lodash/test/utils.js

/** Used to detect when a function becomes hot. */
var HOT_COUNT = 150;

/** Used as the size to cover large array optimizations. */
var LARGE_ARRAY_SIZE = 200;

/** Used as the `TypeError` message for "Functions" methods. */
var FUNC_ERROR_TEXT = 'Expected a function';

/** Used as the maximum memoize cache size. */
var MAX_MEMOIZE_SIZE = 500;

/** Used as references for various `Number` constants. */
var MAX_SAFE_INTEGER = 9007199254740991,
    MAX_INTEGER = 1.7976931348623157e+308;

/** Used as references for the maximum length and index of an array. */
var MAX_ARRAY_LENGTH = 4294967295,
    MAX_ARRAY_INDEX = MAX_ARRAY_LENGTH - 1;

/** `Object#toString` result references. */
var funcTag = '[object Function]',
    numberTag = '[object Number]',
    objectTag = '[object Object]';

/** Used as a reference to the global object. */
var root = (typeof global == 'object' && global) || this;

/** Used to store lodash to test for bad extensions/shims. */
var lodashBizarro = root.lodashBizarro;

/** Used for native method references. */
var arrayProto = Array.prototype,
    funcProto = Function.prototype,
    objectProto = Object.prototype,
    numberProto = Number.prototype,
    stringProto = String.prototype;

/** Method and object shortcuts. */
var phantom = root.phantom,
    process = root.process,
    amd = root.define ? define.amd : undefined,
    args = toArgs([1, 2, 3]),
    argv = process ? process.argv : undefined,
    defineProperty = Object.defineProperty,
    document = phantom ? undefined : root.document,
    body = root.document ? root.document.body : undefined,
    create = Object.create,
    fnToString = funcProto.toString,
    freeze = Object.freeze,
    getSymbols = Object.getOwnPropertySymbols,
    identity = function(value) { return value; },
    noop = function() {},
    objToString = objectProto.toString,
    params = argv,
    push = arrayProto.push,
    realm = {},
    slice = arrayProto.slice,
    strictArgs = (function() { 'use strict'; return arguments; }(1, 2, 3));

var ArrayBuffer = root.ArrayBuffer,
    Buffer = root.Buffer,
    Map = root.Map,
    Promise = root.Promise,
    Proxy = root.Proxy,
    Set = root.Set,
    Symbol = root.Symbol,
    Uint8Array = root.Uint8Array,
    WeakMap = root.WeakMap,
    WeakSet = root.WeakSet;

var arrayBuffer = ArrayBuffer ? new ArrayBuffer(2) : undefined,
    map = Map ? new Map : undefined,
    promise = Promise ? Promise.resolve(1) : undefined,
    set = Set ? new Set : undefined,
    symbol = Symbol ? Symbol('a') : undefined,
    weakMap = WeakMap ? new WeakMap : undefined,
    weakSet = WeakSet ? new WeakSet : undefined;

/** Math helpers. */
var add = function(x, y) { return x + y; },
    doubled = function(n) { return n * 2; },
    isEven = function(n) { return n % 2 == 0; },
    square = function(n) { return n * n; };

/** Stub functions. */
var stubA = function() { return 'a'; },
    stubB = function() { return 'b'; },
    stubC = function() { return 'c'; };

var stubTrue = function() { return true; },
    stubFalse = function() { return false; };

var stubNaN = function() { return NaN; },
    stubNull = function() { return null; };

var stubZero = function() { return 0; },
    stubOne = function() { return 1; },
    stubTwo = function() { return 2; },
    stubThree = function() { return 3; },
    stubFour = function() { return 4; };

var stubArray = function() { return []; },
    stubObject = function() { return {}; },
    stubString = function() { return ''; };

/** List of Latin Unicode letters. */
var burredLetters = [
  // Latin-1 Supplement letters.
  '\xc0', '\xc1', '\xc2', '\xc3', '\xc4', '\xc5', '\xc6', '\xc7', '\xc8', '\xc9', '\xca', '\xcb', '\xcc', '\xcd', '\xce', '\xcf',
  '\xd0', '\xd1', '\xd2', '\xd3', '\xd4', '\xd5', '\xd6',         '\xd8', '\xd9', '\xda', '\xdb', '\xdc', '\xdd', '\xde', '\xdf',
  '\xe0', '\xe1', '\xe2', '\xe3', '\xe4', '\xe5', '\xe6', '\xe7', '\xe8', '\xe9', '\xea', '\xeb', '\xec', '\xed', '\xee', '\xef',
  '\xf0', '\xf1', '\xf2', '\xf3', '\xf4', '\xf5', '\xf6',         '\xf8', '\xf9', '\xfa', '\xfb', '\xfc', '\xfd', '\xfe', '\xff',
  // Latin Extended-A letters.
  '\u0100', '\u0101', '\u0102', '\u0103', '\u0104', '\u0105', '\u0106', '\u0107', '\u0108', '\u0109', '\u010a', '\u010b', '\u010c', '\u010d', '\u010e', '\u010f',
  '\u0110', '\u0111', '\u0112', '\u0113', '\u0114', '\u0115', '\u0116', '\u0117', '\u0118', '\u0119', '\u011a', '\u011b', '\u011c', '\u011d', '\u011e', '\u011f',
  '\u0120', '\u0121', '\u0122', '\u0123', '\u0124', '\u0125', '\u0126', '\u0127', '\u0128', '\u0129', '\u012a', '\u012b', '\u012c', '\u012d', '\u012e', '\u012f',
  '\u0130', '\u0131', '\u0132', '\u0133', '\u0134', '\u0135', '\u0136', '\u0137', '\u0138', '\u0139', '\u013a', '\u013b', '\u013c', '\u013d', '\u013e', '\u013f',
  '\u0140', '\u0141', '\u0142', '\u0143', '\u0144', '\u0145', '\u0146', '\u0147', '\u0148', '\u0149', '\u014a', '\u014b', '\u014c', '\u014d', '\u014e', '\u014f',
  '\u0150', '\u0151', '\u0152', '\u0153', '\u0154', '\u0155', '\u0156', '\u0157', '\u0158', '\u0159', '\u015a', '\u015b', '\u015c', '\u015d', '\u015e', '\u015f',
  '\u0160', '\u0161', '\u0162', '\u0163', '\u0164', '\u0165', '\u0166', '\u0167', '\u0168', '\u0169', '\u016a', '\u016b', '\u016c', '\u016d', '\u016e', '\u016f',
  '\u0170', '\u0171', '\u0172', '\u0173', '\u0174', '\u0175', '\u0176', '\u0177', '\u0178', '\u0179', '\u017a', '\u017b', '\u017c', '\u017d', '\u017e', '\u017f'
];

/** List of combining diacritical marks. */
var comboMarks = [
  '\u0300', '\u0301', '\u0302', '\u0303', '\u0304', '\u0305', '\u0306', '\u0307', '\u0308', '\u0309', '\u030a', '\u030b', '\u030c', '\u030d', '\u030e', '\u030f',
  '\u0310', '\u0311', '\u0312', '\u0313', '\u0314', '\u0315', '\u0316', '\u0317', '\u0318', '\u0319', '\u031a', '\u031b', '\u031c', '\u031d', '\u031e', '\u031f',
  '\u0320', '\u0321', '\u0322', '\u0323', '\u0324', '\u0325', '\u0326', '\u0327', '\u0328', '\u0329', '\u032a', '\u032b', '\u032c', '\u032d', '\u032e', '\u032f',
  '\u0330', '\u0331', '\u0332', '\u0333', '\u0334', '\u0335', '\u0336', '\u0337', '\u0338', '\u0339', '\u033a', '\u033b', '\u033c', '\u033d', '\u033e', '\u033f',
  '\u0340', '\u0341', '\u0342', '\u0343', '\u0344', '\u0345', '\u0346', '\u0347', '\u0348', '\u0349', '\u034a', '\u034b', '\u034c', '\u034d', '\u034e', '\u034f',
  '\u0350', '\u0351', '\u0352', '\u0353', '\u0354', '\u0355', '\u0356', '\u0357', '\u0358', '\u0359', '\u035a', '\u035b', '\u035c', '\u035d', '\u035e', '\u035f',
  '\u0360', '\u0361', '\u0362', '\u0363', '\u0364', '\u0365', '\u0366', '\u0367', '\u0368', '\u0369', '\u036a', '\u036b', '\u036c', '\u036d', '\u036e', '\u036f',
  '\ufe20', '\ufe21', '\ufe22', '\ufe23'
];

/** List of converted Latin Unicode letters. */
var deburredLetters = [
  // Converted Latin-1 Supplement letters.
  'A',  'A', 'A', 'A', 'A', 'A', 'Ae', 'C',  'E', 'E', 'E', 'E', 'I', 'I', 'I',
  'I',  'D', 'N', 'O', 'O', 'O', 'O',  'O',  'O', 'U', 'U', 'U', 'U', 'Y', 'Th',
  'ss', 'a', 'a', 'a', 'a', 'a', 'a',  'ae', 'c', 'e', 'e', 'e', 'e', 'i', 'i',  'i',
  'i',  'd', 'n', 'o', 'o', 'o', 'o',  'o',  'o', 'u', 'u', 'u', 'u', 'y', 'th', 'y',
  // Converted Latin Extended-A letters.
  'A', 'a', 'A', 'a', 'A', 'a', 'C', 'c', 'C', 'c', 'C', 'c', 'C', 'c',
  'D', 'd', 'D', 'd', 'E', 'e', 'E', 'e', 'E', 'e', 'E', 'e', 'E', 'e',
  'G', 'g', 'G', 'g', 'G', 'g', 'G', 'g', 'H', 'h', 'H', 'h',
  'I', 'i', 'I', 'i', 'I', 'i', 'I', 'i', 'I', 'i', 'IJ', 'ij', 'J', 'j',
  'K', 'k', 'k', 'L', 'l', 'L', 'l', 'L', 'l', 'L', 'l', 'L', 'l',
  'N', 'n', 'N', 'n', 'N', 'n', "'n", 'N', 'n',
  'O', 'o', 'O', 'o', 'O', 'o', 'Oe', 'oe',
  'R', 'r', 'R', 'r', 'R', 'r', 'S', 's', 'S', 's', 'S', 's', 'S', 's',
  'T', 't', 'T', 't', 'T', 't',
  'U', 'u', 'U', 'u', 'U', 'u', 'U', 'u', 'U', 'u', 'U', 'u',
  'W', 'w', 'Y', 'y', 'Y', 'Z', 'z', 'Z', 'z', 'Z', 'z', 's'
];

/** Used to provide falsey values to methods. */
var falsey = [, null, undefined, false, 0, NaN, ''];

/** Used to specify the emoji style glyph variant of characters. */
var emojiVar = '\ufe0f';

/** Used to provide empty values to methods. */
var empties = [[], {}].concat(falsey.slice(1));

/** Used to test error objects. */
var errors = [
  new Error,
  new EvalError,
  new RangeError,
  new ReferenceError,
  new SyntaxError,
  new TypeError,
  new URIError
];

/** List of fitzpatrick modifiers. */
var fitzModifiers = [
  '\ud83c\udffb',
  '\ud83c\udffc',
  '\ud83c\udffd',
  '\ud83c\udffe',
  '\ud83c\udfff'
];

/** Used to provide primitive values to methods. */
var primitives = [null, undefined, false, true, 1, NaN, 'a'];

/** Used to check whether methods support typed arrays. */
var typedArrays = [
  'Float32Array',
  'Float64Array',
  'Int8Array',
  'Int16Array',
  'Int32Array',
  'Uint8Array',
  'Uint8ClampedArray',
  'Uint16Array',
  'Uint32Array'
];

/** Used to check whether methods support array views. */
var arrayViews = typedArrays.concat('DataView');

/** The file path of the lodash file to test. */
var filePath = (function() {
  var min = 2,
      result = params || [];

  if (phantom) {
    min = 0;
    result = params = phantom.args || require('system').args;
  }
  var last = result[result.length - 1];
  result = (result.length > min && !/test(?:\.js)?$/.test(last)) ? last : '../node_modules/lodash/lodash.js';

  if (!amd) {
    try {
      result = require('fs').realpathSync(result);
    } catch (e) {}

    try {
      result = require.resolve(result);
    } catch (e) {}
  }
  return result;
}());

/** The `ui` object. */
var ui = root.ui || (root.ui = {
  'buildPath': filePath,
  'loaderPath': '',
  'isModularize': /\b(?:amd|commonjs|es|node|npm|(index|main)\.js)\b/.test(filePath),
  'isStrict': /\bes\b/.test(filePath) || 'default' in require(filePath),
  'urlParams': {}
});

/** The basename of the lodash file to test. */
var basename = /[\w.-]+$/.exec(filePath)[0];

/** Used to indicate testing a modularized build. */
var isModularize = ui.isModularize;

/** Detect if testing `npm` modules. */
var isNpm = isModularize && /\bnpm\b/.test([ui.buildPath, ui.urlParams.build]);

/** Detect if running in PhantomJS. */
var isPhantom = phantom || (typeof callPhantom == 'function');

/** Detect if lodash is in strict mode. */
var isStrict = ui.isStrict;

/*--------------------------------------------------------------------------*/

// Leak to avoid sporadic `noglobals` fails on Edge in Sauce Labs.
root.msWDfn = undefined;

// Assign `setTimeout` to itself to avoid being flagged as a leak.
setProperty(root, 'setTimeout', setTimeout);

/*--------------------------------------------------------------------------*/

/** Used to test Web Workers. */
var Worker = !(ui.isForeign || ui.isSauceLabs || isModularize) &&
  (document && document.origin != 'null') && root.Worker;

/** Poison the free variable `root` in Node.js */
try {
  defineProperty(global.root, 'root', {
    'configurable': false,
    'enumerable': false,
    'get': function() { throw new ReferenceError; }
  });
} catch (e) {}

/** Load stable Lodash. */
var lodashStable = root.lodashStable;
if (!lodashStable) {
  try {
    lodashStable = interopRequire('../node_modules/lodash/lodash.js');
  } catch (e) {
    console.log('Error: The stable lodash dev dependency should be at least a version behind master branch.');
  }
  lodashStable = lodashStable.noConflict();
}

/** The `lodash` function to test. */
var _ = root._ || (root._ = interopRequire(filePath));

/** Used to test pseudo private map caches. */
var mapCaches = (function() {
  var MapCache = _.memoize.Cache;
  var result = {
    'Hash': new MapCache().__data__.hash.constructor,
    'MapCache': MapCache
  };
  _.isMatchWith({ 'a': 1 }, { 'a': 1 }, function() {
    var stack = lodashStable.last(arguments);
    result.ListCache = stack.__data__.constructor;
    result.Stack = stack.constructor;
  });
  return result;
}());

/** Used to detect instrumented istanbul code coverage runs. */
var coverage = root.__coverage__ || root[lodashStable.find(lodashStable.keys(root), function(key) {
  return /^(?:\$\$cov_\d+\$\$)$/.test(key);
})];

/** Used to test async functions. */
var asyncFunc = lodashStable.attempt(function() {
  return Function('return async () => {}');
});

/** Used to test generator functions. */
var genFunc = lodashStable.attempt(function() {
  return Function('return function*(){}');
});

/** Used to restore the `_` reference. */
var oldDash = root._;

/**
 * Used to check for problems removing whitespace. For a whitespace reference,
 * see [V8's unit test](https://code.google.com/p/v8/source/browse/branches/bleeding_edge/test/mjsunit/whitespaces.js).
 */
var whitespace = lodashStable.filter([
  // Basic whitespace characters.
  ' ', '\t', '\x0b', '\f', '\xa0', '\ufeff',

  // Line terminators.
  '\n', '\r', '\u2028', '\u2029',

  // Unicode category "Zs" space separators.
  '\u1680', '\u180e', '\u2000', '\u2001', '\u2002', '\u2003', '\u2004', '\u2005',
  '\u2006', '\u2007', '\u2008', '\u2009', '\u200a', '\u202f', '\u205f', '\u3000'
],
function(chr) { return /\s/.exec(chr); })
.join('');

/**
 * Creates a custom error object.
 *
 * @private
 * @constructor
 * @param {string} message The error message.
 */
function CustomError(message) {
  this.name = 'CustomError';
  this.message = message;
}

CustomError.prototype = lodashStable.create(Error.prototype, {
  'constructor': CustomError
});

/**
 * Removes all own enumerable string keyed properties from a given object.
 *
 * @private
 * @param {Object} object The object to empty.
 */
function emptyObject(object) {
  lodashStable.forOwn(object, function(value, key, object) {
    delete object[key];
  });
}

/**
 * Extracts the unwrapped value from its wrapper.
 *
 * @private
 * @param {Object} wrapper The wrapper to unwrap.
 * @returns {*} Returns the unwrapped value.
 */
function getUnwrappedValue(wrapper) {
  var index = -1,
      actions = wrapper.__actions__,
      length = actions.length,
      result = wrapper.__wrapped__;

  while (++index < length) {
    var args = [result],
        action = actions[index];

    push.apply(args, action.args);
    result = action.func.apply(action.thisArg, args);
  }
  return result;
}

/**
 * Loads the module of `id`. If the module has an `exports.default`, the
 * exported default value is returned as the resolved module.
 *
 * @private
 * @param {string} id The identifier of the module to resolve.
 * @returns {*} Returns the resolved module.
 */
function interopRequire(id) {
  var result = require(id);
  return 'default' in result ? result['default'] : result;
}

/**
 * Sets a non-enumerable property value on `object`.
 *
 * Note: This function is used to avoid a bug in older versions of V8 where
 * overwriting non-enumerable built-ins makes them enumerable.
 * See https://code.google.com/p/v8/issues/detail?id=1623
 *
 * @private
 * @param {Object} object The object modify.
 * @param {string} key The name of the property to set.
 * @param {*} value The property value.
 */
function setProperty(object, key, value) {
  try {
    defineProperty(object, key, {
      'configurable': true,
      'enumerable': false,
      'writable': true,
      'value': value
    });
  } catch (e) {
    object[key] = value;
  }
  return object;
}

/**
 * Skips a given number of tests with a passing result.
 *
 * @private
 * @param {Object} assert The QUnit assert object.
 * @param {number} [count=1] The number of tests to skip.
 */
function skipAssert(assert, count) {
  count || (count = 1);
  while (count--) {
    assert.ok(true, 'test skipped');
  }
}

/**
 * Converts `array` to an `arguments` object.
 *
 * @private
 * @param {Array} array The array to convert.
 * @returns {Object} Returns the converted `arguments` object.
 */
function toArgs(array) {
  return (function() { return arguments; }.apply(undefined, array));
}

/*--------------------------------------------------------------------------*/

// Add bizarro values.
(function() {
  return; // fixme
  if (document || (typeof require != 'function')) {
    return;
  }
  var nativeString = fnToString.call(toString),
      reToString = /toString/g;

  function createToString(funcName) {
    return lodashStable.constant(nativeString.replace(reToString, funcName));
  }

  // Allow bypassing native checks.
  setProperty(funcProto, 'toString', function wrapper() {
    setProperty(funcProto, 'toString', fnToString);
    var result = lodashStable.has(this, 'toString') ? this.toString() : fnToString.call(this);
    setProperty(funcProto, 'toString', wrapper);
    return result;
  });

  // Add prototype extensions.
  funcProto._method = noop;

  // Set bad shims.
  setProperty(Object, 'create', undefined);
  setProperty(Object, 'getOwnPropertySymbols', undefined);

  var _propertyIsEnumerable = objectProto.propertyIsEnumerable;
  setProperty(objectProto, 'propertyIsEnumerable', function(key) {
    return !(key == 'valueOf' && this && this.valueOf === 1) && _propertyIsEnumerable.call(this, key);
  });

  if (Buffer) {
    defineProperty(root, 'Buffer', {
      'configurable': true,
      'enumerable': true,
      'get': function get() {
        var caller = get.caller,
            name = caller ? caller.name : '';

        if (!(name == 'runInContext' || name.length == 1 || /\b_\.isBuffer\b/.test(caller))) {
          return Buffer;
        }
      }
    });
  }
  if (Map) {
    setProperty(root, 'Map', (function() {
      var count = 0;
      return function() {
        if (count++) {
          return new Map;
        }
        setProperty(root, 'Map', Map);
        return {};
      };
    }()));

    setProperty(root.Map, 'toString', createToString('Map'));
  }
  setProperty(root, 'Promise', noop);
  setProperty(root, 'Set', noop);
  setProperty(root, 'Symbol', undefined);
  setProperty(root, 'WeakMap', noop);

  // Fake `WinRTError`.
  setProperty(root, 'WinRTError', Error);

  // Clear cache so lodash can be reloaded.
  emptyObject(require.cache);

  // Load lodash and expose it to the bad extensions/shims.
  lodashBizarro = interopRequire(filePath);
  root._ = oldDash;

  // Restore built-in methods.
  setProperty(Object, 'create', create);
  setProperty(objectProto, 'propertyIsEnumerable', _propertyIsEnumerable);
  setProperty(root, 'Buffer', Buffer);

  if (getSymbols) {
    Object.getOwnPropertySymbols = getSymbols;
  } else {
    delete Object.getOwnPropertySymbols;
  }
  if (Map) {
    setProperty(root, 'Map', Map);
  } else {
    delete root.Map;
  }
  if (Promise) {
    setProperty(root, 'Promise', Promise);
  } else {
    delete root.Promise;
  }
  if (Set) {
    setProperty(root, 'Set', Set);
  } else {
    delete root.Set;
  }
  if (Symbol) {
    setProperty(root, 'Symbol', Symbol);
  } else {
    delete root.Symbol;
  }
  if (WeakMap) {
    setProperty(root, 'WeakMap', WeakMap);
  } else {
    delete root.WeakMap;
  }
  delete root.WinRTError;
  delete funcProto._method;
}());

// Add other realm values from the `vm` module.
lodashStable.attempt(function() {
  lodashStable.assign(realm, require('vm').runInNewContext([
    '(function() {',
    '  var noop = function() {},',
    '      root = this;',
    '',
    '  var object = {',
    "    'ArrayBuffer': root.ArrayBuffer,",
    "    'arguments': (function() { return arguments; }(1, 2, 3)),",
    "    'array': [1],",
    "    'arrayBuffer': root.ArrayBuffer ? new root.ArrayBuffer : undefined,",
    "    'boolean': Object(false),",
    "    'date': new Date,",
    "    'errors': [new Error, new EvalError, new RangeError, new ReferenceError, new SyntaxError, new TypeError, new URIError],",
    "    'function': noop,",
    "    'map': root.Map ? new root.Map : undefined,",
    "    'nan': NaN,",
    "    'null': null,",
    "    'number': Object(0),",
    "    'object': { 'a': 1 },",
    "    'promise': root.Promise ? Promise.resolve(1) : undefined,",
    "    'regexp': /x/,",
    "    'set': root.Set ? new root.Set : undefined,",
    "    'string': Object('a'),",
    "    'symbol': root.Symbol ? root.Symbol() : undefined,",
    "    'undefined': undefined,",
    "    'weakMap': root.WeakMap ? new root.WeakMap : undefined,",
    "    'weakSet': root.WeakSet ? new root.WeakSet : undefined",
    '  };',
    '',
    "  ['" + arrayViews.join("', '") + "'].forEach(function(type) {",
    '    var Ctor = root[type]',
    '    object[type] = Ctor;',
    '    object[type.toLowerCase()] = Ctor ? new Ctor(new ArrayBuffer(24)) : undefined;',
    '  });',
    '',
    '  return object;',
    '}());'
  ].join('\n')));
});

// Add other realm values from an iframe.
lodashStable.attempt(function() {
  _._realm = realm;

  var iframe = document.createElement('iframe');
  iframe.frameBorder = iframe.height = iframe.width = 0;
  body.appendChild(iframe);

  var idoc = (idoc = iframe.contentDocument || iframe.contentWindow).document || idoc;
  idoc.write([
    '<html>',
    '<body>',
    '<script>',
    'var _ = parent._,',
    '    noop = function() {},',
    '    root = this;',
    '',
    'var object = {',
    "  'ArrayBuffer': root.ArrayBuffer,",
    "  'arguments': (function() { return arguments; }(1, 2, 3)),",
    "  'array': [1],",
    "  'arrayBuffer': root.ArrayBuffer ? new root.ArrayBuffer : undefined,",
    "  'boolean': Object(false),",
    "  'date': new Date,",
    "  'element': document.body,",
    "  'errors': [new Error, new EvalError, new RangeError, new ReferenceError, new SyntaxError, new TypeError, new URIError],",
    "  'function': noop,",
    "  'map': root.Map ? new root.Map : undefined,",
    "  'nan': NaN,",
    "  'null': null,",
    "  'number': Object(0),",
    "  'object': { 'a': 1 },",
    "  'promise': root.Promise ? Promise.resolve(1) : undefined,",
    "  'regexp': /x/,",
    "  'set': root.Set ? new root.Set : undefined,",
    "  'string': Object('a'),",
    "  'symbol': root.Symbol ? root.Symbol() : undefined,",
    "  'undefined': undefined,",
    "  'weakMap': root.WeakMap ? new root.WeakMap : undefined,",
    "  'weakSet': root.WeakSet ? new root.WeakSet : undefined",
    '};',
    '',
    "_.each(['" + arrayViews.join("', '") + "'], function(type) {",
    '  var Ctor = root[type];',
    '  object[type] = Ctor;',
    '  object[type.toLowerCase()] = Ctor ? new Ctor(new ArrayBuffer(24)) : undefined;',
    '});',
    '',
    '_.assign(_._realm, object);',
    '</script>',
    '</body>',
    '</html>'
  ].join('\n'));

  idoc.close();
  delete _._realm;
});

// Add a web worker.
lodashStable.attempt(function() {
  var worker = new Worker('./asset/worker.js?t=' + (+new Date));
  worker.addEventListener('message', function(e) {
    _._VERSION = e.data || '';
  }, false);

  worker.postMessage(ui.buildPath);
});

// Expose internal modules for better code coverage.
lodashStable.attempt(function() {
  var path = require('path'),
      basePath = path.dirname(filePath);

  if (isModularize && !(amd || isNpm)) {
    lodashStable.each([
      'baseEach',
      'isIndex',
      'isIterateeCall',
      'memoizeCapped'
    ], function(funcName) {
      _['_' + funcName] = interopRequire(path.join(basePath, '_' + funcName));
    });
  }
});

export {
  HOT_COUNT,
  LARGE_ARRAY_SIZE,
  FUNC_ERROR_TEXT,
  MAX_MEMOIZE_SIZE,
  MAX_SAFE_INTEGER,
  MAX_INTEGER,
  MAX_ARRAY_LENGTH,
  MAX_ARRAY_INDEX,
  funcTag,
  numberTag,
  objectTag,
  lodashBizarro,
  arrayProto,
  funcProto,
  objectProto,
  numberProto,
  stringProto,
  phantom,
  amd,
  args,
  argv,
  defineProperty,
  document,
  body,
  create,
  fnToString,
  freeze,
  getSymbols,
  identity,
  noop,
  objToString,
  params,
  push,
  realm,
  slice,
  strictArgs,
  arrayBuffer,
  map,
  promise,
  set,
  symbol,
  weakMap,
  weakSet,
  add,
  doubled,
  isEven,
  square,
  stubA,
  stubB,
  stubC,
  stubTrue,
  stubFalse,
  stubNaN,
  stubNull,
  stubZero,
  stubOne,
  stubTwo,
  stubThree,
  stubFour,
  stubArray,
  stubObject,
  stubString,
  burredLetters,
  comboMarks,
  deburredLetters,
  falsey,
  emojiVar,
  empties,
  errors,
  fitzModifiers,
  primitives,
  typedArrays,
  arrayViews,
  filePath,
  ui,
  basename,
  isModularize,
  isNpm,
  isPhantom,
  isStrict,
  Worker,
  lodashStable,
  _,
  mapCaches,
  coverage,
  asyncFunc,
  genFunc,
  oldDash,
  whitespace,
  CustomError,
  emptyObject,
  getUnwrappedValue,
  interopRequire,
  setProperty,
  skipAssert,
  toArgs
};