.trigger("warning", {
+            code: "W112",
+            line: this.line,
+            character: this.char
+          });
+        } else {
+          allowNewLine = false;
+
+          // Otherwise show a warning if multistr option was not set.
+          // For JSON, show warning no matter what.
+
+          this.triggerAsync("warning", {
+            code: "W043",
+            line: this.line,
+            character: this.char
+          }, checks, function() { return !state.option.multistr; });
+
+          this.triggerAsync("warning", {
+            code: "W042",
+            line: this.line,
+            character: this.char
+          }, checks, function() { return state.jsonMode && state.option.multistr; });
+        }
+
+        // If we get an EOF inside of an unclosed string, show an
+        // error and implicitly close it at the EOF point.
+
+        if (!this.nextLine(checks)) {
+          return {
+            type: Token.StringLiteral,
+            value: value,
+            startLine: startLine,
+            startChar: startChar,
+            isUnclosed: true,
+            quote: quote
+          };
+        }
+
+      } else { // Any character other than End Of Line
+
+        allowNewLine = false;
+        var char = this.peek();
+        var jump = 1; // A length of a jump, after we're done
+                      // parsing this character.
+
+        if (char < " ") {
+          // Warn about a control character in a string.
+          this.triggerAsync(
+            "warning",
+            {
+              code: "W113",
+              line: this.line,
+              character: this.char,
+              data: [ "<non-printable>" ]
+            },
+            checks,
+            function() { return true; }
+          );
+        }
+
+        // Special treatment for some escaped characters.
+        if (char === "\\") {
+          var parsed = this.scanEscapeSequence(checks);
+          char = parsed.char;
+          jump = parsed.jump;
+          allowNewLine = parsed.allowNewLine;
+        }
+
+        // If char is the empty string, end of the line has been reached. In
+        // this case, `this.char` should not be incremented so that warnings
+        // and errors reported in the subsequent loop iteration have the
+        // correct character column offset.
+        if (char !== "") {
+          value += char;
+          this.skip(jump);
+        }
+      }
+    }
+
+    this.skip();
+    return {
+      type: Token.StringLiteral,
+      value: value,
+      startLine: startLine,
+      startChar: startChar,
+      isUnclosed: false,
+      quote: quote
+    };
+  },
+
+  /*
+   * Extract a regular expression out of the next sequence of
+   * characters and/or lines or return 'null' if its not possible.
+   *
+   * This method is platform dependent: it accepts almost any
+   * regular expression values but then tries to compile and run
+   * them using system's RegExp object. This means that there are
+   * rare edge cases where one JavaScript engine complains about
+   * your regular expression while others don't.
+   */
+  scanRegExp: function(checks) {
+    var index = 0;
+    var length = this.input.length;
+    var char = this.peek();
+    var value = char;
+    var body = "";
+    var groupReferences = [];
+    var allFlags = "";
+    var es5Flags = "";
+    var malformed = false;
+    var isCharSet = false;
+    var isCharSetRange = false;
+    var isGroup = false;
+    var isQuantifiable = false;
+    var hasInvalidQuantifier = false;
+    var escapedChars = "";
+    var hasUFlag = function() { return allFlags.indexOf("u") > -1; };
+    var escapeSequence;
+    var groupCount = 0;
+    var terminated, malformedDesc;
+
+    var scanRegexpEscapeSequence = function() {
+      var next, sequence;
+      index += 1;
+      char = this.peek(index);
+
+      if (reg.nonzeroDigit.test(char)) {
+        sequence = char;
+        next = this.peek(index + 1);
+        while (reg.nonzeroDigit.test(next) || next === "0") {
+          index += 1;
+          char = next;
+          sequence += char;
+          body += char;
+          value += char;
+          next = this.peek(index + 1);
+        }
+        groupReferences.push(Number(sequence));
+        return sequence;
+      }
+
+      escapedChars += char;
+
+      if (char === "u" && this.peek(index + 1) === "{") {
+        var x = index + 2;
+        sequence = "u{";
+        next = this.peek(x);
+        while (isHex(next)) {
+          sequence += next;
+          x += 1;
+          next = this.peek(x);
+        }
+
+        if (next !== "}") {
+          this.triggerAsync(
+            "error",
+            {
+              code: "E016",
+              line: this.line,
+              character: this.char,
+              data: [ "Invalid Unicode escape sequence" ]
+            },
+            checks,
+            hasUFlag
+          );
+        } else if (sequence.length > 2) {
+          sequence += "}";
+          body += sequence;
+          value += sequence;
+          index = x + 1;
+          return sequence;
+        }
+      }
+
+      // Unexpected control character
+      if (char < " ") {
+        malformed = true;
+        this.triggerAsync(
+          "warning",
+          {
+            code: "W048",
+            line: this.line,
+            character: this.char
+          },
+          checks,
+          function() { return true; }
+        );
+      }
+
+      // Unexpected escaped character
+      if (char === "<") {
+        malformed = true;
+        this.triggerAsync(
+          "warning",
+          {
+            code: "W049",
+            line: this.line,
+            character: this.char,
+            data: [ char ]
+          },
+          checks,
+          function() { return true; }
+        );
+      } else if (char === "0" && reg.decimalDigit.test(this.peek(index + 1))) {
+        this.triggerAsync(
+          "error",
+          {
+            code: "E016",
+            line: this.line,
+            character: this.char,
+            data: [ "Invalid decimal escape sequence" ]
+          },
+          checks,
+          hasUFlag
+        );
+      }
+
+      index += 1;
+      body += char;
+      value += char;
+
+      return char;
+    }.bind(this);
+
+    var checkQuantifier = function() {
+      var lookahead = index;
+      var lowerBound = "";
+      var upperBound = "";
+      var next;
+
+      next = this.peek(lookahead + 1);
+
+      while (reg.decimalDigit.test(next)) {
+        lookahead += 1;
+        lowerBound += next;
+        next = this.peek(lookahead + 1);
+      }
+
+      if (!lowerBound) {
+        return false;
+      }
+
+      if (next === "}") {
+        return true;
+      }
+
+      if (next !== ",") {
+        return false;
+      }
+
+      lookahead += 1;
+      next = this.peek(lookahead + 1);
+
+      while (reg.decimalDigit.test(next)) {
+        lookahead += 1;
+        upperBound += next;
+        next = this.peek(lookahead + 1);
+      }
+
+      if (next !== "}") {
+        return false;
+      }
+
+      if (upperBound) {
+        return Number(lowerBound) <= Number(upperBound);
+      }
+
+      return true;
+    }.bind(this);
+
+    var translateUFlag = function(body) {
+      // The BMP character to use as a replacement for astral symbols when
+      // translating an ES6 "u"-flagged pattern to an ES5-compatible
+      // approximation.
+      // Note: replacing with '\uFFFF' enables false positives in unlikely
+      // scenarios. For example, `[\u{1044f}-\u{10440}]` is an invalid pattern
+      // that would not be detected by this substitution.
+      var astralSubstitute = "\uFFFF";
+
+      return body
+        // Replace every Unicode escape sequence with the equivalent BMP
+        // character or a constant ASCII code point in the case of astral
+        // symbols. (See the above note on `astralSubstitute` for more
+        // information.)
+        .replace(/\\u\{([0-9a-fA-F]+)\}|\\u([a-fA-F0-9]{4})/g, function($0, $1, $2) {
+          var codePoint = parseInt($1 || $2, 16);
+          var literal;
+
+          if (codePoint > 0x10FFFF) {
+            malformed = true;
+            this.trigger("error", {
+              code: "E016",
+              line: this.line,
+              character: this.char,
+              data: [ char ]
+            });
+
+            return;
+          }
+          literal = String.fromCharCode(codePoint);
+
+          if (reg.regexpSyntaxChars.test(literal)) {
+            return $0;
+          }
+
+          if (codePoint <= 0xFFFF) {
+            return String.fromCharCode(codePoint);
+          }
+          return astralSubstitute;
+        }.bind(this))
+        // Replace each paired surrogate with a single ASCII symbol to avoid
+        // throwing on regular expressions that are only valid in combination
+        // with the "u" flag.
+        .replace(
+          /[\uD800-\uDBFF][\uDC00-\uDFFF]/g,
+          astralSubstitute
+        );
+    }.bind(this);
+
+    // Regular expressions must start with '/'
+    if (!this.prereg || char !== "/") {
+      return null;
+    }
+
+    index += 1;
+    terminated = false;
+
+    // Try to get everything in between slashes. A couple of
+    // cases aside (see scanRegexpEscapeSequence) we don't really
+    // care whether the resulting expression is valid or not.
+    // We will check that later using the RegExp object.
+
+    while (index < length) {
+      // Because an iteration of this loop may terminate in a number of
+      // distinct locations, `isCharSetRange` is re-set at the onset of
+      // iteration.
+      isCharSetRange &= char === "-";
+      char = this.peek(index);
+      value += char;
+      body += char;
+
+      if (isCharSet) {
+        if (char === "]") {
+          if (this.peek(index - 1) !== "\\" || this.peek(index - 2) === "\\") {
+            isCharSet = false;
+          }
+        } else if (char === "-") {
+          isCharSetRange = true;
+        }
+      }
+
+      if (char === "\\") {
+        escapeSequence = scanRegexpEscapeSequence();
+
+        if (isCharSet && (this.peek(index) === "-" || isCharSetRange) &&
+          reg.regexpCharClasses.test(escapeSequence)) {
+          this.triggerAsync(
+            "error",
+            {
+              code: "E016",
+              line: this.line,
+              character: this.char,
+              data: [ "Character class used in range" ]
+            },
+            checks,
+            hasUFlag
+          );
+        }
+
+        continue;
+      }
+
+      if (isCharSet) {
+        index += 1;
+        continue;
+      }
+
+      if (char === "{" && !hasInvalidQuantifier) {
+        hasInvalidQuantifier = !checkQuantifier();
+      }
+
+      if (char === "[") {
+        isCharSet = true;
+        index += 1;
+        continue;
+      } else if (char === "(") {
+        isGroup = true;
+
+        if (this.peek(index + 1) === "?" &&
+          (this.peek(index + 2) === "=" || this.peek(index + 2) === "!")) {
+          isQuantifiable = true;
+        }
+      } else if (char === ")") {
+        if (isQuantifiable) {
+          isQuantifiable = false;
+
+          if (reg.regexpQuantifiers.test(this.peek(index + 1))) {
+            this.triggerAsync(
+              "error",
+              {
+                code: "E016",
+                line: this.line,
+                character: this.char,
+                data: [ "Quantified quantifiable" ]
+              },
+              checks,
+              hasUFlag
+            );
+          }
+        } else {
+          groupCount += 1;
+        }
+
+        isGroup = false;
+      } else if (char === "/") {
+        body = body.substr(0, body.length - 1);
+        terminated = true;
+        index += 1;
+        break;
+      }
+
+      index += 1;
+    }
+
+    // A regular expression that was never closed is an
+    // error from which we cannot recover.
+
+    if (!terminated) {
+      this.trigger("error", {
+        code: "E015",
+        line: this.line,
+        character: this.from
+      });
+
+      return void this.trigger("fatal", {
+        line: this.line,
+        from: this.from
+      });
+    }
+
+    // Parse flags (if any).
+
+    while (index < length) {
+      char = this.peek(index);
+      if (!/[gimyus]/.test(char)) {
+        break;
+      }
+      if (char === "y") {
+        if (!state.inES6(true)) {
+          this.triggerAsync(
+            "warning",
+            {
+              code: "W119",
+              line: this.line,
+              character: this.char,
+              data: [ "Sticky RegExp flag", "6" ]
+            },
+            checks,
+            function() { return true; }
+          );
+        }
+      } else if (char === "u") {
+        if (!state.inES6(true)) {
+          this.triggerAsync(
+            "warning",
+            {
+              code: "W119",
+              line: this.line,
+              character: this.char,
+              data: [ "Unicode RegExp flag", "6" ]
+            },
+            checks,
+            function() { return true; }
+          );
+        }
+
+        var hasInvalidEscape = (function(groupReferences, groupCount, escapedChars, reg) {
+          var hasInvalidGroup = groupReferences.some(function(groupReference) {
+            if (groupReference > groupCount) {
+              return true;
+            }
+          });
+
+          if (hasInvalidGroup) {
+            return true;
+          }
+
+          return !escapedChars.split("").every(function(escapedChar) {
+              return escapedChar === "u" ||
+                escapedChar === "/" ||
+                escapedChar === "0" ||
+                reg.regexpControlEscapes.test(escapedChar) ||
+                reg.regexpCharClasses.test(escapedChar) ||
+                reg.regexpSyntaxChars.test(escapedChar);
+            });
+        }(groupReferences, groupCount, escapedChars, reg));
+
+        if (hasInvalidEscape) {
+          malformedDesc = "Invalid escape";
+        } else if (hasInvalidQuantifier) {
+          malformedDesc = "Invalid quantifier";
+        }
+
+        body = translateUFlag(body);
+      } else if (char === "s") {
+        if (!state.inES9()) {
+          this.triggerAsync(
+            "warning",
+            {
+              code: "W119",
+              line: this.line,
+              character: this.char,
+              data: [ "DotAll RegExp flag", "9" ]
+            },
+            checks,
+            function() { return true; }
+          );
+        }
+        if (value.indexOf("s") > -1) {
+          malformedDesc = "Duplicate RegExp flag";
+        }
+      } else {
+        es5Flags += char;
+      }
+
+      if (allFlags.indexOf(char) > -1) {
+        malformedDesc = "Duplicate RegExp flag";
+      }
+      allFlags += char;
+
+      value += char;
+      allFlags += char;
+      index += 1;
+    }
+
+    if (allFlags.indexOf("u") === -1) {
+      this.triggerAsync("warning", {
+        code: "W147",
+        line: this.line,
+        character: this.char
+      }, checks, function() { return state.option.regexpu; });
+    }
+
+    // Check regular expression for correctness.
+
+    try {
+      new RegExp(body, es5Flags);
+    } catch (err) {
+      /**
+       * Because JSHint relies on the current engine's RegExp parser to
+       * validate RegExp literals, the description (exposed as the "data"
+       * property on the error object) is platform dependent.
+       */
+      malformedDesc = err.message;
+    }
+
+    if (malformedDesc) {
+      malformed = true;
+      this.trigger("error", {
+        code: "E016",
+        line: this.line,
+        character: this.char,
+        data: [ malformedDesc ]
+      });
+    } else if (allFlags.indexOf("s") > -1 && !reg.regexpDot.test(body)) {
+      this.trigger("warning", {
+        code: "W148",
+        line: this.line,
+        character: this.char
+      });
+    }
+
+    return {
+      type: Token.RegExp,
+      value: value,
+      isMalformed: malformed
+    };
+  },
+
+  /*
+   * Scan for any occurrence of non-breaking spaces. Non-breaking spaces
+   * can be mistakenly typed on OS X with option-space. Non UTF-8 web
+   * pages with non-breaking pages produce syntax errors.
+   */
+  scanNonBreakingSpaces: function() {
+    return state.option.nonbsp ?
+      this.input.search(/(\u00A0)/) : -1;
+  },
+
+  /*
+   * Produce the next raw token or return 'null' if no tokens can be matched.
+   * This method skips over all space characters.
+   */
+  next: function(checks) {
+    this.from = this.char;
+
+    // Move to the next non-space character.
+    while (reg.whitespace.test(this.peek())) {
+      this.from += 1;
+      this.skip();
+    }
+
+    // Methods that work with multi-line structures and move the
+    // character pointer.
+
+    var match = this.scanComments(checks) ||
+      this.scanStringLiteral(checks) ||
+      this.scanTemplateLiteral(checks);
+
+    if (match) {
+      return match;
+    }
+
+    // Methods that don't move the character pointer.
+
+    match =
+      this.scanRegExp(checks) ||
+      this.scanPunctuator() ||
+      this.scanKeyword() ||
+      this.scanIdentifier(checks) ||
+      this.scanNumericLiteral(checks);
+
+    if (match) {
+      this.skip(match.tokenLength || match.value.length);
+      return match;
+    }
+
+    // No token could be matched, give up.
+
+    return null;
+  },
+
+  /*
+   * Switch to the next line and reset all char pointers. Once
+   * switched, this method also checks for other minor warnings.
+   */
+  nextLine: function(checks) {
+    var char;
+
+    if (this.line >= this.getLines().length) {
+      return false;
+    }
+
+    this.input = this.getLines()[this.line];
+    this.line += 1;
+    this.char = 1;
+    this.from = 1;
+
+    var inputTrimmed = this.input.trim();
+
+    var startsWith = function() {
+      return _.some(arguments, function(prefix) {
+        return inputTrimmed.indexOf(prefix) === 0;
+      });
+    };
+
+    var endsWith = function() {
+      return _.some(arguments, function(suffix) {
+        return inputTrimmed.indexOf(suffix, inputTrimmed.length - suffix.length) !== -1;
+      });
+    };
+
+    // If we are ignoring linter errors, replace the input with empty string
+    // if it doesn't already at least start or end a multi-line comment
+    if (this.ignoringLinterErrors === true) {
+      if (!startsWith("/*", "//") && !(this.inComment && endsWith("*/"))) {
+        this.input = "";
+      }
+    }
+
+    char = this.scanNonBreakingSpaces();
+    if (char >= 0) {
+      this.triggerAsync(
+        "warning",
+        { code: "W125", line: this.line, character: char + 1 },
+        checks,
+        function() { return true; }
+      );
+    }
+
+    this.input = this.input.replace(/\t/g, state.tab);
+
+    // If there is a limit on line length, warn when lines get too
+    // long.
+
+    if (!this.ignoringLinterErrors && state.option.maxlen &&
+      state.option.maxlen < this.input.length) {
+      var inComment = this.inComment ||
+        startsWith.call(inputTrimmed, "//") ||
+        startsWith.call(inputTrimmed, "/*");
+
+      var shouldTriggerError = !inComment || !reg.maxlenException.test(inputTrimmed);
+
+      if (shouldTriggerError) {
+        this.triggerAsync(
+          "warning",
+          { code: "W101", line: this.line, character: this.input.length },
+          checks,
+          function() { return true; }
+        );
+      }
+    }
+
+    return true;
+  },
+
+  /*
+   * Produce the next token. This function is called by advance() to get
+   * the next token. It returns a token in a JSLint-compatible format.
+   */
+  token: function() {
+    /*jshint loopfunc:true */
+    var checks = asyncTrigger();
+    var token;
+
+    // Produce a token object.
+    var create = function(type, value, isProperty, token) {
+      /*jshint validthis:true */
+      var obj;
+
+      if (type !== "(endline)" && type !== "(end)") {
+        this.prereg = false;
+      }
+
+      if (type === "(punctuator)") {
+        switch (value) {
+        case ".":
+        case ")":
+        case "~":
+        case "#":
+        case "]":
+        case "}":
+        case "++":
+        case "--":
+          this.prereg = false;
+          break;
+        default:
+          this.prereg = true;
+        }
+
+        obj = Object.create(state.syntax[value] || state.syntax["(error)"]);
+      }
+
+      if (type === "(identifier)") {
+        if (value === "return" || value === "case" || value === "yield" ||
+            value === "typeof" || value === "instanceof" || value === "void" ||
+            value === "await" || value === "new" || value === "delete" ||
+            value === "default" || value === "extends") {
+          this.prereg = true;
+        }
+
+        if (_.has(state.syntax, value)) {
+          obj = Object.create(state.syntax[value] || state.syntax["(error)"]);
+        }
+      }
+
+      if (type === "(template)" || type === "(template middle)") {
+        this.prereg = true;
+      }
+
+      if (!obj) {
+        obj = Object.create(state.syntax[type]);
+      }
+
+      obj.identifier = (type === "(identifier)");
+      obj.type = obj.type || type;
+      obj.value = value;
+      obj.line = this.line;
+      obj.character = this.char;
+      obj.from = this.from;
+      if (obj.identifier && token) obj.raw_text = token.text || token.value;
+      if (token && token.startLine && token.startLine !== this.line) {
+        obj.startLine = token.startLine;
+      }
+      if (token && token.context) {
+        // Context of current token
+        obj.context = token.context;
+      }
+      if (token && token.depth) {
+        // Nested template depth
+        obj.depth = token.depth;
+      }
+      if (token && token.isUnclosed) {
+        // Mark token as unclosed string / template literal
+        obj.isUnclosed = token.isUnclosed;
+      }
+
+      if (isProperty && obj.identifier) {
+        obj.isProperty = isProperty;
+      }
+
+      obj.check = checks.check;
+
+      return obj;
+    }.bind(this);
+
+    for (;;) {
+      if (!this.input.length) {
+        if (this.nextLine(checks)) {
+          return create("(endline)", "");
+        }
+
+        if (this.exhausted) {
+          return null;
+        }
+
+        this.exhausted = true;
+        return create("(end)", "");
+      }
+
+      token = this.next(checks);
+
+      if (!token) {
+        if (this.input.length) {
+          // Unexpected character.
+          this.trigger("error", {
+            code: "E024",
+            line: this.line,
+            character: this.char,
+            data: [ this.peek() ]
+          });
+
+          this.input = "";
+        }
+
+        continue;
+      }
+
+      switch (token.type) {
+      case Token.StringLiteral:
+        this.triggerAsync("String", {
+          line: this.line,
+          char: this.char,
+          from: this.from,
+          startLine: token.startLine,
+          startChar: token.startChar,
+          value: token.value,
+          quote: token.quote
+        }, checks, function() { return true; });
+
+        return create("(string)", token.value, null, token);
+
+      case Token.TemplateHead:
+        this.trigger("TemplateHead", {
+          line: this.line,
+          char: this.char,
+          from: this.from,
+          startLine: token.startLine,
+          startChar: token.startChar,
+          value: token.value
+        });
+        return create("(template)", token.value, null, token);
+
+      case Token.TemplateMiddle:
+        this.trigger("TemplateMiddle", {
+          line: this.line,
+          char: this.char,
+          from: this.from,
+          startLine: token.startLine,
+          startChar: token.startChar,
+          value: token.value
+        });
+        return create("(template middle)", token.value, null, token);
+
+      case Token.TemplateTail:
+        this.trigger("TemplateTail", {
+          line: this.line,
+          char: this.char,
+          from: this.from,
+          startLine: token.startLine,
+          startChar: token.startChar,
+          value: token.value
+        });
+        return create("(template tail)", token.value, null, token);
+
+      case Token.NoSubstTemplate:
+        this.trigger("NoSubstTemplate", {
+          line: this.line,
+          char: this.char,
+          from: this.from,
+          startLine: token.startLine,
+          startChar: token.startChar,
+          value: token.value
+        });
+        return create("(no subst template)", token.value, null, token);
+
+      case Token.Identifier:
+        this.triggerAsync("Identifier", {
+          line: this.line,
+          char: this.char,
+          from: this.from,
+          name: token.value,
+          raw_name: token.text,
+          isProperty: state.tokens.curr.id === "."
+        }, checks, function() { return true; });
+
+        /* falls through */
+      case Token.Keyword:
+        return create("(identifier)", token.value, state.tokens.curr.id === ".", token);
+
+      case Token.NumericLiteral:
+        if (token.isMalformed) {
+          this.trigger("error", {
+            code: "E067",
+            line: this.line,
+            character: this.char,
+            data: [ token.value ]
+          });
+        }
+
+        this.triggerAsync("warning", {
+          code: "W114",
+          line: this.line,
+          character: this.char,
+          data: [ "0x-" ]
+        }, checks, function() { return token.base === 16 && state.jsonMode; });
+
+        this.triggerAsync("warning", {
+          code: "W115",
+          line: this.line,
+          character: this.char
+        }, checks, function() {
+          return state.isStrict() && token.base === 8 && token.isLegacy;
+        });
+
+        this.triggerAsync("error", {
+          code: "E068",
+          line: this.line,
+          character: this.char
+        }, checks, function() {
+          return state.isStrict() && token.isNonOctal;
+        });
+
+        this.trigger("Number", {
+          line: this.line,
+          char: this.char,
+          from: this.from,
+          value: token.value,
+          base: token.base,
+          isMalformed: token.isMalformed
+        });
+
+        return create("(number)", token.value);
+
+      case Token.RegExp:
+        return create("(regexp)", token.value);
+
+      case Token.Comment:
+        if (token.isSpecial) {
+          return {
+            id: '(comment)',
+            value: token.value,
+            body: token.body,
+            type: token.commentType,
+            isSpecial: token.isSpecial,
+            line: this.line,
+            character: this.char,
+            from: this.from
+          };
+        }
+
+        break;
+
+      default:
+        return create("(punctuator)", token.value);
+      }
+    }
+  }
+};
+
+exports.Lexer = Lexer;
+exports.Context = Context;
+
+},{"../data/ascii-identifier-data.js":1,"../data/es5-identifier-names.js":2,"../data/non-ascii-identifier-part-only.js":3,"../data/non-ascii-identifier-start.js":4,"./reg.js":22,"./state.js":24,"events":9,"lodash":16}],18:[function(require,module,exports){
+"use strict";
+
+var _ = require("lodash");
+
+var errors = {
+  // JSHint options
+  E001: "Bad {a}option: '{b}'.",
+  E002: "Bad option value.",
+
+  // JSHint input
+  E003: "Expected a JSON value.",
+  E004: "Input is neither a string nor an array of strings.",
+  E005: "Input is empty.",
+  E006: "Unexpected early end of program.",
+
+  // Strict mode
+  E007: "Missing \"use strict\" statement.",
+  E008: "Strict violation.",
+  E009: "Option 'validthis' can't be used in a global scope.",
+  E010: "'with' is not allowed in strict mode.",
+
+  // Constants
+  E011: "'{a}' has already been declared.",
+  E012: "const '{a}' is initialized to 'undefined'.",
+  E013: "Attempting to override '{a}' which is a constant.",
+
+  // Regular expressions
+  E014: "A regular expression literal can be confused with '/='.",
+  E015: "Unclosed regular expression.",
+  E016: "Invalid regular expression.",
+
+  // Tokens
+  E017: "Unclosed comment.",
+  E018: "Unbegun comment.",
+  E019: "Unmatched '{a}'.",
+  E020: "Expected '{a}' to match '{b}' from line {c} and instead saw '{d}'.",
+  E021: "Expected '{a}' and instead saw '{b}'.",
+  E022: "Line breaking error '{a}'.",
+  E023: "Missing '{a}'.",
+  E024: "Unexpected '{a}'.",
+  E025: "Missing ':' on a case clause.",
+  E026: "Missing '}' to match '{' from line {a}.",
+  E027: "Missing ']' to match '[' from line {a}.",
+  E028: "Illegal comma.",
+  E029: "Unclosed string.",
+
+  // Everything else
+  E030: "Expected an identifier and instead saw '{a}'.",
+  E031: "Bad assignment.", // FIXME: Rephrase
+  E032: "Expected a small integer or 'false' and instead saw '{a}'.",
+  E033: "Expected an operator and instead saw '{a}'.",
+  E034: "get/set are ES5 features.",
+  E035: "Missing property name.",
+  E036: "Expected to see a statement and instead saw a block.",
+  E037: null,
+  E038: null,
+  E039: "Function declarations are not invocable. Wrap the whole function invocation in parens.",
+  E040: "Each value should have its own case label.",
+  E041: "Unrecoverable syntax error.",
+  E042: "Stopping.",
+  E043: "Too many errors.",
+  E044: null,
+  E045: "Invalid for each loop.",
+  E046: "Yield expressions may only occur within generator functions.",
+  E047: null,
+  E048: "{a} declaration not directly within block.",
+  E049: "A {a} cannot be named '{b}'.",
+  E050: "Mozilla requires the yield expression to be parenthesized here.",
+  E051: null,
+  E052: "Unclosed template literal.",
+  E053: "{a} declarations are only allowed at the top level of module scope.",
+  E054: "Class properties must be methods. Expected '(' but instead saw '{a}'.",
+  E055: "The '{a}' option cannot be set after any executable code.",
+  E056: "'{a}' was used before it was declared, which is illegal for '{b}' variables.",
+  E057: "Invalid meta property: '{a}.{b}'.",
+  E058: "Missing semicolon.",
+  E059: "Incompatible values for the '{a}' and '{b}' linting options.",
+  E060: "Non-callable values cannot be used as the second operand to instanceof.",
+  E061: "Invalid position for 'yield' expression (consider wrapping in parenthesis).",
+  E062: "Rest parameter does not a support default value.",
+  E063: "Super property may only be used within method bodies.",
+  E064: "Super call may only be used within class method bodies.",
+  E065: "Functions defined outside of strict mode with non-simple parameter lists may not " +
+    "enable strict mode.",
+  E066: "Asynchronous iteration is only available with for-of loops.",
+  E067: "Malformed numeric literal: '{a}'.",
+  E068: "Decimals with leading zeros are not allowed in strict mode."
+};
+
+var warnings = {
+  W001: "'hasOwnProperty' is a really bad name.",
+  W002: "Value of '{a}' may be overwritten in IE 8 and earlier.",
+  W003: "'{a}' was used before it was defined.",
+  W004: "'{a}' is already defined.",
+  W005: "A dot following a number can be confused with a decimal point.",
+  W006: "Confusing minuses.",
+  W007: "Confusing plusses.",
+  W008: "A leading decimal point can be confused with a dot: '{a}'.",
+  W009: "The array literal notation [] is preferable.",
+  W010: "The object literal notation {} is preferable.",
+  W011: null,
+  W012: null,
+  W013: null,
+  W014: "Misleading line break before '{a}'; readers may interpret this as an expression boundary.",
+  W015: null,
+  W016: "Unexpected use of '{a}'.",
+  W017: "Bad operand.",
+  W018: "Confusing use of '{a}'.",
+  W019: "Use the isNaN function to compare with NaN.",
+  W020: "Read only.",
+  W021: "Reassignment of '{a}', which is a {b}. " +
+    "Use 'var' or 'let' to declare bindings that may change.",
+  W022: "Do not assign to the exception parameter.",
+  W023: null,
+  W024: "Expected an identifier and instead saw '{a}' (a reserved word).",
+  W025: "Missing name in function declaration.",
+  W026: "Inner functions should be listed at the top of the outer function.",
+  W027: "Unreachable '{a}' after '{b}'.",
+  W028: "Label '{a}' on {b} statement.",
+  W030: "Expected an assignment or function call and instead saw an expression.",
+  W031: "Do not use 'new' for side effects.",
+  W032: "Unnecessary semicolon.",
+  W033: "Missing semicolon.",
+  W034: "Unnecessary directive \"{a}\".",
+  W035: "Empty block.",
+  W036: "Unexpected /*member '{a}'.",
+  W037: "'{a}' is a statement label.",
+  W038: "'{a}' used out of scope.",
+  W039: null,
+  W040: "If a strict mode function is executed using function invocation, " +
+    "its 'this' value will be undefined.",
+  W041: null,
+  W042: "Avoid EOL escaping.",
+  W043: "Bad escaping of EOL. Use option multistr if needed.",
+  W044: "Bad or unnecessary escaping.", /* TODO(caitp): remove W044 */
+  W045: "Value described by numeric literal cannot be accurately " +
+    "represented with a number value: '{a}'.",
+  W046: "Don't use extra leading zeros '{a}'.",
+  W047: "A trailing decimal point can be confused with a dot: '{a}'.",
+  W048: "Unexpected control character in regular expression.",
+  W049: "Unexpected escaped character '{a}' in regular expression.",
+  W050: "JavaScript URL.",
+  W051: "Variables should not be deleted.",
+  W052: "Unexpected '{a}'.",
+  W053: "Do not use {a} as a constructor.",
+  W054: "The Function constructor is a form of eval.",
+  W055: "A constructor name should start with an uppercase letter.",
+  W056: "Bad constructor.",
+  W057: "Weird construction. Is 'new' necessary?",
+  W058: "Missing '()' invoking a constructor.",
+  W059: "Avoid arguments.{a}.",
+  W060: "document.write can be a form of eval.",
+  W061: "eval can be harmful.",
+  W062: "Wrap an immediate function invocation in parens " +
+    "to assist the reader in understanding that the expression " +
+    "is the result of a function, and not the function itself.",
+  W063: "Math is not a function.",
+  W064: "Missing 'new' prefix when invoking a constructor.",
+  W065: "Missing radix parameter.",
+  W066: "Implied eval. Consider passing a function instead of a string.",
+  W067: "Unorthodox function invocation.",
+  W068: "Wrapping non-IIFE function literals in parens is unnecessary.",
+  W069: "['{a}'] is better written in dot notation.",
+  W070: "Extra comma. (it breaks older versions of IE)",
+  W071: "This function has too many statements. ({a})",
+  W072: "This function has too many parameters. ({a})",
+  W073: "Blocks are nested too deeply. ({a})",
+  W074: "This function's cyclomatic complexity is too high. ({a})",
+  W075: "Duplicate {a} '{b}'.",
+  W076: "Unexpected parameter '{a}' in get {b} function.",
+  W077: "Expected a single parameter in set {a} function.",
+  W078: "Setter is defined without getter.",
+  W079: "Redefinition of '{a}'.",
+  W080: "It's not necessary to initialize '{a}' to 'undefined'.",
+  W081: null,
+  W082: "Function declarations should not be placed in blocks. " +
+    "Use a function expression or move the statement to the top of " +
+    "the outer function.",
+  W083: "Functions declared within loops referencing an outer scoped " +
+    "variable may lead to confusing semantics. ({a})",
+  W084: "Expected a conditional expression and instead saw an assignment.",
+  W085: "Don't use 'with'.",
+  W086: "Expected a 'break' statement before '{a}'.",
+  W087: "Forgotten 'debugger' statement?",
+  W088: "Creating global 'for' variable. Should be 'for (var {a} ...'.",
+  W089: "The body of a for in should be wrapped in an if statement to filter " +
+    "unwanted properties from the prototype.",
+  W090: "'{a}' is not a statement label.",
+  W091: null,
+  W093: "Did you mean to return a conditional instead of an assignment?",
+  W094: "Unexpected comma.",
+  W095: "Expected a string and instead saw {a}.",
+  W096: "The '{a}' key may produce unexpected results.",
+  W097: "Use the function form of \"use strict\".",
+  W098: "'{a}' is defined but never used.",
+  W099: null,
+  W100: null,
+  W101: "Line is too long.",
+  W102: null,
+  W103: "The '{a}' property is deprecated.",
+  W104: "'{a}' is available in ES{b} (use 'esversion: {b}') or Mozilla JS extensions (use moz).",
+  W105: null,
+  W106: "Identifier '{a}' is not in camel case.",
+  W107: "Script URL.",
+  W108: "Strings must use doublequote.",
+  W109: "Strings must use singlequote.",
+  W110: "Mixed double and single quotes.",
+  W112: "Unclosed string.",
+  W113: "Control character in string: {a}.",
+  W114: "Avoid {a}.",
+  W115: "Octal literals are not allowed in strict mode.",
+  W116: "Expected '{a}' and instead saw '{b}'.",
+  W117: "'{a}' is not defined.",
+  W118: "'{a}' is only available in Mozilla JavaScript extensions (use moz option).",
+  W119: "'{a}' is only available in ES{b} (use 'esversion: {b}').",
+  W120: "You might be leaking a variable ({a}) here.",
+  W121: "Extending prototype of native object: '{a}'.",
+  W122: "Invalid typeof value '{a}'",
+  W123: "'{a}' is already defined in outer scope.",
+  W124: "A generator function should contain at least one yield expression.",
+  W125: "This line contains non-breaking spaces: http://jshint.com/docs/options/#nonbsp",
+  W126: "Unnecessary grouping operator.",
+  W127: "Unexpected use of a comma operator.",
+  W128: "Empty array elements require elision=true.",
+  W129: "'{a}' is defined in a future version of JavaScript. Use a " +
+    "different variable name to avoid migration issues.",
+  W130: "Invalid element after rest element.",
+  W131: "Invalid parameter after rest parameter.",
+  W132: "`var` declarations are forbidden. Use `let` or `const` instead.",
+  W133: "Invalid for-{a} loop left-hand-side: {b}.",
+  W134: "The '{a}' option is only available when linting ECMAScript {b} code.",
+  W135: "{a} may not be supported by non-browser environments.",
+  W136: "'{a}' must be in function scope.",
+  W137: "Empty destructuring: this is unnecessary and can be removed.",
+  W138: "Regular parameters should not come after default parameters.",
+  W139: "Function expressions should not be used as the second operand to instanceof.",
+  W140: "Missing comma.",
+  W141: "Empty {a}: this is unnecessary and can be removed.",
+  W142: "Empty {a}: consider replacing with `import '{b}';`.",
+  W143: "Assignment to properties of a mapped arguments object may cause " +
+    "unexpected changes to formal parameters.",
+  W144: "'{a}' is a non-standard language feature. Enable it using the '{b}' unstable option.",
+  W145: "Superfluous 'case' clause.",
+  W146: "Unnecessary `await` expression.",
+  W147: "Regular expressions should include the 'u' flag.",
+  W148: "Unnecessary RegExp 's' flag."
+};
+
+var info = {
+  I001: "Comma warnings can be turned off with 'laxcomma'.",
+  I002: null,
+  I003: "ES5 option is now set per default"
+};
+
+exports.errors = {};
+exports.warnings = {};
+exports.info = {};
+
+_.each(errors, function(desc, code) {
+  exports.errors[code] = { code: code, desc: desc };
+});
+
+_.each(warnings, function(desc, code) {
+  exports.warnings[code] = { code: code, desc: desc };
+});
+
+_.each(info, function(desc, code) {
+  exports.info[code] = { code: code, desc: desc };
+});
+
+},{"lodash":16}],19:[function(require,module,exports){
+/**
+ * The NameStack class is used to approximate function name inference as
+ * introduced by ECMAScript 2015. In that edition, the `name` property of
+ * function objects is set according to the function's syntactic form. For
+ * certain forms, this value depends on values available to the runtime during
+ * execution. For example:
+ *
+ *     var fnName = function() {};
+ *
+ * In the program code above, the function object's `name` property is set to
+ * `"fnName"` during execution.
+ *
+ * This general "name inference" behavior extends to a number of additional
+ * syntactic forms, not all of which can be implemented statically. `NameStack`
+ * is a support class representing a "best-effort" attempt to implement the
+ * specified behavior in cases where this may be done statically.
+ *
+ * For more information on this behavior, see the following blog post:
+ * https://bocoup.com/blog/whats-in-a-function-name
+ */
+"use strict";
+
+function NameStack() {
+  this._stack = [];
+}
+
+Object.defineProperty(NameStack.prototype, "length", {
+  get: function() {
+    return this._stack.length;
+  }
+});
+
+/**
+ * Create a new entry in the stack. Useful for tracking names across
+ * expressions.
+ */
+NameStack.prototype.push = function() {
+  this._stack.push(null);
+};
+
+/**
+ * Discard the most recently-created name on the stack.
+ */
+NameStack.prototype.pop = function() {
+  this._stack.pop();
+};
+
+/**
+ * Update the most recent name on the top of the stack.
+ *
+ * @param {object} token The token to consider as the source for the most
+ *                       recent name.
+ */
+NameStack.prototype.set = function(token) {
+  this._stack[this.length - 1] = token;
+};
+
+/**
+ * Generate a string representation of the most recent name.
+ *
+ * @returns {string}
+ */
+NameStack.prototype.infer = function() {
+  var nameToken = this._stack[this.length - 1];
+  var prefix = "";
+  var type;
+
+  // During expected operation, the topmost entry on the stack will only
+  // reflect the current function's name when the function is declared without
+  // the `function` keyword (i.e. for in-line accessor methods). In other
+  // cases, the `function` expression itself will introduce an empty entry on
+  // the top of the stack, and this should be ignored.
+  if (!nameToken || nameToken.type === "class") {
+    nameToken = this._stack[this.length - 2];
+  }
+
+  if (!nameToken) {
+    return "(empty)";
+  }
+
+  type = nameToken.type;
+
+  if (type !== "(string)" && type !== "(number)" && type !== "(identifier)" && type !== "default") {
+    return "(expression)";
+  }
+
+  if (nameToken.accessorType) {
+    prefix = nameToken.accessorType + " ";
+  }
+
+  return prefix + nameToken.value;
+};
+
+module.exports = NameStack;
+
+},{}],20:[function(require,module,exports){
+"use strict";
+
+// These are the JSHint boolean options.
+exports.bool = {
+  enforcing: {
+
+    /**
+     * This option prohibits the use of bitwise operators such as `^` (XOR),
+     * `|` (OR) and others. Bitwise operators are very rare in JavaScript
+     * programs and quite often `&` is simply a mistyped `&&`.
+     */
+    bitwise     : true,
+
+    /**
+     *
+     * This options prohibits overwriting prototypes of native objects such as
+     * `Array`, `Date` and so on.
+     *
+     *     // jshint freeze:true
+     *     Array.prototype.count = function (value) { return 4; };
+     *     // -> Warning: Extending prototype of native object: 'Array'.
+     */
+    freeze      : true,
+
+    /**
+     * This option allows you to force all variable names to use either
+     * camelCase style or UPPER_CASE with underscores.
+     *
+     * @deprecated JSHint is limiting its scope to issues of code correctness.
+     *             If you would like to enforce rules relating to code style,
+     *             check out [the JSCS
+     *             project](https://github.com/jscs-dev/node-jscs).
+     */
+    camelcase   : true,
+
+    /**
+     * This option requires you to always put curly braces around blocks in
+     * loops and conditionals. JavaScript allows you to omit curly braces when
+     * the block consists of only one statement, for example:
+     *
+     *     while (day)
+     *       shuffle();
+     *
+     * However, in some circumstances, it can lead to bugs (you'd think that
+     * `sleep()` is a part of the loop while in reality it is not):
+     *
+     *     while (day)
+     *       shuffle();
+     *       sleep();
+     */
+    curly       : true,
+
+    /**
+     * This options prohibits the use of `==` and `!=` in favor of `===` and
+     * `!==`. The former try to coerce values before comparing them which can
+     * lead to some unexpected results. The latter don't do any coercion so
+     * they are generally safer. If you would like to learn more about type
+     * coercion in JavaScript, we recommend [Truth, Equality and
+     * JavaScript](http://javascriptweblog.wordpress.com/2011/02/07/truth-equality-and-javascript/)
+     * by Angus Croll.
+     */
+    eqeqeq      : true,
+
+    /**
+     * This option enables warnings about the use of identifiers which are
+     * defined in future versions of JavaScript. Although overwriting them has
+     * no effect in contexts where they are not implemented, this practice can
+     * cause issues when migrating codebases to newer versions of the language.
+     */
+    futurehostile: true,
+
+    /**
+     * This option tells JSHint that your code needs to adhere to ECMAScript 3
+     * specification. Use this option if you need your program to be executable
+     * in older browsers—such as Internet Explorer 6/7/8/9—and other legacy
+     * JavaScript environments.
+     *
+     * @deprecated Use `esversion: 3` instead.
+     */
+    es3         : true,
+
+    /**
+     * This option enables syntax first defined in [the ECMAScript 5.1
+     * specification](http://es5.github.io/). This includes allowing reserved
+     * keywords as object properties.
+     *
+     * @deprecated Use `esversion: 5` instead.
+     */
+    es5         : true,
+
+    /**
+     * This option requires all `for in` loops to filter object's items. The
+     * for in statement allows for looping through the names of all of the
+     * properties of an object including those inherited through the prototype
+     * chain. This behavior can lead to unexpected items in your object so it
+     * is generally safer to always filter inherited properties out as shown in
+     * the example:
+     *
+     *     for (key in obj) {
+     *       if (obj.hasOwnProperty(key)) {
+     *         // We are sure that obj[key] belongs to the object and was not inherited.
+     *       }
+     *     }
+     *
+     * For more in-depth understanding of `for in` loops in JavaScript, read
+     * [Exploring JavaScript for-in
+     * loops](http://javascriptweblog.wordpress.com/2011/01/04/exploring-javascript-for-in-loops/)
+     * by Angus Croll.
+     */
+    forin       : true,
+
+    /**
+     * This option prohibits the use of immediate function invocations without
+     * wrapping them in parentheses. Wrapping parentheses assists readers of
+     * your code in understanding that the expression is the result of a
+     * function, and not the function itself.
+     *
+     * @deprecated JSHint is limiting its scope to issues of code correctness.
+     *             If you would like to enforce rules relating to code style,
+     *             check out [the JSCS
+     *             project](https://github.com/jscs-dev/node-jscs).
+     */
+    immed       : true,
+
+    /**
+     * This option prohibits unnecessary clauses within `switch` statements,
+     * e.g.
+     *
+     *     switch (x) {
+     *       case 1:
+     *       default:
+     *         z();
+     *     }
+     *
+     * While clauses like these are techincally valid, they do not effect
+     * program behavior and may indicate an erroneous refactoring.
+     */
+    leanswitch  : true,
+
+    /**
+     * This option requires you to capitalize names of constructor functions.
+     * Capitalizing functions that are intended to be used with `new` operator
+     * is just a convention that helps programmers to visually distinguish
+     * constructor functions from other types of functions to help spot
+     * mistakes when using `this`.
+     *
+     * Not doing so won't break your code in any browsers or environments but
+     * it will be a bit harder to figure out—by reading the code—if the
+     * function was supposed to be used with or without new. And this is
+     * important because when the function that was intended to be used with
+     * `new` is used without it, `this` will point to the global object instead
+     * of a new object.
+     *
+     * @deprecated JSHint is limiting its scope to issues of code correctness.
+     *             If you would like to enforce rules relating to code style,
+     *             check out [the JSCS
+     *             project](https://github.com/jscs-dev/node-jscs).
+     */
+    newcap      : true,
+
+    /**
+     * This option prohibits the use of `arguments.caller` and
+     * `arguments.callee`.  Both `.caller` and `.callee` make quite a few
+     * optimizations impossible so they were deprecated in future versions of
+     * JavaScript. In fact, ECMAScript 5 forbids the use of `arguments.callee`
+     * in strict mode.
+     */
+    noarg       : true,
+
+    /**
+     * This option prohibits the use of the comma operator. When misused, the
+     * comma operator can obscure the value of a statement and promote
+     * incorrect code.
+     */
+    nocomma     : true,
+
+    /**
+     * This option warns when you have an empty block in your code. JSLint was
+     * originally warning for all empty blocks and we simply made it optional.
+     * There were no studies reporting that empty blocks in JavaScript break
+     * your code in any way.
+     *
+     * @deprecated JSHint is limiting its scope to issues of code correctness.
+     *             If you would like to enforce rules relating to code style,
+     *             check out [the JSCS
+     *             project](https://github.com/jscs-dev/node-jscs).
+     */
+    noempty     : true,
+
+    /**
+     * This option warns about "non-breaking whitespace" characters. These
+     * characters can be entered with option-space on Mac computers and have a
+     * potential of breaking non-UTF8 web pages.
+     */
+    nonbsp      : true,
+
+    /**
+     * This option prohibits the use of constructor functions for side-effects.
+     * Some people like to call constructor functions without assigning its
+     * result to any variable:
+     *
+     *     new MyConstructor();
+     *
+     * There is no advantage in this approach over simply calling
+     * `MyConstructor` since the object that the operator `new` creates isn't
+     * used anywhere so you should generally avoid constructors like this one.
+     */
+    nonew       : true,
+
+
+    /**
+     * Async functions resolve on their return value. In most cases, this makes
+     * returning the result of an AwaitExpression (which is itself a Promise
+     * instance) unnecessary. For clarity, it's often preferable to return the
+     * result of the asynchronous operation directly. The notable exception is
+     * within the `try` clause of a TryStatement--for more, see "await vs
+     * return vs return await":
+     *
+     * https://jakearchibald.com/2017/await-vs-return-vs-return-await/
+     */
+    noreturnawait: true,
+
+    /**
+     * This option enables warnings for regular expressions which do not
+     * include the "u" flag. The "u" flag extends support for Unicode and also
+     * enables more strict parsing rules. JSHint will enforce these rules even
+     * if it is executed in a JavaScript engine which does not support the "u"
+     * flag.
+     */
+    regexpu     : true,
+
+    /**
+     * This option prohibits the use of explicitly undeclared variables. This
+     * option is very useful for spotting leaking and mistyped variables.
+     *
+     *     // jshint undef:true
+     *
+     *     function test() {
+     *       var myVar = 'Hello, World';
+     *       console.log(myvar); // Oops, typoed here. JSHint with undef will complain
+     *     }
+     *
+     * If your variable is defined in another file, you can use the `global`
+     * directive to tell JSHint about it.
+     */
+    undef       : true,
+
+    /**
+     * This option prohibits the use of the grouping operator when it is not
+     * strictly required. Such usage commonly reflects a misunderstanding of
+     * unary operators, for example:
+     *
+     *     // jshint singleGroups: true
+     *
+     *     delete(obj.attr); // Warning: Unnecessary grouping operator.
+     */
+    singleGroups: false,
+
+    /**
+     * When set to true, the use of VariableStatements are forbidden.
+     * For example:
+     *
+     *     // jshint varstmt: true
+     *
+     *     var a; // Warning: `var` declarations are forbidden. Use `let` or `const` instead.
+     */
+    varstmt: false,
+
+    /**
+     * This option is a short hand for the most strict JSHint configuration as
+     * available in JSHint version 2.6.3. It enables all enforcing options and
+     * disables all relaxing options that were defined in that release.
+     *
+     * @deprecated The option cannot be maintained without automatically opting
+     *             users in to new features. This can lead to unexpected
+     *             warnings/errors in when upgrading between minor versions of
+     *             JSHint.
+     */
+    enforceall : false,
+
+    /**
+     * This option warns when a comma is not placed after the last element in an
+     * array or object literal. Due to bugs in old versions of IE, trailing
+     * commas used to be discouraged, but since ES5 their semantics were
+     * standardized. (See
+     * [#11.1.4](http://www.ecma-international.org/ecma-262/5.1/#sec-11.1.4) and
+     * [#11.1.5](http://www.ecma-international.org/ecma-262/5.1/#sec-11.1.5).)
+     * Now, they help to prevent the same [visual
+     * ambiguities](http://www.ecma-international.org/ecma-262/5.1/#sec-7.9.2)
+     * that the strict usage of semicolons helps prevent.
+     *
+     * For example, this code might have worked last Tuesday:
+     *
+     *     [
+     *         b + c
+     *     ].forEach(print);
+     *
+     * But if one adds an element to the array and forgets to compensate for the
+     * missing comma, no syntax error is thrown, and a linter cannot determine
+     * if this was a mistake or an intentional function invocation.
+     *
+     *     [
+     *         b + c
+     *         (d + e)
+     *     ].forEach(print);
+     *
+     * If one always appends a list item with a comma, this ambiguity cannot
+     * occur:
+     *
+     *     [
+     *         b + c,
+     *     ].forEach(print);
+     *
+     *     [
+     *         b + c,
+     *         (d + e),
+     *     ].forEach(print);
+     */
+    trailingcomma: false
+  },
+  relaxing: {
+
+    /**
+     * This option suppresses warnings about missing semicolons. There is a lot
+     * of FUD about semicolon spread by quite a few people in the community.
+     * The common myths are that semicolons are required all the time (they are
+     * not) and that they are unreliable. JavaScript has rules about semicolons
+     * which are followed by *all* browsers so it is up to you to decide
+     * whether you should or should not use semicolons in your code.
+     *
+     * For more information about semicolons in JavaScript read [An Open Letter
+     * to JavaScript Leaders Regarding
+     * Semicolons](http://blog.izs.me/post/2353458699/an-open-letter-to-javascript-leaders-regarding)
+     * by Isaac Schlueter and [JavaScript Semicolon
+     * Insertion](http://inimino.org/~inimino/blog/javascript_semicolons).
+     */
+    asi         : true,
+
+    /**
+     * This option suppresses warnings about multi-line strings. Multi-line
+     * strings can be dangerous in JavaScript because all hell breaks loose if
+     * you accidentally put a whitespace in between the escape character (`\`)
+     * and a new line.
+     *
+     * Note that even though this option allows correct multi-line strings, it
+     * still warns about multi-line strings without escape characters or with
+     * anything in between the escape character and a whitespace.
+     *
+     *     // jshint multistr:true
+     *
+     *     var text = "Hello\
+     *     World"; // All good.
+     *
+     *     text = "Hello
+     *     World"; // Warning, no escape character.
+     *
+     *     text = "Hello\
+     *     World"; // Warning, there is a space after \
+     *
+     * @deprecated JSHint is limiting its scope to issues of code correctness.
+     *             If you would like to enforce rules relating to code style,
+     *             check out [the JSCS
+     *             project](https://github.com/jscs-dev/node-jscs).
+     */
+    multistr    : true,
+
+    /**
+     * This option suppresses warnings about the `debugger` statements in your
+     * code.
+     */
+    debug       : true,
+
+    /**
+     * This option suppresses warnings about the use of assignments in cases
+     * where comparisons are expected. More often than not, code like `if (a =
+     * 10) {}` is a typo. However, it can be useful in cases like this one:
+     *
+     *     for (var i = 0, person; person = people[i]; i++) {}
+     *
+     * You can silence this error on a per-use basis by surrounding the assignment
+     * with parenthesis, such as:
+     *
+     *     for (var i = 0, person; (person = people[i]); i++) {}
+     */
+    boss        : true,
+
+    /**
+     * This option suppresses warnings about the use of `eval`. The use of
+     * `eval` is discouraged because it can make your code vulnerable to
+     * various injection attacks and it makes it hard for JavaScript
+     * interpreter to do certain optimizations.
+    */
+    evil        : true,
+
+    /**
+     * This option suppresses warnings about declaring variables inside
+     * of control structures while accessing them later from the outside.
+     * Even though identifiers declared with `var` have two real scopes—global
+     * and function—such practice leads to confusion among people new to
+     * the language and hard-to-debug bugs. This is why, by default, JSHint
+     * warns about variables that are used outside of their intended scope.
+     *
+     *     function test() {
+     *       if (true) {
+     *         var x = 0;
+     *       }
+     *
+     *       x += 1; // Default: 'x' used out of scope.
+     *                 // No warning when funcscope:true
+     *     }
+     */
+    funcscope   : true,
+
+    /**
+     * This option suppresses warnings about the use of global strict mode.
+     * Global strict mode can break third-party widgets so it is not
+     * recommended.
+     *
+     * For more info about strict mode see the `strict` option.
+     *
+     * @deprecated Use `strict: "global"`.
+     */
+    globalstrict: true,
+
+    /**
+     * This option suppresses warnings about the `__iterator__` property. This
+     * property is not supported by all browsers so use it carefully.
+     */
+    iterator    : true,
+
+     /**
+     * This option suppresses warnings about invalid `typeof` operator values.
+     * This operator has only [a limited set of possible return
+     * values](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/typeof).
+     * By default, JSHint warns when you compare its result with an invalid
+     * value which often can be a typo.
+     *
+     *     // 'fuction' instead of 'function'
+     *     if (typeof a == "fuction") { // Invalid typeof value 'fuction'
+     *       // ...
+     *     }
+     *
+     * Do not use this option unless you're absolutely sure you don't want
+     * these checks.
+     */
+    notypeof    : true,
+
+    /**
+     * This option prohibits the use of unary increment and decrement
+     * operators.  Some people think that `++` and `--` reduces the quality of
+     * their coding styles and there are programming languages—such as
+     * Python—that go completely without these operators.
+     */
+    plusplus    : true,
+
+    /**
+     * This option suppresses warnings about the `__proto__` property.
+     */
+    proto       : true,
+
+    /**
+     * This option suppresses warnings about the use of script-targeted
+     * URLs—such as `javascript:...`.
+     */
+    scripturl   : true,
+
+    /**
+     * This option suppresses warnings about using `[]` notation when it can be
+     * expressed in dot notation: `person['name']` vs. `person.name`.
+     *
+     * @deprecated JSHint is limiting its scope to issues of code correctness.
+     *             If you would like to enforce rules relating to code style,
+     *             check out [the JSCS
+     *             project](https://github.com/jscs-dev/node-jscs).
+     */
+    sub         : true,
+
+    /**
+     * This option suppresses warnings about "weird" constructions like
+     * `new function () { ... }` and `new Object;`. Such constructions are
+     * sometimes used to produce singletons in JavaScript:
+     *
+     *     var singleton = new function() {
+     *       var privateVar;
+     *
+     *       this.publicMethod  = function () {}
+     *       this.publicMethod2 = function () {}
+     *     };
+     */
+    supernew    : true,
+
+    /**
+     * This option suppresses most of the warnings about possibly unsafe line
+     * breakings in your code. It doesn't suppress warnings about comma-first
+     * coding style. To suppress those you have to use `laxcomma` (see below).
+     *
+     * @deprecated JSHint is limiting its scope to issues of code correctness.
+     *             If you would like to enforce rules relating to code style,
+     *             check out [the JSCS
+     *             project](https://github.com/jscs-dev/node-jscs).
+     */
+    laxbreak    : true,
+
+    /**
+     * This option suppresses warnings about comma-first coding style:
+     *
+     *     var obj = {
+     *         name: 'Anton'
+     *       , handle: 'valueof'
+     *       , role: 'SW Engineer'
+     *     };
+     *
+     * @deprecated JSHint is limiting its scope to issues of code correctness.
+     *             If you would like to enforce rules relating to code style,
+     *             check out [the JSCS
+     *             project](https://github.com/jscs-dev/node-jscs).
+     */
+    laxcomma    : true,
+
+    /**
+     * This option suppresses warnings about possible strict violations when
+     * the code is running in strict mode and you use `this` in a
+     * non-constructor function. You should use this option—in a function scope
+     * only—when you are positive that your use of `this` is valid in the
+     * strict mode (for example, if you call your function using
+     * `Function.call`).
+     *
+     * **Note:** This option can be used only inside of a function scope.
+     * JSHint will fail with an error if you will try to set this option
+     * globally.
+     */
+    validthis   : true,
+
+    /**
+     * This option suppresses warnings about the use of the `with` statement.
+     * The semantics of the `with` statement can cause confusion among
+     * developers and accidental definition of global variables.
+     *
+     * More info:
+     *
+     * * [with Statement Considered
+     *   Harmful](http://yuiblog.com/blog/2006/04/11/with-statement-considered-harmful/)
+     */
+    withstmt    : true,
+
+    /**
+     * This options tells JSHint that your code uses Mozilla JavaScript
+     * extensions. Unless you develop specifically for the Firefox web browser
+     * you don't need this option.
+     *
+     * More info:
+     *
+     * * [New in JavaScript
+     *   1.7](https://developer.mozilla.org/en-US/docs/JavaScript/New_in_JavaScript/1.7)
+     */
+    moz         : true,
+
+    /**
+     * This option suppresses warnings about generator functions with no
+     * `yield` statement in them.
+     */
+    noyield     : true,
+
+    /**
+     * This option suppresses warnings about `== null` comparisons. Such
+     * comparisons are often useful when you want to check if a variable is
+     * `null` or `undefined`.
+     */
+    eqnull      : true,
+
+    /**
+     * This option suppresses warnings about missing semicolons, but only when
+     * the semicolon is omitted for the last statement in a one-line block:
+     *
+     *     var name = (function() { return 'Anton' }());
+     *
+     * This is a very niche use case that is useful only when you use automatic
+     * JavaScript code generators.
+     */
+    lastsemic   : true,
+
+    /**
+     * This option suppresses warnings about functions inside of loops.
+     * Defining functions inside of loops can lead to bugs such as this one:
+     *
+     *     var nums = [];
+     *
+     *     for (var i = 0; i < 10; i++) {
+     *       nums[i] = function (j) {
+     *         return i + j;
+     *       };
+     *     }
+     *
+     *     nums[0](2); // Prints 12 instead of 2
+     *
+     * To fix the code above you need to copy the value of `i`:
+     *
+     *     var nums = [];
+     *
+     *     for (var i = 0; i < 10; i++) {
+     *       (function (i) {
+     *         nums[i] = function (j) {
+     *             return i + j;
+     *         };
+     *       }(i));
+     *     }
+     */
+    loopfunc    : true,
+
+    /**
+     * This option suppresses warnings about the use of expressions where
+     * normally you would expect to see assignments or function calls. Most of
+     * the time, such code is a typo. However, it is not forbidden by the spec
+     * and that's why this warning is optional.
+     */
+    expr        : true,
+
+    /**
+     * This option tells JSHint that your code uses ECMAScript 6 specific
+     * syntax. Note that not all browsers implement these features.
+     *
+     * More info:
+     *
+     * * [Specification for ECMAScript
+     *   6](http://www.ecma-international.org/ecma-262/6.0/index.html)
+     *
+     * @deprecated Use `esversion: 6` instead.
+     */
+    esnext      : true,
+
+    /**
+     * This option tells JSHint that your code uses ES3 array elision elements,
+     * or empty elements (for example, `[1, , , 4, , , 7]`).
+     */
+    elision     : true,
+  },
+
+  // Third party globals
+  environments: {
+
+    /**
+     * This option defines globals exposed by the
+     * [MooTools](http://mootools.net/) JavaScript framework.
+     */
+    mootools    : true,
+
+    /**
+     * This option defines globals exposed by
+     * [CouchDB](http://couchdb.apache.org/). CouchDB is a document-oriented
+     * database that can be queried and indexed in a MapReduce fashion using
+     * JavaScript.
+     */
+    couch       : true,
+
+    /**
+     * This option defines globals exposed by [the Jasmine unit testing
+     * framework](https://jasmine.github.io/).
+     */
+    jasmine     : true,
+
+    /**
+     * This option defines globals exposed by the [jQuery](http://jquery.com/)
+     * JavaScript library.
+     */
+    jquery      : true,
+
+    /**
+     * This option defines globals available when your code is running inside
+     * of the Node runtime environment. [Node.js](http://nodejs.org/) is a
+     * server-side JavaScript environment that uses an asynchronous
+     * event-driven model. This option also skips some warnings that make sense
+     * in the browser environments but don't make sense in Node such as
+     * file-level `use strict` pragmas and `console.log` statements.
+     */
+    node        : true,
+
+    /**
+     * This option defines globals exposed by [the QUnit unit testing
+     * framework](http://qunitjs.com/).
+     */
+    qunit       : true,
+
+    /**
+     * This option defines globals available when your code is running inside
+     * of the Rhino runtime environment. [Rhino](http://www.mozilla.org/rhino/)
+     * is an open-source implementation of JavaScript written entirely in Java.
+     */
+    rhino       : true,
+
+    /**
+     * This option defines globals exposed by [the ShellJS
+     * library](http://documentup.com/arturadib/shelljs).
+     */
+    shelljs     : true,
+
+    /**
+     * This option defines globals exposed by the
+     * [Prototype](http://www.prototypejs.org/) JavaScript framework.
+     */
+    prototypejs : true,
+
+    /**
+     * This option defines globals exposed by the [YUI](http://yuilibrary.com/)
+     * JavaScript framework.
+     */
+    yui         : true,
+
+    /**
+     * This option defines globals exposed by the "BDD" and "TDD" UIs of the
+     * [Mocha unit testing framework](http://mochajs.org/).
+     */
+    mocha       : true,
+
+    /**
+     * This option informs JSHint that the input code describes an ECMAScript 6
+     * module. All module code is interpreted as strict mode code.
+     */
+    module      : true,
+
+    /**
+     * This option defines globals available when your code is running as a
+     * script for the [Windows Script
+     * Host](http://en.wikipedia.org/wiki/Windows_Script_Host).
+     */
+    wsh         : true,
+
+    /**
+     * This option defines globals available when your code is running inside
+     * of a Web Worker. [Web
+     * Workers](https://developer.mozilla.org/en/Using_web_workers) provide a
+     * simple means for web content to run scripts in background threads.
+     */
+    worker      : true,
+
+    /**
+     * This option defines non-standard but widely adopted globals such as
+     * `escape` and `unescape`.
+     */
+    nonstandard : true,
+
+    /**
+     * This option defines globals exposed by modern browsers: all the way from
+     * good old `document` and `navigator` to the HTML5 `FileReader` and other
+     * new developments in the browser world.
+     *
+     * **Note:** This option doesn't expose variables like `alert` or
+     * `console`. See option `devel` for more information.
+     */
+    browser     : true,
+
+    /**
+     * This option defines globals available when using [the Browserify
+     * tool](http://browserify.org/) to build a project.
+     */
+    browserify  : true,
+
+    /**
+     * This option defines globals that are usually used for logging poor-man's
+     * debugging: `console`, `alert`, etc. It is usually a good idea to not
+     * ship them in production because, for example, `console.log` breaks in
+     * legacy versions of Internet Explorer.
+     */
+    devel       : true,
+
+    /**
+     * This option defines globals exposed by the [Dojo
+     * Toolkit](http://dojotoolkit.org/).
+     */
+    dojo        : true,
+
+    /**
+     * This option defines globals for typed array constructors.
+     *
+     * More info:
+     *
+     * * [JavaScript typed
+     *   arrays](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Typed_arrays)
+     */
+    typed       : true,
+
+    /**
+     * This option defines globals available when your core is running inside
+     * of the PhantomJS runtime environment. [PhantomJS](http://phantomjs.org/)
+     * is a headless WebKit scriptable with a JavaScript API. It has fast and
+     * native support for various web standards: DOM handling, CSS selector,
+     * JSON, Canvas, and SVG.
+     */
+    phantom     : true
+  },
+
+  // Obsolete options
+  obsolete: {
+    onecase     : true, // if one case switch statements should be allowed
+    regexp      : true, // if the . should not be allowed in regexp literals
+    regexdash   : true  // if unescaped first/last dash (-) inside brackets
+                        // should be tolerated
+  }
+};
+
+// These are the JSHint options that can take any value
+// (we use this object to detect invalid options)
+exports.val = {
+
+  /**
+   * This option lets you set the maximum length of a line.
+   *
+   * @deprecated JSHint is limiting its scope to issues of code correctness. If
+   *             you would like to enforce rules relating to code style, check
+   *             out [the JSCS project](https://github.com/jscs-dev/node-jscs).
+   */
+  maxlen       : false,
+
+  /**
+   * This option sets a specific tab width for your code.
+   *
+   * @deprecated JSHint is limiting its scope to issues of code correctness. If
+   *             you would like to enforce rules relating to code style, check
+   *             out [the JSCS project](https://github.com/jscs-dev/node-jscs).
+   */
+  indent       : false,
+
+  /**
+   * This options allows you to set the maximum amount of warnings JSHint will
+   * produce before giving up. Default is 50.
+   */
+  maxerr       : false,
+
+  /**
+   * This option allows you to control which variables JSHint considers to be
+   * implicitly defined in the environment. Configure it with an array of
+   * string values. Prefixing a variable name with a hyphen (-) character will
+   * remove that name from the collection of predefined variables.
+   *
+   * JSHint will consider variables declared in this way to be read-only.
+   *
+   * This option cannot be specified in-line; it may only be used via the
+   * JavaScript API or from an external configuration file.
+   */
+  predef       : false,
+
+  /**
+   * This option can be used to specify a white list of global variables that
+   * are not formally defined in the source code. This is most useful when
+   * combined with the `undef` option in order to suppress warnings for
+   * project-specific global variables.
+   *
+   * Setting an entry to `true` enables reading and writing to that variable.
+   * Setting it to `false` will trigger JSHint to consider that variable
+   * read-only.
+   *
+   * See also the "environment" options: a set of options to be used as short
+   * hand for enabling global variables defined in common JavaScript
+   * environments.
+   *
+   * To configure `globals` within an individual file, see [Inline
+   * Configuration](http://jshint.com/docs/#inline-configuration).
+   */
+  globals      : false,
+
+  /**
+   * This option enforces the consistency of quotation marks used throughout
+   * your code. It accepts three values: `true` if you don't want to enforce
+   * one particular style but want some consistency, `"single"` if you want to
+   * allow only single quotes and `"double"` if you want to allow only double
+   * quotes.
+   *
+   * @deprecated JSHint is limiting its scope to issues of code correctness. If
+   *             you would like to enforce rules relating to code style, check
+   *             out [the JSCS project](https://github.com/jscs-dev/node-jscs).
+   */
+  quotmark     : false,
+
+  scope        : false,
+
+  /**
+   * This option lets you set the max number of statements allowed per function:
+   *
+   *     // jshint maxstatements:4
+   *
+   *     function main() {
+   *       var i = 0;
+   *       var j = 0;
+   *
+   *       // Function declarations count as one statement. Their bodies
+   *       // don't get taken into account for the outer function.
+   *       function inner() {
+   *         var i2 = 1;
+   *         var j2 = 1;
+   *
+   *         return i2 + j2;
+   *       }
+   *
+   *       j = i + j;
+   *       return j; // JSHint: Too many statements per function. (5)
+   *     }
+   */
+  maxstatements: false,
+
+  /**
+   * This option lets you control how nested do you want your blocks to be:
+   *
+   *     // jshint maxdepth:2
+   *
+   *     function main(meaning) {
+   *       var day = true;
+   *
+   *       if (meaning === 42) {
+   *         while (day) {
+   *           shuffle();
+   *
+   *           if (tired) { // JSHint: Blocks are nested too deeply (3).
+   *               sleep();
+   *           }
+   *         }
+   *       }
+   *     }
+   */
+  maxdepth     : false,
+
+  /**
+   * This option lets you set the max number of formal parameters allowed per
+   * function:
+   *
+   *     // jshint maxparams:3
+   *
+   *     function login(request, onSuccess) {
+   *       // ...
+   *     }
+   *
+   *     // JSHint: Too many parameters per function (4).
+   *     function logout(request, isManual, whereAmI, onSuccess) {
+   *       // ...
+   *     }
+   */
+  maxparams    : false,
+
+  /**
+   * This option lets you control cyclomatic complexity throughout your code.
+   * Cyclomatic complexity measures the number of linearly independent paths
+   * through a program's source code. Read more about [cyclomatic complexity on
+   * Wikipedia](http://en.wikipedia.org/wiki/Cyclomatic_complexity).
+   */
+  maxcomplexity: false,
+
+  /**
+   * This option suppresses warnings about variable shadowing i.e. declaring a
+   * variable that had been already declared somewhere in the outer scope.
+   *
+   * - "inner"  - check for variables defined in the same scope only
+   * - "outer"  - check for variables defined in outer scopes as well
+   * - false    - same as inner
+   * - true     - allow variable shadowing
+   */
+  shadow       : false,
+
+  /**
+   * This option requires the code to run in ECMAScript 5's strict mode.
+   * [Strict mode](https://developer.mozilla.org/en/JavaScript/Strict_mode)
+   * is a way to opt in to a restricted variant of JavaScript. Strict mode
+   * eliminates some JavaScript pitfalls that didn't cause errors by changing
+   * them to produce errors.  It also fixes mistakes that made it difficult
+   * for the JavaScript engines to perform certain optimizations.
+   *
+   * - "global"  - there must be a `"use strict";` directive at global level
+   * - "implied" - lint the code as if there is the `"use strict";` directive
+   * - false     - disable warnings about strict mode
+   * - true      - there must be a `"use strict";` directive at function level;
+   *               this is preferable for scripts intended to be loaded in web
+   *               browsers directly because enabling strict mode globally
+   *               could adversely effect other scripts running on the same
+   *               page
+   */
+  strict      : true,
+
+  /**
+   * This option warns when you define and never use your variables. It is very
+   * useful for general code cleanup, especially when used in addition to
+   * `undef`.
+   *
+   *     // jshint unused:true
+   *
+   *     function test(a, b) {
+   *       var c, d = 2;
+   *
+   *       return a + d;
+   *     }
+   *
+   *     test(1, 2);
+   *
+   *     // Line 3: 'b' was defined but never used.
+   *     // Line 4: 'c' was defined but never used.
+   *
+   * In addition to that, this option will warn you about unused global
+   * variables declared via the `global` directive.
+   *
+   * When set to `true`, unused parameters that are followed by a used
+   * parameter will not produce warnings. This option can be set to `vars` to
+   * only check for variables, not function parameters, or `strict` to check
+   * all variables and parameters.
+   */
+  unused       : true,
+
+  /**
+   * This option prohibits the use of a variable before it was defined.
+   * JavaScript has function scope only and, in addition to that, all variables
+   * are always moved—or hoisted— to the top of the function. This behavior can
+   * lead to some very nasty bugs and that's why it is safer to always use
+   * variable only after they have been explicitly defined.
+   *
+   * Setting this option to "nofunc" will allow function declarations to be
+   * ignored.
+   *
+   * For more in-depth understanding of scoping and hoisting in JavaScript,
+   * read [JavaScript Scoping and
+   * Hoisting](http://www.adequatelygood.com/2010/2/JavaScript-Scoping-and-Hoisting)
+   * by Ben Cherry.
+   */
+  latedef      : false,
+
+  ignore       : false, // start/end ignoring lines of code, bypassing the lexer
+                        //   start    - start ignoring lines, including the current line
+                        //   end      - stop ignoring lines, starting on the next line
+                        //   line     - ignore warnings / errors for just a single line
+                        //              (this option does not bypass the lexer)
+
+  ignoreDelimiters: false, // array of start/end delimiters used to ignore
+                           // certain chunks from code
+
+  /**
+   * This option is used to specify the ECMAScript version to which the code
+   * must adhere. It can assume one of the following values:
+   *  - `3` - If you need your program to be executable
+   *    in older browsers—such as Internet Explorer 6/7/8/9—and other legacy
+   *    JavaScript environments
+   *  - `5` - To enable syntax first defined in [the ECMAScript 5.1
+   *    specification](http://www.ecma-international.org/ecma-262/5.1/index.html).
+   *    This includes allowing reserved keywords as object properties.
+   *  - `6` - To tell JSHint that your code uses [ECMAScript
+   *    6](http://www.ecma-international.org/ecma-262/6.0/index.html) specific
+   *    syntax. Note that not all browsers implement them.
+   *  - `7` - To enable language features introduced by [ECMAScript
+   *    7](https://www.ecma-international.org/ecma-262/7.0/index.html). Notable
+   *    additions: the exponentiation operator.
+   *  - `8` - To enable language features introduced by [ECMAScript
+   *    8](https://www.ecma-international.org/ecma-262/8.0/index.html). Notable
+   *    additions: async functions, shared memory, and atomics
+   *  - `9` - To enable language features introduced by [ECMAScript
+   *    9](https://www.ecma-international.org/ecma-262/9.0/index.html). Notable
+   *    additions: asynchronous iteration, rest/spread properties, and various
+   *    RegExp extensions
+   *  - `10` - To enable language features introduced by ECMAScript
+   *    10](https://www.ecma-international.org/ecma-262/10.0/index.html).
+   *    Notable additions: optional catch bindings.
+   */
+  esversion: 5
+};
+
+/**
+ * Unstable options allow control for parsing and linting of proposed additions
+ * to the JavaScript language. Just like the language features they describe,
+ * the presence and behavior of these options is volatile; JSHint reserves the
+ * right to remove or modify them between major version releases.
+ */
+exports.unstable = {
+  /**
+   * [The BigInt proposal](https://github.com/tc39/proposal-bigint) extends the
+   * language's grammer for numeric literals to support integer values of
+   * arbitrary precision. It also introduces a new value of the `typeof`
+   * operator, "bigint".
+   *
+   * Mathematical operations which use both BigInt and traditional ECMAScript
+   * Number values may not have the intended effect. Due to the weakly-typed
+   * nature of the language, JSHint is unable to identify such cases.
+   */
+  bigint: true
+};
+
+// These are JSHint boolean options which are shared with JSLint
+// where the definition in JSHint is opposite JSLint
+exports.inverted = {
+  bitwise : true,
+  forin   : true,
+  newcap  : true,
+  plusplus: true,
+  regexp  : true,
+  undef   : true,
+
+  // Inverted and renamed, use JSHint name here
+  eqeqeq  : true,
+  strict  : true
+};
+
+exports.validNames = Object.keys(exports.val)
+  .concat(Object.keys(exports.bool.relaxing))
+  .concat(Object.keys(exports.bool.enforcing))
+  .concat(Object.keys(exports.bool.obsolete))
+  .concat(Object.keys(exports.bool.environments))
+  .concat(["unstable"]);
+
+exports.unstableNames = Object.keys(exports.unstable);
+
+// These are JSHint boolean options which are shared with JSLint
+// where the name has been changed but the effect is unchanged
+exports.renamed = {
+  eqeq   : "eqeqeq",
+  windows: "wsh",
+  sloppy : "strict"
+};
+
+exports.removed = {
+  nomen: true,
+  onevar: true,
+  passfail: true,
+  white: true,
+  gcl: true,
+  smarttabs: true,
+  trailing: true
+};
+
+// Add options here which should not be automatically enforced by
+// `enforceall`.
+exports.noenforceall = {
+  varstmt: true,
+  strict: true,
+  regexpu: true
+};
+
+},{}],21:[function(require,module,exports){
+/**
+ * This module defines a set of enum-like values intended for use as bit
+ * "flags" during parsing. The ECMAScript grammar defines a number of such
+ * "production parameters" to control how certain forms are parsed in context.
+ * JSHint implements additional parameters to facilitate detection of lint
+ * warnings.
+ *
+ * An equivalent implementation which described the context in terms of a
+ * "lookup table" object would be more idiomatic for a JavaScript project like
+ * JSHint. However, because the number of contexts scales with the number of
+ * expressions in the input program, this would have non-negligible impact on
+ * the process's memory footprint.
+ */
+module.exports = {
+  /**
+   * Enabled when parsing expressions within ES2015 "export" declarations,
+   * allowing otherwise-unreferenced bindings to be considered "used".
+   */
+  export: 1,
+
+  /**
+   * Enabled when parsing expressions within the head of `for` statements,
+   * allowing to distinguish between `for-in` and "C-style" `for` statements.
+   */
+  noin: 2,
+
+  /**
+   * Enabled when the expression begins the statement, allowing the parser to
+   * correctly select between the null denotation ("nud") and first null
+   * denotation ("fud") parsing strategy.
+   */
+  initial: 4,
+
+  preAsync: 8,
+
+  async: 16,
+
+  /**
+   * Enabled when any exception thrown by the expression will be caught by a
+   * TryStatement.
+   */
+  tryClause: 32,
+
+  /**
+   * Enabled when parsing the body of a generator function.
+   */
+  yield: 64
+};
+
+},{}],22:[function(require,module,exports){
+/*
+ * Regular expressions. Some of these are stupidly long.
+ */
+
+/*jshint maxlen:1000 */
+
+"use strict";
+
+// Unsafe comment or string (ax)
+exports.unsafeString =
+  /@cc|<\/?|script|\]\s*\]|<\s*!|&lt/i;
+
+// Characters in strings that need escaping (nx and nxg)
+exports.needEsc =
+  /[\u0000-\u001f&<"\/\\\u007f-\u009f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/;
+
+exports.needEscGlobal =
+  /[\u0000-\u001f&<"\/\\\u007f-\u009f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g;
+
+// Star slash (lx)
+exports.starSlash = /\*\//;
+
+// Identifier (ix)
+exports.identifier = /^([a-zA-Z_$][a-zA-Z0-9_$]*)$/;
+
+// JavaScript URL (jx)
+exports.javascriptURL = /^(?:javascript|jscript|ecmascript|vbscript|livescript)\s*:/i;
+
+// Catches /* falls through */ comments (ft)
+exports.fallsThrough = /^\s*falls?\sthrough\s*$/;
+
+// very conservative rule (eg: only one space between the start of the comment and the first character)
+// to relax the maxlen option
+exports.maxlenException = /^(?:(?:\/\/|\/\*|\*) ?)?[^ ]+$/;
+
+// Node.js releases prior to version 8 include a version of the V8 engine which
+// incorrectly interprets the character class escape `\s`. The following
+// regular expression may be replaced with `/\s/` when JSHint removes support
+// for Node.js versions prior to 8.
+// Source:
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp
+exports.whitespace = /[ \f\n\r\t\v\u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff]/;
+
+exports.nonzeroDigit = /^[1-9]$/;
+
+exports.decimalDigit = /^[0-9]$/;
+
+exports.regexpSyntaxChars = /[\^$\\.*+?()[\]{}|]/;
+
+exports.regexpQuantifiers = /[*+?{]/;
+
+exports.regexpControlEscapes = /[fnrtv]/;
+
+exports.regexpCharClasses = /[dDsSwW]/;
+
+// Identifies the "dot" atom in regular expressions
+exports.regexpDot = /(^|[^\\])(\\\\)*\./;
+
+},{}],23:[function(require,module,exports){
+"use strict";
+/**
+ * A note on `__proto__`:
+ *
+ * This file uses ordinary objects to track identifiers that are observed in
+ * the input source code. It creates these objects using `Object.create` so
+ * that the tracking objects have no prototype, allowing the `__proto__`
+ * property to be used to store a value *without* triggering the invocation of
+ * the built-in `Object.prototype.__proto__` accessor method. Some environments
+ * (e.g. PhantomJS) do not implement the correct semantics for property
+ * enumeration. In those environments, methods like `Object.keys` and Lodash's
+ * `values` do not include the property name. This file includes a number of
+ * branches which ensure that JSHint behaves consistently in those
+ * environments. The branches must be ignored by the test coverage verification
+ * system because the workaround is not necessary in the environment where
+ * coverage is verified (i.e. Node.js).
+ */
+
+var _      = require("lodash");
+var events = require("events");
+
+// Used to denote membership in lookup tables (a primitive value such as `true`
+// would be silently rejected for the property name "__proto__" in some
+// environments)
+var marker = {};
+
+/**
+ * A factory function for creating scope managers. A scope manager tracks
+ * bindings, detecting when variables are referenced (through "usages").
+ *
+ * @param {object} state - the global state object (see `state.js`)
+ * @param {Array} predefined - a set of binding names for built-in bindings
+ *                             provided by the environment
+ * @param {object} exported - a hash for binding names that are intended to be
+ *                            referenced in contexts beyond the current program
+ *                            code
+ * @param {object} declared - a hash for binding names that were defined as
+ *                            global bindings via linting configuration
+ *
+ * @returns {object} - a scope manager
+ */
+var scopeManager = function(state, predefined, exported, declared) {
+
+  var _current;
+  var _scopeStack = [];
+
+  function _newScope(type) {
+    _current = {
+      "(bindings)": Object.create(null),
+      "(usages)": Object.create(null),
+      "(labels)": Object.create(null),
+      "(parent)": _current,
+      "(type)": type,
+      "(params)": (type === "functionparams" || type === "catchparams") ? [] : null
+    };
+    _scopeStack.push(_current);
+  }
+
+  _newScope("global");
+  _current["(predefined)"] = predefined;
+
+  var _currentFunctBody = _current; // this is the block after the params = function
+
+  var usedPredefinedAndGlobals = Object.create(null);
+  var impliedGlobals = Object.create(null);
+  var unuseds = [];
+  var emitter = new events.EventEmitter();
+
+  function warning(code, token) {
+    emitter.emit("warning", {
+      code: code,
+      token: token,
+      data: _.slice(arguments, 2)
+    });
+  }
+
+  function error(code, token) {
+    emitter.emit("warning", {
+      code: code,
+      token: token,
+      data: _.slice(arguments, 2)
+    });
+  }
+
+  function _setupUsages(bindingName) {
+    if (!_current["(usages)"][bindingName]) {
+      _current["(usages)"][bindingName] = {
+        "(modified)": [],
+        "(reassigned)": [],
+        "(tokens)": []
+      };
+    }
+  }
+
+  var _getUnusedOption = function(unused_opt) {
+    if (unused_opt === undefined) {
+      unused_opt = state.option.unused;
+    }
+
+    if (unused_opt === true) {
+      unused_opt = "last-param";
+    }
+
+    return unused_opt;
+  };
+
+  var _warnUnused = function(name, tkn, type, unused_opt) {
+    var line = tkn.line;
+    var chr  = tkn.from;
+    var raw_name = tkn.raw_text || name;
+
+    unused_opt = _getUnusedOption(unused_opt);
+
+    var warnable_types = {
+      "vars": ["var"],
+      "last-param": ["var", "param"],
+      "strict": ["var", "param", "last-param"]
+    };
+
+    if (unused_opt) {
+      if (warnable_types[unused_opt] && warnable_types[unused_opt].indexOf(type) !== -1) {
+        warning("W098", { line: line, from: chr }, raw_name);
+      }
+    }
+
+    // inconsistent - see gh-1894
+    if (unused_opt || type === "var") {
+      unuseds.push({
+        name: name,
+        line: line,
+        character: chr
+      });
+    }
+  };
+
+  /**
+   * Check the current scope for unused identifiers
+   */
+  function _checkForUnused() {
+    if (_current["(type)"] !== "functionparams") {
+      var currentBindings = _current["(bindings)"];
+      for (var bindingName in currentBindings) {
+        if (currentBindings[bindingName]["(type)"] !== "exception" &&
+          currentBindings[bindingName]["(unused)"]) {
+          _warnUnused(bindingName, currentBindings[bindingName]["(token)"], "var");
+        }
+      }
+      return;
+    }
+
+    // Check the current scope for unused parameters and issue warnings as
+    // necessary.
+    var params = _current["(params)"];
+
+    var param = params.pop();
+    var unused_opt;
+
+    while (param) {
+      var binding = _current["(bindings)"][param];
+
+      unused_opt = _getUnusedOption(state.funct["(unusedOption)"]);
+
+      // 'undefined' is a special case for the common pattern where `undefined`
+      // is used as a formal parameter name to defend against global
+      // re-assignment, e.g.
+      //
+      //     (function(window, undefined) {
+      //     })();
+      if (param === "undefined")
+        return;
+
+      if (binding["(unused)"]) {
+        _warnUnused(param, binding["(token)"], "param", state.funct["(unusedOption)"]);
+      } else if (unused_opt === "last-param") {
+        return;
+      }
+
+      param = params.pop();
+    }
+  }
+
+  /**
+   * Find the relevant binding's scope. The owning scope is located by first
+   * inspecting the current scope and then moving "downward" through the stack
+   * of scopes.
+   *
+   * @param {string} bindingName - the value of the identifier
+   *
+   * @returns {Object} - the scope in which the binding was found
+   */
+  function _getBinding(bindingName) {
+    for (var i = _scopeStack.length - 1 ; i >= 0; --i) {
+      var scopeBindings = _scopeStack[i]["(bindings)"];
+      if (scopeBindings[bindingName]) {
+        return scopeBindings;
+      }
+    }
+  }
+
+  /**
+   * Determine if a given binding name has been referenced within the current
+   * function or any function defined within.
+   *
+   * @param {string} bindingName - the value of the identifier
+   *
+   * @returns {boolean}
+   */
+  function usedSoFarInCurrentFunction(bindingName) {
+    for (var i = _scopeStack.length - 1; i >= 0; i--) {
+      var current = _scopeStack[i];
+      if (current["(usages)"][bindingName]) {
+        return current["(usages)"][bindingName];
+      }
+      if (current === _currentFunctBody) {
+        break;
+      }
+    }
+    return false;
+  }
+
+  function _checkOuterShadow(bindingName, token) {
+
+    // only check if shadow is outer
+    if (state.option.shadow !== "outer") {
+      return;
+    }
+
+    var isGlobal = _currentFunctBody["(type)"] === "global",
+      isNewFunction = _current["(type)"] === "functionparams";
+
+    var outsideCurrentFunction = !isGlobal;
+    for (var i = 0; i < _scopeStack.length; i++) {
+      var stackItem = _scopeStack[i];
+
+      if (!isNewFunction && _scopeStack[i + 1] === _currentFunctBody) {
+        outsideCurrentFunction = false;
+      }
+      if (outsideCurrentFunction && stackItem["(bindings)"][bindingName]) {
+        warning("W123", token, bindingName);
+      }
+      if (stackItem["(labels)"][bindingName]) {
+        warning("W123", token, bindingName);
+      }
+    }
+  }
+
+  function _latedefWarning(type, bindingName, token) {
+    var isFunction;
+
+    if (state.option.latedef) {
+      isFunction = type === "function" || type === "generator function" ||
+        type === "async function";
+
+      // if either latedef is strict and this is a function
+      //    or this is not a function
+      if ((state.option.latedef === true && isFunction) || !isFunction) {
+        warning("W003", token, bindingName);
+      }
+    }
+  }
+
+  var scopeManagerInst = {
+
+    on: function(names, listener) {
+      names.split(" ").forEach(function(name) {
+        emitter.on(name, listener);
+      });
+    },
+
+    isPredefined: function(bindingName) {
+      return !this.has(bindingName) && _.has(_scopeStack[0]["(predefined)"], bindingName);
+    },
+
+    /**
+     * Create a new scope within the current scope. As the topmost value, the
+     * new scope will be interpreted as the current scope until it is
+     * exited--see the `unstack` method.
+     *
+     * @param {string} [type] - The type of the scope. Valid values are
+     *                          "functionparams", "catchparams" and
+     *                          "functionouter"
+     */
+    stack: function(type) {
+      var previousScope = _current;
+      _newScope(type);
+
+      if (!type && previousScope["(type)"] === "functionparams") {
+
+        _current["(isFuncBody)"] = true;
+        _currentFunctBody = _current;
+      }
+    },
+
+    /**
+     * Valldate all binding references and declarations in the current scope
+     * and set the next scope on the stack as the active scope.
+     */
+    unstack: function() {
+      // jshint proto: true
+      var subScope = _scopeStack.length > 1 ? _scopeStack[_scopeStack.length - 2] : null;
+      var isUnstackingFunctionBody = _current === _currentFunctBody,
+        isUnstackingFunctionParams = _current["(type)"] === "functionparams",
+        isUnstackingFunctionOuter = _current["(type)"] === "functionouter";
+
+      var i, j, isImmutable, isFunction;
+      var currentUsages = _current["(usages)"];
+      var currentBindings = _current["(bindings)"];
+      var usedBindingNameList = Object.keys(currentUsages);
+
+      // See comment, "A note on `__proto__`"
+      /* istanbul ignore if */
+      if (currentUsages.__proto__ && usedBindingNameList.indexOf("__proto__") === -1) {
+        usedBindingNameList.push("__proto__");
+      }
+
+      for (i = 0; i < usedBindingNameList.length; i++) {
+        var usedBindingName = usedBindingNameList[i];
+
+        var usage = currentUsages[usedBindingName];
+        var usedBinding = currentBindings[usedBindingName];
+        if (usedBinding) {
+          var usedBindingType = usedBinding["(type)"];
+          isImmutable = usedBindingType === "const" || usedBindingType === "import";
+
+          if (usedBinding["(useOutsideOfScope)"] && !state.option.funcscope) {
+            var usedTokens = usage["(tokens)"];
+            for (j = 0; j < usedTokens.length; j++) {
+              // Keep the consistency of https://github.com/jshint/jshint/issues/2409
+              if (usedBinding["(function)"] === usedTokens[j]["(function)"]) {
+                error("W038", usedTokens[j], usedBindingName);
+              }
+            }
+          }
+
+          // mark the binding used
+          _current["(bindings)"][usedBindingName]["(unused)"] = false;
+
+          // check for modifying a const
+          if (isImmutable && usage["(modified)"]) {
+            for (j = 0; j < usage["(modified)"].length; j++) {
+              error("E013", usage["(modified)"][j], usedBindingName);
+            }
+          }
+
+          isFunction = usedBindingType === "function" ||
+            usedBindingType === "generator function" ||
+            usedBindingType === "async function";
+
+          // check for re-assigning a function declaration
+          if ((isFunction || usedBindingType === "class") && usage["(reassigned)"]) {
+            for (j = 0; j < usage["(reassigned)"].length; j++) {
+              if (!usage["(reassigned)"][j].ignoreW021) {
+                warning("W021", usage["(reassigned)"][j], usedBindingName, usedBindingType);
+              }
+            }
+          }
+          continue;
+        }
+
+        if (subScope) {
+          var bindingType = this.bindingtype(usedBindingName);
+          isImmutable = bindingType === "const" ||
+            (bindingType === null && _scopeStack[0]["(predefined)"][usedBindingName] === false);
+          if (isUnstackingFunctionOuter && !isImmutable) {
+            if (!state.funct["(outerMutables)"]) {
+              state.funct["(outerMutables)"] = [];
+            }
+            state.funct["(outerMutables)"].push(usedBindingName);
+          }
+
+          // not exiting the global scope, so copy the usage down in case its an out of scope usage
+          if (!subScope["(usages)"][usedBindingName]) {
+            subScope["(usages)"][usedBindingName] = usage;
+            if (isUnstackingFunctionBody) {
+              subScope["(usages)"][usedBindingName]["(onlyUsedSubFunction)"] = true;
+            }
+          } else {
+            var subScopeUsage = subScope["(usages)"][usedBindingName];
+            subScopeUsage["(modified)"] = subScopeUsage["(modified)"].concat(usage["(modified)"]);
+            subScopeUsage["(tokens)"] = subScopeUsage["(tokens)"].concat(usage["(tokens)"]);
+            subScopeUsage["(reassigned)"] =
+              subScopeUsage["(reassigned)"].concat(usage["(reassigned)"]);
+          }
+        } else {
+          // this is exiting global scope, so we finalise everything here - we are at the end of the file
+          if (typeof _current["(predefined)"][usedBindingName] === "boolean") {
+
+            // remove the declared token, so we know it is used
+            delete declared[usedBindingName];
+
+            // note it as used so it can be reported
+            usedPredefinedAndGlobals[usedBindingName] = marker;
+
+            // check for re-assigning a read-only (set to false) predefined
+            if (_current["(predefined)"][usedBindingName] === false && usage["(reassigned)"]) {
+              for (j = 0; j < usage["(reassigned)"].length; j++) {
+                if (!usage["(reassigned)"][j].ignoreW020) {
+                  warning("W020", usage["(reassigned)"][j]);
+                }
+              }
+            }
+          }
+          else {
+            // binding usage is not predefined and we have not found a declaration
+            // so report as undeclared
+            for (j = 0; j < usage["(tokens)"].length; j++) {
+              var undefinedToken = usage["(tokens)"][j];
+              // if its not a forgiven undefined (e.g. typof x)
+              if (!undefinedToken.forgiveUndef) {
+                // if undef is on and undef was on when the token was defined
+                if (state.option.undef && !undefinedToken.ignoreUndef) {
+                  warning("W117", undefinedToken, usedBindingName);
+                }
+                if (impliedGlobals[usedBindingName]) {
+                  impliedGlobals[usedBindingName].line.push(undefinedToken.line);
+                } else {
+                  impliedGlobals[usedBindingName] = {
+                    name: usedBindingName,
+                    line: [undefinedToken.line]
+                  };
+                }
+              }
+            }
+          }
+        }
+      }
+
+      // if exiting the global scope, we can warn about declared globals that haven't been used yet
+      if (!subScope) {
+        Object.keys(declared)
+          .forEach(function(bindingNotUsed) {
+            _warnUnused(bindingNotUsed, declared[bindingNotUsed], "var");
+          });
+      }
+
+      // If this is not a function boundary, transfer function-scoped bindings to
+      // the parent block (a rough simulation of variable hoisting). Previously
+      // existing bindings in the parent block should take precedence so that
+      // prior usages are not discarded.
+      if (subScope && !isUnstackingFunctionBody &&
+        !isUnstackingFunctionParams && !isUnstackingFunctionOuter) {
+        var bindingNames = Object.keys(currentBindings);
+        for (i = 0; i < bindingNames.length; i++) {
+
+          var defBindingName = bindingNames[i];
+          var defBinding = currentBindings[defBindingName];
+
+          if (!defBinding["(blockscoped)"] && defBinding["(type)"] !== "exception") {
+            var shadowed = subScope["(bindings)"][defBindingName];
+
+            // Do not overwrite a binding if it exists in the parent scope
+            // because it is shared by adjacent blocks. Copy the `unused`
+            // property so that any references found within the current block
+            // are counted toward that higher-level declaration.
+            if (shadowed) {
+              shadowed["(unused)"] &= defBinding["(unused)"];
+
+            // "Hoist" the variable to the parent block, decorating the binding
+            // so that future references, though technically valid, can be
+            // reported as "out-of-scope" in the absence of the `funcscope`
+            // option.
+            } else {
+              defBinding["(useOutsideOfScope)"] =
+                // Do not warn about out-of-scope usages in the global scope
+                _currentFunctBody["(type)"] !== "global" &&
+                // When a higher scope contains a binding for the binding, the
+                // binding is a re-declaration and should not prompt "used
+                // out-of-scope" warnings.
+                !this.funct.has(defBindingName, { excludeCurrent: true });
+
+              subScope["(bindings)"][defBindingName] = defBinding;
+            }
+
+            delete currentBindings[defBindingName];
+          }
+        }
+      }
+
+      _checkForUnused();
+
+      _scopeStack.pop();
+      if (isUnstackingFunctionBody) {
+        _currentFunctBody = _scopeStack[_.findLastIndex(_scopeStack, function(scope) {
+          // if function or if global (which is at the bottom so it will only return true if we call back)
+          return scope["(isFuncBody)"] || scope["(type)"] === "global";
+        })];
+      }
+
+      _current = subScope;
+    },
+
+    /**
+     * Add a function parameter to the current scope.
+     *
+     * @param {string} bindingName - the value of the identifier
+     * @param {Token} token
+     * @param {string} [type] - binding type; defaults to "param"
+     */
+    addParam: function(bindingName, token, type) {
+      type = type || "param";
+
+      if (type === "exception") {
+        // if defined in the current function
+        var previouslyDefinedBindingType = this.funct.bindingtype(bindingName);
+        if (previouslyDefinedBindingType && previouslyDefinedBindingType !== "exception") {
+          // and has not been used yet in the current function scope
+          if (!state.option.node) {
+            warning("W002", state.tokens.next, bindingName);
+          }
+        }
+
+        if (state.isStrict() && (bindingName === "arguments" || bindingName === "eval")) {
+          warning("E008", token);
+        }
+      }
+
+      // The variable was declared in the current scope
+      if (_.has(_current["(bindings)"], bindingName)) {
+        _current["(bindings)"][bindingName].duplicated = true;
+
+      // The variable was declared in an outer scope
+      } else {
+        // if this scope has the variable defined, it's a re-definition error
+        _checkOuterShadow(bindingName, token);
+
+        _current["(bindings)"][bindingName] = {
+          "(type)" : type,
+          "(token)": token,
+          "(unused)": true };
+
+        _current["(params)"].push(bindingName);
+      }
+
+      if (_.has(_current["(usages)"], bindingName)) {
+        var usage = _current["(usages)"][bindingName];
+        // if its in a sub function it is not necessarily an error, just latedef
+        if (usage["(onlyUsedSubFunction)"]) {
+          _latedefWarning(type, bindingName, token);
+        } else {
+          // this is a clear illegal usage for block scoped variables
+          warning("E056", token, bindingName, type);
+        }
+      }
+    },
+
+    validateParams: function(isArrow) {
+      var isStrict = state.isStrict();
+      var currentFunctParamScope = _currentFunctBody["(parent)"];
+      // From ECMAScript 2017:
+      //
+      // > 14.1.2Static Semantics: Early Errors
+      // >
+      // > [...]
+      // > - It is a Syntax Error if IsSimpleParameterList of
+      // >   FormalParameterList is false and BoundNames of FormalParameterList
+      // >   contains any duplicate elements.
+      var isSimple = state.funct['(hasSimpleParams)'];
+      // Method definitions are defined in terms of UniqueFormalParameters, so
+      // they cannot support duplicate parameter names regardless of strict
+      // mode.
+      var isMethod = state.funct["(method)"];
+
+      if (!currentFunctParamScope["(params)"]) {
+        /* istanbul ignore next */
+        return;
+      }
+
+      currentFunctParamScope["(params)"].forEach(function(bindingName) {
+        var binding = currentFunctParamScope["(bindings)"][bindingName];
+
+        if (binding.duplicated) {
+          if (isStrict || isArrow || isMethod || !isSimple) {
+            warning("E011", binding["(token)"], bindingName);
+          } else if (state.option.shadow !== true) {
+            warning("W004", binding["(token)"], bindingName);
+          }
+        }
+
+        if (isStrict && (bindingName === "arguments" || bindingName === "eval")) {
+          warning("E008", binding["(token)"]);
+        }
+      });
+    },
+
+    getUsedOrDefinedGlobals: function() {
+      // jshint proto: true
+      var list = Object.keys(usedPredefinedAndGlobals);
+
+      // See comment, "A note on `__proto__`"
+      /* istanbul ignore if */
+      if (usedPredefinedAndGlobals.__proto__ === marker &&
+        list.indexOf("__proto__") === -1) {
+        list.push("__proto__");
+      }
+
+      return list;
+    },
+
+    /**
+     * Get an array of implied globals
+     *
+     * @returns {Array.<{ name: string, line: Array.<number>}>}
+     */
+    getImpliedGlobals: function() {
+      // jshint proto: true
+      var values = _.values(impliedGlobals);
+      var hasProto = false;
+
+      // See comment, "A note on `__proto__`"
+      if (impliedGlobals.__proto__) {
+        hasProto = values.some(function(value) {
+          return value.name === "__proto__";
+        });
+
+        /* istanbul ignore if */
+        if (!hasProto) {
+          values.push(impliedGlobals.__proto__);
+        }
+      }
+
+      return values;
+    },
+
+    /**
+     * Get an array of objects describing unused bindings.
+     *
+     * @returns {Array<Object>}
+     */
+    getUnuseds: function() {
+      return unuseds;
+    },
+
+    /**
+     * Determine if a given name has been defined in the current scope or any
+     * lower scope.
+     *
+     * @param {string} bindingName - the value of the identifier
+     *
+     * @return {boolean}
+     */
+    has: function(bindingName) {
+      return Boolean(_getBinding(bindingName));
+    },
+
+    /**
+     * Retrieve binding described by `bindingName` or null
+     *
+     * @param {string} bindingName - the value of the identifier
+     *
+     * @returns {string|null} - the type of the binding or `null` if no such
+     *                          binding exists
+     */
+    bindingtype: function(bindingName) {
+      var scopeBindings = _getBinding(bindingName);
+      if (scopeBindings) {
+        return scopeBindings[bindingName]["(type)"];
+      }
+      return null;
+    },
+
+    /**
+     * For the exported options, indicating a variable is used outside the file
+     *
+     * @param {string} bindingName - the value of the identifier
+     */
+    addExported: function(bindingName) {
+      var globalBindings = _scopeStack[0]["(bindings)"];
+      if (_.has(declared, bindingName)) {
+        // remove the declared token, so we know it is used
+        delete declared[bindingName];
+      } else if (_.has(globalBindings, bindingName)) {
+        globalBindings[bindingName]["(unused)"] = false;
+      } else {
+        for (var i = 1; i < _scopeStack.length; i++) {
+          var scope = _scopeStack[i];
+          // if `scope.(type)` is not defined, it is a block scope
+          if (!scope["(type)"]) {
+            if (_.has(scope["(bindings)"], bindingName) &&
+                !scope["(bindings)"][bindingName]["(blockscoped)"]) {
+              scope["(bindings)"][bindingName]["(unused)"] = false;
+              return;
+            }
+          } else {
+            break;
+          }
+        }
+        exported[bindingName] = true;
+      }
+    },
+
+    /**
+     * Mark a binding as "exported" by an ES2015 module
+     *
+     * @param {string} bindingName - the value of the identifier
+     * @param {object} token
+     */
+    setExported: function(bindingName, token) {
+      this.block.use(bindingName, token);
+    },
+
+    /**
+     * Mark a binding as "initialized." This is necessary to enforce the
+     * "temporal dead zone" (TDZ) of block-scoped bindings which are not
+     * hoisted.
+     *
+     * @param {string} bindingName - the value of the identifier
+     */
+    initialize: function(bindingName) {
+      if (_current["(bindings)"][bindingName]) {
+        _current["(bindings)"][bindingName]["(initialized)"] = true;
+      }
+    },
+
+    /**
+     * Create a new binding and add it to the current scope. Delegates to the
+     * internal `block.add` or `func.add` methods depending on the type.
+     * Produces warnings and errors as necessary.
+     *
+     * @param {string} bindingName
+     * @param {Object} opts
+     * @param {String} opts.type - the type of the binding e.g. "param", "var",
+     *                             "let, "const", "import", "function",
+     *                             "generator function", "async function",
+     *                             "async generator function"
+     * @param {object} opts.token - the token pointing at the declaration
+     * @param {boolean} opts.initialized - whether the binding should be
+     *                                     created in an "initialized" state.
+     */
+    addbinding: function(bindingName, opts) {
+
+      var type  = opts.type;
+      var token = opts.token;
+      var isblockscoped = type === "let" || type === "const" ||
+        type === "class" || type === "import" || type === "generator function" ||
+        type === "async function" || type === "async generator function";
+      var ishoisted = type === "function" || type === "generator function" ||
+        type === "async function" || type === "import";
+      var isexported    = (isblockscoped ? _current : _currentFunctBody)["(type)"] === "global" &&
+                          _.has(exported, bindingName);
+
+      // outer shadow check (inner is only on non-block scoped)
+      _checkOuterShadow(bindingName, token);
+
+      if (state.isStrict() && (bindingName === "arguments" || bindingName === "eval")) {
+        warning("E008", token);
+      }
+
+      if (isblockscoped) {
+
+        var declaredInCurrentScope = _current["(bindings)"][bindingName];
+        // for block scoped variables, params are seen in the current scope as the root function
+        // scope, so check these too.
+        if (!declaredInCurrentScope && _current === _currentFunctBody &&
+          _current["(type)"] !== "global") {
+          declaredInCurrentScope = !!_currentFunctBody["(parent)"]["(bindings)"][bindingName];
+        }
+
+        // if its not already defined (which is an error, so ignore) and is used in TDZ
+        if (!declaredInCurrentScope && _current["(usages)"][bindingName]) {
+          var usage = _current["(usages)"][bindingName];
+          // if its in a sub function it is not necessarily an error, just latedef
+          if (usage["(onlyUsedSubFunction)"] || ishoisted) {
+            _latedefWarning(type, bindingName, token);
+          } else if (!ishoisted) {
+            // this is a clear illegal usage for block scoped variables
+            warning("E056", token, bindingName, type);
+          }
+        }
+
+        // If this scope has already declared a binding with the same name,
+        // then this represents a redeclaration error if:
+        //
+        // 1. it is a "hoisted" block-scoped binding within a block. For
+        //    instance: generator functions may be redeclared in the global
+        //    scope but not within block statements
+        // 2. this is not a "hoisted" block-scoped binding
+        if (declaredInCurrentScope &&
+          (!ishoisted || (_current["(type)"] !== "global" || type === "import"))) {
+          warning("E011", token, bindingName);
+        }
+        else if (state.option.shadow === "outer") {
+
+          // if shadow is outer, for block scope we want to detect any shadowing within this function
+          if (scopeManagerInst.funct.has(bindingName)) {
+            warning("W004", token, bindingName);
+          }
+        }
+
+        scopeManagerInst.block.add(
+          bindingName, type, token, !isexported, opts.initialized
+        );
+
+      } else {
+
+        var declaredInCurrentFunctionScope = scopeManagerInst.funct.has(bindingName);
+
+        // check for late definition, ignore if already declared
+        if (!declaredInCurrentFunctionScope && usedSoFarInCurrentFunction(bindingName)) {
+          _latedefWarning(type, bindingName, token);
+        }
+
+        // defining with a var or a function when a block scope variable of the same name
+        // is in scope is an error
+        if (scopeManagerInst.funct.has(bindingName, { onlyBlockscoped: true })) {
+          warning("E011", token, bindingName);
+        } else if (state.option.shadow !== true) {
+          // now since we didn't get any block scope variables, test for var/function
+          // shadowing
+          if (declaredInCurrentFunctionScope && bindingName !== "__proto__") {
+
+            // see https://github.com/jshint/jshint/issues/2400
+            if (_currentFunctBody["(type)"] !== "global") {
+              warning("W004", token, bindingName);
+            }
+          }
+        }
+
+        scopeManagerInst.funct.add(bindingName, type, token, !isexported);
+
+        if (_currentFunctBody["(type)"] === "global" && !state.impliedClosure()) {
+          usedPredefinedAndGlobals[bindingName] = marker;
+        }
+      }
+    },
+
+    funct: {
+      /**
+       * Return the type of the provided binding given certain options
+       *
+       * @param {string} bindingName
+       * @param {Object=} [options]
+       * @param {boolean} [options.onlyBlockscoped] - only include block scoped
+       *                                              bindings
+       * @param {boolean} [options.excludeParams] - exclude the param scope
+       * @param {boolean} [options.excludeCurrent] - exclude the current scope
+       *
+       * @returns {String}
+       */
+      bindingtype: function(bindingName, options) {
+        var onlyBlockscoped = options && options.onlyBlockscoped;
+        var excludeParams = options && options.excludeParams;
+        var currentScopeIndex = _scopeStack.length - (options && options.excludeCurrent ? 2 : 1);
+        for (var i = currentScopeIndex; i >= 0; i--) {
+          var current = _scopeStack[i];
+          if (current["(bindings)"][bindingName] &&
+            (!onlyBlockscoped || current["(bindings)"][bindingName]["(blockscoped)"])) {
+            return current["(bindings)"][bindingName]["(type)"];
+          }
+          var scopeCheck = excludeParams ? _scopeStack[ i - 1 ] : current;
+          if (scopeCheck && scopeCheck["(type)"] === "functionparams") {
+            return null;
+          }
+        }
+        return null;
+      },
+
+      /**
+       * Determine whether a `break` statement label exists in the function
+       * scope.
+       *
+       * @param {string} labelName - the value of the identifier
+       *
+       * @returns {boolean}
+       */
+      hasLabel: function(labelName) {
+        for (var i = _scopeStack.length - 1; i >= 0; i--) {
+          var current = _scopeStack[i];
+
+          if (current["(labels)"][labelName]) {
+            return true;
+          }
+          if (current["(type)"] === "functionparams") {
+            return false;
+          }
+        }
+        return false;
+      },
+
+      /**
+       * Determine if a given name has been defined in the current function
+       * scope.
+       *
+       * @param {string} bindingName - the value of the identifier
+       * @param {object} options - options as supported by the
+       *                           `funct.bindingtype` method
+       *
+       * @return {boolean}
+       */
+      has: function(bindingName, options) {
+        return Boolean(this.bindingtype(bindingName, options));
+      },
+
+      /**
+       * Create a new function-scoped binding and add it to the current scope.
+       * See the `block.add` method for coresponding logic to create
+       * block-scoped bindings.
+       *
+       * @param {string} bindingName - the value of the identifier
+       * @param {string} type - the type of the binding; either "function" or
+       *                        "var"
+       * @param {object} tok - the token that triggered the definition
+       * @param {boolean} unused - `true` if the binding has not been
+       *                           referenced
+       */
+      add: function(bindingName, type, tok, unused) {
+        _current["(bindings)"][bindingName] = {
+          "(type)" : type,
+          "(token)": tok,
+          "(blockscoped)": false,
+          "(function)": _currentFunctBody,
+          "(unused)": unused };
+      }
+    },
+
+    block: {
+
+      /**
+       * Determine whether the current block scope is the global scope.
+       *
+       * @returns Boolean
+       */
+      isGlobal: function() {
+        return _current["(type)"] === "global";
+      },
+
+      /**
+       * Resolve a reference to a binding and mark the corresponding binding as
+       * "used."
+       *
+       * @param {string} bindingName - the value of the identifier
+       * @param {object} token - the token value that triggered the reference
+       */
+      use: function(bindingName, token) {
+        // If the name resolves to a parameter of the current function, then do
+        // not store usage. This is because in cases such as the following:
+        //
+        //     function(a) {
+        //       var a;
+        //       a = a;
+        //     }
+        //
+        // the usage of `a` will resolve to the parameter, not to the unset
+        // variable binding.
+        var paramScope = _currentFunctBody["(parent)"];
+        if (paramScope && paramScope["(bindings)"][bindingName] &&
+          paramScope["(bindings)"][bindingName]["(type)"] === "param") {
+
+          // then check its not declared by a block scope variable
+          if (!scopeManagerInst.funct.has(bindingName,
+                { excludeParams: true, onlyBlockscoped: true })) {
+            paramScope["(bindings)"][bindingName]["(unused)"] = false;
+          }
+        }
+
+        if (token && (state.ignored.W117 || state.option.undef === false)) {
+          token.ignoreUndef = true;
+        }
+
+        _setupUsages(bindingName);
+
+        _current["(usages)"][bindingName]["(onlyUsedSubFunction)"] = false;
+
+        if (token) {
+          token["(function)"] = _currentFunctBody;
+          _current["(usages)"][bindingName]["(tokens)"].push(token);
+        }
+
+        // Block-scoped bindings can't be used within their initializer due to
+        // "temporal dead zone" (TDZ) restrictions.
+        var binding = _current["(bindings)"][bindingName];
+        if (binding && binding["(blockscoped)"] && !binding["(initialized)"]) {
+          error("E056", token, bindingName, binding["(type)"]);
+        }
+      },
+
+      reassign: function(bindingName, token) {
+        token.ignoreW020 = state.ignored.W020;
+        token.ignoreW021 = state.ignored.W021;
+
+        this.modify(bindingName, token);
+
+        _current["(usages)"][bindingName]["(reassigned)"].push(token);
+      },
+
+      modify: function(bindingName, token) {
+
+        _setupUsages(bindingName);
+
+        _current["(usages)"][bindingName]["(onlyUsedSubFunction)"] = false;
+        _current["(usages)"][bindingName]["(modified)"].push(token);
+      },
+
+      /**
+       * Create a new block-scoped binding and add it to the current scope. See
+       * the `funct.add` method for coresponding logic to create
+       * function-scoped bindings.
+       *
+       * @param {string} bindingName - the value of the identifier
+       * @param {string} type - the type of the binding; one of "class",
+       *                        "const", "function", "import", or "let"
+       * @param {object} tok - the token that triggered the definition
+       * @param {boolean} unused - `true` if the binding has not been
+       *                           referenced
+       * @param {boolean} initialized - `true` if the binding has been
+       *                                initialized (as is the case with
+       *                                bindings created via `import`
+       *                                declarations)
+       */
+      add: function(bindingName, type, tok, unused, initialized) {
+        _current["(bindings)"][bindingName] = {
+          "(type)" : type,
+          "(token)": tok,
+          "(initialized)": !!initialized,
+          "(blockscoped)": true,
+          "(unused)": unused };
+      },
+
+      addLabel: function(labelName, opts) {
+        var token = opts.token;
+        if (scopeManagerInst.funct.hasLabel(labelName)) {
+          warning("E011", token, labelName);
+        }
+        else if (state.option.shadow === "outer") {
+          if (scopeManagerInst.funct.has(labelName)) {
+            warning("W004", token, labelName);
+          } else {
+            _checkOuterShadow(labelName, token);
+          }
+        }
+        _current["(labels)"][labelName] = token;
+      }
+    }
+  };
+  return scopeManagerInst;
+};
+
+module.exports = scopeManager;
+
+},{"events":9,"lodash":16}],24:[function(require,module,exports){
+"use strict";
+var NameStack = require("./name-stack.js");
+
+var state = {
+  syntax: {},
+
+  /**
+   * Determine if the code currently being linted is strict mode code.
+   *
+   * @returns {boolean}
+   */
+  isStrict: function() {
+    return this.directive["use strict"] || this.inClassBody ||
+      this.option.module || this.option.strict === "implied";
+  },
+
+  /**
+   * Determine if the current state warrants a warning for statements outside
+   * of strict mode code.
+   *
+   * While emitting warnings based on function scope would be more intuitive
+   * (and less noisy), JSHint observes statement-based semantics in order to
+   * preserve legacy behavior.
+   *
+   * This method does not take the state of the parser into account, making no
+   * distinction between global code and function code. Because the "missing
+   * 'use strict'" warning is *also* reported at function boundaries, this
+   * function interprets `strict` option values `true` and `undefined` as
+   * equivalent.
+   */
+  stmtMissingStrict: function() {
+    if (this.option.strict === "global") {
+      return true;
+    }
+
+    if (this.option.strict === false) {
+      return false;
+    }
+
+    if (this.option.globalstrict) {
+      return true;
+    }
+
+    return false;
+  },
+
+  allowsGlobalUsd: function() {
+    return this.option.strict === "global" || this.option.globalstrict ||
+      this.option.module || this.impliedClosure();
+  },
+
+  /**
+   * Determine if the current configuration describes an environment that is
+   * wrapped in an immediately-invoked function expression prior to evaluation.
+   *
+   * @returns {boolean}
+   */
+  impliedClosure: function() {
+    return this.option.node || this.option.phantom || this.option.browserify;
+  },
+
+  // Assumption: chronologically ES3 < ES5 < ES6 < Moz
+
+  inMoz: function() {
+    return this.option.moz;
+  },
+
+  /**
+   * Determine if constructs introduced in ECMAScript 10 should be accepted.
+   *
+   * @returns {boolean}
+   */
+  inES10: function() {
+    return this.esVersion >= 10;
+  },
+
+  /**
+   * Determine if constructs introduced in ECMAScript 9 should be accepted.
+   *
+   * @returns {boolean}
+   */
+  inES9: function() {
+    return this.esVersion >= 9;
+  },
+
+  /**
+   * Determine if constructs introduced in ECMAScript 8 should be accepted.
+   *
+   * @returns {boolean}
+   */
+  inES8: function() {
+    return this.esVersion >= 8;
+  },
+
+  /**
+   * Determine if constructs introduced in ECMAScript 7 should be accepted.
+   *
+   * @returns {boolean}
+   */
+  inES7: function() {
+    return this.esVersion >= 7;
+  },
+
+  /**
+   * Determine if constructs introduced in ECMAScript 6 should be accepted.
+   *
+   * @param {boolean} strict - When `true`, do not interpret the `moz` option
+   *                           as ECMAScript 6
+   *
+   * @returns {boolean}
+   */
+  inES6: function(strict) {
+    if (!strict && this.option.moz) {
+      return true;
+    }
+
+    return this.esVersion >= 6;
+  },
+
+  /**
+   * Determine if constructs introduced in ECMAScript 5 should be accepted.
+   *
+   * @returns {boolean}
+   */
+  inES5: function() {
+    return !this.esVersion || this.esVersion >= 5 || this.option.moz;
+  },
+
+  /**
+   * Determine the current version of the input language by inspecting the
+   * value of all ECMAScript-version-related options. This logic is necessary
+   * to ensure compatibility with deprecated options `es3`, `es5`, and
+   * `esnext`, and it may be drastically simplified when those options are
+   * removed.
+   *
+   * @returns {string|null} - the name of any incompatible option detected,
+   *                          `null` otherwise
+   */
+  inferEsVersion: function() {
+    var badOpt = null;
+
+    if (this.option.esversion) {
+      if (this.option.es3) {
+        badOpt = "es3";
+      } else if (this.option.es5) {
+        badOpt = "es5";
+      } else if (this.option.esnext) {
+        badOpt = "esnext";
+      }
+
+      if (badOpt) {
+        return badOpt;
+      }
+
+      if (this.option.esversion === 2015) {
+        this.esVersion = 6;
+      } else {
+        this.esVersion = this.option.esversion;
+      }
+    } else if (this.option.es3) {
+      this.esVersion = 3;
+    } else if (this.option.esnext) {
+      this.esVersion = 6;
+    }
+
+    return null;
+  },
+
+  reset: function() {
+    this.tokens = {
+      prev: null,
+      next: null,
+      curr: null
+    };
+
+    this.option = { unstable: {} };
+    this.esVersion = 5;
+    this.funct = null;
+    this.ignored = {};
+    this.directive = Object.create(null);
+    this.jsonMode = false;
+    this.lines = [];
+    this.tab = "";
+    this.cache = {}; // Node.JS doesn't have Map. Sniff.
+    this.ignoredLines = {};
+    this.forinifcheckneeded = false;
+    this.nameStack = new NameStack();
+    this.inClassBody = false;
+  }
+};
+
+exports.state = state;
+
+},{"./name-stack.js":19}],25:[function(require,module,exports){
+"use strict";
+
+exports.register = function(linter) {
+  // Check for properties named __proto__. This special property was
+  // deprecated and then re-introduced for ES6.
+
+  linter.on("Identifier", function style_scanProto(data) {
+    if (linter.getOption("proto")) {
+      return;
+    }
+
+    if (data.name === "__proto__") {
+      linter.warn("W103", {
+        line: data.line,
+        char: data.char,
+        data: [ data.name, "6" ]
+      });
+    }
+  });
+
+  // Check for properties named __iterator__. This is a special property
+  // available only in browsers with JavaScript 1.7 implementation, but
+  // it is deprecated for ES6
+
+  linter.on("Identifier", function style_scanIterator(data) {
+    if (linter.getOption("iterator")) {
+      return;
+    }
+
+    if (data.name === "__iterator__") {
+      linter.warn("W103", {
+        line: data.line,
+        char: data.char,
+        data: [ data.name ]
+      });
+    }
+  });
+
+  // Check that all identifiers are using camelCase notation.
+  // Exceptions: names like MY_VAR and _myVar.
+
+  linter.on("Identifier", function style_scanCamelCase(data) {
+    if (!linter.getOption("camelcase")) {
+      return;
+    }
+
+    if (data.name.replace(/^_+|_+$/g, "").indexOf("_") > -1 && !data.name.match(/^[A-Z0-9_]*$/)) {
+      linter.warn("W106", {
+        line: data.line,
+        char: data.char,
+        data: [ data.name ]
+      });
+    }
+  });
+
+  // Enforce consistency in style of quoting.
+
+  linter.on("String", function style_scanQuotes(data) {
+    var quotmark = linter.getOption("quotmark");
+    var code;
+
+    if (!quotmark) {
+      return;
+    }
+
+    // If quotmark is set to 'single' warn about all double-quotes.
+
+    if (quotmark === "single" && data.quote !== "'") {
+      code = "W109";
+    }
+
+    // If quotmark is set to 'double' warn about all single-quotes.
+
+    if (quotmark === "double" && data.quote !== "\"") {
+      code = "W108";
+    }
+
+    // If quotmark is set to true, remember the first quotation style
+    // and then warn about all others.
+
+    if (quotmark === true) {
+      if (!linter.getCache("quotmark")) {
+        linter.setCache("quotmark", data.quote);
+      }
+
+      if (linter.getCache("quotmark") !== data.quote) {
+        code = "W110";
+      }
+    }
+
+    if (code) {
+      linter.warn(code, {
+        line: data.line,
+        char: data.char,
+      });
+    }
+  });
+
+  linter.on("Number", function style_scanNumbers(data) {
+    if (data.value.charAt(0) === ".") {
+      // Warn about a leading decimal point.
+      linter.warn("W008", {
+        line: data.line,
+        char: data.char,
+        data: [ data.value ]
+      });
+    }
+
+    if (data.value.substr(data.value.length - 1) === ".") {
+      // Warn about a trailing decimal point.
+      linter.warn("W047", {
+        line: data.line,
+        char: data.char,
+        data: [ data.value ]
+      });
+    }
+
+    if (/^00+/.test(data.value)) {
+      // Multiple leading zeroes.
+      linter.warn("W046", {
+        line: data.line,
+        char: data.char,
+        data: [ data.value ]
+      });
+    }
+  });
+
+  // Warn about script URLs.
+
+  linter.on("String", function style_scanJavaScriptURLs(data) {
+    var re = /^(?:javascript|jscript|ecmascript|vbscript|livescript)\s*:/i;
+
+    if (linter.getOption("scripturl")) {
+      return;
+    }
+
+    if (re.test(data.value)) {
+      linter.warn("W107", {
+        line: data.line,
+        char: data.char
+      });
+    }
+  });
+};
+
+},{}],26:[function(require,module,exports){
+// jshint -W001
+
+"use strict";
+
+// Identifiers provided by the ECMAScript standard.
+
+exports.reservedVars = {
+  NaN       : false,
+  undefined : false
+};
+
+exports.ecmaIdentifiers = {
+  3: {
+    Array              : false,
+    Boolean            : false,
+    Date               : false,
+    decodeURI          : false,
+    decodeURIComponent : false,
+    encodeURI          : false,
+    encodeURIComponent : false,
+    Error              : false,
+    "eval"             : false,
+    EvalError          : false,
+    Function           : false,
+    hasOwnProperty     : false,
+    Infinity           : false,
+    isFinite           : false,
+    isNaN              : false,
+    Math               : false,
+    Number             : false,
+    Object             : false,
+    parseInt           : false,
+    parseFloat         : false,
+    RangeError         : false,
+    ReferenceError     : false,
+    RegExp             : false,
+    String             : false,
+    SyntaxError        : false,
+    TypeError          : false,
+    URIError           : false
+  },
+  5: {
+    JSON               : false
+  },
+  6: {
+    ArrayBuffer        : false,
+    DataView           : false,
+    Float32Array       : false,
+    Float64Array       : false,
+    Int8Array          : false,
+    Int16Array         : false,
+    Int32Array         : false,
+    Map                : false,
+    Promise            : false,
+    Proxy              : false,
+    Reflect            : false,
+    Set                : false,
+    Symbol             : false,
+    Uint8Array         : false,
+    Uint16Array        : false,
+    Uint32Array        : false,
+    Uint8ClampedArray  : false,
+    WeakMap            : false,
+    WeakSet            : false
+  },
+  8: {
+    Atomics            : false,
+    SharedArrayBuffer  : false
+  }
+};
+
+// Global variables commonly provided by a web browser environment.
+
+exports.browser = {
+  Audio                : false,
+  Blob                 : false,
+  addEventListener     : false, // EventTarget
+  applicationCache     : false,
+  atob                 : false, // WindowOrWorkerGlobalScope
+  blur                 : false,
+  btoa                 : false, // WindowOrWorkerGlobalScope
+  cancelAnimationFrame : false,
+  CanvasGradient       : false,
+  CanvasPattern        : false,
+  CanvasRenderingContext2D: false,
+  CSS                  : false,
+  CSSImportRule        : false,
+  CSSGroupingRule      : false,
+  CSSMarginRule        : false,
+  CSSMediaRule         : false,
+  CSSNamespaceRule     : false,
+  CSSPageRule          : false,
+  CSSRule              : false,
+  CSSRuleList          : false,
+  CSSStyleDeclaration  : false,
+  CSSStyleRule         : false,
+  CSSStyleSheet        : false,
+  clearInterval        : false, // WindowOrWorkerGlobalScope
+  clearTimeout         : false, // WindowOrWorkerGlobalScope
+  close                : false,
+  closed               : false,
+  Comment              : false,
+  CompositionEvent     : false,
+  createImageBitmap    : false, // WindowOrWorkerGlobalScope
+  CustomEvent          : false,
+  DOMParser            : false,
+  defaultStatus        : false,
+  dispatchEvent        : false, // EventTarget
+  Document             : false,
+  document             : false,
+  DocumentFragment     : false,
+  Element              : false,
+  ElementTimeControl   : false,
+  Event                : false,
+  event                : false,
+  fetch                : false,
+  File                 : false,
+  FileList             : false,
+  FileReader           : false,
+  FormData             : false,
+  focus                : false,
+  frames               : false,
+  getComputedStyle     : false,
+  Headers              : false,
+  HTMLAnchorElement    : false,
+  HTMLAreaElement      : false,
+  HTMLAudioElement     : false,
+  HTMLBaseElement      : false,
+  HTMLBlockquoteElement: false,
+  HTMLBodyElement      : false,
+  HTMLBRElement        : false,
+  HTMLButtonElement    : false,
+  HTMLCanvasElement    : false,
+  HTMLCollection       : false,
+  HTMLDataElement      : false,
+  HTMLDataListElement  : false,
+  HTMLDetailsElement   : false,
+  HTMLDialogElement    : false,
+  HTMLDirectoryElement : false,
+  HTMLDivElement       : false,
+  HTMLDListElement     : false,
+  HTMLElement          : false,
+  HTMLEmbedElement     : false,
+  HTMLFieldSetElement  : false,
+  HTMLFontElement      : false,
+  HTMLFormElement      : false,
+  HTMLFrameElement     : false,
+  HTMLFrameSetElement  : false,
+  HTMLHeadElement      : false,
+  HTMLHeadingElement   : false,
+  HTMLHRElement        : false,
+  HTMLHtmlElement      : false,
+  HTMLIFrameElement    : false,
+  HTMLImageElement     : false,
+  HTMLInputElement     : false,
+/* HTMLIsIndexElement was removed from the WHATWG HTML spec;
+   see https://github.com/whatwg/html/pull/1095.
+   HTMLIsIndexElement has been removed from browsers; see:
+   • Chromium Removal: https://codereview.chromium.org/96653004/
+   • Gecko Removal: https://bugzilla.mozilla.org/show_bug.cgi?id=1266495
+   • WebKit Removal: https://bugs.webkit.org/show_bug.cgi?id=7139.
+   See also the discussion at https://github.com/jshint/jshint/pull/3222. */
+  HTMLIsIndexElement   : false,
+  HTMLLabelElement     : false,
+  HTMLLayerElement     : false,
+  HTMLLegendElement    : false,
+  HTMLLIElement        : false,
+  HTMLLinkElement      : false,
+  HTMLMapElement       : false,
+  HTMLMarqueeElement   : false,
+  HTMLMediaElement     : false,
+  HTMLMenuElement      : false,
+  HTMLMetaElement      : false,
+  HTMLMeterElement     : false,
+  HTMLModElement       : false,
+  HTMLObjectElement    : false,
+  HTMLOListElement     : false,
+  HTMLOptGroupElement  : false,
+  HTMLOptionElement    : false,
+  HTMLParagraphElement : false,
+  HTMLParamElement     : false,
+  HTMLPictureElement   : false,
+  HTMLPreElement       : false,
+  HTMLProgressElement  : false,
+  HTMLQuoteElement     : false,
+  HTMLScriptElement    : false,
+  HTMLSelectElement    : false,
+  HTMLSlotElement      : false,
+  HTMLSourceElement    : false,
+  HTMLStyleElement     : false,
+  HTMLTableCaptionElement: false,
+  HTMLTableCellElement : false,
+  HTMLTableColElement  : false,
+  HTMLTableElement     : false,
+  HTMLTableRowElement  : false,
+  HTMLTableSectionElement: false,
+  HTMLTemplateElement  : false,
+  HTMLTextAreaElement  : false,
+  HTMLTimeElement      : false,
+  HTMLTitleElement     : false,
+  HTMLTrackElement     : false,
+  HTMLUListElement     : false,
+  HTMLVideoElement     : false,
+  history              : false,
+  Image                : false,
+  IntersectionObserver : false,
+  Intl                 : false,
+  length               : false,
+  localStorage         : false,
+  location             : false,
+  matchMedia           : false,
+  MediaList            : false,
+  MediaRecorder        : false,
+  MessageChannel       : false,
+  MessageEvent         : false,
+  MessagePort          : false,
+  MouseEvent           : false,
+  moveBy               : false,
+  moveTo               : false,
+  MutationObserver     : false,
+  name                 : false,
+  Node                 : false,
+  NodeFilter           : false,
+  NodeList             : false,
+  Notification         : false,
+  navigator            : false,
+  onbeforeunload       : true,
+  onblur               : true,
+  onerror              : true,
+  onfocus              : true,
+  onload               : true,
+  onresize             : true,
+  onunload             : true,
+  open                 : false,
+  openDatabase         : false,
+  opener               : false,
+  Option               : false,
+  origin               : false, // WindowOrWorkerGlobalScope
+  parent               : false,
+  performance          : false,
+  print                : false,
+  queueMicrotask       : false, // WindowOrWorkerGlobalScope
+  Range                : false,
+  requestAnimationFrame : false,
+  removeEventListener  : false, // EventTarget
+  Request              : false,
+  resizeBy             : false,
+  resizeTo             : false,
+  Response             : false,
+  screen               : false,
+  scroll               : false,
+  scrollBy             : false,
+  scrollTo             : false,
+  sessionStorage       : false,
+  setInterval          : false, // WindowOrWorkerGlobalScope
+  setTimeout           : false, // WindowOrWorkerGlobalScope
+  SharedWorker         : false,
+  status               : false,
+  Storage              : false,
+  StyleSheet           : false,
+  SVGAElement          : false,
+  SVGAltGlyphDefElement: false,
+  SVGAltGlyphElement   : false,
+  SVGAltGlyphItemElement: false,
+  SVGAngle             : false,
+  SVGAnimateColorElement: false,
+  SVGAnimateElement    : false,
+  SVGAnimateMotionElement: false,
+  SVGAnimateTransformElement: false,
+  SVGAnimatedAngle     : false,
+  SVGAnimatedBoolean   : false,
+  SVGAnimatedEnumeration: false,
+  SVGAnimatedInteger   : false,
+  SVGAnimatedLength    : false,
+  SVGAnimatedLengthList: false,
+  SVGAnimatedNumber    : false,
+  SVGAnimatedNumberList: false,
+  SVGAnimatedPathData  : false,
+  SVGAnimatedPoints    : false,
+  SVGAnimatedPreserveAspectRatio: false,
+  SVGAnimatedRect      : false,
+  SVGAnimatedString    : false,
+  SVGAnimatedTransformList: false,
+  SVGAnimationElement  : false,
+  SVGCSSRule           : false,
+  SVGCircleElement     : false,
+  SVGClipPathElement   : false,
+  SVGColor             : false,
+  SVGColorProfileElement: false,
+  SVGColorProfileRule  : false,
+  SVGComponentTransferFunctionElement: false,
+  SVGCursorElement     : false,
+  SVGDefsElement       : false,
+  SVGDescElement       : false,
+  SVGDocument          : false,
+  SVGElement           : false,
+  SVGElementInstance   : false,
+  SVGElementInstanceList: false,
+  SVGEllipseElement    : false,
+  SVGExternalResourcesRequired: false,
+  SVGFEBlendElement    : false,
+  SVGFEColorMatrixElement: false,
+  SVGFEComponentTransferElement: false,
+  SVGFECompositeElement: false,
+  SVGFEConvolveMatrixElement: false,
+  SVGFEDiffuseLightingElement: false,
+  SVGFEDisplacementMapElement: false,
+  SVGFEDistantLightElement: false,
+  SVGFEFloodElement    : false,
+  SVGFEFuncAElement    : false,
+  SVGFEFuncBElement    : false,
+  SVGFEFuncGElement    : false,
+  SVGFEFuncRElement    : false,
+  SVGFEGaussianBlurElement: false,
+  SVGFEImageElement    : false,
+  SVGFEMergeElement    : false,
+  SVGFEMergeNodeElement: false,
+  SVGFEMorphologyElement: false,
+  SVGFEOffsetElement   : false,
+  SVGFEPointLightElement: false,
+  SVGFESpecularLightingElement: false,
+  SVGFESpotLightElement: false,
+  SVGFETileElement     : false,
+  SVGFETurbulenceElement: false,
+  SVGFilterElement     : false,
+  SVGFilterPrimitiveStandardAttributes: false,
+  SVGFitToViewBox      : false,
+  SVGFontElement       : false,
+  SVGFontFaceElement   : false,
+  SVGFontFaceFormatElement: false,
+  SVGFontFaceNameElement: false,
+  SVGFontFaceSrcElement: false,
+  SVGFontFaceUriElement: false,
+  SVGForeignObjectElement: false,
+  SVGGElement          : false,
+  SVGGlyphElement      : false,
+  SVGGlyphRefElement   : false,
+  SVGGradientElement   : false,
+  SVGHKernElement      : false,
+  SVGICCColor          : false,
+  SVGImageElement      : false,
+  SVGLangSpace         : false,
+  SVGLength            : false,
+  SVGLengthList        : false,
+  SVGLineElement       : false,
+  SVGLinearGradientElement: false,
+  SVGLocatable         : false,
+  SVGMPathElement      : false,
+  SVGMarkerElement     : false,
+  SVGMaskElement       : false,
+  SVGMatrix            : false,
+  SVGMetadataElement   : false,
+  SVGMissingGlyphElement: false,
+  SVGNumber            : false,
+  SVGNumberList        : false,
+  SVGPaint             : false,
+  SVGPathElement       : false,
+  SVGPathSeg           : false,
+  SVGPathSegArcAbs     : false,
+  SVGPathSegArcRel     : false,
+  SVGPathSegClosePath  : false,
+  SVGPathSegCurvetoCubicAbs: false,
+  SVGPathSegCurvetoCubicRel: false,
+  SVGPathSegCurvetoCubicSmoothAbs: false,
+  SVGPathSegCurvetoCubicSmoothRel: false,
+  SVGPathSegCurvetoQuadraticAbs: false,
+  SVGPathSegCurvetoQuadraticRel: false,
+  SVGPathSegCurvetoQuadraticSmoothAbs: false,
+  SVGPathSegCurvetoQuadraticSmoothRel: false,
+  SVGPathSegLinetoAbs  : false,
+  SVGPathSegLinetoHorizontalAbs: false,
+  SVGPathSegLinetoHorizontalRel: false,
+  SVGPathSegLinetoRel  : false,
+  SVGPathSegLinetoVerticalAbs: false,
+  SVGPathSegLinetoVerticalRel: false,
+  SVGPathSegList       : false,
+  SVGPathSegMovetoAbs  : false,
+  SVGPathSegMovetoRel  : false,
+  SVGPatternElement    : false,
+  SVGPoint             : false,
+  SVGPointList         : false,
+  SVGPolygonElement    : false,
+  SVGPolylineElement   : false,
+  SVGPreserveAspectRatio: false,
+  SVGRadialGradientElement: false,
+  SVGRect              : false,
+  SVGRectElement       : false,
+  SVGRenderingIntent   : false,
+  SVGSVGElement        : false,
+  SVGScriptElement     : false,
+  SVGSetElement        : false,
+  SVGStopElement       : false,
+  SVGStringList        : false,
+  SVGStylable          : false,
+  SVGStyleElement      : false,
+  SVGSwitchElement     : false,
+  SVGSymbolElement     : false,
+  SVGTRefElement       : false,
+  SVGTSpanElement      : false,
+  SVGTests             : false,
+  SVGTextContentElement: false,
+  SVGTextElement       : false,
+  SVGTextPathElement   : false,
+  SVGTextPositioningElement: false,
+  SVGTitleElement      : false,
+  SVGTransform         : false,
+  SVGTransformList     : false,
+  SVGTransformable     : false,
+  SVGURIReference      : false,
+  SVGUnitTypes         : false,
+  SVGUseElement        : false,
+  SVGVKernElement      : false,
+  SVGViewElement       : false,
+  SVGViewSpec          : false,
+  SVGZoomAndPan        : false,
+  Text                 : false,
+  TextDecoder          : false,
+  TextEncoder          : false,
+  TimeEvent            : false,
+  top                  : false,
+  URL                  : false,
+  WebGLActiveInfo      : false,
+  WebGLBuffer          : false,
+  WebGLContextEvent    : false,
+  WebGLFramebuffer     : false,
+  WebGLProgram         : false,
+  WebGLRenderbuffer    : false,
+  WebGLRenderingContext: false,
+  WebGLShader          : false,
+  WebGLShaderPrecisionFormat: false,
+  WebGLTexture         : false,
+  WebGLUniformLocation : false,
+  WebSocket            : false,
+  window               : false,
+  Window               : false,
+  Worker               : false,
+  XDomainRequest       : false,
+  XMLDocument          : false,
+  XMLHttpRequest       : false,
+  XMLSerializer        : false,
+  XPathEvaluator       : false,
+  XPathException       : false,
+  XPathExpression      : false,
+  XPathNamespace       : false,
+  XPathNSResolver      : false,
+  XPathResult          : false
+};
+
+exports.devel = {
+  alert  : false,
+  confirm: false,
+  console: false,
+  Debug  : false,
+  opera  : false,
+  prompt : false
+};
+
+exports.worker = {
+  addEventListener    : true, // EventTarget
+  atob                : true, // WindowOrWorkerGlobalScope
+  btoa                : true, // WindowOrWorkerGlobalScope
+  clearInterval       : true, // WindowOrWorkerGlobalScope
+  clearTimeout        : true, // WindowOrWorkerGlobalScope
+  createImageBitmap   : true, // WindowOrWorkerGlobalScope
+  dispatchEvent       : true, // EventTarget
+  importScripts       : true,
+  onmessage           : true,
+  origin              : true, // WindowOrWorkerGlobalScope
+  postMessage         : true,
+  queueMicrotask      : true, // WindowOrWorkerGlobalScope
+  removeEventListener : true, // EventTarget
+  self                : true,
+  setInterval         : true, // WindowOrWorkerGlobalScope
+  setTimeout          : true, // WindowOrWorkerGlobalScope
+  FileReaderSync      : true
+};
+
+// Widely adopted global names that are not part of ECMAScript standard
+exports.nonstandard = {
+  escape  : false,
+  unescape: false
+};
+
+// Globals provided by popular JavaScript environments.
+
+exports.couch = {
+  "require" : false,
+  respond   : false,
+  getRow    : false,
+  emit      : false,
+  send      : false,
+  start     : false,
+  sum       : false,
+  log       : false,
+  exports   : false,
+  module    : false,
+  provides  : false
+};
+
+exports.node = {
+  __filename    : false,
+  __dirname     : false,
+  arguments     : false,
+  GLOBAL        : false,
+  global        : false,
+  module        : false,
+  require       : false,
+
+  // These globals are writeable because Node allows the following
+  // usage pattern: var Buffer = require("buffer").Buffer;
+
+  Buffer        : true,
+  console       : true,
+  exports       : true,
+  process       : true,
+  setTimeout    : true,
+  clearTimeout  : true,
+  setInterval   : true,
+  clearInterval : true,
+  setImmediate  : true, // v0.9.1+
+  clearImmediate: true  // v0.9.1+
+};
+
+exports.browserify = {
+  __filename    : false,
+  __dirname     : false,
+  global        : false,
+  module        : false,
+  require       : false,
+  Buffer        : true,
+  exports       : true,
+  process       : true
+};
+
+exports.phantom = {
+  phantom      : true,
+  require      : true,
+  WebPage      : true,
+  console      : true, // in examples, but undocumented
+  exports      : true  // v1.7+
+};
+
+exports.qunit = {
+  asyncTest      : false,
+  deepEqual      : false,
+  equal          : false,
+  expect         : false,
+  module         : false,
+  notDeepEqual   : false,
+  notEqual       : false,
+  notOk          : false,
+  notPropEqual   : false,
+  notStrictEqual : false,
+  ok             : false,
+  propEqual      : false,
+  QUnit          : false,
+  raises         : false,
+  start          : false,
+  stop           : false,
+  strictEqual    : false,
+  test           : false,
+  "throws"       : false
+};
+
+exports.rhino = {
+  arguments    : false,
+  defineClass  : false,
+  deserialize  : false,
+  gc           : false,
+  help         : false,
+  importClass  : false,
+  importPackage: false,
+  "java"       : false,
+  load         : false,
+  loadClass    : false,
+  Packages     : false,
+  print        : false,
+  quit         : false,
+  readFile     : false,
+  readUrl      : false,
+  runCommand   : false,
+  seal         : false,
+  serialize    : false,
+  spawn        : false,
+  sync         : false,
+  toint32      : false,
+  version      : false
+};
+
+exports.shelljs = {
+  target       : false,
+  echo         : false,
+  exit         : false,
+  cd           : false,
+  pwd          : false,
+  ls           : false,
+  find         : false,
+  cp           : false,
+  rm           : false,
+  mv           : false,
+  mkdir        : false,
+  test         : false,
+  cat          : false,
+  sed          : false,
+  grep         : false,
+  which        : false,
+  dirs         : false,
+  pushd        : false,
+  popd         : false,
+  env          : false,
+  exec         : false,
+  chmod        : false,
+  config       : false,
+  error        : false,
+  tempdir      : false
+};
+
+exports.typed = {
+  ArrayBuffer         : false,
+  ArrayBufferView     : false,
+  DataView            : false,
+  Float32Array        : false,
+  Float64Array        : false,
+  Int16Array          : false,
+  Int32Array          : false,
+  Int8Array           : false,
+  Uint16Array         : false,
+  Uint32Array         : false,
+  Uint8Array          : false,
+  Uint8ClampedArray   : false
+};
+
+exports.wsh = {
+  ActiveXObject            : true,
+  Enumerator               : true,
+  GetObject                : true,
+  ScriptEngine             : true,
+  ScriptEngineBuildVersion : true,
+  ScriptEngineMajorVersion : true,
+  ScriptEngineMinorVersion : true,
+  VBArray                  : true,
+  WSH                      : true,
+  WScript                  : true,
+  XDomainRequest           : true
+};
+
+// Globals provided by popular JavaScript libraries.
+
+exports.dojo = {
+  dojo     : false,
+  dijit    : false,
+  dojox    : false,
+  define   : false,
+  "require": false
+};
+
+exports.jquery = {
+  "$"    : false,
+  jQuery : false
+};
+
+exports.mootools = {
+  "$"           : false,
+  "$$"          : false,
+  Asset         : false,
+  Browser       : false,
+  Chain         : false,
+  Class         : false,
+  Color         : false,
+  Cookie        : false,
+  Core          : false,
+  Document      : false,
+  DomReady      : false,
+  DOMEvent      : false,
+  DOMReady      : false,
+  Drag          : false,
+  Element       : false,
+  Elements      : false,
+  Event         : false,
+  Events        : false,
+  Fx            : false,
+  Group         : false,
+  Hash          : false,
+  HtmlTable     : false,
+  IFrame        : false,
+  IframeShim    : false,
+  InputValidator: false,
+  instanceOf    : false,
+  Keyboard      : false,
+  Locale        : false,
+  Mask          : false,
+  MooTools      : false,
+  Native        : false,
+  Options       : false,
+  OverText      : false,
+  Request       : false,
+  Scroller      : false,
+  Slick         : false,
+  Slider        : false,
+  Sortables     : false,
+  Spinner       : false,
+  Swiff         : false,
+  Tips          : false,
+  Type          : false,
+  typeOf        : false,
+  URI           : false,
+  Window        : false
+};
+
+exports.prototypejs = {
+  "$"               : false,
+  "$$"              : false,
+  "$A"              : false,
+  "$F"              : false,
+  "$H"              : false,
+  "$R"              : false,
+  "$break"          : false,
+  "$continue"       : false,
+  "$w"              : false,
+  Abstract          : false,
+  Ajax              : false,
+  Class             : false,
+  Enumerable        : false,
+  Element           : false,
+  Event             : false,
+  Field             : false,
+  Form              : false,
+  Hash              : false,
+  Insertion         : false,
+  ObjectRange       : false,
+  PeriodicalExecuter: false,
+  Position          : false,
+  Prototype         : false,
+  Selector          : false,
+  Template          : false,
+  Toggle            : false,
+  Try               : false,
+  Autocompleter     : false,
+  Builder           : false,
+  Control           : false,
+  Draggable         : false,
+  Draggables        : false,
+  Droppables        : false,
+  Effect            : false,
+  Sortable          : false,
+  SortableObserver  : false,
+  Sound             : false,
+  Scriptaculous     : false
+};
+
+exports.yui = {
+  YUI       : false,
+  Y         : false,
+  YUI_config: false
+};
+
+exports.mocha = {
+  // Global (for config etc.)
+  mocha       : false,
+  // BDD
+  describe    : false,
+  xdescribe   : false,
+  it          : false,
+  xit         : false,
+  context     : false,
+  xcontext    : false,
+  before      : false,
+  after       : false,
+  beforeEach  : false,
+  afterEach   : false,
+  // TDD
+  suite         : false,
+  test          : false,
+  setup         : false,
+  teardown      : false,
+  suiteSetup    : false,
+  suiteTeardown : false
+};
+
+exports.jasmine = {
+  jasmine     : false,
+  describe    : false,
+  xdescribe   : false,
+  it          : false,
+  xit         : false,
+  beforeEach  : false,
+  afterEach   : false,
+  setFixtures : false,
+  loadFixtures: false,
+  spyOn       : false,
+  expect      : false,
+  // Jasmine 1.3
+  runs        : false,
+  waitsFor    : false,
+  waits       : false,
+  // Jasmine 2.1
+  beforeAll   : false,
+  afterAll    : false,
+  fail        : false,
+  fdescribe   : false,
+  fit         : false,
+  pending     : false,
+  // Jasmine 2.6
+  spyOnProperty: false
+};
+
+},{}],"jshint":[function(require,module,exports){
+/*!
+ * JSHint, by JSHint Community.
+ *
+ * Licensed under the MIT license.
+ *
+ * JSHint is a derivative work of JSLint:
+ *
+ *   Copyright (c) 2002 Douglas Crockford  (www.JSLint.com)
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining
+ *   a copy of this software and associated documentation files (the "Software"),
+ *   to deal in the Software without restriction, including without limitation
+ *   the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ *   and/or sell copies of the Software, and to permit persons to whom
+ *   the Software is furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included
+ *   in all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ *   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ *   DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+/*jshint quotmark:double */
+/*exported console */
+
+var _            = require("lodash");
+var events       = require("events");
+var vars         = require("./vars.js");
+var messages     = require("./messages.js");
+var Lexer        = require("./lex.js").Lexer;
+var reg          = require("./reg.js");
+var state        = require("./state.js").state;
+var style        = require("./style.js");
+var options      = require("./options.js");
+var scopeManager = require("./scope-manager.js");
+var prodParams   = require("./prod-params.js");
+
+// We need this module here because environments such as IE and Rhino
+// don't necessarilly expose the 'console' API and browserify uses
+// it to log things. It's a sad state of affair, really.
+var console = require("console-browserify");
+
+// We build the application inside a function so that we produce only a singleton
+// variable. That function will be invoked immediately, and its return value is
+// the JSHINT function itself.
+
+var JSHINT = (function() {
+  "use strict";
+
+  var api, // Extension API
+
+    // These are operators that should not be used with the ! operator.
+    bang = {
+      "<"  : true,
+      "<=" : true,
+      "==" : true,
+      "===": true,
+      "!==": true,
+      "!=" : true,
+      ">"  : true,
+      ">=" : true,
+      "+"  : true,
+      "-"  : true,
+      "*"  : true,
+      "/"  : true,
+      "%"  : true
+    },
+
+    declared, // Globals that were declared using /*global ... */ syntax.
+
+    functions, // All of the functions
+
+    inblock,
+    indent,
+    lookahead,
+    lex,
+    member,
+    membersOnly,
+    predefined,    // Global variables defined by option
+
+    extraModules = [],
+    emitter = new events.EventEmitter();
+
+  function checkOption(name, isStable, t) {
+    var type, validNames;
+
+    if (isStable) {
+      type = "";
+      validNames = options.validNames;
+    } else {
+      type = "unstable ";
+      validNames = options.unstableNames;
+    }
+
+    name = name.trim();
+
+    if (/^[+-]W\d{3}$/g.test(name)) {
+      return true;
+    }
+
+    if (validNames.indexOf(name) === -1) {
+      if (t.type !== "jslint" && !_.has(options.removed, name)) {
+        error("E001", t, type, name);
+        return false;
+      }
+    }
+
+    return true;
+  }
+
+  function isString(obj) {
+    return Object.prototype.toString.call(obj) === "[object String]";
+  }
+
+  function isIdentifier(tkn, value) {
+    if (!tkn)
+      return false;
+
+    if (!tkn.identifier || tkn.value !== value)
+      return false;
+
+    return true;
+  }
+
+  /**
+   * ES3 defined a set of "FutureReservedWords" in order "to allow for the
+   * possibility of future adoption of [proposed] extensions."
+   *
+   * ES5 reduced the set of FutureReservedWords, in some cases by using them to
+   * define new syntactic forms (e.g. `class` and `const`) and in other cases
+   * by simply allowing their use as Identifiers (e.g. `int` and `goto`).
+   * Separately, ES5 introduced new restrictions on certain tokens, but limited
+   * the restriction to strict mode code (e.g. `let` and `yield`).
+   *
+   * This function determines if a given token describes a reserved word
+   * according to the current state of the parser.
+   *
+   * @param {number} context - the parsing context; see `prod-params.js` for
+   *                           more information
+   * @param {Token} token
+   */
+  function isReserved(context, token) {
+    if (!token.reserved) {
+      return false;
+    }
+    var meta = token.meta;
+
+    if (meta && meta.isFutureReservedWord) {
+      if (state.inES5()) {
+        // ES3 FutureReservedWord in an ES5 environment.
+        if (!meta.es5) {
+          return false;
+        }
+
+        if (token.isProperty) {
+          return false;
+        }
+      }
+    } else if (meta && meta.es5 && !state.inES5()) {
+      return false;
+    }
+
+    // Some identifiers are reserved only within a strict mode environment.
+    if (meta && meta.strictOnly && state.inES5()) {
+      if (!state.option.strict && !state.isStrict()) {
+        return false;
+      }
+    }
+
+    if (token.id === "await" && (!(context & prodParams.async) && !state.option.module)) {
+      return false;
+    }
+
+    if (token.id === "yield" && (!(context & prodParams.yield))) {
+      return state.isStrict();
+    }
+
+    return true;
+  }
+
+  function supplant(str, data) {
+    return str.replace(/\{([^{}]*)\}/g, function(a, b) {
+      var r = data[b];
+      return typeof r === "string" || typeof r === "number" ? r : a;
+    });
+  }
+
+  function combine(dest, src) {
+    Object.keys(src).forEach(function(name) {
+      if (_.has(JSHINT.blacklist, name)) return;
+      dest[name] = src[name];
+    });
+  }
+
+  function processenforceall() {
+    if (state.option.enforceall) {
+      for (var enforceopt in options.bool.enforcing) {
+        if (state.option[enforceopt] === undefined &&
+            !options.noenforceall[enforceopt]) {
+          state.option[enforceopt] = true;
+        }
+      }
+      for (var relaxopt in options.bool.relaxing) {
+        if (state.option[relaxopt] === undefined) {
+          state.option[relaxopt] = false;
+        }
+      }
+    }
+  }
+
+  /**
+   * Apply all linting options according to the status of the `state` object.
+   */
+  function applyOptions() {
+    var badESOpt = null;
+    processenforceall();
+
+    /**
+     * TODO: Remove in JSHint 3
+     */
+    badESOpt = state.inferEsVersion();
+    if (badESOpt) {
+      quit("E059", state.tokens.next, "esversion", badESOpt);
+    }
+
+    if (state.inES5()) {
+      combine(predefined, vars.ecmaIdentifiers[5]);
+    }
+
+    if (state.inES6()) {
+      combine(predefined, vars.ecmaIdentifiers[6]);
+    }
+
+    if (state.inES8()) {
+      combine(predefined, vars.ecmaIdentifiers[8]);
+    }
+
+    /**
+     * Use `in` to check for the presence of any explicitly-specified value for
+     * `globalstrict` because both `true` and `false` should trigger an error.
+     */
+    if (state.option.strict === "global" && "globalstrict" in state.option) {
+      quit("E059", state.tokens.next, "strict", "globalstrict");
+    }
+
+    if (state.option.module) {
+      /**
+       * TODO: Extend this restriction to *all* ES6-specific options.
+       */
+      if (!state.inES6()) {
+        warning("W134", state.tokens.next, "module", 6);
+      }
+    }
+
+    if (state.option.regexpu) {
+      /**
+       * TODO: Extend this restriction to *all* ES6-specific options.
+       */
+      if (!state.inES6()) {
+        warning("W134", state.tokens.next, "regexpu", 6);
+      }
+    }
+
+    if (state.option.couch) {
+      combine(predefined, vars.couch);
+    }
+
+    if (state.option.qunit) {
+      combine(predefined, vars.qunit);
+    }
+
+    if (state.option.rhino) {
+      combine(predefined, vars.rhino);
+    }
+
+    if (state.option.shelljs) {
+      combine(predefined, vars.shelljs);
+      combine(predefined, vars.node);
+    }
+    if (state.option.typed) {
+      combine(predefined, vars.typed);
+    }
+
+    if (state.option.phantom) {
+      combine(predefined, vars.phantom);
+    }
+
+    if (state.option.prototypejs) {
+      combine(predefined, vars.prototypejs);
+    }
+
+    if (state.option.node) {
+      combine(predefined, vars.node);
+      combine(predefined, vars.typed);
+    }
+
+    if (state.option.devel) {
+      combine(predefined, vars.devel);
+    }
+
+    if (state.option.dojo) {
+      combine(predefined, vars.dojo);
+    }
+
+    if (state.option.browser) {
+      combine(predefined, vars.browser);
+      combine(predefined, vars.typed);
+    }
+
+    if (state.option.browserify) {
+      combine(predefined, vars.browser);
+      combine(predefined, vars.typed);
+      combine(predefined, vars.browserify);
+    }
+
+    if (state.option.nonstandard) {
+      combine(predefined, vars.nonstandard);
+    }
+
+    if (state.option.jasmine) {
+      combine(predefined, vars.jasmine);
+    }
+
+    if (state.option.jquery) {
+      combine(predefined, vars.jquery);
+    }
+
+    if (state.option.mootools) {
+      combine(predefined, vars.mootools);
+    }
+
+    if (state.option.worker) {
+      combine(predefined, vars.worker);
+    }
+
+    if (state.option.wsh) {
+      combine(predefined, vars.wsh);
+    }
+
+    if (state.option.yui) {
+      combine(predefined, vars.yui);
+    }
+
+    if (state.option.mocha) {
+      combine(predefined, vars.mocha);
+    }
+  }
+
+  // Produce an error warning.
+  function quit(code, token, a, b) {
+    var percentage = Math.floor((token.line / state.lines.length) * 100);
+    var message = messages.errors[code].desc;
+
+    var exception = {
+      name: "JSHintError",
+      line: token.line,
+      character: token.from,
+      message: message + " (" + percentage + "% scanned).",
+      raw: message,
+      code: code,
+      a: a,
+      b: b
+    };
+
+    exception.reason = supplant(message, exception) + " (" + percentage +
+      "% scanned).";
+
+    throw exception;
+  }
+
+  function removeIgnoredMessages() {
+    var ignored = state.ignoredLines;
+
+    if (_.isEmpty(ignored)) return;
+    JSHINT.errors = _.reject(JSHINT.errors, function(err) { return ignored[err.line] });
+  }
+
+  function warning(code, t, a, b, c, d) {
+    var ch, l, w, msg;
+
+    if (/^W\d{3}$/.test(code)) {
+      if (state.ignored[code])
+        return;
+
+      msg = messages.warnings[code];
+    } else if (/E\d{3}/.test(code)) {
+      msg = messages.errors[code];
+    } else if (/I\d{3}/.test(code)) {
+      msg = messages.info[code];
+    }
+
+    t = t || state.tokens.next || {};
+    if (t.id === "(end)") {  // `~
+      t = state.tokens.curr;
+    }
+
+    l = t.line;
+    ch = t.from;
+
+    w = {
+      id: "(error)",
+      raw: msg.desc,
+      code: msg.code,
+      evidence: state.lines[l - 1] || "",
+      line: l,
+      character: ch,
+      scope: JSHINT.scope,
+      a: a,
+      b: b,
+      c: c,
+      d: d
+    };
+
+    w.reason = supplant(msg.desc, w);
+    JSHINT.errors.push(w);
+
+    removeIgnoredMessages();
+
+    if (JSHINT.errors.length >= state.option.maxerr)
+      quit("E043", t);
+
+    return w;
+  }
+
+  function warningAt(m, l, ch, a, b, c, d) {
+    return warning(m, {
+      line: l,
+      from: ch
+    }, a, b, c, d);
+  }
+
+  function error(m, t, a, b, c, d) {
+    warning(m, t, a, b, c, d);
+  }
+
+  function errorAt(m, l, ch, a, b, c, d) {
+    return error(m, {
+      line: l,
+      from: ch
+    }, a, b, c, d);
+  }
+
+  // Tracking of "internal" scripts, like eval containing a static string
+  function addEvalCode(elem, token) {
+    JSHINT.internals.push({
+      id: "(internal)",
+      elem: elem,
+      token: token,
+      code: token.value.replace(/([^\\])(\\*)\2\\n/g, "$1\n")
+    });
+  }
+
+  /**
+   * Process an inline linting directive
+   *
+   * @param {Token} directiveToken - the directive-bearing comment token
+   * @param {Token} previous - the token that preceeds the directive
+   */
+  function lintingDirective(directiveToken, previous) {
+    var body = directiveToken.body.split(",")
+      .map(function(s) { return s.trim(); });
+    var predef = {};
+
+    if (directiveToken.type === "falls through") {
+      previous.caseFallsThrough = true;
+      return;
+    }
+
+    if (directiveToken.type === "globals") {
+      body.forEach(function(item, idx) {
+        var parts = item.split(":");
+        var key = parts[0].trim();
+
+        if (key === "-" || !key.length) {
+          // Ignore trailing comma
+          if (idx > 0 && idx === body.length - 1) {
+            return;
+          }
+          error("E002", directiveToken);
+          return;
+        }
+
+        if (key.charAt(0) === "-") {
+          key = key.slice(1);
+
+          JSHINT.blacklist[key] = key;
+          delete predefined[key];
+        } else {
+          predef[key] = parts.length > 1 && parts[1].trim() === "true";
+        }
+      });
+
+      combine(predefined, predef);
+
+      for (var key in predef) {
+        if (_.has(predef, key)) {
+          declared[key] = directiveToken;
+        }
+      }
+    }
+
+    if (directiveToken.type === "exported") {
+      body.forEach(function(e, idx) {
+        if (!e.length) {
+          // Ignore trailing comma
+          if (idx > 0 && idx === body.length - 1) {
+            return;
+          }
+          error("E002", directiveToken);
+          return;
+        }
+
+        state.funct["(scope)"].addExported(e);
+      });
+    }
+
+    if (directiveToken.type === "members") {
+      membersOnly = membersOnly || {};
+
+      body.forEach(function(m) {
+        var ch1 = m.charAt(0);
+        var ch2 = m.charAt(m.length - 1);
+
+        if (ch1 === ch2 && (ch1 === "\"" || ch1 === "'")) {
+          m = m
+            .substr(1, m.length - 2)
+            .replace("\\\"", "\"");
+        }
+
+        membersOnly[m] = false;
+      });
+    }
+
+    var numvals = [
+      "maxstatements",
+      "maxparams",
+      "maxdepth",
+      "maxcomplexity",
+      "maxerr",
+      "maxlen",
+      "indent"
+    ];
+
+    if (directiveToken.type === "jshint" || directiveToken.type === "jslint" ||
+      directiveToken.type === "jshint.unstable") {
+      body.forEach(function(item) {
+        var parts = item.split(":");
+        var key = parts[0].trim();
+        var val = parts.length > 1 ? parts[1].trim() : "";
+        var numberVal;
+
+        if (!checkOption(key, directiveToken.type !== "jshint.unstable", directiveToken)) {
+          return;
+        }
+
+        if (numvals.indexOf(key) >= 0) {
+          // GH988 - numeric options can be disabled by setting them to `false`
+          if (val !== "false") {
+            numberVal = +val;
+
+            if (typeof numberVal !== "number" || !isFinite(numberVal) ||
+              numberVal <= 0 || Math.floor(numberVal) !== numberVal) {
+              error("E032", directiveToken, val);
+              return;
+            }
+
+            state.option[key] = numberVal;
+          } else {
+            state.option[key] = key === "indent" ? 4 : false;
+          }
+
+          return;
+        }
+
+        if (key === "validthis") {
+          // `validthis` is valid only within a function scope.
+
+          if (state.funct["(global)"])
+            return void error("E009");
+
+          if (val !== "true" && val !== "false")
+            return void error("E002", directiveToken);
+
+          state.option.validthis = (val === "true");
+          return;
+        }
+
+        if (key === "quotmark") {
+          switch (val) {
+          case "true":
+          case "false":
+            state.option.quotmark = (val === "true");
+            break;
+          case "double":
+          case "single":
+            state.option.quotmark = val;
+            break;
+          default:
+            error("E002", directiveToken);
+          }
+          return;
+        }
+
+        if (key === "shadow") {
+          switch (val) {
+          case "true":
+            state.option.shadow = true;
+            break;
+          case "outer":
+            state.option.shadow = "outer";
+            break;
+          case "false":
+          case "inner":
+            state.option.shadow = "inner";
+            break;
+          default:
+            error("E002", directiveToken);
+          }
+          return;
+        }
+
+        if (key === "unused") {
+          switch (val) {
+          case "true":
+            state.option.unused = true;
+            break;
+          case "false":
+            state.option.unused = false;
+            break;
+          case "vars":
+          case "strict":
+            state.option.unused = val;
+            break;
+          default:
+            error("E002", directiveToken);
+          }
+          return;
+        }
+
+        if (key === "latedef") {
+          switch (val) {
+          case "true":
+            state.option.latedef = true;
+            break;
+          case "false":
+            state.option.latedef = false;
+            break;
+          case "nofunc":
+            state.option.latedef = "nofunc";
+            break;
+          default:
+            error("E002", directiveToken);
+          }
+          return;
+        }
+
+        if (key === "ignore") {
+          switch (val) {
+          case "line":
+            state.ignoredLines[directiveToken.line] = true;
+            removeIgnoredMessages();
+            break;
+          default:
+            error("E002", directiveToken);
+          }
+          return;
+        }
+
+        if (key === "strict") {
+          switch (val) {
+          case "true":
+            state.option.strict = true;
+            break;
+          case "false":
+            state.option.strict = false;
+            break;
+          case "global":
+          case "implied":
+            state.option.strict = val;
+            break;
+          default:
+            error("E002", directiveToken);
+          }
+          return;
+        }
+
+        if (key === "module") {
+          /**
+           * TODO: Extend this restriction to *all* "environmental" options.
+           */
+          if (!hasParsedCode(state.funct)) {
+            error("E055", directiveToken, "module");
+          }
+        }
+
+        if (key === "esversion") {
+          switch (val) {
+          case "3":
+          case "5":
+          case "6":
+          case "7":
+          case "8":
+          case "9":
+          case "10":
+            state.option.moz = false;
+            state.option.esversion = +val;
+            break;
+          case "2015":
+          case "2016":
+          case "2017":
+          case "2018":
+          case "2019":
+            state.option.moz = false;
+            // Translate specification publication year to version number.
+            state.option.esversion = +val - 2009;
+            break;
+          default:
+            error("E002", directiveToken);
+          }
+          if (!hasParsedCode(state.funct)) {
+            error("E055", directiveToken, "esversion");
+          }
+          return;
+        }
+
+        var match = /^([+-])(W\d{3})$/g.exec(key);
+        if (match) {
+          // ignore for -W..., unignore for +W...
+          state.ignored[match[2]] = (match[1] === "-");
+          return;
+        }
+
+        var tn;
+        if (val === "true" || val === "false") {
+          if (directiveToken.type === "jslint") {
+            tn = options.renamed[key] || key;
+            state.option[tn] = (val === "true");
+
+            if (options.inverted[tn] !== undefined) {
+              state.option[tn] = !state.option[tn];
+            }
+          } else if (directiveToken.type === "jshint.unstable") {
+            state.option.unstable[key] = (val === "true");
+          } else {
+            state.option[key] = (val === "true");
+          }
+
+          return;
+        }
+
+        error("E002", directiveToken);
+      });
+
+      applyOptions();
+    }
+  }
+
+  /**
+   * Return a token beyond the token available in `state.tokens.next`. If no
+   * such token exists, return the "(end)" token. This function is used to
+   * determine parsing strategies in cases where the value of the next token
+   * does not provide sufficient information, as is the case with `for` loops,
+   * e.g.:
+   *
+   *     for ( var i in ...
+   *
+   * versus:
+   *
+   *     for ( var i = ...
+   *
+   * @param {number} [p] - offset of desired token; defaults to 0
+   *
+   * @returns {token}
+   */
+  function peek(p) {
+    var i = p || 0, j = lookahead.length, t;
+
+    if (i < j) {
+      return lookahead[i];
+    }
+
+    while (j <= i) {
+      t = lex.token();
+
+      // When the lexer is exhausted, this function should produce the "(end)"
+      // token, even in cases where the requested token is beyond the end of
+      // the input stream.
+      if (!t) {
+        // If the lookahead buffer is empty, the expected "(end)" token was
+        // already emitted by the most recent invocation of `advance` and is
+        // available as the next token.
+        if (!lookahead.length) {
+          return state.tokens.next;
+        }
+
+        return lookahead[j - 1];
+      }
+
+      lookahead[j] = t;
+      j += 1;
+    }
+
+    return t;
+  }
+
+  function peekIgnoreEOL() {
+    var i = 0;
+    var t;
+    do {
+      t = peek(i++);
+    } while (t.id === "(endline)");
+    return t;
+  }
+
+  /**
+   * Consume the next token.
+   *
+   * @param {string} [expected] - the expected value of the next token's `id`
+   *                              property (in the case of punctuators) or
+   *                              `value` property (in the case of identifiers
+   *                              and literals); if unspecified, any token will
+   *                              be accepted
+   * @param {object} [relatedToken] - the token that informed the expected
+   *                                  value, if any (for example: the opening
+   *                                  brace when a closing brace is expected);
+   *                                  used to produce more meaningful errors
+   */
+  function advance(expected, relatedToken) {
+    var nextToken = state.tokens.next;
+
+    if (expected && nextToken.id !== expected) {
+      if (relatedToken) {
+        if (nextToken.id === "(end)") {
+          error("E019", relatedToken, relatedToken.id);
+        } else {
+          error("E020", nextToken, expected, relatedToken.id,
+            relatedToken.line, nextToken.value);
+        }
+      } else if (nextToken.type !== "(identifier)" || nextToken.value !== expected) {
+        error("E021", nextToken, expected, nextToken.value);
+      }
+    }
+
+    state.tokens.prev = state.tokens.curr;
+    state.tokens.curr = state.tokens.next;
+    for (;;) {
+      state.tokens.next = lookahead.shift() || lex.token();
+
+      if (!state.tokens.next) { // No more tokens left, give up
+        quit("E041", state.tokens.curr);
+      }
+
+      if (state.tokens.next.id === "(end)" || state.tokens.next.id === "(error)") {
+        return;
+      }
+
+      if (state.tokens.next.check) {
+        state.tokens.next.check();
+      }
+
+      if (state.tokens.next.isSpecial) {
+        lintingDirective(state.tokens.next, state.tokens.curr);
+      } else {
+        if (state.tokens.next.id !== "(endline)") {
+          break;
+        }
+      }
+    }
+  }
+
+  /**
+   * Determine whether a given token is an operator.
+   *
+   * @param {token} token
+   *
+   * @returns {boolean}
+   */
+  function isOperator(token) {
+    return token.first || token.right || token.left || token.id === "yield" || token.id === "await";
+  }
+
+  function isEndOfExpr(context, curr, next) {
+    if (arguments.length <= 1) {
+      curr = state.tokens.curr;
+      next = state.tokens.next;
+    }
+
+    if (next.id === "in" && context & prodParams.noin) {
+      return true;
+    }
+
+    if (next.id === ";" || next.id === "}" || next.id === ":") {
+      return true;
+    }
+
+    if (next.infix === curr.infix ||
+      // Infix operators which follow `yield` should only be consumed as part
+      // of the current expression if allowed by the syntactic grammar. In
+      // effect, this prevents automatic semicolon insertion when `yield` is
+      // followed by a newline and a comma operator (without enabling it when
+      // `yield` is followed by a newline and a `[` token).
+      (curr.id === "yield" && curr.rbp < next.rbp)) {
+      return !sameLine(curr, next);
+    }
+
+    return false;
+  }
+
+  /**
+   * The `expression` function is the heart of JSHint's parsing behaior. It is
+   * based on the Pratt parser, but it extends that model with a `fud` method.
+   * Short for "first null denotation," it it similar to the `nud` ("null
+   * denotation") function, but it is only used on the first token of a
+   * statement. This simplifies usage in statement-oriented languages like
+   * JavaScript.
+   *
+   * .nud  Null denotation
+   * .fud  First null denotation
+   * .led  Left denotation
+   *  lbp  Left binding power
+   *  rbp  Right binding power
+   *
+   * They are elements of the parsing method called Top Down Operator Precedence.
+   *
+   * In addition to parsing, this function applies a number of linting patterns.
+   *
+   * @param {number} context - the parsing context (a bitfield describing
+   *                           conditions of the current parsing operation
+   *                           which can influence how the next tokens are
+   *                           interpreted); see `prod-params.js` for more
+   *                           detail)
+   * @param {number} rbp - the right-binding power of the token to be consumed
+   */
+  function expression(context, rbp) {
+    var left, isArray = false, isObject = false;
+    var initial = context & prodParams.initial;
+    var curr;
+
+    context &= ~prodParams.initial;
+
+    state.nameStack.push();
+
+    if (state.tokens.next.id === "(end)")
+      error("E006", state.tokens.curr);
+
+    advance();
+
+    if (initial) {
+      state.funct["(verb)"] = state.tokens.curr.value;
+      state.tokens.curr.beginsStmt = true;
+    }
+
+    curr = state.tokens.curr;
+
+    if (initial && curr.fud && (!curr.useFud || curr.useFud(context))) {
+      left = state.tokens.curr.fud(context);
+    } else {
+      if (state.tokens.curr.nud) {
+        left = state.tokens.curr.nud(context, rbp);
+      } else {
+        error("E030", state.tokens.curr, state.tokens.curr.id);
+      }
+
+      while (rbp < state.tokens.next.lbp && !isEndOfExpr(context)) {
+        isArray = state.tokens.curr.value === "Array";
+        isObject = state.tokens.curr.value === "Object";
+
+        // #527, new Foo.Array(), Foo.Array(), new Foo.Object(), Foo.Object()
+        // Line breaks in IfStatement heads exist to satisfy the checkJSHint
+        // "Line too long." error.
+        if (left && (left.value || (left.first && left.first.value))) {
+          // If the left.value is not "new", or the left.first.value is a "."
+          // then safely assume that this is not "new Array()" and possibly
+          // not "new Object()"...
+          if (left.value !== "new" ||
+            (left.first && left.first.value && left.first.value === ".")) {
+            isArray = false;
+            // ...In the case of Object, if the left.value and state.tokens.curr.value
+            // are not equal, then safely assume that this not "new Object()"
+            if (left.value !== state.tokens.curr.value) {
+              isObject = false;
+            }
+          }
+        }
+
+        advance();
+
+        if (isArray && state.tokens.curr.id === "(" && state.tokens.next.id === ")") {
+          warning("W009", state.tokens.curr);
+        }
+
+        if (isObject && state.tokens.curr.id === "(" && state.tokens.next.id === ")") {
+          warning("W010", state.tokens.curr);
+        }
+
+        if (left && state.tokens.curr.led) {
+          left = state.tokens.curr.led(context, left);
+        } else {
+          error("E033", state.tokens.curr, state.tokens.curr.id);
+        }
+      }
+    }
+
+    state.nameStack.pop();
+
+    return left;
+  }
+
+
+  // Functions for conformance of style.
+
+  function sameLine(first, second) {
+    return first.line === (second.startLine || second.line);
+  }
+
+  function nobreaknonadjacent(left, right) {
+    if (!state.option.laxbreak && !sameLine(left, right)) {
+      warning("W014", right, right.value);
+    }
+  }
+
+  function nolinebreak(t) {
+    if (!sameLine(t, state.tokens.next)) {
+      warning("E022", t, t.value);
+    }
+  }
+
+  /**
+   * Validate the comma token in the "current" position of the token stream.
+   *
+   * @param {object} [opts]
+   * @param {boolean} [opts.property] - flag indicating whether the current
+   *                                    comma token is situated directly within
+   *                                    an object initializer
+   * @param {boolean} [opts.allowTrailing] - flag indicating whether the
+   *                                         current comma token may appear
+   *                                         directly before a delimiter
+   *
+   * @returns {boolean} flag indicating the validity of the current comma
+   *                    token; `false` if the token directly causes a syntax
+   *                    error, `true` otherwise
+   */
+  function checkComma(opts) {
+    var prev = state.tokens.prev;
+    var curr = state.tokens.curr;
+    opts = opts || {};
+
+    if (!sameLine(prev, curr)) {
+      if (!state.option.laxcomma) {
+        if (checkComma.first) {
+          warning("I001", curr);
+          checkComma.first = false;
+        }
+        warning("W014", prev, curr.value);
+      }
+    }
+
+    if (state.tokens.next.identifier && !(opts.property && state.inES5())) {
+      // Keywords that cannot follow a comma operator.
+      switch (state.tokens.next.value) {
+      case "break":
+      case "case":
+      case "catch":
+      case "continue":
+      case "default":
+      case "do":
+      case "else":
+      case "finally":
+      case "for":
+      case "if":
+      case "in":
+      case "instanceof":
+      case "return":
+      case "switch":
+      case "throw":
+      case "try":
+      case "var":
+      case "let":
+      case "while":
+      case "with":
+        error("E024", state.tokens.next, state.tokens.next.value);
+        return false;
+      }
+    }
+
+    if (state.tokens.next.type === "(punctuator)") {
+      switch (state.tokens.next.value) {
+      case "}":
+      case "]":
+      case ",":
+      case ")":
+        if (opts.allowTrailing) {
+          return true;
+        }
+
+        error("E024", state.tokens.next, state.tokens.next.value);
+        return false;
+      }
+    }
+    return true;
+  }
+
+  /**
+   * Factory function for creating "symbols"--objects that will be inherited by
+   * tokens. The objects created by this function are stored in a symbol table
+   * and set as the prototype of the tokens generated by the lexer.
+   *
+   * Note that this definition of "symbol" describes an implementation detail
+   * of JSHint and is not related to the ECMAScript value type introduced in
+   * ES2015.
+   *
+   * @param {string} s - the name of the token; for keywords (e.g. `void`) and
+   *                     delimiters (e.g.. `[`), this is the token's text
+   *                     representation; for literals (e.g. numbers) and other
+   *                     "special" tokens (e.g. the end-of-file marker) this is
+   *                     a parenthetical value
+   * @param {number} p - the left-binding power of the token as used by the
+   *                     Pratt parsing semantics
+   *
+   * @returns {object} - the object describing the JSHint symbol (provided to
+   *                     support cases where further refinement is necessary)
+   */
+  function symbol(s, p) {
+    var x = state.syntax[s];
+    if (!x || typeof x !== "object") {
+      state.syntax[s] = x = {
+        id: s,
+        lbp: p,
+        // Symbols that accept a right-hand side do so with a binding power
+        // that is commonly identical to their left-binding power. (This value
+        // is relevant when determining if the grouping operator is necessary
+        // to override the precedence of surrounding operators.) Because the
+        // exponentiation operator's left-binding power and right-binding power
+        // are distinct, the values must be encoded separately.
+        rbp: p,
+        value: s
+      };
+    }
+    return x;
+  }
+
+  /**
+   * Convenience function for defining delimiter symbols.
+   *
+   * @param {string} s - the name of the symbol
+   *
+   * @returns {object} - the object describing the JSHint symbol (provided to
+   *                     support cases where further refinement is necessary)
+   */
+  function delim(s) {
+    var x = symbol(s, 0);
+    x.delim = true;
+    return x;
+  }
+
+  /**
+   * Convenience function for defining statement-denoting symbols.
+   *
+   * @param {string} s - the name of the symbol
+   * @param {function} f - the first null denotation function for the symbol;
+   *                       see the `expression` function for more detail
+   *
+   * @returns {object} - the object describing the JSHint symbol (provided to
+   *                     support cases where further refinement is necessary)
+   */
+  function stmt(s, f) {
+    var x = delim(s);
+    x.identifier = x.reserved = true;
+    x.fud = f;
+    return x;
+  }
+
+  /**
+   * Convenience function for defining block-statement-denoting symbols.
+   *
+   * A block-statement-denoting symbol is one like 'if' or 'for', which will be
+   * followed by a block and will not have to end with a semicolon.
+   *
+   * @param {string} s - the name of the symbol
+   * @param {function} - the first null denotation function for the symbol; see
+   *                     the `expression` function for more detail
+   *
+   * @returns {object} - the object describing the JSHint symbol (provided to
+   *                     support cases where further refinement is necessary)
+   */
+  function blockstmt(s, f) {
+    var x = stmt(s, f);
+    x.block = true;
+    return x;
+  }
+  /**
+   * Denote a given JSHint symbol as an identifier and a reserved keyword.
+   *
+   * @param {object} - a JSHint symbol value
+   *
+   * @returns {object} - the provided object
+   */
+  function reserveName(x) {
+    var c = x.id.charAt(0);
+    if ((c >= "a" && c <= "z") || (c >= "A" && c <= "Z")) {
+      x.identifier = x.reserved = true;
+    }
+    return x;
+  }
+
+  /**
+   * Convenience function for defining "prefix" symbols--operators that accept
+   * expressions as a right-hand side.
+   *
+   * @param {string} s - the name of the symbol
+   * @param {function} [f] - the first null denotation function for the symbol;
+   *                         see the `expression` function for more detail
+   *
+   * @returns {object} - the object describing the JSHint symbol (provided to
+   *                     support cases where further refinement is necessary)
+   */
+  function prefix(s, f) {
+    var x = symbol(s, 150);
+    reserveName(x);
+
+    x.nud = (typeof f === "function") ? f : function(context) {
+      this.arity = "unary";
+      this.right = expression(context, 150);
+
+      if (this.id === "++" || this.id === "--") {
+        if (state.option.plusplus) {
+          warning("W016", this, this.id);
+        }
+
+        if (this.right) {
+          checkLeftSideAssign(context, this.right, this);
+        }
+      }
+
+      return this;
+    };
+
+    return x;
+  }
+
+  /**
+   * Convenience function for defining "type" symbols--those that describe
+   * literal values.
+   *
+   * @param {string} s - the name of the symbol
+   * @param {function} f - the first null denotation function for the symbol;
+   *                       see the `expression` function for more detail
+   *
+   * @returns {object} - the object describing the JSHint symbol (provided to
+   *                     support cases where further refinement is necessary)
+   */
+  function type(s, f) {
+    var x = symbol(s, 0);
+    x.type = s;
+    x.nud = f;
+    return x;
+  }
+
+  /**
+   * Convenience function for defining JSHint symbols for reserved
+   * keywords--those that are restricted from use as bindings (and as property
+   * names in ECMAScript 3 environments).
+   *
+   * @param {string} s - the name of the symbol
+   * @param {function} func - the first null denotation function for the
+   *                          symbol; see the `expression` function for more
+   *                          detail
+   *
+   * @returns {object} - the object describing the JSHint symbol (provided to
+   *                     support cases where further refinement is necessary)
+   */
+  function reserve(name, func) {
+    var x = type(name, func);
+    x.identifier = true;
+    x.reserved = true;
+    return x;
+  }
+
+  /**
+   * Convenience function for defining JSHint symbols for keywords that are
+   * only reserved in some circumstances.
+   *
+   * @param {string} name - the name of the symbol
+   * @param {object} [meta] - a collection of optional arguments
+   * @param {function} [meta.nud] -the null denotation function for the symbol;
+   *                   see the `expression` function for more detail
+   * @param {boolean} [meta.es5] - `true` if the identifier is reserved
+   *                               in ECMAScript 5 or later
+   * @param {boolean} [meta.strictOnly] - `true` if the identifier is only
+   *                                      reserved in strict mode code.
+   *
+   * @returns {object} - the object describing the JSHint symbol (provided to
+   *                     support cases where further refinement is necessary)
+   */
+  function FutureReservedWord(name, meta) {
+    var x = type(name, state.syntax["(identifier)"].nud);
+
+    meta = meta || {};
+    meta.isFutureReservedWord = true;
+
+    x.value = name;
+    x.identifier = true;
+    x.reserved = true;
+    x.meta = meta;
+
+    return x;
+  }
+
+  /**
+   * Convenience function for defining "infix" symbols--operators that require
+   * operands as both "land-hand side" and "right-hand side".
+   *
+   * @param {string} s - the name of the symbol
+   * @param {function} [f] - a function to be invoked that consumes the
+   *                         right-hand side of the operator
+   * @param {number} p - the left-binding power of the token as used by the
+   *                     Pratt parsing semantics
+   * @param {boolean} [w] - if `true`
+   *
+   * @returns {object} - the object describing the JSHint symbol (provided to
+   *                     support cases where further refinement is necessary)
+   */
+  function infix(s, f, p, w) {
+    var x = symbol(s, p);
+    reserveName(x);
+    x.infix = true;
+    x.led = function(context, left) {
+      if (!w) {
+        nobreaknonadjacent(state.tokens.prev, state.tokens.curr);
+      }
+      if ((s === "in" || s === "instanceof") && left.id === "!") {
+        warning("W018", left, "!");
+      }
+      if (typeof f === "function") {
+        return f(context, left, this);
+      } else {
+        this.left = left;
+        this.right = expression(context, p);
+        return this;
+      }
+    };
+    return x;
+  }
+
+  /**
+   * Convenience function for defining the `=>` token as used in arrow
+   * functions.
+   *
+   * @param {string} s - the name of the symbol
+   *
+   * @returns {object} - the object describing the JSHint symbol (provided to
+   *                     support cases where further refinement is necessary)
+   */
+  function application(s) {
+    var x = symbol(s, 42);
+
+    x.infix = true;
+    x.led = function(context, left) {
+      nobreaknonadjacent(state.tokens.prev, state.tokens.curr);
+
+      this.left = left;
+      this.right = doFunction(context, { type: "arrow", loneArg: left });
+      return this;
+    };
+    return x;
+  }
+
+  /**
+   * Convenience function for defining JSHint symbols for relation operators.
+   *
+   * @param {string} s - the name of the symbol
+   * @param {function} [f] - a function to be invoked to enforce any additional
+   *                         linting rules.
+   *
+   * @returns {object} - the object describing the JSHint symbol (provided to
+   *                     support cases where further refinement is necessary)
+   */
+  function relation(s, f) {
+    var x = symbol(s, 100);
+
+    x.infix = true;
+    x.led = function(context, left) {
+      nobreaknonadjacent(state.tokens.prev, state.tokens.curr);
+      this.left = left;
+      var right = this.right = expression(context, 100);
+
+      if (isIdentifier(left, "NaN") || isIdentifier(right, "NaN")) {
+        warning("W019", this);
+      } else if (f) {
+        f.apply(this, [context, left, right]);
+      }
+
+      if (!left || !right) {
+        quit("E041", state.tokens.curr);
+      }
+
+      if (left.id === "!") {
+        warning("W018", left, "!");
+      }
+
+      if (right.id === "!") {
+        warning("W018", right, "!");
+      }
+
+      return this;
+    };
+    return x;
+  }
+
+  /**
+   * Determine if a given token marks the beginning of a UnaryExpression.
+   *
+   * @param {object} token
+   *
+   * @returns {boolean}
+   */
+  function beginsUnaryExpression(token) {
+    return token.arity === "unary" && token.id !== "++" && token.id !== "--";
+  }
+
+  var typeofValues = {};
+  typeofValues.legacy = [
+    // E4X extended the `typeof` operator to return "xml" for the XML and
+    // XMLList types it introduced.
+    // Ref: 11.3.2 The typeof Operator
+    // http://www.ecma-international.org/publications/files/ECMA-ST/Ecma-357.pdf
+    "xml",
+    // IE<9 reports "unknown" when the `typeof` operator is applied to an
+    // object existing across a COM+ bridge. In lieu of official documentation
+    // (which does not exist), see:
+    // http://robertnyman.com/2005/12/21/what-is-typeof-unknown/
+    "unknown"
+  ];
+  typeofValues.es3 = [
+    "undefined", "boolean", "number", "string", "function", "object",
+  ];
+  typeofValues.es3 = typeofValues.es3.concat(typeofValues.legacy);
+  typeofValues.es6 = typeofValues.es3.concat("symbol", "bigint");
+
+  /**
+   * Validate comparisons between the result of a `typeof` expression and a
+   * string literal.
+   *
+   * @param {token} [left] - one of the values being compared
+   * @param {token} [right] - the other value being compared
+   * @param {object} state - the global state object (see `state.js`)
+   *
+   * @returns {boolean} - `false` if the second token describes a `typeof`
+   *                       expression and the first token is a string literal
+   *                       whose value is never returned by that operator;
+   *                       `true` otherwise
+   */
+  function isTypoTypeof(left, right, state) {
+    var values;
+
+    if (state.option.notypeof)
+      return false;
+
+    if (!left || !right)
+      return false;
+
+    values = state.inES6() ? typeofValues.es6 : typeofValues.es3;
+
+    if (right.type === "(identifier)" && right.value === "typeof" && left.type === "(string)") {
+      if (left.value === "bigint") {
+        if (!state.option.unstable.bigint) {
+          warning("W144", left, "BigInt", "bigint");
+        }
+
+        return false;
+      }
+
+      return !_.includes(values, left.value);
+    }
+
+    return false;
+  }
+
+  /**
+   * Determine if a given token describes the built-in `eval` function.
+   *
+   * @param {token} left
+   * @param {object} state - the global state object (see `state.js`)
+   *
+   * @returns {boolean}
+   */
+  function isGlobalEval(left, state) {
+    var isGlobal = false;
+
+    // permit methods to refer to an "eval" key in their own context
+    if (left.type === "this" && state.funct["(context)"] === null) {
+      isGlobal = true;
+    }
+    // permit use of "eval" members of objects
+    else if (left.type === "(identifier)") {
+      if (state.option.node && left.value === "global") {
+        isGlobal = true;
+      }
+
+      else if (state.option.browser && (left.value === "window" || left.value === "document")) {
+        isGlobal = true;
+      }
+    }
+
+    return isGlobal;
+  }
+
+  /**
+   * Determine if a given token describes a property of a built-in object.
+   *
+   * @param {token} left
+   *
+   * @returns {boolean}
+   */
+  function findNativePrototype(left) {
+    var natives = [
+      "Array", "ArrayBuffer", "Boolean", "Collator", "DataView", "Date",
+      "DateTimeFormat", "Error", "EvalError", "Float32Array", "Float64Array",
+      "Function", "Infinity", "Intl", "Int16Array", "Int32Array", "Int8Array",
+      "Iterator", "Number", "NumberFormat", "Object", "RangeError",
+      "ReferenceError", "RegExp", "StopIteration", "String", "SyntaxError",
+      "TypeError", "Uint16Array", "Uint32Array", "Uint8Array", "Uint8ClampedArray",
+      "URIError"
+    ];
+
+    function walkPrototype(obj) {
+      if (typeof obj !== "object") return;
+      return obj.right === "prototype" ? obj : walkPrototype(obj.left);
+    }
+
+    function walkNative(obj) {
+      while (!obj.identifier && typeof obj.left === "object")
+        obj = obj.left;
+
+      if (obj.identifier && natives.indexOf(obj.value) >= 0 &&
+          state.funct["(scope)"].isPredefined(obj.value)) {
+        return obj.value;
+      }
+    }
+
+    var prototype = walkPrototype(left);
+    if (prototype) return walkNative(prototype);
+  }
+
+  /**
+   * Determine if the given token is a valid assignment target; emit errors
+   * and/or warnings as appropriate
+   *
+   * @param {number} context - the parsing context; see `prod-params.js` for
+   *                           more information
+   * @param {token} left - the left hand side of the assignment
+   * @param {token=} assignToken - the token for the assignment, used for
+   *                               reporting
+   * @param {object=} options - optional object
+   * @param {boolean} options.allowDestructuring - whether to allow
+   *                                               destructuring binding
+   *
+   * @returns {boolean} Whether the left hand side is OK
+   */
+  function checkLeftSideAssign(context, left, assignToken, options) {
+
+    var allowDestructuring = options && options.allowDestructuring;
+
+    assignToken = assignToken || left;
+
+    if (state.option.freeze) {
+      var nativeObject = findNativePrototype(left);
+      if (nativeObject)
+        warning("W121", left, nativeObject);
+    }
+
+    if (left.identifier && !left.isMetaProperty) {
+      // The `reassign` method also calls `modify`, but we are specific in
+      // order to catch function re-assignment and globals re-assignment
+      state.funct["(scope)"].block.reassign(left.value, left);
+    }
+
+    if (left.id === ".") {
+      if (!left.left || left.left.value === "arguments" && !state.isStrict()) {
+        warning("W143", assignToken);
+      }
+
+      state.nameStack.set(state.tokens.prev);
+      return true;
+    } else if (left.id === "{" || left.id === "[") {
+      if (!allowDestructuring || !left.destructAssign) {
+        if (left.id === "{" || !left.left) {
+          warning("E031", assignToken);
+        } else if (left.left.value === "arguments" && !state.isStrict()) {
+          warning("W143", assignToken);
+        }
+      }
+
+      if (left.id === "[") {
+        state.nameStack.set(left.right);
+      }
+
+      return true;
+    } else if (left.identifier && !isReserved(context, left) && !left.isMetaProperty) {
+      if (state.funct["(scope)"].bindingtype(left.value) === "exception") {
+        warning("W022", left);
+      }
+
+      if (left.value === "eval" && state.isStrict()) {
+        error("E031", assignToken);
+        return false;
+      } else if (left.value === "arguments") {
+        if (!state.isStrict()) {
+          warning("W143", assignToken);
+        } else {
+          error("E031", assignToken);
+          return false;
+        }
+      }
+      state.nameStack.set(left);
+      return true;
+    }
+
+    error("E031", assignToken);
+
+    return false;
+  }
+
+  /**
+   * Convenience function for defining JSHint symbols for assignment operators.
+   *
+   * @param {string} s - the name of the symbol
+   * @param {function} [f] - a function to be invoked that consumes the
+   *                         right-hand side of the operator (see the `infix`
+   *                         function)
+   *
+   * @returns {object} - the object describing the JSHint symbol (provided to
+   *                     support cases where further refinement is necessary)
+   */
+  function assignop(s, f) {
+    var x = infix(s, typeof f === "function" ? f : function(context, left, that) {
+      that.left = left;
+
+      checkLeftSideAssign(context, left, that, { allowDestructuring: true });
+
+      that.right = expression(context, 10);
+
+      return that;
+    }, 20);
+
+    x.exps = true;
+    x.assign = true;
+
+    return x;
+  }
+
+  /**
+   * Convenience function for defining JSHint symbols for bitwise operators.
+   *
+   * @param {string} s - the name of the symbol
+   * @param {function} [f] - the left denotation function for the symbol; see
+   *                         the `expression` function for more detail
+   * @param {number} p - the left-binding power of the token as used by the
+   *                     Pratt parsing semantics
+   *
+   * @returns {object} - the object describing the JSHint symbol (provided to
+   *                     support cases where further refinement is necessary)
+   */
+  function bitwise(s, f, p) {
+    var x = symbol(s, p);
+    reserveName(x);
+    x.infix = true;
+    x.led = (typeof f === "function") ? f : function(context, left) {
+      if (state.option.bitwise) {
+        warning("W016", this, this.id);
+      }
+      this.left = left;
+      this.right = expression(context, p);
+      return this;
+    };
+    return x;
+  }
+
+  /**
+   * Convenience function for defining JSHint symbols for bitwise assignment
+   * operators. See the `assignop` function for more detail.
+   *
+   * @param {string} s - the name of the symbol
+   *
+   * @returns {object} - the object describing the JSHint symbol (provided to
+   *                     support cases where further refinement is necessary)
+   */
+  function bitwiseassignop(s) {
+    symbol(s, 20).exps = true;
+    return infix(s, function(context, left, that) {
+      if (state.option.bitwise) {
+        warning("W016", that, that.id);
+      }
+
+      checkLeftSideAssign(context, left, that);
+
+      that.right = expression(context, 10);
+
+      return that;
+    }, 20);
+  }
+
+  /**
+   * Convenience function for defining JSHint symbols for those operators which
+   * have a single operand that appears before them in the source code.
+   *
+   * @param {string} s - the name of the symbol
+   *
+   * @returns {object} - the object describing the JSHint symbol (provided to
+   *                     support cases where further refinement is necessary)
+   */
+  function suffix(s) {
+    var x = symbol(s, 150);
+
+    x.led = function(context, left) {
+      // this = suffix e.g. "++" punctuator
+      // left = symbol operated e.g. "a" identifier or "a.b" punctuator
+      if (state.option.plusplus) {
+        warning("W016", this, this.id);
+      }
+
+      checkLeftSideAssign(context, left, this);
+
+      this.left = left;
+      return this;
+    };
+    return x;
+  }
+
+  /**
+   * Retrieve the value of the current token if it is an identifier and
+   * optionally advance the parser.
+   *
+   * @param {number} context - the parsing context; see `prod-params.js` for
+   *                           more information
+   * @param {boolean} [prop] -`true` if this identifier is that of an object
+   *                           property
+   * @param {boolean} [preserve] - `true` if the token should not be consumed
+   *
+   * @returns {string|undefined} - the value of the identifier, if present
+   */
+  function optionalidentifier(context, prop, preserve) {
+    if (!state.tokens.next.identifier) {
+      return;
+    }
+
+    if (!preserve) {
+      advance();
+    }
+
+    var curr = state.tokens.curr;
+    var val  = state.tokens.curr.value;
+
+    if (!isReserved(context, curr)) {
+      return val;
+    }
+
+    if (prop) {
+      if (state.inES5()) {
+        return val;
+      }
+    }
+
+    warning("W024", state.tokens.curr, state.tokens.curr.id);
+    return val;
+  }
+
+  /**
+   * Consume the "..." token which designates "spread" and "rest" operations if
+   * it is present. If the operator is repeated, consume every repetition, and
+   * issue a single error describing the syntax error.
+   *
+   * @param {string} operation - either "spread" or "rest"
+   *
+   * @returns {boolean} a value describing whether or not any tokens were
+   *                    consumed in this way
+   */
+  function spreadrest(operation) {
+    if (!checkPunctuator(state.tokens.next, "...")) {
+      return false;
+    }
+
+    if (!state.inES6(true)) {
+      warning("W119", state.tokens.next, operation + " operator", "6");
+    }
+    advance();
+
+    if (checkPunctuator(state.tokens.next, "...")) {
+      warning("E024", state.tokens.next, "...");
+      while (checkPunctuator(state.tokens.next, "...")) {
+        advance();
+      }
+    }
+
+    return true;
+  }
+
+  /**
+   * Ensure that the current token is an identifier and retrieve its value.
+   *
+   * @param {number} context - the parsing context; see `prod-params.js` for
+   *                           more information
+   * @param {boolean} [prop] -`true` if this identifier is that of an object
+   *                           property
+   *
+   * @returns {string|undefined} - the value of the identifier, if present
+   */
+  function identifier(context, prop) {
+    var i = optionalidentifier(context, prop, false);
+    if (i) {
+      return i;
+    }
+
+    error("E030", state.tokens.next, state.tokens.next.value);
+
+    // The token should be consumed after a warning is issued so the parser
+    // can continue as though an identifier were found. The semicolon token
+    // should not be consumed in this way so that the parser interprets it as
+    // a statement delimiter;
+    if (state.tokens.next.id !== ";") {
+      advance();
+    }
+  }
+
+
+  /**
+   * Determine if the provided token may be evaluated and emit a linting
+   * warning if this is note the case.
+   *
+   * @param {token} controlToken
+   */
+  function reachable(controlToken) {
+    var i = 0, t;
+    if (state.tokens.next.id !== ";" || controlToken.inBracelessBlock) {
+      return;
+    }
+    for (;;) {
+      do {
+        t = peek(i);
+        i += 1;
+      } while (t.id !== "(end)" && t.id === "(comment)");
+
+      if (t.reach) {
+        return;
+      }
+      if (t.id !== "(endline)") {
+        if (t.id === "function") {
+          if (state.option.latedef === true) {
+            warning("W026", t);
+          }
+          break;
+        }
+
+        warning("W027", t, t.value, controlToken.value);
+        break;
+      }
+    }
+  }
+
+  /**
+   * Consume the semicolon that delimits the statement currently being parsed,
+   * emitting relevant warnings/errors as appropriate.
+   *
+   * @param {token} stmt - token describing the statement under consideration
+   */
+  function parseFinalSemicolon(stmt) {
+    if (state.tokens.next.id !== ";") {
+      // don't complain about unclosed templates / strings
+      if (state.tokens.next.isUnclosed) return advance();
+
+      var isSameLine = sameLine(state.tokens.curr, state.tokens.next) &&
+                       state.tokens.next.id !== "(end)";
+      var blockEnd = checkPunctuator(state.tokens.next, "}");
+
+      if (isSameLine && !blockEnd && !(stmt.id === "do" && state.inES6(true))) {
+        errorAt("E058", state.tokens.curr.line, state.tokens.curr.character);
+      } else if (!state.option.asi) {
+
+        // If this is the last statement in a block that ends on the same line
+        // *and* option lastsemic is on, ignore the warning.  Otherwise, issue
+        // a warning about missing semicolon.
+        if (!(blockEnd && isSameLine && state.option.lastsemic)) {
+          warningAt("W033", state.tokens.curr.line, state.tokens.curr.character);
+        }
+      }
+    } else {
+      advance(";");
+    }
+  }
+
+  /**
+   * Consume a statement.
+   *
+   * @param {number} context - the parsing context; see `prod-params.js` for
+   *                           more information
+   *
+   * @returns {token} - the token describing the statement
+   */
+  function statement(context) {
+    var i = indent, r, t = state.tokens.next, hasOwnScope = false;
+
+    context |= prodParams.initial;
+
+    if (t.id === ";") {
+      advance(";");
+      return;
+    }
+
+    // Is this a labelled statement?
+    var res = isReserved(context, t);
+
+    // We're being more tolerant here: if someone uses
+    // a FutureReservedWord (that is not meant to start a statement)
+    // as a label, we warn but proceed anyway.
+
+    if (res && t.meta && t.meta.isFutureReservedWord && !t.fud) {
+      warning("W024", t, t.id);
+      res = false;
+    }
+
+    if (t.identifier && !res && peek().id === ":") {
+      advance();
+      advance(":");
+
+      hasOwnScope = true;
+      state.funct["(scope)"].stack();
+      state.funct["(scope)"].block.addLabel(t.value, { token: state.tokens.curr });
+
+      if (!state.tokens.next.labelled && state.tokens.next.value !== "{") {
+        warning("W028", state.tokens.next, t.value, state.tokens.next.value);
+      }
+
+      t = state.tokens.next;
+    }
+
+    // Is it a lonely block?
+
+    if (t.id === "{") {
+      // Is it a switch case block?
+      //
+      //  switch (foo) {
+      //    case bar: { <= here.
+      //      ...
+      //    }
+      //  }
+      var iscase = (state.funct["(verb)"] === "case" && state.tokens.curr.value === ":");
+      block(context, true, true, false, false, iscase);
+
+      if (hasOwnScope) {
+        state.funct["(scope)"].unstack();
+      }
+
+      return;
+    }
+
+    // Parse the statement.
+
+    r = expression(context, 0);
+
+    if (r && !(r.identifier && r.value === "function") &&
+        !(r.type === "(punctuator)" && r.left &&
+          r.left.identifier && r.left.value === "function")) {
+      if (!state.isStrict() && state.stmtMissingStrict()) {
+        warning("E007");
+      }
+    }
+
+    // Look for the final semicolon.
+
+    if (!t.block) {
+      if (!state.option.expr && (!r || !r.exps)) {
+        warning("W030", state.tokens.curr);
+      } else if (state.option.nonew && r && r.left && r.id === "(" && r.left.id === "new") {
+        warning("W031", t);
+      }
+
+      parseFinalSemicolon(t);
+    }
+
+
+    // Restore the indentation.
+
+    indent = i;
+    if (hasOwnScope) {
+      state.funct["(scope)"].unstack();
+    }
+    return r;
+  }
+
+  /**
+   * Consume a series of statements until encountering either the end of the
+   * program or a token that interrupts control flow.
+   *
+   * @param {number} context - the parsing context; see `prod-params.js` for
+   *                           more information
+   *
+   * @returns {Array<token>} - the tokens consumed
+   */
+  function statements(context) {
+    var a = [], p;
+
+    while (!state.tokens.next.reach && state.tokens.next.id !== "(end)") {
+      if (state.tokens.next.id === ";") {
+        p = peek();
+
+        if (!p || (p.id !== "(" && p.id !== "[")) {
+          warning("W032");
+        }
+
+        advance(";");
+      } else {
+        a.push(statement(context));
+      }
+    }
+    return a;
+  }
+
+
+  /**
+   * Parse any directives in a directive prologue.
+   */
+  function directives() {
+    var current = state.tokens.next;
+    while (state.tokens.next.id === "(string)") {
+      var next = peekIgnoreEOL();
+      if (!isEndOfExpr(0, current, next)) {
+        break;
+      }
+      current = next;
+
+      advance();
+      var directive = state.tokens.curr.value;
+      if (state.directive[directive] ||
+          (directive === "use strict" && state.option.strict === "implied")) {
+        warning("W034", state.tokens.curr, directive);
+      }
+
+      // From ECMAScript 2016:
+      //
+      // > 14.1.2 Static Semantics: Early Errors
+      // >
+      // > [...]
+      // > - It is a Syntax Error if ContainsUseStrict of FunctionBody is true
+      // >   and IsSimpleParameterList of FormalParameters is false.
+      if (directive === "use strict" && state.inES7() &&
+        !state.funct["(global)"] && state.funct["(hasSimpleParams)"] === false) {
+        error("E065", state.tokens.curr);
+      }
+
+      // there's no directive negation, so always set to true
+      state.directive[directive] = true;
+
+      parseFinalSemicolon(current);
+    }
+
+    if (state.isStrict()) {
+      state.option.undef = true;
+    }
+  }
+
+  /**
+   * Parses a single block. A block is a sequence of statements wrapped in
+   * braces.
+   *
+   * @param {number} context - parsing context
+   * @param {boolean} ordinary - `true` for everything but function bodies and
+   *                             try blocks
+   * @param {boolean} [stmt] - `true` if block can be a single statement (e.g.
+   *                           in if/for/while)
+   * @param {boolean} [isfunc] - `true` if block is a function body
+   * @param {boolean} [isfatarrow] - `true` if its a body of a fat arrow
+   *                                 function
+   * @param {boolean} [iscase] - `true` if block is a switch case block
+   *
+   * @returns {token} - the token describing the block
+   */
+  function block(context, ordinary, stmt, isfunc, isfatarrow, iscase) {
+    var a,
+      b = inblock,
+      old_indent = indent,
+      m,
+      t,
+      d;
+
+    inblock = ordinary;
+
+    t = state.tokens.next;
+
+    var metrics = state.funct["(metrics)"];
+    metrics.nestedBlockDepth += 1;
+    metrics.verifyMaxNestedBlockDepthPerFunction();
+
+    if (state.tokens.next.id === "{") {
+      advance("{");
+
+      // create a new block scope
+      state.funct["(scope)"].stack();
+
+      if (state.tokens.next.id !== "}") {
+        indent += state.option.indent;
+        while (!ordinary && state.tokens.next.from > indent) {
+          indent += state.option.indent;
+        }
+
+        if (isfunc) {
+          m = {};
+          for (d in state.directive) {
+            m[d] = state.directive[d];
+          }
+          directives();
+
+          state.funct["(isStrict)"] = state.isStrict();
+
+          if (state.option.strict && state.funct["(context)"]["(global)"]) {
+            if (!m["use strict"] && !state.isStrict()) {
+              warning("E007");
+            }
+          }
+        }
+
+        a = statements(context);
+
+        metrics.statementCount += a.length;
+
+        indent -= state.option.indent;
+      } else if (isfunc) {
+        // Ensure property is set for functions with empty bodies.
+        state.funct["(isStrict)"] = state.isStrict();
+      }
+
+      advance("}", t);
+
+      if (isfunc) {
+        state.funct["(scope)"].validateParams(isfatarrow);
+        if (m) {
+          state.directive = m;
+        }
+      }
+
+      state.funct["(scope)"].unstack();
+
+      indent = old_indent;
+    } else if (!ordinary) {
+      if (isfunc) {
+        state.funct["(scope)"].stack();
+
+        if (stmt && !isfatarrow && !state.inMoz()) {
+          error("W118", state.tokens.curr, "function closure expressions");
+        }
+
+        if (isfatarrow) {
+          state.funct["(scope)"].validateParams(true);
+        }
+
+        var expr = expression(context, 10);
+
+        if (state.option.noreturnawait && context & prodParams.async &&
+            expr.identifier && expr.value === "await") {
+          warning("W146", expr);
+        }
+
+        if (state.option.strict && state.funct["(context)"]["(global)"]) {
+          if (!state.isStrict()) {
+            warning("E007");
+          }
+        }
+
+        state.funct["(scope)"].unstack();
+      } else {
+        error("E021", state.tokens.next, "{", state.tokens.next.value);
+      }
+    } else {
+
+      state.funct["(scope)"].stack();
+
+      if (!stmt || state.option.curly) {
+        warning("W116", state.tokens.next, "{", state.tokens.next.value);
+      }
+
+      // JSHint observes Annex B of the ECMAScript specification by default,
+      // where function declarations are permitted in the statement positions
+      // of IfStatements.
+      var supportsFnDecl = state.funct["(verb)"] === "if" ||
+        state.tokens.curr.id === "else";
+
+      state.tokens.next.inBracelessBlock = true;
+      indent += state.option.indent;
+      // test indentation only if statement is in new line
+      a = [statement(context)];
+      indent -= state.option.indent;
+
+      if (a[0] && a[0].declaration &&
+        !(supportsFnDecl && a[0].id === "function")) {
+        error("E048", a[0], a[0].id[0].toUpperCase() + a[0].id.slice(1));
+      }
+
+      state.funct["(scope)"].unstack();
+    }
+
+    // Don't clear and let it propagate out if it is "break", "return" or
+    // similar in switch case
+    switch (state.funct["(verb)"]) {
+    case "break":
+    case "continue":
+    case "return":
+    case "throw":
+      if (iscase) {
+        break;
+      }
+
+      /* falls through */
+    default:
+      state.funct["(verb)"] = null;
+    }
+
+    inblock = b;
+    if (ordinary && state.option.noempty && (!a || a.length === 0)) {
+      warning("W035", state.tokens.prev);
+    }
+    metrics.nestedBlockDepth -= 1;
+    return a;
+  }
+
+
+  /**
+   * Update the global state which tracks all statically-identifiable property
+   * names, and emit a warning if the `members` linting directive is in use and
+   * does not include the given name.
+   *
+   * @param {string} m - the property name
+   */
+  function countMember(m) {
+    if (membersOnly && typeof membersOnly[m] !== "boolean") {
+      warning("W036", state.tokens.curr, m);
+    }
+    if (typeof member[m] === "number") {
+      member[m] += 1;
+    } else {
+      member[m] = 1;
+    }
+  }
+
+  // Build the syntax table by declaring the syntactic elements of the language.
+
+  type("(number)", function() {
+    if (state.tokens.next.id === ".") {
+      warning("W005", this);
+    }
+
+    return this;
+  });
+
+  type("(string)", function() {
+    return this;
+  });
+
+  state.syntax["(identifier)"] = {
+    type: "(identifier)",
+    lbp: 0,
+    identifier: true,
+
+    nud: function(context) {
+      var v = this.value;
+      // If this identifier is the lone parameter to a shorthand "fat arrow"
+      // function definition, i.e.
+      //
+      //     x => x;
+      //
+      // ...it should not be considered as a variable in the current scope. It
+      // will be added to the scope of the new function when the next token is
+      // parsed, so it can be safely ignored for now.
+      var isLoneArrowParam = state.tokens.next.id === "=>";
+
+      if (isReserved(context, this)) {
+        warning("W024", this, v);
+      } else if (!isLoneArrowParam && !state.funct["(comparray)"].check(v)) {
+        state.funct["(scope)"].block.use(v, state.tokens.curr);
+      }
+
+      return this;
+    },
+
+    led: function() {
+      /* istanbul ignore next */
+      error("E033", state.tokens.next, state.tokens.next.value);
+    }
+  };
+
+  var baseTemplateSyntax = {
+    identifier: false,
+    template: true,
+  };
+  state.syntax["(template)"] = _.extend({
+    lbp: 155,
+    type: "(template)",
+    nud: doTemplateLiteral,
+    led: doTemplateLiteral,
+    noSubst: false
+  }, baseTemplateSyntax);
+
+  state.syntax["(template middle)"] = _.extend({
+    lbp: 0,
+    type: "(template middle)",
+    noSubst: false
+  }, baseTemplateSyntax);
+
+  state.syntax["(template tail)"] = _.extend({
+    lbp: 0,
+    type: "(template tail)",
+    tail: true,
+    noSubst: false
+  }, baseTemplateSyntax);
+
+  state.syntax["(no subst template)"] = _.extend({
+    lbp: 155,
+    type: "(template)",
+    nud: doTemplateLiteral,
+    led: doTemplateLiteral,
+    noSubst: true,
+    tail: true // mark as tail, since it's always the last component
+  }, baseTemplateSyntax);
+
+  type("(regexp)", function() {
+    return this;
+  });
+
+  // ECMAScript parser
+
+  delim("(endline)");
+  (function(x) {
+    x.line = x.from = 0;
+  })(delim("(begin)"));
+  delim("(end)").reach = true;
+  delim("(error)").reach = true;
+  delim("}").reach = true;
+  delim(")");
+  delim("]");
+  delim("\"").reach = true;
+  delim("'").reach = true;
+  delim(";");
+  delim(":").reach = true;
+  delim("#");
+
+  reserve("else");
+  reserve("case").reach = true;
+  reserve("catch");
+  reserve("default").reach = true;
+  reserve("finally");
+  reserve("true", function() { return this; });
+  reserve("false", function() { return this; });
+  reserve("null", function() { return this; });
+  reserve("this", function() {
+    if (state.isStrict() && !isMethod() &&
+        !state.option.validthis && ((state.funct["(statement)"] &&
+        state.funct["(name)"].charAt(0) > "Z") || state.funct["(global)"])) {
+      warning("W040", this);
+    }
+
+    return this;
+  });
+  reserve("super", function() {
+    superNud.call(state.tokens.curr, this);
+
+    return this;
+  });
+
+  assignop("=", "assign");
+  assignop("+=", "assignadd");
+  assignop("-=", "assignsub");
+  assignop("*=", "assignmult");
+  assignop("/=", "assigndiv").nud = function() {
+    /* istanbul ignore next */
+    error("E014");
+  };
+  assignop("%=", "assignmod");
+  assignop("**=", function(context, left, that) {
+    if (!state.inES7()) {
+      warning("W119", that, "Exponentiation operator", "7");
+    }
+
+    that.left = left;
+
+    checkLeftSideAssign(context, left, that);
+
+    that.right = expression(context, 10);
+
+    return that;
+  });
+
+  bitwiseassignop("&=");
+  bitwiseassignop("|=");
+  bitwiseassignop("^=");
+  bitwiseassignop("<<=");
+  bitwiseassignop(">>=");
+  bitwiseassignop(">>>=");
+  infix(",", function(context, left, that) {
+    if (state.option.nocomma) {
+      warning("W127", that);
+    }
+
+    that.left = left;
+
+    if (checkComma()) {
+      that.right = expression(context, 10);
+    } else {
+      that.right = null;
+    }
+
+    return that;
+  }, 10, true);
+
+  infix("?", function(context, left, that) {
+    increaseComplexityCount();
+    that.left = left;
+    that.right = expression(context & ~prodParams.noin, 10);
+    advance(":");
+    expression(context, 10);
+    return that;
+  }, 30);
+
+  infix("||", function(context, left, that) {
+    increaseComplexityCount();
+    that.left = left;
+    that.right = expression(context, 40);
+    return that;
+  }, 40);
+
+  var andPrecedence = 50;
+  infix("&&", function(context, left, that) {
+    increaseComplexityCount();
+    that.left = left;
+    that.right = expression(context, andPrecedence);
+    return that;
+  }, andPrecedence);
+
+  // The Exponentiation operator, introduced in ECMAScript 2016
+  //
+  // ExponentiationExpression[Yield] :
+  //   UnaryExpression[?Yield]
+  //   UpdateExpression[?Yield] ** ExponentiationExpression[?Yield]
+  infix("**", function(context, left, that) {
+    if (!state.inES7()) {
+      warning("W119", that, "Exponentiation operator", "7");
+    }
+
+    // Disallow UnaryExpressions which are not wrapped in parenthesis
+    if (!left.paren && beginsUnaryExpression(left)) {
+      error("E024", that, "**");
+    }
+
+    that.left = left;
+    that.right = expression(context, that.rbp);
+    return that;
+  }, 150);
+  state.syntax["**"].rbp = 140;
+  bitwise("|", "bitor", 70);
+  bitwise("^", "bitxor", 80);
+  bitwise("&", "bitand", 90);
+  relation("==", function(context, left, right) {
+    var eqnull = state.option.eqnull &&
+      ((left && left.value) === "null" || (right && right.value) === "null");
+
+    switch (true) {
+      case !eqnull && state.option.eqeqeq:
+        this.from = this.character;
+        warning("W116", this, "===", "==");
+        break;
+      /* istanbul ignore next */
+      case isTypoTypeof(right, left, state):
+        warning("W122", this, right.value);
+        break;
+      case isTypoTypeof(left, right, state):
+        warning("W122", this, left.value);
+        break;
+    }
+
+    return this;
+  });
+  relation("===", function(context, left, right) {
+    if (isTypoTypeof(right, left, state)) {
+      warning("W122", this, right.value);
+    } else if (isTypoTypeof(left, right, state)) {
+      /* istanbul ignore next */
+      warning("W122", this, left.value);
+    }
+    return this;
+  });
+  relation("!=", function(context, left, right) {
+    var eqnull = state.option.eqnull &&
+        ((left && left.value) === "null" || (right && right.value) === "null");
+
+    if (!eqnull && state.option.eqeqeq) {
+      this.from = this.character;
+      warning("W116", this, "!==", "!=");
+    } else if (isTypoTypeof(right, left, state)) {
+      /* istanbul ignore next */
+      warning("W122", this, right.value);
+    } else if (isTypoTypeof(left, right, state)) {
+      warning("W122", this, left.value);
+    }
+    return this;
+  });
+  relation("!==", function(context, left, right) {
+    if (isTypoTypeof(right, left, state)) {
+      warning("W122", this, right.value);
+    } else if (isTypoTypeof(left, right, state)) {
+      /* istanbul ignore next */
+      warning("W122", this, left.value);
+    }
+    return this;
+  });
+  relation("<");
+  relation(">");
+  relation("<=");
+  relation(">=");
+  bitwise("<<", "shiftleft", 120);
+  bitwise(">>", "shiftright", 120);
+  bitwise(">>>", "shiftrightunsigned", 120);
+  infix("in", "in", 120);
+  infix("instanceof", function(context, left, token) {
+    var right;
+    var scope = state.funct["(scope)"];
+    token.left = left;
+    token.right = right = expression(context, 120);
+
+    // This condition reflects a syntax error which will be reported by the
+    // `expression` function.
+    if (!right) {
+      return token;
+    }
+
+    if (right.id === "(number)" ||
+        right.id === "(string)" ||
+        right.value === "null" ||
+        (right.value === "undefined" && !scope.has("undefined")) ||
+        right.arity === "unary" ||
+        right.id === "{" ||
+        (right.id === "[" && !right.right) ||
+        right.id === "(regexp)" ||
+        (right.id === "(template)" && !right.tag)) {
+      error("E060");
+    }
+
+    if (right.id === "function") {
+      warning("W139");
+    }
+
+    return token;
+  }, 120);
+  infix("+", function(context, left, that) {
+    var next = state.tokens.next;
+    var right;
+    that.left = left;
+    that.right = right = expression(context, 130);
+
+    if (left && right && left.id === "(string)" && right.id === "(string)") {
+      left.value += right.value;
+      left.character = right.character;
+      if (!state.option.scripturl && reg.javascriptURL.test(left.value)) {
+        warning("W050", left);
+      }
+      return left;
+    }
+
+    if (next.id === "+" || next.id === "++") {
+      warning("W007", that.right);
+    }
+
+    return that;
+  }, 130);
+  prefix("+", function(context) {
+    var next = state.tokens.next;
+    this.arity = "unary";
+    this.right = expression(context, 150);
+
+    if (next.id === "+" || next.id === "++") {
+      warning("W007", this.right);
+    }
+
+    return this;
+  });
+  infix("-", function(context, left, that) {
+    var next = state.tokens.next;
+    that.left = left;
+    that.right = expression(context, 130);
+
+    if (next.id === "-" || next.id === "--") {
+      warning("W006", that.right);
+    }
+
+    return that;
+  }, 130);
+  prefix("-", function(context) {
+    var next = state.tokens.next;
+    this.arity = "unary";
+    this.right = expression(context, 150);
+
+    if (next.id === "-" || next.id === "--") {
+      warning("W006", this.right);
+    }
+
+    return this;
+  });
+  infix("*", "mult", 140);
+  infix("/", "div", 140);
+  infix("%", "mod", 140);
+
+  suffix("++");
+  prefix("++", "preinc");
+  state.syntax["++"].exps = true;
+
+  suffix("--");
+  prefix("--", "predec");
+  state.syntax["--"].exps = true;
+
+  prefix("delete", function(context) {
+    this.arity = "unary";
+    var p = expression(context, 150);
+    if (!p) {
+      return this;
+    }
+
+    if (p.id !== "." && p.id !== "[") {
+      warning("W051");
+    }
+    this.first = p;
+
+    // The `delete` operator accepts unresolvable references when not in strict
+    // mode, so the operand may be undefined.
+    if (p.identifier && !state.isStrict()) {
+      p.forgiveUndef = true;
+    }
+    return this;
+  }).exps = true;
+
+  prefix("~", function(context) {
+    if (state.option.bitwise) {
+      warning("W016", this, "~");
+    }
+    this.arity = "unary";
+    this.right = expression(context, 150);
+    return this;
+  });
+
+  infix("...");
+
+  prefix("!", function(context) {
+    this.arity = "unary";
+    this.right = expression(context, 150);
+
+    if (!this.right) { // '!' followed by nothing? Give up.
+      quit("E041", this);
+    }
+
+    if (bang[this.right.id] === true) {
+      warning("W018", this, "!");
+    }
+    return this;
+  });
+
+  prefix("typeof", function(context) {
+    this.arity = "unary";
+    var p = expression(context, 150);
+    this.first = this.right = p;
+
+    if (!p) { // 'typeof' followed by nothing? Give up.
+      quit("E041", this);
+    }
+
+    // The `typeof` operator accepts unresolvable references, so the operand
+    // may be undefined.
+    if (p.identifier) {
+      p.forgiveUndef = true;
+    }
+    return this;
+  });
+  prefix("new", function(context) {
+    var mp = metaProperty(context, "target", function() {
+      if (!state.inES6(true)) {
+        warning("W119", state.tokens.prev, "new.target", "6");
+      }
+      var inFunction, c = state.funct;
+      while (c) {
+        inFunction = !c["(global)"];
+        if (!c["(arrow)"]) { break; }
+        c = c["(context)"];
+      }
+      if (!inFunction) {
+        warning("W136", state.tokens.prev, "new.target");
+      }
+    });
+    if (mp) { return mp; }
+
+    var c = expression(context, 155), i;
+    if (c && c.id !== "function") {
+      if (c.identifier) {
+        switch (c.value) {
+        case "Number":
+        case "String":
+        case "Boolean":
+        case "Math":
+        case "JSON":
+          warning("W053", state.tokens.prev, c.value);
+          break;
+        case "Symbol":
+          if (state.inES6()) {
+            warning("W053", state.tokens.prev, c.value);
+          }
+          break;
+        case "Function":
+          if (!state.option.evil) {
+            warning("W054");
+          }
+          break;
+        case "Date":
+        case "RegExp":
+        case "this":
+          break;
+        default:
+          i = c.value.substr(0, 1);
+          if (state.option.newcap && (i < "A" || i > "Z") &&
+            !state.funct["(scope)"].isPredefined(c.value)) {
+            warning("W055", state.tokens.curr);
+          }
+        }
+      } else {
+        if (c.id !== "." && c.id !== "[" && c.id !== "(") {
+          /* istanbul ignore next */
+          warning("W056", state.tokens.curr);
+        }
+      }
+    } else {
+      if (!state.option.supernew)
+        warning("W057", this);
+    }
+    if (state.tokens.next.id !== "(" && !state.option.supernew) {
+      warning("W058", state.tokens.curr, state.tokens.curr.value);
+    }
+    this.first = this.right = c;
+    return this;
+  });
+  state.syntax["new"].exps = true;
+
+
+  var classDeclaration = blockstmt("class", function(context) {
+    var className, classNameToken;
+    var inexport = context & prodParams.export;
+
+    if (!state.inES6()) {
+      warning("W104", state.tokens.curr, "class", "6");
+    }
+    state.inClassBody = true;
+
+    // Class Declaration: 'class <Classname>'
+    if (state.tokens.next.identifier && state.tokens.next.value !== "extends") {
+      classNameToken = state.tokens.next;
+      className = classNameToken.value;
+      identifier(context);
+      // unintialized, so that the 'extends' clause is parsed while the class is in TDZ
+      state.funct["(scope)"].addbinding(className, {
+        type: "class",
+        initialized: false,
+        token: classNameToken
+      });
+    }
+
+    // Class Declaration: 'class <Classname> extends <Superclass>'
+    if (state.tokens.next.value === "extends") {
+      advance("extends");
+      expression(context, 0);
+    }
+
+    if (classNameToken) {
+      this.name = className;
+      state.funct["(scope)"].initialize(className);
+      if (inexport) {
+        state.funct["(scope)"].setExported(className, classNameToken);
+      }
+    }
+    state.funct["(scope)"].stack();
+    classBody(this, context);
+    return this;
+  });
+  classDeclaration.exps = true;
+  classDeclaration.declaration = true;
+
+  /*
+    Class expression
+
+    The Block- and Expression- handling for "class" are almost identical, except for the ordering of steps.
+    In an expression:, the name should not be saved into the calling scope, but is still accessible inside the definition, so we open a new scope first, then save the name. We also mark it as used.
+  */
+  prefix("class", function(context) {
+    var className, classNameToken;
+
+    if (!state.inES6()) {
+      warning("W104", state.tokens.curr, "class", "6");
+    }
+    state.inClassBody = true;
+
+    // Class Declaration: 'class <Classname>'
+    if (state.tokens.next.identifier && state.tokens.next.value !== "extends") {
+      classNameToken = state.tokens.next;
+      className = classNameToken.value;
+      identifier(context);
+    }
+
+    // Class Declaration: 'class <Classname> extends <Superclass>'
+    if (state.tokens.next.value === "extends") {
+      advance("extends");
+      expression(context, 0);
+    }
+
+    state.funct["(scope)"].stack();
+    if (classNameToken) {
+      this.name = className;
+      state.funct["(scope)"].addbinding(className, {
+        type: "class",
+        initialized: true,
+        token: classNameToken
+      });
+      state.funct["(scope)"].block.use(className, classNameToken);
+    }
+
+    classBody(this, context);
+    return this;
+  });
+
+  function classBody(classToken, context) {
+    var props = Object.create(null);
+    var name, accessorType, token, isStatic, inGenerator, hasConstructor;
+
+    /* istanbul ignore else */
+    if (state.tokens.next.value === "{") {
+      advance("{");
+    } else {
+      warning("W116", state.tokens.curr, "identifier", state.tokens.next.type); //?
+      advance();
+    }
+
+    while (state.tokens.next.value !== "}") {
+      isStatic = false;
+      inGenerator = false;
+      context &= ~prodParams.preAsync;
+
+      if (state.tokens.next.value === "static" &&
+        !checkPunctuator(peek(), "(")) {
+        isStatic = true;
+        advance();
+      }
+
+      if (state.tokens.next.value === "async") {
+        if (!checkPunctuator(peek(), "(")) {
+          context |= prodParams.preAsync;
+          advance();
+
+          nolinebreak(state.tokens.curr);
+
+          if (checkPunctuator(state.tokens.next, "*")) {
+            inGenerator = true;
+            advance("*");
+
+            if (!state.inES9()) {
+              warning("W119", state.tokens.next, "async generators", "9");
+            }
+          }
+
+          if (!state.inES8()) {
+            warning("W119", state.tokens.curr, "async functions", "8");
+          }
+        }
+      }
+
+      if (state.tokens.next.value === "*") {
+        inGenerator = true;
+        advance();
+      }
+
+      token = state.tokens.next;
+
+      if ((token.value === "set" || token.value === "get") && !checkPunctuator(peek(), "(")) {
+        if (inGenerator) {
+          /* istanbul ignore next */
+          error("E024", token, token.value);
+        }
+        accessorType = token.value;
+        advance();
+        token = state.tokens.next;
+
+        if (!isStatic && token.value === "constructor") {
+          error("E049", token, "class " + accessorType + "ter method", token.value);
+        } else if (isStatic && token.value === "prototype") {
+          error("E049", token, "static class " + accessorType + "ter method", token.value);
+        }
+      } else {
+        accessorType = null;
+      }
+
+      switch (token.value) {
+        case ";":
+          warning("W032", token);
+          advance();
+          break;
+        case "constructor":
+          if (isStatic) {
+            // treat like a regular method -- static methods can be called 'constructor'
+            name = propertyName(context);
+            saveProperty(props, name, token, true, isStatic);
+            doMethod(classToken, context, name, inGenerator);
+          } else {
+            if (inGenerator || context & prodParams.preAsync) {
+              error("E024", token, token.value);
+            } else if (hasConstructor) {
+              /* istanbul ignore next */
+              error("E024", token, token.value);
+            } else {
+              hasConstructor = !accessorType && !isStatic;
+            }
+            advance();
+            doMethod(classToken, context, state.nameStack.infer());
+          }
+          break;
+        case "[":
+          name = computedPropertyName(context);
+          doMethod(classToken, context, name, inGenerator);
+          // We don't check names (via calling saveProperty()) of computed expressions like ["Symbol.iterator"]()
+          break;
+        default:
+          name = propertyName(context);
+          if (name === undefined) {
+            error("E024", token, token.value);
+            advance();
+            break;
+          }
+
+          if (accessorType) {
+            saveAccessor(accessorType, props, name, token, true, isStatic);
+            name = state.nameStack.infer();
+          } else {
+            if (isStatic && name === "prototype") {
+              error("E049", token, "static class method", name);
+            }
+
+            saveProperty(props, name, token, true, isStatic);
+          }
+
+          doMethod(classToken, context, name, inGenerator);
+          break;
+      }
+    }
+    advance("}");
+    checkProperties(props);
+
+    state.inClassBody = false;
+    state.funct["(scope)"].unstack();
+  }
+
+  function doMethod(classToken, context, name, generator) {
+    if (generator) {
+      if (!state.inES6()) {
+        warning("W119", state.tokens.curr, "function*", "6");
+      }
+    }
+
+    if (state.tokens.next.value !== "(") {
+      error("E054", state.tokens.next, state.tokens.next.value);
+      advance();
+      if (state.tokens.next.value === "{") {
+        // manually cheating the test "invalidClasses", which asserts this particular behavior when a class is misdefined.
+        advance();
+        if (state.tokens.next.value === "}") {
+          warning("W116", state.tokens.next, "(", state.tokens.next.value);
+          advance();
+          identifier(context);
+          advance();
+        }
+        /* istanbul ignore next */
+        return;
+      } else {
+        while (state.tokens.next.value !== "(") {
+          advance();
+        }
+      }
+    }
+
+    doFunction(context, { name: name,
+        type: generator ? "generator" : null,
+        isMethod: true,
+        statement: classToken });
+  }
+
+  prefix("void").exps = true;
+
+  infix(".", function(context, left, that) {
+    var m = identifier(context, true);
+
+    if (typeof m === "string") {
+      countMember(m);
+    }
+
+    that.left = left;
+    that.right = m;
+
+    if (m && m === "hasOwnProperty" && state.tokens.next.value === "=") {
+      warning("W001");
+    }
+
+    if (left && left.value === "arguments" && (m === "callee" || m === "caller")) {
+      if (state.option.noarg)
+        warning("W059", left, m);
+      else if (state.isStrict())
+        error("E008");
+    } else if (!state.option.evil && left && left.value === "document" &&
+        (m === "write" || m === "writeln")) {
+      warning("W060", left);
+    }
+
+    if (!state.option.evil && (m === "eval" || m === "execScript")) {
+      if (isGlobalEval(left, state)) {
+        warning("W061");
+      }
+    }
+
+    return that;
+  }, 160, true);
+
+  infix("(", function(context, left, that) {
+    if (state.option.immed && left && !left.immed && left.id === "function") {
+      warning("W062");
+    }
+
+    if (state.option.asi && checkPunctuators(state.tokens.prev, [")", "]"]) &&
+      !sameLine(state.tokens.prev, state.tokens.curr)) {
+      warning("W014", state.tokens.curr, state.tokens.curr.id);
+    }
+
+    var n = 0;
+    var p = [];
+
+    if (left) {
+      if (left.type === "(identifier)") {
+        if (left.value.match(/^[A-Z]([A-Z0-9_$]*[a-z][A-Za-z0-9_$]*)?$/)) {
+          if ("Array Number String Boolean Date Object Error Symbol".indexOf(left.value) === -1) {
+            if (left.value === "Math") {
+              /* istanbul ignore next */
+              warning("W063", left);
+            } else if (state.option.newcap) {
+              warning("W064", left);
+            }
+          }
+        }
+      }
+    }
+
+    if (state.tokens.next.id !== ")") {
+      for (;;) {
+        spreadrest("spread");
+
+        p[p.length] = expression(context, 10);
+        n += 1;
+        if (state.tokens.next.id !== ",") {
+          break;
+        }
+        advance(",");
+        checkComma({ allowTrailing: true });
+
+        if (state.tokens.next.id === ")") {
+          if (!state.inES8()) {
+            warning("W119", state.tokens.curr, "Trailing comma in arguments lists", "8");
+          }
+
+          break;
+        }
+      }
+    }
+
+    advance(")");
+
+    if (typeof left === "object") {
+      if (!state.inES5() && left.value === "parseInt" && n === 1) {
+        warning("W065", state.tokens.curr);
+      }
+      if (!state.option.evil) {
+        if (left.value === "eval" || left.value === "Function" ||
+            left.value === "execScript") {
+          warning("W061", left);
+
+          // This conditional expression was initially implemented with a typo
+          // which prevented the branch's execution in all cases. While
+          // enabling the code will produce behavior that is consistent with
+          // the other forms of code evaluation that follow, such a change is
+          // also technically incompatable with prior versions of JSHint (due
+          // to the fact that the behavior was never formally documented). This
+          // branch should be enabled as part of a major release.
+          //if (p[0] && p[0].id === "(string)") {
+          //  addEvalCode(left, p[0]);
+          //}
+        } else if (p[0] && p[0].id === "(string)" &&
+             (left.value === "setTimeout" ||
+            left.value === "setInterval")) {
+          warning("W066", left);
+          addEvalCode(left, p[0]);
+
+        // window.setTimeout/setInterval
+        } else if (p[0] && p[0].id === "(string)" &&
+             left.value === "." &&
+             left.left.value === "window" &&
+             (left.right === "setTimeout" ||
+            left.right === "setInterval")) {
+          warning("W066", left);
+          addEvalCode(left, p[0]);
+        }
+      }
+      if (!left.identifier && left.id !== "." && left.id !== "[" && left.id !== "=>" &&
+          left.id !== "(" && left.id !== "&&" && left.id !== "||" && left.id !== "?" &&
+          left.id !== "async" && !(state.inES6() && left["(name)"])) {
+        warning("W067", that);
+      }
+    }
+
+    that.left = left;
+    return that;
+  }, 155, true).exps = true;
+
+  function peekThroughParens(parens) {
+    var pn = state.tokens.next;
+    var i = -1;
+    var pn1;
+
+    do {
+      if (pn.value === "(") {
+        parens += 1;
+      } else if (pn.value === ")") {
+        parens -= 1;
+      }
+
+      i += 1;
+      pn1 = pn;
+      pn = peek(i);
+    } while (!(parens === 0 && pn1.value === ")") && pn.type !== "(end)");
+
+    return pn;
+  }
+
+  prefix("(", function(context, rbp) {
+    var ret, triggerFnExpr, first, last;
+    var opening = state.tokens.curr;
+    var preceeding = state.tokens.prev;
+    var isNecessary = !state.option.singleGroups;
+    var pn = peekThroughParens(1);
+
+    if (state.tokens.next.id === "function") {
+      triggerFnExpr = state.tokens.next.immed = true;
+    }
+
+    // If the balanced grouping operator is followed by a "fat arrow", the
+    // current token marks the beginning of a "fat arrow" function and parsing
+    // should proceed accordingly.
+    if (pn.value === "=>") {
+      pn.funct = doFunction(context, { type: "arrow", parsedOpening: true });
+      return pn;
+    }
+
+    // The ECMA262 grammar requires an expression between the "opening
+    // parenthesis" and "close parenthesis" tokens of the grouping operator.
+    // However, the "ignore" directive is commonly used to inject values that
+    // are not included in the token stream. For example:
+    //
+    //     return (
+    //       /*jshint ignore:start */
+    //       <div></div>
+    //       /*jshint ignore:end */
+    //     );
+    //
+    // The "empty" grouping operator is permitted in order to tolerate this
+    // pattern.
+    if (state.tokens.next.id === ")") {
+      advance(")");
+      return;
+    }
+
+    ret = expression(context, 0);
+
+    advance(")", this);
+
+    if (!ret) {
+      return;
+    }
+
+    ret.paren = true;
+
+    if (state.option.immed && ret && ret.id === "function") {
+      if (state.tokens.next.id !== "(" &&
+        state.tokens.next.id !== "." && state.tokens.next.id !== "[") {
+        warning("W068", this);
+      }
+    }
+
+    if (ret.id === ",") {
+      first = ret.left;
+      while (first.id === ",") {
+        first = first.left;
+      }
+
+      last = ret.right;
+    } else {
+      first = last = ret;
+
+      if (!isNecessary) {
+        // async functions are identified after parsing due to the complexity
+        // of disambiguating the `async` keyword.
+        if (!triggerFnExpr) {
+          triggerFnExpr = ret.id === "async";
+        }
+
+        isNecessary =
+          // Used to distinguish from an ExpressionStatement which may not
+          // begin with the `{` and `function` tokens
+          (opening.beginsStmt && (ret.id === "{" || triggerFnExpr)) ||
+          // Used to signal that a function expression is being supplied to
+          // some other operator.
+          (triggerFnExpr &&
+            // For parenthesis wrapping a function expression to be considered
+            // necessary, the grouping operator should be the left-hand-side of
+            // some other operator--either within the parenthesis or directly
+            // following them.
+            (!isEndOfExpr() || state.tokens.prev.id !== "}")) ||
+          // Used to demarcate an arrow function as the left-hand side of some
+          // operator.
+          (ret.id === "=>" && !isEndOfExpr()) ||
+          // Used as the return value of a single-statement arrow function
+          (ret.id === "{" && preceeding.id === "=>") ||
+          // Used to cover a unary expression as the left-hand side of the
+          // exponentiation operator
+          (beginsUnaryExpression(ret) && state.tokens.next.id === "**") ||
+          // Used to delineate an integer number literal from a dereferencing
+          // punctuator (otherwise interpreted as a decimal point)
+          (ret.type === "(number)" &&
+            checkPunctuator(pn, ".") && /^\d+$/.test(ret.value)) ||
+          // Used to wrap object destructuring assignment
+          (opening.beginsStmt && ret.id === "=" && ret.left.id === "{");
+      }
+    }
+
+    // The operator may be necessary to override the default binding power of
+    // neighboring operators (whenever there is an operator in use within the
+    // first expression *or* the current group contains multiple expressions)
+    if (!isNecessary && (isOperator(first) || first !== last)) {
+      isNecessary =
+        (rbp > first.lbp) ||
+        (rbp > 0 && rbp === first.lbp) ||
+        (!isEndOfExpr() && last.rbp < state.tokens.next.lbp);
+    }
+
+    if (!isNecessary) {
+      warning("W126", opening);
+    }
+
+    return ret;
+  });
+
+  application("=>");
+
+  infix("[", function(context, left, that) {
+    var e, s, canUseDot;
+
+    if (state.option.asi && checkPunctuators(state.tokens.prev, [")", "]"]) &&
+      !sameLine(state.tokens.prev, state.tokens.curr)) {
+      warning("W014", state.tokens.curr, state.tokens.curr.id);
+    }
+
+    e = expression(context & ~prodParams.noin, 10);
+
+    if (e && e.type === "(string)") {
+      if (!state.option.evil && (e.value === "eval" || e.value === "execScript")) {
+        if (isGlobalEval(left, state)) {
+          warning("W061");
+        }
+      }
+
+      countMember(e.value);
+      if (!state.option.sub && reg.identifier.test(e.value)) {
+        s = state.syntax[e.value];
+
+        if (s) {
+          canUseDot = !isReserved(context, s);
+        } else {
+          // This branch exists to preserve legacy behavior with version 2.9.5
+          // and earlier. In those releases, `eval` and `arguments` were
+          // incorrectly interpreted as reserved keywords, so Member
+          // Expressions such as `object["eval"]` did not trigger warning W069.
+          //
+          // TODO: Remove in JSHint 3
+          canUseDot = e.value !== "eval" && e.value !== "arguments";
+        }
+
+        if (canUseDot) {
+          warning("W069", state.tokens.prev, e.value);
+        }
+      }
+    }
+    advance("]", that);
+
+    if (e && e.value === "hasOwnProperty" && state.tokens.next.value === "=") {
+      warning("W001");
+    }
+
+    that.left = left;
+    that.right = e;
+    return that;
+  }, 160, true);
+
+  function comprehensiveArrayExpression(context) {
+    var res = {};
+    res.exps = true;
+    state.funct["(comparray)"].stack();
+
+    // Handle reversed for expressions, used in spidermonkey
+    var reversed = false;
+    if (state.tokens.next.value !== "for") {
+      reversed = true;
+      if (!state.inMoz()) {
+        warning("W116", state.tokens.next, "for", state.tokens.next.value);
+      }
+      state.funct["(comparray)"].setState("use");
+      res.right = expression(context, 10);
+    }
+
+    advance("for");
+    if (state.tokens.next.value === "each") {
+      advance("each");
+      if (!state.inMoz()) {
+        warning("W118", state.tokens.curr, "for each");
+      }
+    }
+    advance("(");
+    state.funct["(comparray)"].setState("define");
+    res.left = expression(context, 130);
+    if (_.includes(["in", "of"], state.tokens.next.value)) {
+      advance();
+    } else {
+      /* istanbul ignore next */
+      error("E045", state.tokens.curr);
+    }
+    state.funct["(comparray)"].setState("generate");
+    expression(context, 10);
+
+    advance(")");
+    if (state.tokens.next.value === "if") {
+      advance("if");
+      advance("(");
+      state.funct["(comparray)"].setState("filter");
+      expression(context, 10);
+      advance(")");
+    }
+
+    if (!reversed) {
+      state.funct["(comparray)"].setState("use");
+      res.right = expression(context, 10);
+    }
+
+    advance("]");
+    state.funct["(comparray)"].unstack();
+    return res;
+  }
+
+  prefix("[", function(context) {
+    var blocktype = lookupBlockType();
+    if (blocktype.isCompArray) {
+      if (!state.option.esnext && !state.inMoz()) {
+        warning("W118", state.tokens.curr, "array comprehension");
+      }
+      return comprehensiveArrayExpression(context);
+    } else if (blocktype.isDestAssign) {
+      this.destructAssign = destructuringPattern(context, {
+          openingParsed: true,
+          assignment: true
+        });
+      return this;
+    }
+    var b = !sameLine(state.tokens.curr, state.tokens.next);
+    this.first = [];
+    if (b) {
+      indent += state.option.indent;
+      if (state.tokens.next.from === indent + state.option.indent) {
+        /* istanbul ignore next */
+        indent += state.option.indent;
+      }
+    }
+    while (state.tokens.next.id !== "(end)") {
+      while (state.tokens.next.id === ",") {
+        if (!state.option.elision) {
+          if (!state.inES5()) {
+            // Maintain compat with old options --- ES5 mode without
+            // elision=true will warn once per comma
+            warning("W070");
+          } else {
+            warning("W128");
+            do {
+              advance(",");
+            } while (state.tokens.next.id === ",");
+            continue;
+          }
+        }
+        advance(",");
+      }
+
+      if (state.tokens.next.id === "]") {
+        break;
+      }
+
+      spreadrest("spread");
+
+      this.first.push(expression(context, 10));
+      if (state.tokens.next.id === ",") {
+        advance(",");
+        checkComma({ allowTrailing: true });
+        if (state.tokens.next.id === "]" && !state.inES5()) {
+          warning("W070", state.tokens.curr);
+          break;
+        }
+      } else {
+        if (state.option.trailingcomma && state.inES5()) {
+          warningAt("W140", state.tokens.curr.line, state.tokens.curr.character);
+        }
+        break;
+      }
+    }
+    if (b) {
+      indent -= state.option.indent;
+    }
+    advance("]", this);
+    return this;
+  });
+
+
+  function isMethod() {
+    return !!state.funct["(method)"];
+  }
+
+  function propertyName(context, preserveOrToken) {
+    var id;
+    var preserve = true;
+    if (typeof preserveOrToken === "object") {
+      /* istanbul ignore next */
+      id = preserveOrToken;
+    } else {
+      preserve = preserveOrToken;
+      id = optionalidentifier(context, true, preserve);
+    }
+
+    if (!id) {
+      if (state.tokens.next.id === "(string)") {
+        id = state.tokens.next.value;
+        if (!preserve) {
+          advance();
+        }
+      } else if (state.tokens.next.id === "(number)") {
+        id = state.tokens.next.value.toString();
+        if (!preserve) {
+          advance();
+        }
+      }
+    /* istanbul ignore next */
+    } else if (typeof id === "object") {
+      if (id.id === "(string)" || id.id === "(identifier)") id = id.value;
+      else if (id.id === "(number)") id = id.value.toString();
+    }
+
+    if (id === "hasOwnProperty") {
+      warning("W001");
+    }
+
+    return id;
+  }
+
+  /**
+   * @param {Number} context The parsing context
+   * @param {Object} [options]
+   * @param {token} [options.loneArg] The argument to the function in cases
+   *                                  where it was defined using the
+   *                                  single-argument shorthand.
+   * @param {bool} [options.parsedOpening] Whether the opening parenthesis has
+   *                                       already been parsed.
+   *
+   * @returns {{ arity: number, params: Array.<string>, isSimple: boolean }}
+   */
+  function functionparams(context, options) {
+    var next;
+    var paramsIds = [];
+    var ident;
+    var tokens = [];
+    var t;
+    var pastDefault = false;
+    var pastRest = false;
+    var arity = 0;
+    var loneArg = options && options.loneArg;
+    var hasDestructuring = false;
+
+    if (loneArg && loneArg.identifier === true) {
+      state.funct["(scope)"].addParam(loneArg.value, loneArg);
+      return { arity: 1, params: [ loneArg.value ], isSimple: true };
+    }
+
+    next = state.tokens.next;
+
+    if (!options || !options.parsedOpening) {
+      advance("(");
+    }
+
+    if (state.tokens.next.id === ")") {
+      advance(")");
+      return;
+    }
+
+    function addParam(addParamArgs) {
+      state.funct["(scope)"].addParam.apply(state.funct["(scope)"], addParamArgs);
+    }
+
+    for (;;) {
+      arity++;
+      // are added to the param scope
+      var currentParams = [];
+
+      pastRest = spreadrest("rest");
+
+      if (_.includes(["{", "["], state.tokens.next.id)) {
+        hasDestructuring = true;
+        tokens = destructuringPattern(context);
+        for (t in tokens) {
+          t = tokens[t];
+          if (t.id) {
+            paramsIds.push(t.id);
+            currentParams.push([t.id, t.token]);
+          }
+        }
+      } else {
+        ident = identifier(context);
+
+        if (ident) {
+          paramsIds.push(ident);
+          currentParams.push([ident, state.tokens.curr]);
+        } else {
+          // Skip invalid parameter.
+          while (!checkPunctuators(state.tokens.next, [",", ")"])) advance();
+        }
+      }
+
+      // It is valid to have a regular argument after a default argument
+      // since undefined can be used for missing parameters. Still warn as it is
+      // a possible code smell.
+      if (pastDefault) {
+        if (state.tokens.next.id !== "=") {
+          error("W138", state.tokens.curr);
+        }
+      }
+      if (state.tokens.next.id === "=") {
+        if (!state.inES6()) {
+          warning("W119", state.tokens.next, "default parameters", "6");
+        }
+
+        if (pastRest) {
+          error("E062", state.tokens.next);
+        }
+
+        advance("=");
+        pastDefault = true;
+        expression(context, 10);
+      }
+
+      // now we have evaluated the default expression, add the variable to the param scope
+      currentParams.forEach(addParam);
+      if (state.tokens.next.id === ",") {
+        if (pastRest) {
+          warning("W131", state.tokens.next);
+        }
+        advance(",");
+        checkComma({ allowTrailing: true });
+      }
+
+      if (state.tokens.next.id === ")") {
+        if (state.tokens.curr.id === "," && !state.inES8()) {
+          warning("W119", state.tokens.curr, "Trailing comma in function parameters", "8");
+        }
+
+        advance(")", next);
+        return {
+          arity: arity,
+          params: paramsIds,
+          isSimple: !hasDestructuring && !pastRest && !pastDefault
+        };
+      }
+    }
+  }
+
+  /**
+   * Factory function for creating objects used to track statistics of function
+   * literals.
+   *
+   * @param {string} name - the identifier name to associate with the function
+   * @param {object} [token] - token responsible for creating the function
+   *                           object
+   * @param {object} [overwrites] - a collection of properties that should
+   *                                override the corresponding default value of
+   *                                the new "functor" object
+   */
+  function functor(name, token, overwrites) {
+    var funct = {
+      "(name)"      : name,
+      "(breakage)"  : 0,
+      "(loopage)"   : 0,
+      // The strictness of the function body is tracked via a dedicated
+      // property (as opposed to via the global `state` object) so that the
+      // value can be referenced after the body has been fully parsed (i.e.
+      // when validating the identifier used in function declarations and
+      // function expressions).
+      "(isStrict)"  : "unknown",
+
+      "(global)"    : false,
+
+      "(line)"      : null,
+      "(character)" : null,
+      "(metrics)"   : null,
+      "(statement)" : null,
+      "(context)"   : null,
+      "(scope)"     : null,
+      "(comparray)" : null,
+      "(yielded)"   : null,
+      "(arrow)"     : null,
+      "(async)"     : null,
+      "(params)"    : null
+    };
+
+    if (token) {
+      _.extend(funct, {
+        "(line)"     : token.line,
+        "(character)": token.character,
+        "(metrics)"  : createMetrics(token)
+      });
+    }
+
+    _.extend(funct, overwrites);
+
+    if (funct["(context)"]) {
+      funct["(scope)"] = funct["(context)"]["(scope)"];
+      funct["(comparray)"]  = funct["(context)"]["(comparray)"];
+    }
+
+    return funct;
+  }
+
+  /**
+   * Determine if the parser has begun parsing executable code.
+   *
+   * @param {Token} funct - The current "functor" token
+   *
+   * @returns {boolean}
+   */
+  function hasParsedCode(funct) {
+    return funct["(global)"] && !funct["(verb)"];
+  }
+
+  /**
+   * This function is used as both a null-denotation method *and* a
+   * left-denotation method, meaning the first parameter is overloaded.
+   */
+  function doTemplateLiteral(context, leftOrRbp) {
+    // ASSERT: this.type === "(template)"
+    // jshint validthis: true
+    var ctx = this.context;
+    var noSubst = this.noSubst;
+    var depth = this.depth;
+    var left = typeof leftOrRbp === "number" ? null : leftOrRbp;
+
+    if (!noSubst) {
+      while (!end()) {
+        if (!state.tokens.next.template || state.tokens.next.depth > depth) {
+          expression(context, 0); // should probably have different rbp?
+        } else {
+          // skip template start / middle
+          advance();
+        }
+      }
+    }
+
+    return {
+      id: "(template)",
+      type: "(template)",
+      tag: left
+    };
+
+    function end() {
+      if (state.tokens.curr.template && state.tokens.curr.tail &&
+          state.tokens.curr.context === ctx) {
+        /* istanbul ignore next */
+        return true;
+      }
+      var complete = (state.tokens.next.template && state.tokens.next.tail &&
+                      state.tokens.next.context === ctx);
+      if (complete) advance();
+      return complete || state.tokens.next.isUnclosed;
+    }
+  }
+
+  /**
+   * Parse a function literal.
+   *
+   * @param {Number} context The parsing context
+   * @param {Object} [options]
+   * @param {string} [options.name] The identifier belonging to the function (if
+   *                                any)
+   * @param {token} [options.statement] The statement that triggered creation
+   *                                    of the current function.
+   * @param {string} [options.type] If specified, either "generator" or "arrow"
+   * @param {token} [options.loneArg] The argument to the function in cases
+   *                                  where it was defined using the
+   *                                  single-argument shorthand
+   * @param {bool} [options.parsedOpening] Whether the opening parenthesis has
+   *                                       already been parsed
+   * @param {string} [options.classExprBinding] Define a function with this
+   *                                            identifier in the new function's
+   *                                            scope, mimicking the bahavior of
+   *                                            class expression names within
+   *                                            the body of member functions.
+   */
+  function doFunction(context, options) {
+    var f, token, name, statement, classExprBinding, isGenerator, isArrow,
+      isMethod, ignoreLoopFunc;
+    var oldOption = state.option;
+    var oldIgnored = state.ignored;
+    var isAsync = context & prodParams.preAsync;
+
+    if (options) {
+      name = options.name;
+      statement = options.statement;
+      classExprBinding = options.classExprBinding;
+      isGenerator = options.type === "generator";
+      isArrow = options.type === "arrow";
+      isMethod = options.isMethod;
+      ignoreLoopFunc = options.ignoreLoopFunc;
+    }
+
+    context &= ~prodParams.noin;
+    context &= ~prodParams.tryClause;
+
+    if (isAsync) {
+      context |= prodParams.async;
+    } else {
+      context &= ~prodParams.async;
+    }
+
+    if (isGenerator) {
+      context |= prodParams.yield;
+    } else if (!isArrow) {
+      context &= ~prodParams.yield;
+    }
+    context &= ~prodParams.preAsync;
+
+    state.option = Object.create(state.option);
+    state.ignored = Object.create(state.ignored);
+
+    state.funct = functor(name || state.nameStack.infer(), state.tokens.next, {
+      "(statement)": statement,
+      "(context)":   state.funct,
+      "(arrow)":     isArrow,
+      "(method)":    isMethod,
+      "(async)":     isAsync
+    });
+
+    f = state.funct;
+    token = state.tokens.curr;
+
+    functions.push(state.funct);
+
+    // So that the function is available to itself and referencing itself is not
+    // seen as a closure, add the function name to a new scope, but do not
+    // test for unused (unused: false)
+    // it is a new block scope so that params can override it, it can be block scoped
+    // but declarations inside the function don't cause already declared error
+    state.funct["(scope)"].stack("functionouter");
+    var internallyAccessibleName = !isMethod && (name || classExprBinding);
+    if (internallyAccessibleName) {
+      state.funct["(scope)"].block.add(internallyAccessibleName,
+        classExprBinding ? "class" : "function", state.tokens.curr, false);
+    }
+
+    if (!isArrow) {
+      state.funct["(scope)"].funct.add("arguments", "var", token, false);
+    }
+
+    // create the param scope (params added in functionparams)
+    state.funct["(scope)"].stack("functionparams");
+
+    var paramsInfo = functionparams(context, options);
+
+    if (paramsInfo) {
+      state.funct["(params)"] = paramsInfo.params;
+      state.funct["(hasSimpleParams)"] = paramsInfo.isSimple;
+      state.funct["(metrics)"].arity = paramsInfo.arity;
+      state.funct["(metrics)"].verifyMaxParametersPerFunction();
+    } else {
+      state.funct["(params)"] = [];
+      state.funct["(metrics)"].arity = 0;
+      state.funct["(hasSimpleParams)"] = true;
+    }
+
+    if (isArrow) {
+      context &= ~prodParams.yield;
+
+      if (!state.inES6(true)) {
+        warning("W119", state.tokens.curr, "arrow function syntax (=>)", "6");
+      }
+
+      if (!options.loneArg) {
+        advance("=>");
+      }
+    }
+
+    block(context, false, true, true, isArrow);
+
+    if (!state.option.noyield && isGenerator && !state.funct["(yielded)"]) {
+      warning("W124", state.tokens.curr);
+    }
+
+    state.funct["(metrics)"].verifyMaxStatementsPerFunction();
+    state.funct["(metrics)"].verifyMaxComplexityPerFunction();
+    state.funct["(unusedOption)"] = state.option.unused;
+    state.option = oldOption;
+    state.ignored = oldIgnored;
+    state.funct["(last)"] = state.tokens.curr.line;
+    state.funct["(lastcharacter)"] = state.tokens.curr.character;
+
+    // unstack the params scope
+    state.funct["(scope)"].unstack(); // also does usage and label checks
+
+    // unstack the function outer stack
+    state.funct["(scope)"].unstack();
+
+    state.funct = state.funct["(context)"];
+
+    if (!ignoreLoopFunc && !state.option.loopfunc && state.funct["(loopage)"]) {
+      // If the function we just parsed accesses any non-local variables
+      // trigger a warning. Otherwise, the function is safe even within
+      // a loop.
+      if (f["(outerMutables)"]) {
+        warning("W083", token, f["(outerMutables)"].join(", "));
+      }
+    }
+
+    return f;
+  }
+
+  function createMetrics(functionStartToken) {
+    return {
+      statementCount: 0,
+      nestedBlockDepth: -1,
+      ComplexityCount: 1,
+      arity: 0,
+
+      verifyMaxStatementsPerFunction: function() {
+        if (state.option.maxstatements &&
+          this.statementCount > state.option.maxstatements) {
+          warning("W071", functionStartToken, this.statementCount);
+        }
+      },
+
+      verifyMaxParametersPerFunction: function() {
+        if (_.isNumber(state.option.maxparams) &&
+          this.arity > state.option.maxparams) {
+          warning("W072", functionStartToken, this.arity);
+        }
+      },
+
+      verifyMaxNestedBlockDepthPerFunction: function() {
+        if (state.option.maxdepth &&
+          this.nestedBlockDepth > 0 &&
+          this.nestedBlockDepth === state.option.maxdepth + 1) {
+          warning("W073", null, this.nestedBlockDepth);
+        }
+      },
+
+      verifyMaxComplexityPerFunction: function() {
+        var max = state.option.maxcomplexity;
+        var cc = this.ComplexityCount;
+        if (max && cc > max) {
+          warning("W074", functionStartToken, cc);
+        }
+      }
+    };
+  }
+
+  function increaseComplexityCount() {
+    state.funct["(metrics)"].ComplexityCount += 1;
+  }
+
+  // Parse assignments that were found instead of conditionals.
+  // For example: if (a = 1) { ... }
+
+  function checkCondAssignment(token) {
+    if (!token || token.paren) {
+      return;
+    }
+
+    if (token.id === ",") {
+      checkCondAssignment(token.right);
+      return;
+    }
+
+    switch (token.id) {
+    case "=":
+    case "+=":
+    case "-=":
+    case "*=":
+    case "%=":
+    case "&=":
+    case "|=":
+    case "^=":
+    case "/=":
+      if (!state.option.boss) {
+        warning("W084", token);
+      }
+    }
+  }
+
+  /**
+   * Validate the properties defined within an object literal or class body.
+   * See the `saveAccessor` and `saveProperty` functions for more detail.
+   *
+   * @param {object} props - Collection of objects describing the properties
+   *                         encountered
+   */
+  function checkProperties(props) {
+    // Check for lonely setters if in the ES5 mode.
+    if (state.inES5()) {
+      for (var name in props) {
+        if (props[name] && props[name].setterToken && !props[name].getterToken &&
+          !props[name].static) {
+          warning("W078", props[name].setterToken);
+        }
+      }
+    }
+  }
+
+  function metaProperty(context, name, c) {
+    if (checkPunctuator(state.tokens.next, ".")) {
+      var left = state.tokens.curr.id;
+      advance(".");
+      var id = identifier(context);
+      state.tokens.curr.isMetaProperty = true;
+      if (name !== id) {
+        error("E057", state.tokens.prev, left, id);
+      } else {
+        c();
+      }
+      return state.tokens.curr;
+    }
+  }
+
+//object literals
+  (function(x) {
+    x.nud = function(context) {
+      var b, f, i, params, t, isGeneratorMethod = false, nextVal;
+      var props = Object.create(null); // All properties, including accessors
+      var isAsyncMethod = false;
+
+      b = !sameLine(state.tokens.curr, state.tokens.next);
+      if (b) {
+        indent += state.option.indent;
+        if (state.tokens.next.from === indent + state.option.indent) {
+          /* istanbul ignore next */
+          indent += state.option.indent;
+        }
+      }
+
+      var blocktype = lookupBlockType();
+      if (blocktype.isDestAssign) {
+        this.destructAssign = destructuringPattern(context, {
+            openingParsed: true,
+            assignment: true
+          });
+        return this;
+      }
+      state.inObjectBody = true;
+      for (;;) {
+        if (state.tokens.next.id === "}") {
+          break;
+        }
+
+        nextVal = state.tokens.next.value;
+        if (state.tokens.next.identifier &&
+            (peekIgnoreEOL().id === "," || peekIgnoreEOL().id === "}")) {
+          if (!state.inES6()) {
+            warning("W104", state.tokens.next, "object short notation", "6");
+          }
+          i = propertyName(context, true);
+          saveProperty(props, i, state.tokens.next);
+
+          expression(context, 10);
+
+        } else if (peek().id !== ":" && (nextVal === "get" || nextVal === "set")) {
+          advance(nextVal);
+
+          if (!state.inES5()) {
+            error("E034");
+          }
+
+          if (state.tokens.next.id === "[") {
+            i = computedPropertyName(context);
+          } else {
+            i = propertyName(context);
+
+            // ES6 allows for get() {...} and set() {...} method
+            // definition shorthand syntax, so we don't produce an error
+            // if linting ECMAScript 6 code.
+            if (!i && !state.inES6()) {
+              error("E035");
+            }
+          }
+
+          // We don't want to save this getter unless it's an actual getter
+          // and not an ES6 concise method
+          if (i) {
+            saveAccessor(nextVal, props, i, state.tokens.curr);
+          }
+
+          t = state.tokens.next;
+          f = doFunction(context, { isMethod: true });
+          params = f["(params)"];
+
+          // Don't warn about getter/setter pairs if this is an ES6 concise method
+          if (nextVal === "get" && i && params.length) {
+            warning("W076", t, params[0], i);
+          } else if (nextVal === "set" && i && f["(metrics)"].arity !== 1) {
+            warning("W077", t, i);
+          }
+
+        } else if (spreadrest("spread")) {
+          if (!state.inES9()) {
+            warning("W119", state.tokens.next, "object spread property", "9");
+          }
+
+          expression(context, 10);
+        } else {
+          if (state.tokens.next.id === "async" && !checkPunctuators(peek(), ["(", ":"])) {
+            if (!state.inES8()) {
+              warning("W119", state.tokens.next, "async functions", "8");
+            }
+
+            isAsyncMethod = true;
+            advance();
+
+            nolinebreak(state.tokens.curr);
+          } else {
+            isAsyncMethod = false;
+          }
+
+          if (state.tokens.next.value === "*" && state.tokens.next.type === "(punctuator)") {
+            if (isAsyncMethod && !state.inES9()) {
+              warning("W119", state.tokens.next, "async generators", "9");
+            } else if (!state.inES6()) {
+              warning("W104", state.tokens.next, "generator functions", "6");
+            }
+
+            advance("*");
+            isGeneratorMethod = true;
+          } else {
+            isGeneratorMethod = false;
+          }
+
+          if (state.tokens.next.id === "[") {
+            i = computedPropertyName(context);
+            state.nameStack.set(i);
+          } else {
+            state.nameStack.set(state.tokens.next);
+            i = propertyName(context);
+            saveProperty(props, i, state.tokens.next);
+
+            if (typeof i !== "string") {
+              break;
+            }
+          }
+
+          if (state.tokens.next.value === "(") {
+            if (!state.inES6()) {
+              warning("W104", state.tokens.curr, "concise methods", "6");
+            }
+
+            doFunction(isAsyncMethod ? context | prodParams.preAsync : context, {
+              isMethod: true,
+              type: isGeneratorMethod ? "generator" : null
+            });
+          } else {
+            advance(":");
+            expression(context, 10);
+          }
+        }
+
+        countMember(i);
+
+        if (state.tokens.next.id === ",") {
+          advance(",");
+          checkComma({ allowTrailing: true, property: true });
+          if (state.tokens.next.id === ",") {
+            /* istanbul ignore next */
+            warning("W070", state.tokens.curr);
+          } else if (state.tokens.next.id === "}" && !state.inES5()) {
+            warning("W070", state.tokens.curr);
+          }
+        } else {
+          if (state.option.trailingcomma && state.inES5()) {
+            warningAt("W140", state.tokens.curr.line, state.tokens.curr.character);
+          }
+          break;
+        }
+      }
+      if (b) {
+        indent -= state.option.indent;
+      }
+      advance("}", this);
+
+      checkProperties(props);
+      state.inObjectBody = false;
+
+      return this;
+    };
+    x.fud = function() {
+      /* istanbul ignore next */
+      error("E036", state.tokens.curr);
+    };
+  }(delim("{")));
+
+  function destructuringPattern(context, options) {
+    var isAssignment = options && options.assignment;
+
+    context &= ~prodParams.noin;
+
+    if (!state.inES6()) {
+      warning("W104", state.tokens.curr,
+        isAssignment ? "destructuring assignment" : "destructuring binding", "6");
+    }
+
+    return destructuringPatternRecursive(context, options);
+  }
+
+  function destructuringPatternRecursive(context, options) {
+    var ids, idx;
+    var identifiers = [];
+    var openingParsed = options && options.openingParsed;
+    var isAssignment = options && options.assignment;
+    var recursiveOptions = isAssignment ? { assignment: isAssignment } : null;
+    var firstToken = openingParsed ? state.tokens.curr : state.tokens.next;
+
+    var nextInnerDE = function() {
+      var ident;
+      if (checkPunctuators(state.tokens.next, ["[", "{"])) {
+        ids = destructuringPatternRecursive(context, recursiveOptions);
+        for (idx = 0; idx < ids.length; idx++) {
+          identifiers.push({ id: ids[idx].id, token: ids[idx].token });
+        }
+      } else if (checkPunctuator(state.tokens.next, ",")) {
+        identifiers.push({ id: null, token: state.tokens.curr });
+      } else if (checkPunctuator(state.tokens.next, "(")) {
+        advance("(");
+        nextInnerDE();
+        advance(")");
+      } else {
+        if (isAssignment) {
+          var assignTarget = expression(context, 20);
+          if (assignTarget) {
+            checkLeftSideAssign(context, assignTarget);
+
+            // if the target was a simple identifier, add it to the list to return
+            if (assignTarget.identifier) {
+              ident = assignTarget.value;
+            }
+          }
+        } else {
+          ident = identifier(context);
+        }
+        if (ident) {
+          identifiers.push({ id: ident, token: state.tokens.curr });
+        }
+      }
+    };
+
+    var assignmentProperty = function(context) {
+      var id, expr;
+
+      if (checkPunctuator(state.tokens.next, "[")) {
+        advance("[");
+        expression(context, 10);
+        advance("]");
+        advance(":");
+        nextInnerDE();
+      } else if (state.tokens.next.id === "(string)" ||
+                 state.tokens.next.id === "(number)") {
+        advance();
+        advance(":");
+        nextInnerDE();
+      } else {
+        // this id will either be the property name or the property name and the assigning identifier
+        var isRest = spreadrest("rest");
+
+        if (isRest) {
+          if (!state.inES9()) {
+            warning("W119", state.tokens.next, "object rest property", "9");
+          }
+
+          // Due to visual symmetry with the array rest property (and the early
+          // design of the language feature), developers may mistakenly assume
+          // any expression is valid in this position. If the next token is not
+          // an identifier, attempt to parse an expression and issue an error.
+          // order to recover more gracefully from this condition.
+          if (state.tokens.next.type === "(identifier)") {
+            id = identifier(context);
+          } else {
+            expr = expression(context, 10);
+            error("E030", expr, expr.value);
+          }
+        } else {
+          id = identifier(context);
+        }
+
+        if (!isRest && checkPunctuator(state.tokens.next, ":")) {
+          advance(":");
+          nextInnerDE();
+        } else if (id) {
+          // in this case we are assigning (not declaring), so check assignment
+          if (isAssignment) {
+            checkLeftSideAssign(context, state.tokens.curr);
+          }
+          identifiers.push({ id: id, token: state.tokens.curr });
+        }
+
+        if (isRest && checkPunctuator(state.tokens.next, ",")) {
+          warning("W130", state.tokens.next);
+        }
+      }
+    };
+
+    var id, value;
+    if (checkPunctuator(firstToken, "[")) {
+      if (!openingParsed) {
+        advance("[");
+      }
+      if (checkPunctuator(state.tokens.next, "]")) {
+        warning("W137", state.tokens.curr);
+      }
+      var element_after_rest = false;
+      while (!checkPunctuator(state.tokens.next, "]")) {
+        var isRest = spreadrest("rest");
+
+        nextInnerDE();
+
+        if (isRest && !element_after_rest &&
+            checkPunctuator(state.tokens.next, ",")) {
+          warning("W130", state.tokens.next);
+          element_after_rest = true;
+        }
+        if (!isRest && checkPunctuator(state.tokens.next, "=")) {
+          if (checkPunctuator(state.tokens.prev, "...")) {
+            /* istanbul ignore next */
+            advance("]");
+          } else {
+            advance("=");
+          }
+          id = state.tokens.prev;
+          value = expression(context, 10);
+          if (value && value.identifier && value.value === "undefined") {
+            warning("W080", id, id.value);
+          }
+        }
+        if (!checkPunctuator(state.tokens.next, "]")) {
+          advance(",");
+        }
+      }
+      advance("]");
+    } else if (checkPunctuator(firstToken, "{")) {
+
+      if (!openingParsed) {
+        advance("{");
+      }
+      if (checkPunctuator(state.tokens.next, "}")) {
+        warning("W137", state.tokens.curr);
+      }
+      while (!checkPunctuator(state.tokens.next, "}")) {
+        assignmentProperty(context);
+        if (checkPunctuator(state.tokens.next, "=")) {
+          advance("=");
+          id = state.tokens.prev;
+          value = expression(context, 10);
+          if (value && value.identifier && value.value === "undefined") {
+            warning("W080", id, id.value);
+          }
+        }
+        if (!checkPunctuator(state.tokens.next, "}")) {
+          advance(",");
+          if (checkPunctuator(state.tokens.next, "}")) {
+            // Trailing comma
+            // ObjectBindingPattern: { BindingPropertyList , }
+            break;
+          }
+        }
+      }
+      advance("}");
+    }
+    return identifiers;
+  }
+
+  function destructuringPatternMatch(tokens, value) {
+    var first = value.first;
+
+    if (!first)
+      return;
+
+    _.zip(tokens, Array.isArray(first) ? first : [ first ]).forEach(function(val) {
+      var token = val[0];
+      var value = val[1];
+
+      if (token && value)
+        token.first = value;
+      else if (token && token.first && !value)
+        /* istanbul ignore next */
+        warning("W080", token.first, token.first.value);
+    });
+  }
+
+  function blockVariableStatement(type, statement, context) {
+    // used for both let and const statements
+
+    var noin = context & prodParams.noin;
+    var inexport = context & prodParams.export;
+    var isLet = type === "let";
+    var isConst = type === "const";
+    var tokens, lone, value, letblock;
+
+    if (!state.inES6()) {
+      warning("W104", state.tokens.curr, type, "6");
+    }
+
+    if (isLet && isMozillaLet()) {
+      advance("(");
+      state.funct["(scope)"].stack();
+      letblock = true;
+      statement.declaration = false;
+    }
+
+    statement.first = [];
+    for (;;) {
+      var names = [];
+      if (_.includes(["{", "["], state.tokens.next.value)) {
+        tokens = destructuringPattern(context);
+        lone = false;
+      } else {
+        tokens = [ { id: identifier(context), token: state.tokens.curr } ];
+        lone = true;
+      }
+
+      // A `const` declaration without an initializer is permissible within the
+      // head of for-in and for-of statements. If this binding list is being
+      // parsed as part of a `for` statement of any kind, allow the initializer
+      // to be omitted. Although this may erroneously allow such forms from
+      // "C-style" `for` statements (i.e. `for (const x;;) {}`, the `for`
+      // statement logic includes dedicated logic to issue the error for such
+      // cases.
+      if (!noin && isConst && state.tokens.next.id !== "=") {
+        warning("E012", state.tokens.curr, state.tokens.curr.value);
+      }
+
+      for (var t in tokens) {
+        if (tokens.hasOwnProperty(t)) {
+          t = tokens[t];
+
+          // It is a Syntax Error if the BoundNames of BindingList contains
+          // "let".
+          if (t.id === "let") {
+            /* istanbul ignore next */
+            warning("W024", t.token, t.id);
+          }
+
+          if (state.funct["(scope)"].block.isGlobal()) {
+            if (predefined[t.id] === false) {
+              warning("W079", t.token, t.id);
+            }
+          }
+          if (t.id) {
+            state.funct["(scope)"].addbinding(t.id, {
+              type: type,
+              token: t.token });
+            names.push(t.token);
+          }
+        }
+      }
+
+      if (state.tokens.next.id === "=") {
+        statement.hasInitializer = true;
+
+        advance("=");
+        if (!noin && peek(0).id === "=" && state.tokens.next.identifier) {
+          warning("W120", state.tokens.next, state.tokens.next.value);
+        }
+        var id = state.tokens.prev;
+        value = expression(context, 10);
+        if (value) {
+          if (value.identifier && value.value === "undefined") {
+            warning("W080", id, id.value);
+          }
+          if (!lone) {
+            destructuringPatternMatch(names, value);
+          }
+        }
+      }
+
+      // Bindings are not immediately initialized in for-in and for-of
+      // statements. As with `const` initializers (described above), the `for`
+      // statement parsing logic includes
+      if (state.tokens.next.value !== "in" && state.tokens.next.value !== "of") {
+        for (t in tokens) {
+          if (tokens.hasOwnProperty(t)) {
+            t = tokens[t];
+            state.funct["(scope)"].initialize(t.id);
+
+            if (lone && inexport) {
+              state.funct["(scope)"].setExported(t.token.value, t.token);
+            }
+          }
+        }
+      }
+
+      statement.first = statement.first.concat(names);
+
+      if (state.tokens.next.id !== ",") {
+        break;
+      }
+
+      statement.hasComma = true;
+      advance(",");
+      checkComma();
+    }
+    if (letblock) {
+      advance(")");
+      block(context, true, true);
+      statement.block = true;
+      state.funct["(scope)"].unstack();
+    }
+
+    return statement;
+  }
+
+  var conststatement = stmt("const", function(context) {
+    return blockVariableStatement("const", this, context);
+  });
+  conststatement.exps = true;
+  conststatement.declaration = true;
+
+
+  /**
+   * Determine if the current `let` token designates the beginning of a "let
+   * block" or "let expression" as implemented in the Mozilla SpiderMonkey
+   * engine.
+   *
+   * This function will only return `true` if Mozilla extensions have been
+   * enabled. It would be preferable to detect the language feature regardless
+   * of the parser's state because this would allow JSHint to instruct users to
+   * enable the `moz` option where necessary. This is not possible because the
+   * language extension is not compatible with standard JavaScript. For
+   * example, the following program code may describe a "let block" or a
+   * function invocation:
+   *
+   *     let(x)
+   *     {
+   *       typeof x;
+   *     }
+   *
+   * @returns {boolean}
+   */
+  function isMozillaLet() {
+    return state.tokens.next.id === "(" && state.inMoz();
+  }
+  var letstatement = stmt("let", function(context) {
+    return blockVariableStatement("let", this, context);
+  });
+  letstatement.nud = function(context, rbp) {
+    if (isMozillaLet()) {
+      // create a new block scope we use only for the current expression
+      state.funct["(scope)"].stack();
+      advance("(");
+      state.tokens.prev.fud(context);
+      advance(")");
+      expression(context, rbp);
+      state.funct["(scope)"].unstack();
+    } else {
+      this.exps = false;
+      return state.syntax["(identifier)"].nud.apply(this, arguments);
+    }
+  };
+  letstatement.meta = { es5: true, isFutureReservedWord: false, strictOnly: true };
+  letstatement.exps = true;
+  letstatement.declaration = true;
+  letstatement.useFud = function(context) {
+    var next = state.tokens.next;
+    var nextIsBindingName;
+
+    if (this.line !== next.line && !state.inES6()) {
+      return false;
+    }
+
+    // JSHint generally interprets `let` as a reserved word even though it is
+    // not considered as such by the ECMAScript specification because doing so
+    // simplifies parsing logic. It is special-cased here so that code such as
+    //
+    //     let
+    //     let
+    //
+    // is correctly interpreted as an invalid LexicalBinding. (Without this
+    // consideration, the code above would be parsed as two
+    // IdentifierReferences.)
+    nextIsBindingName = next.identifier && (!isReserved(context, next) ||
+      next.id === "let");
+
+    return nextIsBindingName || checkPunctuators(next, ["{", "["]) ||
+      isMozillaLet();
+  };
+
+  var varstatement = stmt("var", function(context) {
+    var noin = context & prodParams.noin;
+    var inexport = context & prodParams.export;
+    var tokens, lone, value, id;
+
+    this.first = [];
+    for (;;) {
+      var names = [];
+      if (_.includes(["{", "["], state.tokens.next.value)) {
+        tokens = destructuringPattern(context);
+        lone = false;
+      } else {
+        tokens = [];
+        id = identifier(context);
+
+        if (id) {
+          tokens.push({ id: id, token: state.tokens.curr });
+        }
+
+        lone = true;
+      }
+
+      if (state.option.varstmt) {
+        warning("W132", this);
+      }
+
+
+      for (var t in tokens) {
+        if (tokens.hasOwnProperty(t)) {
+          t = tokens[t];
+          if (state.funct["(global)"] && !state.impliedClosure()) {
+            if (predefined[t.id] === false) {
+              warning("W079", t.token, t.id);
+            } else if (state.option.futurehostile === false) {
+              if ((!state.inES5() && vars.ecmaIdentifiers[5][t.id] === false) ||
+                (!state.inES6() && vars.ecmaIdentifiers[6][t.id] === false)) {
+                warning("W129", t.token, t.id);
+              }
+            }
+          }
+          if (t.id) {
+            state.funct["(scope)"].addbinding(t.id, {
+              type: "var",
+              token: t.token });
+
+            if (lone && inexport) {
+              state.funct["(scope)"].setExported(t.id, t.token);
+            }
+            names.push(t.token);
+          }
+        }
+      }
+
+      if (state.tokens.next.id === "=") {
+        this.hasInitializer = true;
+
+        state.nameStack.set(state.tokens.curr);
+
+        advance("=");
+        if (peek(0).id === "=" && state.tokens.next.identifier) {
+          if (!noin &&
+              !state.funct["(params)"] ||
+              state.funct["(params)"].indexOf(state.tokens.next.value) === -1) {
+            warning("W120", state.tokens.next, state.tokens.next.value);
+          }
+        }
+        id = state.tokens.prev;
+        value = expression(context, 10);
+        if (value) {
+          if (!state.funct["(loopage)"] && value.identifier &&
+            value.value === "undefined") {
+            warning("W080", id, id.value);
+          }
+          if (!lone) {
+            destructuringPatternMatch(names, value);
+          }
+        }
+      }
+
+      this.first = this.first.concat(names);
+
+      if (state.tokens.next.id !== ",") {
+        break;
+      }
+      this.hasComma = true;
+      advance(",");
+      checkComma();
+    }
+
+    return this;
+  });
+  varstatement.exps = true;
+
+  blockstmt("function", function(context) {
+    var inexport = context & prodParams.export;
+    var generator = false;
+    var isAsync = context & prodParams.preAsync;
+    var labelType = "";
+
+    if (isAsync) {
+      labelType = "async ";
+    }
+
+    if (state.tokens.next.value === "*") {
+      if (isAsync && !state.inES9()) {
+        warning("W119", state.tokens.prev, "async generators", "9");
+      } else if (!isAsync && !state.inES6(true)) {
+        warning("W119", state.tokens.next, "function*", "6");
+      }
+
+      advance("*");
+      labelType += "generator ";
+      generator = true;
+    }
+
+    labelType += "function";
+
+    if (inblock) {
+      warning("W082", state.tokens.curr);
+    }
+    var nameToken = optionalidentifier(context) ? state.tokens.curr : null;
+
+    if (!nameToken) {
+      if (!inexport) {
+        warning("W025");
+      }
+    } else {
+      state.funct["(scope)"].addbinding(nameToken.value, {
+        type: labelType,
+        token: state.tokens.curr,
+        initialized: true });
+
+      if (inexport) {
+        state.funct["(scope)"].setExported(nameToken.value, state.tokens.prev);
+      }
+    }
+
+    var f = doFunction(context, {
+      name: nameToken && nameToken.value,
+      statement: this,
+      type: generator ? "generator" : null,
+      ignoreLoopFunc: inblock // a declaration may already have warned
+    });
+
+    // If the function declaration is strict because the surrounding code is
+    // strict, the invalid name will trigger E008 when the scope manager
+    // attempts to create a binding in the strict environment record. An error
+    // should only be signaled here when the function itself enables strict
+    // mode (the scope manager will not report an error because a declaration
+    // does not introduce a binding into the function's environment record).
+    var enablesStrictMode = f["(isStrict)"] && !state.isStrict();
+    if (nameToken && (f["(name)"] === "arguments" || f["(name)"] === "eval") &&
+      enablesStrictMode) {
+      error("E008", nameToken);
+    }
+
+    if (state.tokens.next.id === "(" && state.tokens.next.line === state.tokens.curr.line) {
+      /* istanbul ignore next */
+      error("E039");
+    }
+    return this;
+  }).declaration = true;
+
+  prefix("function", function(context) {
+    var generator = false;
+    var isAsync = context & prodParams.preAsync;
+
+    if (state.tokens.next.value === "*") {
+      if (isAsync && !state.inES9()) {
+        warning("W119", state.tokens.prev, "async generators", "9");
+      } else if (!isAsync && !state.inES6(true)) {
+        warning("W119", state.tokens.curr, "function*", "6");
+      }
+
+      advance("*");
+      generator = true;
+    }
+
+    // This context modification restricts the use of `await` as the optional
+    // BindingIdentifier in async function expressions.
+    var nameToken = optionalidentifier(isAsync ? context | prodParams.async : context) ?
+      state.tokens.curr : null;
+
+    var f = doFunction(context, {
+      name: nameToken && nameToken.value,
+      type: generator ? "generator" : null
+    });
+
+    if (generator && nameToken && nameToken.value === "yield") {
+      error("E024", nameToken, "yield");
+    }
+
+    if (nameToken && (f["(name)"] === "arguments" || f["(name)"] === "eval") &&
+      f["(isStrict)"]) {
+      error("E008", nameToken);
+    }
+
+    return this;
+  });
+
+  blockstmt("if", function(context) {
+    var t = state.tokens.next;
+    increaseComplexityCount();
+    advance("(");
+    var expr = expression(context, 0);
+
+    if (!expr) {
+      quit("E041", this);
+    }
+
+    checkCondAssignment(expr);
+
+    // When the if is within a for-in loop, check if the condition
+    // starts with a negation operator
+    var forinifcheck = null;
+    if (state.option.forin && state.forinifcheckneeded) {
+      state.forinifcheckneeded = false; // We only need to analyze the first if inside the loop
+      forinifcheck = state.forinifchecks[state.forinifchecks.length - 1];
+      if (expr.type === "(punctuator)" && expr.value === "!") {
+        forinifcheck.type = "(negative)";
+      } else {
+        forinifcheck.type = "(positive)";
+      }
+    }
+
+    advance(")", t);
+    var s = block(context, true, true);
+
+    // When the if is within a for-in loop and the condition has a negative form,
+    // check if the body contains nothing but a continue statement
+    if (forinifcheck && forinifcheck.type === "(negative)") {
+      if (s && s[0] && s[0].type === "(identifier)" && s[0].value === "continue") {
+        forinifcheck.type = "(negative-with-continue)";
+      }
+    }
+
+    if (state.tokens.next.id === "else") {
+      advance("else");
+      if (state.tokens.next.id === "if" || state.tokens.next.id === "switch") {
+        statement(context);
+      } else {
+        block(context, true, true);
+      }
+    }
+    return this;
+  });
+
+  blockstmt("try", function(context) {
+    var b;
+    var hasParameter = false;
+
+    function catchParameter() {
+      advance("(");
+
+      if (checkPunctuators(state.tokens.next, ["[", "{"])) {
+        var tokens = destructuringPattern(context);
+        _.each(tokens, function(token) {
+          if (token.id) {
+            state.funct["(scope)"].addParam(token.id, token, "exception");
+          }
+        });
+      } else if (state.tokens.next.type !== "(identifier)") {
+        warning("E030", state.tokens.next, state.tokens.next.value);
+      } else {
+        // only advance if an identifier is present. This allows JSHint to
+        // recover from the case where no value is specified.
+        state.funct["(scope)"].addParam(identifier(context), state.tokens.curr, "exception");
+      }
+
+      if (state.tokens.next.value === "if") {
+        if (!state.inMoz()) {
+          warning("W118", state.tokens.curr, "catch filter");
+        }
+        advance("if");
+        expression(context, 0);
+      }
+
+      advance(")");
+    }
+
+    block(context | prodParams.tryClause, true);
+
+    while (state.tokens.next.id === "catch") {
+      increaseComplexityCount();
+      if (b && (!state.inMoz())) {
+        warning("W118", state.tokens.next, "multiple catch blocks");
+      }
+      advance("catch");
+      if (state.tokens.next.id !== "{") {
+        state.funct["(scope)"].stack("catchparams");
+        hasParameter = true;
+        catchParameter();
+      } else if (!state.inES10()) {
+        warning("W119", state.tokens.curr, "optional catch binding", "10");
+      }
+      block(context, false);
+
+      if (hasParameter) {
+        state.funct["(scope)"].unstack();
+        hasParameter = false;
+      }
+      b = true;
+    }
+
+    if (state.tokens.next.id === "finally") {
+      advance("finally");
+      block(context, true);
+      return;
+    }
+
+    if (!b) {
+      error("E021", state.tokens.next, "catch", state.tokens.next.value);
+    }
+
+    return this;
+  });
+
+  blockstmt("while", function(context) {
+    var t = state.tokens.next;
+    state.funct["(breakage)"] += 1;
+    state.funct["(loopage)"] += 1;
+    increaseComplexityCount();
+    advance("(");
+    checkCondAssignment(expression(context, 0));
+    advance(")", t);
+    block(context, true, true);
+    state.funct["(breakage)"] -= 1;
+    state.funct["(loopage)"] -= 1;
+    return this;
+  }).labelled = true;
+
+  blockstmt("with", function(context) {
+    var t = state.tokens.next;
+    if (state.isStrict()) {
+      error("E010", state.tokens.curr);
+    } else if (!state.option.withstmt) {
+      warning("W085", state.tokens.curr);
+    }
+
+    advance("(");
+    expression(context, 0);
+    advance(")", t);
+    block(context, true, true);
+
+    return this;
+  });
+
+  blockstmt("switch", function(context) {
+    var t = state.tokens.next;
+    var g = false;
+    var noindent = false;
+    var seenCase = false;
+
+    state.funct["(breakage)"] += 1;
+    advance("(");
+    checkCondAssignment(expression(context, 0));
+    advance(")", t);
+    t = state.tokens.next;
+    advance("{");
+    state.funct["(scope)"].stack();
+
+    if (state.tokens.next.from === indent)
+      noindent = true;
+
+    if (!noindent)
+      indent += state.option.indent;
+
+    for (;;) {
+      switch (state.tokens.next.id) {
+      case "case":
+        switch (state.funct["(verb)"]) {
+        case "yield":
+        case "break":
+        case "case":
+        case "continue":
+        case "return":
+        case "switch":
+        case "throw":
+          break;
+        case "default":
+          if (state.option.leanswitch) {
+            warning("W145", state.tokens.next);
+          }
+
+          break;
+        default:
+          // You can tell JSHint that you don't use break intentionally by
+          // adding a comment /* falls through */ on a line just before
+          // the next `case`.
+          if (!state.tokens.curr.caseFallsThrough) {
+            warning("W086", state.tokens.curr, "case");
+          }
+        }
+
+        advance("case");
+        expression(context, 0);
+        seenCase = true;
+        increaseComplexityCount();
+        g = true;
+        advance(":");
+        state.funct["(verb)"] = "case";
+        break;
+      case "default":
+        switch (state.funct["(verb)"]) {
+        case "yield":
+        case "break":
+        case "continue":
+        case "return":
+        case "throw":
+          break;
+        case "case":
+          if (state.option.leanswitch) {
+            warning("W145", state.tokens.curr);
+          }
+
+          break;
+        default:
+          // Do not display a warning if 'default' is the first statement or if
+          // there is a special /* falls through */ comment.
+          if (seenCase && !state.tokens.curr.caseFallsThrough) {
+            warning("W086", state.tokens.curr, "default");
+          }
+        }
+
+        advance("default");
+        g = true;
+        advance(":");
+        state.funct["(verb)"] = "default";
+        break;
+      case "}":
+        if (!noindent)
+          indent -= state.option.indent;
+
+        advance("}", t);
+        state.funct["(scope)"].unstack();
+        state.funct["(breakage)"] -= 1;
+        state.funct["(verb)"] = undefined;
+        return;
+      /* istanbul ignore next */
+      case "(end)":
+        error("E023", state.tokens.next, "}");
+        return;
+      default:
+        indent += state.option.indent;
+        if (g) {
+          switch (state.tokens.curr.id) {
+          /* istanbul ignore next */
+          case ",":
+            error("E040");
+            return;
+          case ":":
+            g = false;
+            statements(context);
+            break;
+          /* istanbul ignore next */
+          default:
+            error("E025", state.tokens.curr);
+            return;
+          }
+        } else {
+          /* istanbul ignore else */
+          if (state.tokens.curr.id === ":") {
+            advance(":");
+            error("E024", state.tokens.curr, ":");
+            statements(context);
+          } else {
+            error("E021", state.tokens.next, "case", state.tokens.next.value);
+            return;
+          }
+        }
+        indent -= state.option.indent;
+      }
+    }
+  }).labelled = true;
+
+  stmt("debugger", function() {
+    if (!state.option.debug) {
+      warning("W087", this);
+    }
+    return this;
+  }).exps = true;
+
+  (function() {
+    var x = stmt("do", function(context) {
+      state.funct["(breakage)"] += 1;
+      state.funct["(loopage)"] += 1;
+      increaseComplexityCount();
+
+      this.first = block(context, true, true);
+      advance("while");
+      var t = state.tokens.next;
+      advance("(");
+      checkCondAssignment(expression(context, 0));
+      advance(")", t);
+      state.funct["(breakage)"] -= 1;
+      state.funct["(loopage)"] -= 1;
+      return this;
+    });
+    x.labelled = true;
+    x.exps = true;
+  }());
+
+  blockstmt("for", function(context) {
+    var s, t = state.tokens.next;
+    var letscope = false;
+    var isAsync = false;
+    var foreachtok = null;
+
+    if (t.value === "each") {
+      foreachtok = t;
+      advance("each");
+      if (!state.inMoz()) {
+        warning("W118", state.tokens.curr, "for each");
+      }
+    }
+
+    if (state.tokens.next.identifier && state.tokens.next.value === "await") {
+      advance("await");
+      isAsync = true;
+
+      if (!(context & prodParams.async)) {
+        error("E024", state.tokens.curr, "await");
+      } else if (!state.inES9()) {
+        warning("W119", state.tokens.curr, "asynchronous iteration", "9");
+      }
+    }
+
+    increaseComplexityCount();
+    advance("(");
+
+    // what kind of for(…) statement it is? for(…of…)? for(…in…)? for(…;…;…)?
+    var nextop; // contains the token of the "in" or "of" operator
+    var comma; // First comma punctuator at level 0
+    var initializer; // First initializer at level 0
+    var bindingPower;
+    var targets;
+    var target;
+    var decl;
+    var afterNext = peek();
+
+    var headContext = context | prodParams.noin;
+
+    if (state.tokens.next.id === "var") {
+      advance("var");
+      decl = state.tokens.curr.fud(headContext);
+      comma = decl.hasComma ? decl : null;
+      initializer = decl.hasInitializer ? decl : null;
+    } else if (state.tokens.next.id === "const" ||
+      // The "let" keyword only signals a lexical binding if it is followed by
+      // an identifier, `{`, or `[`. Otherwise, it should be parsed as an
+      // IdentifierReference (i.e. in a subsquent branch).
+      (state.tokens.next.id === "let" &&
+        ((afterNext.identifier && afterNext.id !== "in") ||
+         checkPunctuators(afterNext, ["{", "["])))) {
+      advance(state.tokens.next.id);
+      // create a new block scope
+      letscope = true;
+      state.funct["(scope)"].stack();
+      decl = state.tokens.curr.fud(headContext);
+      comma = decl.hasComma ? decl : null;
+      initializer = decl.hasInitializer ? decl : null;
+    } else if (!checkPunctuator(state.tokens.next, ";")) {
+      targets = [];
+
+      while (state.tokens.next.value !== "in" &&
+        state.tokens.next.value !== "of" &&
+        !checkPunctuator(state.tokens.next, ";")) {
+
+        if (checkPunctuators(state.tokens.next, ["{", "["])) {
+          destructuringPattern(headContext, { assignment: true })
+            .forEach(function(elem) {
+              this.push(elem.token);
+            }, targets);
+          if (checkPunctuator(state.tokens.next, "=")) {
+            advance("=");
+            initializer = state.tokens.curr;
+            expression(headContext, 10);
+          }
+        } else {
+          target = expression(headContext, 10);
+
+          if (target) {
+            if (target.type === "(identifier)") {
+              targets.push(target);
+            } else if (checkPunctuator(target, "=")) {
+              initializer = target;
+              targets.push(target);
+            }
+          }
+        }
+
+        if (checkPunctuator(state.tokens.next, ",")) {
+          advance(",");
+
+          if (!comma) {
+            comma = state.tokens.curr;
+          }
+        }
+      }
+
+      //checkLeftSideAssign(target, nextop);
+
+      // In the event of a syntax error, do not issue warnings regarding the
+      // implicit creation of bindings.
+      if (!initializer && !comma) {
+        targets.forEach(function(token) {
+          if (!state.funct["(scope)"].has(token.value)) {
+            warning("W088", token, token.value);
+          }
+        });
+      }
+    }
+
+    nextop = state.tokens.next;
+
+    if (isAsync && nextop.value !== "of") {
+      error("E066", nextop);
+    }
+
+    // if we're in a for (… in|of …) statement
+    if (_.includes(["in", "of"], nextop.value)) {
+      if (nextop.value === "of") {
+        bindingPower = 20;
+
+        if (!state.inES6()) {
+          warning("W104", nextop, "for of", "6");
+        }
+      } else {
+        bindingPower = 0;
+      }
+      if (comma) {
+        error("W133", comma, nextop.value, "more than one ForBinding");
+      }
+      if (initializer) {
+        error("W133", initializer, nextop.value, "initializer is forbidden");
+      }
+      if (target && !comma && !initializer) {
+        checkLeftSideAssign(context, target, nextop);
+      }
+
+      advance(nextop.value);
+
+      // The binding power is variable because for-in statements accept any
+      // Expression in this position, while for-of statements are limited to
+      // AssignmentExpressions. For example:
+      //
+      //     for ( LeftHandSideExpression in Expression ) Statement
+      //     for ( LeftHandSideExpression of AssignmentExpression ) Statement
+      expression(context, bindingPower);
+      advance(")", t);
+
+      if (nextop.value === "in" && state.option.forin) {
+        state.forinifcheckneeded = true;
+
+        if (state.forinifchecks === undefined) {
+          state.forinifchecks = [];
+        }
+
+        // Push a new for-in-if check onto the stack. The type will be modified
+        // when the loop's body is parsed and a suitable if statement exists.
+        state.forinifchecks.push({
+          type: "(none)"
+        });
+      }
+
+      state.funct["(breakage)"] += 1;
+      state.funct["(loopage)"] += 1;
+
+      s = block(context, true, true);
+
+      if (nextop.value === "in" && state.option.forin) {
+        if (state.forinifchecks && state.forinifchecks.length > 0) {
+          var check = state.forinifchecks.pop();
+
+          if (// No if statement or not the first statement in loop body
+              s && s.length > 0 && (typeof s[0] !== "object" || s[0].value !== "if") ||
+              // Positive if statement is not the only one in loop body
+              check.type === "(positive)" && s.length > 1 ||
+              // Negative if statement but no continue
+              check.type === "(negative)") {
+            warning("W089", this);
+          }
+        }
+
+        // Reset the flag in case no if statement was contained in the loop body
+        state.forinifcheckneeded = false;
+      }
+
+      state.funct["(breakage)"] -= 1;
+      state.funct["(loopage)"] -= 1;
+
+    } else {
+      if (foreachtok) {
+        error("E045", foreachtok);
+      }
+
+      advance(";");
+      if (decl && decl.first && decl.first[0]) {
+        if (decl.value === "const"  && !decl.hasInitializer) {
+          warning("E012", decl, decl.first[0].value);
+        }
+
+        decl.first.forEach(function(token) {
+          state.funct["(scope)"].initialize(token.value);
+        });
+      }
+
+      // start loopage after the first ; as the next two expressions are executed
+      // on every loop
+      state.funct["(loopage)"] += 1;
+      if (state.tokens.next.id !== ";") {
+        checkCondAssignment(expression(context, 0));
+      }
+
+      advance(";");
+      if (state.tokens.next.id === ";") {
+        error("E021", state.tokens.next, ")", ";");
+      }
+      if (state.tokens.next.id !== ")") {
+        for (;;) {
+          expression(context, 0);
+          if (state.tokens.next.id !== ",") {
+            break;
+          }
+          advance(",");
+          checkComma();
+        }
+      }
+      advance(")", t);
+      state.funct["(breakage)"] += 1;
+      block(context, true, true);
+      state.funct["(breakage)"] -= 1;
+      state.funct["(loopage)"] -= 1;
+    }
+
+    // unstack loop blockscope
+    if (letscope) {
+      state.funct["(scope)"].unstack();
+    }
+    return this;
+  }).labelled = true;
+
+
+  stmt("break", function() {
+    var v = state.tokens.next.value;
+
+    if (state.tokens.next.identifier &&
+        sameLine(state.tokens.curr, state.tokens.next)) {
+      if (!state.funct["(scope)"].funct.hasLabel(v)) {
+        warning("W090", state.tokens.next, v);
+      }
+      this.first = state.tokens.next;
+      advance();
+    } else {
+      if (state.funct["(breakage)"] === 0)
+        warning("W052", state.tokens.next, this.value);
+    }
+
+    reachable(this);
+
+    return this;
+  }).exps = true;
+
+
+  stmt("continue", function() {
+    var v = state.tokens.next.value;
+
+    if (state.funct["(breakage)"] === 0 || !state.funct["(loopage)"]) {
+      warning("W052", state.tokens.next, this.value);
+    }
+
+    if (state.tokens.next.identifier) {
+      if (sameLine(state.tokens.curr, state.tokens.next)) {
+        if (!state.funct["(scope)"].funct.hasLabel(v)) {
+          warning("W090", state.tokens.next, v);
+        }
+        this.first = state.tokens.next;
+        advance();
+      }
+    }
+
+    reachable(this);
+
+    return this;
+  }).exps = true;
+
+
+  stmt("return", function(context) {
+    if (sameLine(this, state.tokens.next)) {
+      if (state.tokens.next.id !== ";" && !state.tokens.next.reach) {
+        this.first = expression(context, 0);
+
+        if (this.first &&
+            this.first.type === "(punctuator)" && this.first.value === "=" &&
+            !this.first.paren && !state.option.boss) {
+          warning("W093", this.first);
+        }
+
+        if (state.option.noreturnawait && context & prodParams.async &&
+            !(context & prodParams.tryClause) &&
+            this.first.identifier && this.first.value === "await") {
+          warning("W146", this.first);
+        }
+      }
+    } else {
+      if (state.tokens.next.type === "(punctuator)" &&
+        ["[", "{", "+", "-"].indexOf(state.tokens.next.value) > -1) {
+        nolinebreak(this); // always warn (Line breaking error)
+      }
+    }
+
+    reachable(this);
+
+    return this;
+  }).exps = true;
+
+  prefix("await", function(context) {
+    if (context & prodParams.async) {
+      // If the parameters of the current function scope have not been defined,
+      // it is because the current expression is contained within the parameter
+      // list.
+      if (!state.funct["(params)"]) {
+        error("E024", this, "await");
+      }
+
+      expression(context, 10);
+      return this;
+    } else {
+      this.exps = false;
+      return state.syntax["(identifier)"].nud.apply(this, arguments);
+    }
+  }).exps = true;
+
+  (function(asyncSymbol) {
+    asyncSymbol.meta = { es5: true, isFutureReservedWord: true, strictOnly: true };
+    asyncSymbol.isFunc = function() {
+      var next = state.tokens.next;
+      var afterParens;
+
+      if (this.line !== next.line) {
+        return false;
+      }
+
+      if (next.id === "function") {
+        return true;
+      }
+
+      if (next.id === "(") {
+        afterParens = peekThroughParens(0);
+
+        return afterParens.id === "=>";
+      }
+
+      if (next.identifier) {
+        return peek().id === "=>";
+      }
+
+      return false;
+    };
+    asyncSymbol.useFud = asyncSymbol.isFunc;
+    // async function declaration
+    asyncSymbol.fud = function(context) {
+      if (!state.inES8()) {
+        warning("W119", this, "async functions", "8");
+      }
+      context |= prodParams.preAsync;
+      context |= prodParams.initial;
+      this.func = expression(context, 0);
+      this.block = this.func.block;
+      this.exps = this.func.exps;
+      return this;
+    };
+    asyncSymbol.exps = true;
+    delete asyncSymbol.reserved;
+  }(prefix("async", function(context, rbp) {
+    if (this.isFunc(context)) {
+      if (!state.inES8()) {
+        warning("W119", this, "async functions", "8");
+      }
+
+      context |= prodParams.preAsync;
+      this.func = expression(context, rbp);
+      this.identifier = false;
+      return this;
+    }
+
+    this.exps = false;
+    return state.syntax["(identifier)"].nud.apply(this, arguments);
+  })));
+
+  (function(yieldSymbol) {
+    yieldSymbol.rbp = yieldSymbol.lbp = 25;
+    yieldSymbol.exps = true;
+  })(prefix("yield", function(context) {
+    if (state.inMoz()) {
+      return mozYield.call(this, context);
+    }
+
+    if (!(context & prodParams.yield)) {
+      this.exps = false;
+      return state.syntax["(identifier)"].nud.apply(this, arguments);
+    }
+
+    var prev = state.tokens.prev;
+
+    // If the parameters of the current function scope have not been defined,
+    // it is because the current expression is contained within the parameter
+    // list.
+    if (!state.funct["(params)"]) {
+      error("E024", this, "yield");
+    }
+
+    if (!this.beginsStmt && prev.lbp > 30 && !checkPunctuators(prev, ["("])) {
+      error("E061", this);
+    }
+
+    if (!state.inES6()) {
+      warning("W104", state.tokens.curr, "yield", "6");
+    }
+    state.funct["(yielded)"] = true;
+
+    if (state.tokens.next.value === "*") {
+      advance("*");
+    }
+
+    // Parse operand
+    if (state.tokens.curr.value === "*" || sameLine(state.tokens.curr, state.tokens.next)) {
+      if (state.tokens.next.nud) {
+
+        nobreaknonadjacent(state.tokens.curr, state.tokens.next);
+        this.first = expression(context, 10);
+
+        if (this.first.type === "(punctuator)" && this.first.value === "=" &&
+            !this.first.paren && !state.option.boss) {
+          warning("W093", this.first);
+        }
+      } else if (state.tokens.next.led) {
+        if (state.tokens.next.id !== ",") {
+          error("W017", state.tokens.next);
+        }
+      }
+    }
+
+    return this;
+  }));
+
+  /**
+   * Parsing logic for non-standard Mozilla implementation of `yield`
+   * expressions.
+   */
+  var mozYield = function(context) {
+    var prev = state.tokens.prev;
+    if (state.inES6(true) && !(context & prodParams.yield)) {
+      error("E046", state.tokens.curr, "yield");
+    }
+    state.funct["(yielded)"] = true;
+    var delegatingYield = false;
+
+    if (state.tokens.next.value === "*") {
+      delegatingYield = true;
+      advance("*");
+    }
+
+    if (sameLine(this, state.tokens.next)) {
+      if (delegatingYield ||
+          (state.tokens.next.id !== ";" && !state.option.asi &&
+           !state.tokens.next.reach && state.tokens.next.nud)) {
+
+        nobreaknonadjacent(state.tokens.curr, state.tokens.next);
+        this.first = expression(context, 10);
+
+        if (this.first.type === "(punctuator)" && this.first.value === "=" &&
+            !this.first.paren && !state.option.boss) {
+          warning("W093", this.first);
+        }
+      }
+      if (state.tokens.next.id !== ")" &&
+          (prev.lbp > 30 || (!prev.assign && !isEndOfExpr()))) {
+        error("E050", this);
+      }
+    } else if (!state.option.asi) {
+      nolinebreak(this); // always warn (Line breaking error)
+    }
+    return this;
+  };
+
+  stmt("throw", function(context) {
+    nolinebreak(this);
+    this.first = expression(context, 20);
+
+    reachable(this);
+
+    return this;
+  }).exps = true;
+
+  stmt("import", function(context) {
+    if (!state.funct["(scope)"].block.isGlobal()) {
+      error("E053", state.tokens.curr, "Import");
+    }
+
+    if (!state.inES6()) {
+      warning("W119", state.tokens.curr, "import", "6");
+    }
+
+    if (state.tokens.next.type === "(string)") {
+      // ModuleSpecifier :: StringLiteral
+      advance("(string)");
+      return this;
+    }
+
+    if (state.tokens.next.identifier) {
+      // ImportClause :: ImportedDefaultBinding
+      this.name = identifier(context);
+      // Import bindings are immutable (see ES6 8.1.1.5.5)
+      state.funct["(scope)"].addbinding(this.name, {
+        type: "import",
+        initialized: true,
+        token: state.tokens.curr });
+
+      if (state.tokens.next.value === ",") {
+        // ImportClause :: ImportedDefaultBinding , NameSpaceImport
+        // ImportClause :: ImportedDefaultBinding , NamedImports
+        advance(",");
+        // At this point, we intentionally fall through to continue matching
+        // either NameSpaceImport or NamedImports.
+        // Discussion:
+        // https://github.com/jshint/jshint/pull/2144#discussion_r23978406
+      } else {
+        advance("from");
+        advance("(string)");
+        return this;
+      }
+    }
+
+    if (state.tokens.next.id === "*") {
+      // ImportClause :: NameSpaceImport
+      advance("*");
+      advance("as");
+      if (state.tokens.next.identifier) {
+        this.name = identifier(context);
+        // Import bindings are immutable (see ES6 8.1.1.5.5)
+        state.funct["(scope)"].addbinding(this.name, {
+          type: "import",
+          initialized: true,
+          token: state.tokens.curr });
+      }
+    } else {
+      // ImportClause :: NamedImports
+      advance("{");
+      for (;;) {
+        if (state.tokens.next.value === "}") {
+          advance("}");
+          break;
+        }
+        var importName;
+        if (state.tokens.next.type === "default") {
+          importName = "default";
+          advance("default");
+        } else {
+          importName = identifier(context);
+        }
+        if (state.tokens.next.value === "as") {
+          advance("as");
+          importName = identifier(context);
+        }
+
+        // Import bindings are immutable (see ES6 8.1.1.5.5)
+        state.funct["(scope)"].addbinding(importName, {
+          type: "import",
+          initialized: true,
+          token: state.tokens.curr });
+
+        if (state.tokens.next.value === ",") {
+          advance(",");
+        } else if (state.tokens.next.value === "}") {
+          advance("}");
+          break;
+        } else {
+          error("E024", state.tokens.next, state.tokens.next.value);
+          break;
+        }
+      }
+    }
+
+    // FromClause
+    advance("from");
+    advance("(string)");
+
+    // Support for ES2015 modules was released without warning for `import`
+    // declarations that lack bindings. Issuing a warning would therefor
+    // constitute a breaking change.
+    // TODO: enable this warning in JSHint 3
+    // if (hasBindings) {
+    //   warning("W142", this, "import", moduleSpecifier);
+    // }
+
+    return this;
+  }).exps = true;
+
+  stmt("export", function(context) {
+    var ok = true;
+    var token;
+    var identifier;
+    var moduleSpecifier;
+    context = context | prodParams.export;
+
+    if (!state.inES6()) {
+      warning("W119", state.tokens.curr, "export", "6");
+      ok = false;
+    }
+
+    if (!state.funct["(scope)"].block.isGlobal()) {
+      error("E053", state.tokens.curr, "Export");
+      ok = false;
+    }
+
+    if (state.tokens.next.value === "*") {
+      // ExportDeclaration :: export * FromClause
+      advance("*");
+      advance("from");
+      advance("(string)");
+      return this;
+    }
+
+    if (state.tokens.next.type === "default") {
+      // ExportDeclaration ::
+      //      export default [lookahead ∉ { function, class }] AssignmentExpression[In] ;
+      //      export default HoistableDeclaration
+      //      export default ClassDeclaration
+
+      // because the 'name' of a default-exported function is, confusingly, 'default'
+      // see https://bocoup.com/blog/whats-in-a-function-name
+      state.nameStack.set(state.tokens.next);
+
+      advance("default");
+      var exportType = state.tokens.next.id;
+      if (exportType === "function") {
+        this.block = true;
+        advance("function");
+        state.syntax["function"].fud(context);
+      } else if (exportType === "async" && peek().id === "function") {
+        this.block = true;
+        advance("async");
+        advance("function");
+        state.syntax["function"].fud(context | prodParams.preAsync);
+      } else if (exportType === "class") {
+        this.block = true;
+        advance("class");
+        state.syntax["class"].fud(context);
+      } else {
+        token = expression(context, 10);
+        if (token.identifier) {
+          identifier = token.value;
+          state.funct["(scope)"].setExported(identifier, token);
+        }
+      }
+      return this;
+    }
+    if (state.tokens.next.value === "{") {
+      // ExportDeclaration :: export ExportClause
+      advance("{");
+      var exportedTokens = [];
+      while (!checkPunctuator(state.tokens.next, "}")) {
+        if (!state.tokens.next.identifier) {
+          /* istanbul ignore next */
+          error("E030", state.tokens.next, state.tokens.next.value);
+        }
+        advance();
+
+        exportedTokens.push(state.tokens.curr);
+
+        if (state.tokens.next.value === "as") {
+          advance("as");
+          if (!state.tokens.next.identifier) {
+            /* istanbul ignore next */
+            error("E030", state.tokens.next, state.tokens.next.value);
+          }
+          advance();
+        }
+
+        if (!checkPunctuator(state.tokens.next, "}")) {
+          advance(",");
+        }
+      }
+      advance("}");
+      if (state.tokens.next.value === "from") {
+        // ExportDeclaration :: export ExportClause FromClause
+        advance("from");
+        moduleSpecifier = state.tokens.next;
+        advance("(string)");
+      } else if (ok) {
+        exportedTokens.forEach(function(token) {
+          state.funct["(scope)"].setExported(token.value, token);
+        });
+      }
+
+      if (exportedTokens.length === 0) {
+        if (moduleSpecifier) {
+          warning("W142", this, "export", moduleSpecifier.value);
+        } else {
+          warning("W141", this, "export");
+        }
+      }
+
+      return this;
+    } else if (state.tokens.next.id === "var") {
+      // ExportDeclaration :: export VariableStatement
+      advance("var");
+      state.tokens.curr.fud(context);
+    } else if (state.tokens.next.id === "let") {
+      // ExportDeclaration :: export VariableStatement
+      advance("let");
+      state.tokens.curr.fud(context);
+    } else if (state.tokens.next.id === "const") {
+      // ExportDeclaration :: export VariableStatement
+      advance("const");
+      state.tokens.curr.fud(context);
+    } else if (state.tokens.next.id === "function") {
+      // ExportDeclaration :: export Declaration
+      this.block = true;
+      advance("function");
+      state.syntax["function"].fud(context);
+    } else if (state.tokens.next.id === "async" && peek().id === "function") {
+      // ExportDeclaration :: export Declaration
+      this.block = true;
+      advance("async");
+      advance("function");
+      state.syntax["function"].fud(context | prodParams.preAsync);
+    } else if (state.tokens.next.id === "class") {
+      // ExportDeclaration :: export Declaration
+      this.block = true;
+      advance("class");
+      state.syntax["class"].fud(context);
+    } else {
+      /* istanbul ignore next */
+      error("E024", state.tokens.next, state.tokens.next.value);
+    }
+
+    return this;
+  }).exps = true;
+
+  /**
+   * Determine if SuperCall or SuperProperty may be used in the current context
+   * (as described by the provided "functor" object).
+   *
+   * @param {string} type - one of "property" or "call"
+   * @param {object} funct - a "functor" object describing the current function
+   *                         context
+   *
+   * @returns {boolean}
+   */
+  function supportsSuper(type, funct) {
+    if (type === "call" && funct["(async)"]) {
+      return false;
+    }
+
+    if (type === "property" && funct["(method)"]) {
+      return true;
+    }
+
+    if (type === "call" && funct["(statement)"] &&
+      funct["(statement)"].id === "class") {
+      return true;
+    }
+
+    if (funct["(arrow)"]) {
+      return supportsSuper(type, funct["(context)"]);
+    }
+
+    return false;
+  }
+
+  var superNud = function() {
+    var next = state.tokens.next;
+
+    if (checkPunctuators(next, ["[", "."])) {
+      if (!supportsSuper("property", state.funct)) {
+        error("E063", this);
+      }
+    } else if (checkPunctuator(next, "(")) {
+      if (!supportsSuper("call", state.funct)) {
+        error("E064", this);
+      }
+    } else {
+      error("E024", next, next.value || next.id);
+    }
+
+    return this;
+  };
+
+  // Future Reserved Words
+
+  FutureReservedWord("abstract");
+  FutureReservedWord("boolean");
+  FutureReservedWord("byte");
+  FutureReservedWord("char");
+  FutureReservedWord("double");
+  FutureReservedWord("enum", { es5: true });
+  FutureReservedWord("export", { es5: true });
+  FutureReservedWord("extends", { es5: true });
+  FutureReservedWord("final");
+  FutureReservedWord("float");
+  FutureReservedWord("goto");
+  FutureReservedWord("implements", { es5: true, strictOnly: true });
+  FutureReservedWord("import", { es5: true });
+  FutureReservedWord("int");
+  FutureReservedWord("interface", { es5: true, strictOnly: true });
+  FutureReservedWord("long");
+  FutureReservedWord("native");
+  FutureReservedWord("package", { es5: true, strictOnly: true });
+  FutureReservedWord("private", { es5: true, strictOnly: true });
+  FutureReservedWord("protected", { es5: true, strictOnly: true });
+  FutureReservedWord("public", { es5: true, strictOnly: true });
+  FutureReservedWord("short");
+  FutureReservedWord("static", { es5: true, strictOnly: true });
+  FutureReservedWord("synchronized");
+  FutureReservedWord("transient");
+  FutureReservedWord("volatile");
+
+  // this function is used to determine whether a squarebracket or a curlybracket
+  // expression is a comprehension array, destructuring assignment or a json value.
+
+  var lookupBlockType = function() {
+    var pn, pn1, prev;
+    var i = -1;
+    var bracketStack = 0;
+    var ret = {};
+    if (checkPunctuators(state.tokens.curr, ["[", "{"])) {
+      bracketStack += 1;
+    }
+    do {
+      prev = i === -1 ? state.tokens.curr : pn;
+      pn = i === -1 ? state.tokens.next : peek(i);
+      pn1 = peek(i + 1);
+      i = i + 1;
+      if (checkPunctuators(pn, ["[", "{"])) {
+        bracketStack += 1;
+      } else if (checkPunctuators(pn, ["]", "}"])) {
+        bracketStack -= 1;
+      }
+      if (bracketStack === 1 && pn.identifier && pn.value === "for" &&
+          !checkPunctuator(prev, ".")) {
+        ret.isCompArray = true;
+        ret.notJson = true;
+        break;
+      }
+      if (bracketStack === 0 && checkPunctuators(pn, ["}", "]"])) {
+        if (pn1.value === "=") {
+          ret.isDestAssign = true;
+          ret.notJson = true;
+          break;
+        } else if (pn1.value === ".") {
+          ret.notJson = true;
+          break;
+        }
+      }
+      if (checkPunctuator(pn, ";")) {
+        ret.notJson = true;
+      }
+    } while (bracketStack > 0 && pn.id !== "(end)");
+    return ret;
+  };
+
+  /**
+   * Update an object used to track property names within object initializers
+   * and class bodies. Produce warnings in response to duplicated names.
+   *
+   * @param {object} props - a collection of all properties of the object or
+   *                         class to which the current property is being
+   *                         assigned
+   * @param {string} name - the property name
+   * @param {object} tkn - the token defining the property
+   * @param {boolean} [isClass] - whether the accessor is part of an ES6 Class
+   *                              definition
+   * @param {boolean} [isStatic] - whether the accessor is a static method
+   * @param {boolean} [isComputed] - whether the property is a computed expression like [Symbol.iterator]
+   */
+  function saveProperty(props, name, tkn, isClass, isStatic, isComputed) {
+    if (tkn.identifier) {
+      name = tkn.value;
+    }
+    var key = name;
+    if (isClass && isStatic) {
+      key = "static " + name;
+    }
+
+    if (props[key] && name !== "__proto__" && !isComputed) {
+      var msg = ["key", "class method", "static class method"];
+      msg = msg[(isClass || false) + (isStatic || false)];
+      warning("W075", state.tokens.next, msg, name);
+    } else {
+      props[key] = Object.create(null);
+    }
+
+    props[key].basic = true;
+    props[key].basictkn = tkn;
+  }
+
+  /**
+   * Update an object used to track property names within object initializers
+   * and class bodies. Produce warnings in response to duplicated names.
+   *
+   * @param {string} accessorType - Either "get" or "set"
+   * @param {object} props - a collection of all properties of the object or
+   *                         class to which the current accessor is being
+   *                         assigned
+   * @param {object} tkn - the identifier token representing the accessor name
+   * @param {boolean} [isClass] - whether the accessor is part of an ES6 Class
+   *                              definition
+   * @param {boolean} [isStatic] - whether the accessor is a static method
+   */
+  function saveAccessor(accessorType, props, name, tkn, isClass, isStatic) {
+    var flagName = accessorType === "get" ? "getterToken" : "setterToken";
+    var key = name;
+    state.tokens.curr.accessorType = accessorType;
+    state.nameStack.set(tkn);
+    if (isClass && isStatic) {
+      key = "static " + name;
+    }
+
+    if (props[key]) {
+      if ((props[key].basic || props[key][flagName]) && name !== "__proto__") {
+        var msg = "";
+        if (isClass) {
+          if (isStatic) {
+            msg += "static ";
+          }
+          msg += accessorType + "ter method";
+        } else {
+          msg = "key";
+        }
+        warning("W075", state.tokens.next, msg, name);
+      }
+    } else {
+      props[key] = Object.create(null);
+    }
+
+    props[key][flagName] = tkn;
+    if (isStatic) {
+      props[key].static = true;
+    }
+  }
+
+  /**
+   * Parse a computed property name within object initializers and class bodies
+   * as introduced by ES2015. For example:
+   *
+   *     void {
+   *       [object.method()]: null
+   *     };
+   *
+   * @param {number} context - the parsing context
+   *
+   * @returns {object} - the token value that describes the expression which
+   *                     defines the property name
+   */
+  function computedPropertyName(context) {
+    advance("[");
+
+    // Explicitly reclassify token as a delimeter to prevent its later
+    // interpretation as an "infix" operator.
+    state.tokens.curr.delim = true;
+    state.tokens.curr.lbp = 0;
+
+    if (!state.inES6()) {
+      warning("W119", state.tokens.curr, "computed property names", "6");
+    }
+    var value = expression(context & ~prodParams.noin, 10);
+    advance("]");
+    return value;
+  }
+
+  /**
+   * Test whether a given token is a punctuator whose `value` property matches
+   * one of the specified values. This function explicitly verifies the token's
+   * `type` property so that like-valued string literals (e.g. `";"`) do not
+   * produce false positives.
+   *
+   * @param {Token} token
+   * @param {Array.<string>} values
+   *
+   * @returns {boolean}
+   */
+  function checkPunctuators(token, values) {
+    if (token.type === "(punctuator)") {
+      return _.includes(values, token.value);
+    }
+    return false;
+  }
+
+  /**
+   * Test whether a given token is a punctuator whose `value` property matches
+   * the specified value. This function explicitly verifies the token's `type`
+   * property so that like-valued string literals (e.g. `";"`) do not produce
+   * false positives.
+   *
+   * @param {Token} token
+   * @param {string} value
+   *
+   * @returns {boolean}
+   */
+  function checkPunctuator(token, value) {
+    return token.type === "(punctuator)" && token.value === value;
+  }
+
+  // Check whether this function has been reached for a destructuring assign with undeclared values
+  function destructuringAssignOrJsonValue(context) {
+    // lookup for the assignment (ECMAScript 6 only)
+    // if it has semicolons, it is a block, so go parse it as a block
+    // or it's not a block, but there are assignments, check for undeclared variables
+
+    var block = lookupBlockType();
+    if (block.notJson) {
+      if (!state.inES6() && block.isDestAssign) {
+        /* istanbul ignore next */
+        warning("W104", state.tokens.curr, "destructuring assignment", "6");
+      }
+      statements(context);
+    // otherwise parse json value
+    } else {
+      state.option.laxbreak = true;
+      state.jsonMode = true;
+      jsonValue();
+    }
+  }
+
+  /**
+   * Parse and define the three states of a list comprehension in order to
+   * avoid defining global variables, but keeping them to the list
+   * comprehension scope only. The order of the states are as follows:
+   *
+   * - "use" - which will be the returned iterative part of the list
+   *   comprehension
+   * - "define" - which will define the variables local to the list
+   *   comprehension
+   * - "filter" - which will help filter out values
+   */
+  var arrayComprehension = function() {
+    var CompArray = function() {
+      this.mode = "use";
+      this.variables = [];
+    };
+    var _carrays = [];
+    var _current;
+    function declare(v) {
+      var l = _current.variables.filter(function(elt) {
+        // if it has, change its undef state
+        if (elt.value === v) {
+          elt.undef = false;
+          return v;
+        }
+      }).length;
+      return l !== 0;
+    }
+    function use(v) {
+      var l = _current.variables.filter(function(elt) {
+        // and if it has been defined
+        if (elt.value === v && !elt.undef) {
+          if (elt.unused === true) {
+            elt.unused = false;
+          }
+          return v;
+        }
+      }).length;
+      // otherwise we warn about it
+      return (l === 0);
+    }
+    return { stack: function() {
+          _current = new CompArray();
+          _carrays.push(_current);
+        },
+        unstack: function() {
+          _current.variables.filter(function(v) {
+            if (v.unused)
+              warning("W098", v.token, v.token.raw_text || v.value);
+            if (v.undef)
+              state.funct["(scope)"].block.use(v.value, v.token);
+          });
+          _carrays.splice(-1, 1);
+          _current = _carrays[_carrays.length - 1];
+        },
+        setState: function(s) {
+          if (_.includes(["use", "define", "generate", "filter"], s))
+            _current.mode = s;
+        },
+        check: function(v) {
+          if (!_current) {
+            return;
+          }
+          // When we are in "use" state of the list comp, we enqueue that var
+          if (_current && _current.mode === "use") {
+            if (use(v)) {
+              _current.variables.push({
+                token: state.tokens.curr,
+                value: v,
+                undef: true,
+                unused: false
+              });
+            }
+            return true;
+          // When we are in "define" state of the list comp,
+          } else if (_current && _current.mode === "define") {
+            // check if the variable has been used previously
+            if (!declare(v)) {
+              _current.variables.push({
+                token: state.tokens.curr,
+                value: v,
+                undef: false,
+                unused: true
+              });
+            }
+            return true;
+          // When we are in the "generate" state of the list comp,
+          } else if (_current && _current.mode === "generate") {
+            state.funct["(scope)"].block.use(v, state.tokens.curr);
+            return true;
+          // When we are in "filter" state,
+          } else if (_current && _current.mode === "filter") {
+            // we check whether current variable has been declared
+            if (use(v)) {
+              // if not we warn about it
+              /* istanbul ignore next */
+              state.funct["(scope)"].block.use(v, state.tokens.curr);
+            }
+            return true;
+          }
+          /* istanbul ignore next */
+          return false;
+        }
+        };
+  };
+
+
+  /**
+   * Parse input according to the JSON format.
+   *
+   * http://json.org/
+   */
+  function jsonValue() {
+    function jsonObject() {
+      var o = {}, t = state.tokens.next;
+      advance("{");
+      if (state.tokens.next.id !== "}") {
+        for (;;) {
+          if (state.tokens.next.id === "(end)") {
+            error("E026", state.tokens.next, t.line);
+          } else if (state.tokens.next.id === "}") {
+            warning("W094", state.tokens.curr);
+            break;
+          } else if (state.tokens.next.id === ",") {
+            error("E028", state.tokens.next);
+          } else if (state.tokens.next.id !== "(string)") {
+            warning("W095", state.tokens.next, state.tokens.next.value);
+          }
+          if (o[state.tokens.next.value] === true) {
+            warning("W075", state.tokens.next, "key", state.tokens.next.value);
+          } else if ((state.tokens.next.value === "__proto__" &&
+            !state.option.proto) || (state.tokens.next.value === "__iterator__" &&
+            !state.option.iterator)) {
+            warning("W096", state.tokens.next, state.tokens.next.value);
+          } else {
+            o[state.tokens.next.value] = true;
+          }
+          advance();
+          advance(":");
+          jsonValue();
+          if (state.tokens.next.id !== ",") {
+            break;
+          }
+          advance(",");
+        }
+      }
+      advance("}");
+    }
+
+    function jsonArray() {
+      var t = state.tokens.next;
+      advance("[");
+      if (state.tokens.next.id !== "]") {
+        for (;;) {
+          if (state.tokens.next.id === "(end)") {
+            error("E027", state.tokens.next, t.line);
+          } else if (state.tokens.next.id === "]") {
+            warning("W094", state.tokens.curr);
+            break;
+          } else if (state.tokens.next.id === ",") {
+            error("E028", state.tokens.next);
+          }
+          jsonValue();
+          if (state.tokens.next.id !== ",") {
+            break;
+          }
+          advance(",");
+        }
+      }
+      advance("]");
+    }
+
+    switch (state.tokens.next.id) {
+    case "{":
+      jsonObject();
+      break;
+    case "[":
+      jsonArray();
+      break;
+    case "true":
+    case "false":
+    case "null":
+    case "(number)":
+    case "(string)":
+      advance();
+      break;
+    case "-":
+      advance("-");
+      advance("(number)");
+      break;
+    default:
+      error("E003", state.tokens.next);
+    }
+  }
+
+  /**
+   * Lint dynamically-evaluated code, appending any resulting errors/warnings
+   * into the global `errors` array.
+   *
+   * @param {array} internals - collection of "internals" objects describing
+   *                            string tokens that contain evaluated code
+   * @param {object} options - linting options to apply
+   * @param {object} globals - globally-defined bindings for the evaluated code
+   */
+  function lintEvalCode(internals, options, globals) {
+    var priorErrorCount, idx, jdx, internal;
+
+    for (idx = 0; idx < internals.length; idx += 1) {
+      internal = internals[idx];
+      options.scope = internal.elem;
+      priorErrorCount = JSHINT.errors.length;
+
+      itself(internal.code, options, globals);
+
+      for (jdx = priorErrorCount; jdx < JSHINT.errors.length; jdx += 1) {
+        JSHINT.errors[jdx].line += internal.token.line - 1;
+      }
+    }
+  }
+
+  var escapeRegex = function(str) {
+    return str.replace(/[-\/\\^$*+?.()|[\]{}]/g, "\\$&");
+  };
+
+  // The actual JSHINT function itself.
+  var itself = function(s, o, g) {
+    var x, reIgnoreStr, reIgnore;
+    var optionKeys, newOptionObj, newIgnoredObj;
+
+    o = _.clone(o);
+    state.reset();
+    newOptionObj = state.option;
+    newIgnoredObj = state.ignored;
+
+    if (o && o.scope) {
+      JSHINT.scope = o.scope;
+    } else {
+      JSHINT.errors = [];
+      JSHINT.internals = [];
+      JSHINT.blacklist = {};
+      JSHINT.scope = "(main)";
+    }
+
+    predefined = Object.create(null);
+    combine(predefined, vars.ecmaIdentifiers[3]);
+    combine(predefined, vars.reservedVars);
+
+    declared = Object.create(null);
+    var exported = Object.create(null); // Variables that live outside the current file
+
+    function each(obj, cb) {
+      if (!obj)
+        return;
+
+      if (!Array.isArray(obj) && typeof obj === "object")
+        obj = Object.keys(obj);
+
+      obj.forEach(cb);
+    }
+
+    if (o) {
+
+      each([o.predef, o.globals], function(dict) {
+        each(dict, function(item) {
+          var slice, prop;
+
+          if (item[0] === "-") {
+            slice = item.slice(1);
+            JSHINT.blacklist[slice] = slice;
+            // remove from predefined if there
+            delete predefined[slice];
+          } else {
+            prop = Object.getOwnPropertyDescriptor(dict, item);
+            predefined[item] = prop ? prop.value : false;
+          }
+        });
+      });
+
+      each(o.exported || null, function(item) {
+        exported[item] = true;
+      });
+
+      delete o.predef;
+      delete o.exported;
+
+      optionKeys = Object.keys(o);
+      for (x = 0; x < optionKeys.length; x++) {
+        if (/^-W\d{3}$/g.test(optionKeys[x])) {
+          newIgnoredObj[optionKeys[x].slice(1)] = true;
+        } else {
+          var optionKey = optionKeys[x];
+          newOptionObj[optionKey] = o[optionKey];
+        }
+      }
+    }
+
+    state.option = newOptionObj;
+    state.ignored = newIgnoredObj;
+
+    state.option.indent = state.option.indent || 4;
+    state.option.maxerr = state.option.maxerr || 50;
+
+    indent = 1;
+
+    var scopeManagerInst = scopeManager(state, predefined, exported, declared);
+    scopeManagerInst.on("warning", function(ev) {
+      warning.apply(null, [ ev.code, ev.token].concat(ev.data));
+    });
+
+    scopeManagerInst.on("error", function(ev) {
+      /* istanbul ignore next */
+      error.apply(null, [ ev.code, ev.token ].concat(ev.data));
+    });
+
+    state.funct = functor("(global)", null, {
+      "(global)"    : true,
+      "(scope)"     : scopeManagerInst,
+      "(comparray)" : arrayComprehension(),
+      "(metrics)"   : createMetrics(state.tokens.next)
+    });
+
+    functions = [state.funct];
+    member = {};
+    membersOnly = null;
+    inblock = false;
+    lookahead = [];
+
+    if (!isString(s) && !Array.isArray(s)) {
+      errorAt("E004", 0);
+      return false;
+    }
+
+    api = {
+      get isJSON() {
+        /* istanbul ignore next */
+        return state.jsonMode;
+      },
+
+      getOption: function(name) {
+        return state.option[name] || null;
+      },
+
+      getCache: function(name) {
+        return state.cache[name];
+      },
+
+      setCache: function(name, value) {
+        state.cache[name] = value;
+      },
+
+      warn: function(code, data) {
+        warningAt.apply(null, [ code, data.line, data.char ].concat(data.data));
+      },
+
+      on: function(names, listener) {
+        names.split(" ").forEach(function(name) {
+          emitter.on(name, listener);
+        }.bind(this));
+      }
+    };
+
+    emitter.removeAllListeners();
+    (extraModules || []).forEach(function(func) {
+      func(api);
+    });
+
+    state.tokens.prev = state.tokens.curr = state.tokens.next = state.syntax["(begin)"];
+    if (o && o.ignoreDelimiters) {
+
+      if (!Array.isArray(o.ignoreDelimiters)) {
+        /* istanbul ignore next */
+        o.ignoreDelimiters = [o.ignoreDelimiters];
+      }
+
+      o.ignoreDelimiters.forEach(function(delimiterPair) {
+        if (!delimiterPair.start || !delimiterPair.end)
+            return;
+
+        reIgnoreStr = escapeRegex(delimiterPair.start) +
+                      "[\\s\\S]*?" +
+                      escapeRegex(delimiterPair.end);
+
+        reIgnore = new RegExp(reIgnoreStr, "ig");
+
+        s = s.replace(reIgnore, function(match) {
+          return match.replace(/./g, " ");
+        });
+      });
+    }
+
+    lex = new Lexer(s);
+
+    lex.on("warning", function(ev) {
+      warningAt.apply(null, [ ev.code, ev.line, ev.character].concat(ev.data));
+    });
+
+    lex.on("error", function(ev) {
+      errorAt.apply(null, [ ev.code, ev.line, ev.character ].concat(ev.data));
+    });
+
+    lex.on("fatal", function(ev) {
+      quit("E041", ev);
+    });
+
+    lex.on("Identifier", function(ev) {
+      emitter.emit("Identifier", ev);
+    });
+
+    lex.on("String", function(ev) {
+      emitter.emit("String", ev);
+    });
+
+    lex.on("Number", function(ev) {
+      emitter.emit("Number", ev);
+    });
+
+    // Check options
+    var name;
+    for (name in o) {
+      if (_.has(o, name)) {
+        checkOption(name, true, state.tokens.curr);
+      }
+    }
+    if (o) {
+      for (name in o.unstable) {
+        if (_.has(o.unstable, name)) {
+          checkOption(name, false, state.tokens.curr);
+        }
+      }
+    }
+
+    try {
+      applyOptions();
+
+      // combine the passed globals after we've assumed all our options
+      combine(predefined, g || {});
+
+      //reset values
+      checkComma.first = true;
+
+      advance();
+      switch (state.tokens.next.id) {
+      case "{":
+      case "[":
+        destructuringAssignOrJsonValue(0);
+        break;
+      default:
+        directives();
+
+        if (state.directive["use strict"]) {
+          if (!state.allowsGlobalUsd()) {
+            warning("W097", state.tokens.prev);
+          }
+        }
+
+        statements(0);
+      }
+
+      if (state.tokens.next.id !== "(end)") {
+        quit("E041", state.tokens.curr);
+      }
+
+      state.funct["(scope)"].unstack();
+
+    } catch (err) {
+      if (err && err.name === "JSHintError") {
+        var nt = state.tokens.next || {};
+        JSHINT.errors.push({
+          scope     : "(main)",
+          raw       : err.raw,
+          code      : err.code,
+          reason    : err.reason,
+          line      : err.line || nt.line,
+          character : err.character || nt.from
+        });
+      } else {
+        /* istanbul ignore next */
+        throw err;
+      }
+    }
+
+    // Loop over the listed "internals", and check them as well.
+    if (JSHINT.scope === "(main)") {
+      lintEvalCode(JSHINT.internals, o || {}, g);
+    }
+
+    return JSHINT.errors.length === 0;
+  };
+
+  // Modules.
+  itself.addModule = function(func) {
+    extraModules.push(func);
+  };
+
+  itself.addModule(style.register);
+
+  // Data summary.
+  itself.data = function() {
+    var data = {
+      functions: [],
+      options: state.option
+    };
+
+    var fu, f, i, n, globals;
+
+    if (itself.errors.length) {
+      data.errors = itself.errors;
+    }
+
+    if (state.jsonMode) {
+      /* istanbul ignore next */
+      data.json = true;
+    }
+
+    var impliedGlobals = state.funct["(scope)"].getImpliedGlobals();
+    if (impliedGlobals.length > 0) {
+      data.implieds = impliedGlobals;
+    }
+
+    globals = state.funct["(scope)"].getUsedOrDefinedGlobals();
+    if (globals.length > 0) {
+      data.globals = globals;
+    }
+
+    for (i = 1; i < functions.length; i += 1) {
+      f = functions[i];
+      fu = {};
+
+      fu.name = f["(name)"];
+      fu.param = f["(params)"];
+      fu.line = f["(line)"];
+      fu.character = f["(character)"];
+      fu.last = f["(last)"];
+      fu.lastcharacter = f["(lastcharacter)"];
+
+      fu.metrics = {
+        complexity: f["(metrics)"].ComplexityCount,
+        parameters: f["(metrics)"].arity,
+        statements: f["(metrics)"].statementCount
+      };
+
+      data.functions.push(fu);
+    }
+
+    var unuseds = state.funct["(scope)"].getUnuseds();
+    if (unuseds.length > 0) {
+      data.unused = unuseds;
+    }
+
+    for (n in member) {
+      if (typeof member[n] === "number") {
+        data.member = member;
+        break;
+      }
+    }
+
+    return data;
+  };
+
+  itself.jshint = itself;
+
+  return itself;
+}());
+
+// Make JSHINT a Node module, if possible.
+if (typeof exports === "object" && exports) {
+  exports.JSHINT = JSHINT;
+}
+
+},{"./lex.js":17,"./messages.js":18,"./options.js":20,"./prod-params.js":21,"./reg.js":22,"./scope-manager.js":23,"./state.js":24,"./style.js":25,"./vars.js":26,"console-browserify":14,"events":9,"lodash":16}]},{},[]);
+
+JSHINT = require('jshint').JSHINT;
+if (typeof exports === 'object' && exports) exports.JSHINT = JSHINT;
+}());
\ No newline at end of file