code:
'use strict';
var anObject = require('../internals/an-object');
var iteratorClose = require('../internals/iterator-close');

// call something on iterator step with safe closing on error
module.exports = function (iterator, fn, value, ENTRIES) {
  try {
    return ENTRIES ? fn(anObject(value)[0], value[1]) : fn(value);
  } catch (error) {
    iteratorClose(iterator, 'throw', error);
  }
};


code:
'use strict';
module.exports = function (methodName, numArgs) {
  return numArgs === 1 ? function (object, arg) {
    return object[methodName](arg);
  } : function (object, arg1, arg2) {
    return object[methodName](arg1, arg2);
  };
};

license: mit


code:
'use strict';
var wellKnownSymbol = require('../internals/well-known-symbol');

var ITERATOR = wellKnownSymbol('iterator');
var SAFE_CLOSING = false;

try {
  var called = 0;
  var iteratorWithReturn = {
    next: function () {
      return { done: !!called++ };
    },
    'return': function () {
      SAFE_CLOSING = true;
    }
  };
  iteratorWithReturn[ITERATOR] = function () {
    return this;
  };
  // eslint-disable-next-line es/no-array-from, no-throw-literal -- required for testing
  Array.from(iteratorWithReturn, function () { throw 2; });
} catch (error) { /* empty */ }

module.exports = function (exec, SKIP_CLOSING) {
  try {
    if (!SKIP_CLOSING && !SAFE_CLOSING) return false;
  } catch (error) { return false; } // workaround of old WebKit + `eval` bug
  var ITERATION_SUPPORT = false;
  try {
    var object = {};
    object[ITERATOR] = function () {
      return {
        next: function () {
          return { done: ITERATION_SUPPORT = true };
        }
      };
    };
    exec(object);
  } catch (error) { /* empty */ }
  return ITERATION_SUPPORT;
};


code:
'use strict';
var uncurryThis = require('../internals/function-uncurry-this');

var toString = uncurryThis({}.toString);
var stringSlice = uncurryThis(''.slice);

module.exports = function (it) {
  return stringSlice(toString(it), 8, -1);
};


code:
'use strict';
var TO_STRING_TAG_SUPPORT = require('../internals/to-string-tag-support');
var isCallable = require('../internals/is-callable');
var classofRaw = require('../internals/classof-raw');
var wellKnownSymbol = require('../internals/well-known-symbol');

var TO_STRING_TAG = wellKnownSymbol('toStringTag');
var $Object = Object;

// ES3 wrong here
var CORRECT_ARGUMENTS = classofRaw(function () { return arguments; }()) === 'Arguments';

// fallback for IE11 Script Access Denied error
var tryGet = function (it, key) {
  try {
    return it[key];
  } catch (error) { /* empty */ }
};

// getting tag from ES6+ `Object.prototype.toString`
module.exports = TO_STRING_TAG_SUPPORT ? classofRaw : function (it) {
  var O, tag, result;
  return it === undefined ? 'Undefined' : it === null ? 'Null'
    // @@toStringTag case
    : typeof (tag = tryGet(O = $Object(it), TO_STRING_TAG)) == 'string' ? tag
    // builtinTag case
    : CORRECT_ARGUMENTS ? classofRaw(O)
    // ES3 arguments fallback
    : (result = classofRaw(O)) === 'Object' && isCallable(O.callee) ? 'Arguments' : result;
};


code:
'use strict';
// https://tc39.github.io/proposal-setmap-offrom/
var bind = require('../internals/function-bind-context');
var anObject = require('../internals/an-object');
var toObject = require('../internals/to-object');
var iterate = require('../internals/iterate');

module.exports = function (C, adder, ENTRY) {
  return function from(source /* , mapFn, thisArg */) {
    var O = toObject(source);
    var length = arguments.length;
    var mapFn = length > 1 ? arguments[1] : undefined;
    var mapping = mapFn !== undefined;
    var boundFunction = mapping ? bind(mapFn, length > 2 ? arguments[2] : undefined) : undefined;
    var result = new C();
    var n = 0;
    iterate(O, function (nextItem) {
      var entry = mapping ? boundFunction(nextItem, n++) : nextItem;
      if (ENTRY) adder(result, anObject(entry)[0], entry[1]);
      else adder(result, entry);
    });
    return result;
  };
};


code:
'use strict';
var anObject = require('../internals/an-object');

// https://tc39.github.io/proposal-setmap-offrom/
module.exports = function (C, adder, ENTRY) {
  return function of() {
    var result = new C();
    var length = arguments.length;
    for (var index = 0; index < length; index++) {
      var entry = arguments[index];
      if (ENTRY) adder(result, anObject(entry)[0], entry[1]);
      else adder(result, entry);
    } return result;
  };
};


code:
'use strict';
var create = require('../internals/object-create');
var defineBuiltInAccessor = require('../internals/define-built-in-accessor');
var defineBuiltIns = require('../internals/define-built-ins');
var bind = require('../internals/function-bind-context');
var anInstance = require('../internals/an-instance');
var isNullOrUndefined = require('../internals/is-null-or-undefined');
var iterate = require('../internals/iterate');
var defineIterator = require('../internals/iterator-define');
var createIterResultObject = require('../internals/create-iter-result-object');
var setSpecies = require('../internals/set-species');
var DESCRIPTORS = require('../internals/descriptors');
var fastKey = require('../internals/internal-metadata').fastKey;
var InternalStateModule = require('../internals/internal-state');

var setInternalState = InternalStateModule.set;
var internalStateGetterFor = InternalStateModule.getterFor;

module.exports = {
  getConstructor: function (wrapper, CONSTRUCTOR_NAME, IS_MAP, ADDER) {
    var Constructor = wrapper(function (that, iterable) {
      anInstance(that, Prototype);
      setInternalState(that, {
        type: CONSTRUCTOR_NAME,
        index: create(null),
        first: null,
        last: null,
        size: 0
      });
      if (!DESCRIPTORS) that.size = 0;
      if (!isNullOrUndefined(iterable)) iterate(iterable, that[ADDER], { that: that, AS_ENTRIES: IS_MAP });
    });

    var Prototype = Constructor.prototype;

    var getInternalState = internalStateGetterFor(CONSTRUCTOR_NAME);

    var define = function (that, key, value) {
      var state = getInternalState(that);
      var entry = getEntry(that, key);
      var previous, index;
      // change existing entry
      if (entry) {
        entry.value = value;
      // create new entry
      } else {
        state.last = entry = {
          index: index = fastKey(key, true),
          key: key,
          value: value,
          previous: previous = state.last,
          next: null,
          removed: false
        };
        if (!state.first) state.first = entry;
        if (previous) previous.next = entry;
        if (DESCRIPTORS) state.size++;
        else that.size++;
        // add to index
        if (index !== 'F') state.index[index] = entry;
      } return that;
    };

    var getEntry = function (that, key) {
      var state = getInternalState(that);
      // fast case
      var index = fastKey(key);
      var entry;
      if (index !== 'F') return state.index[index];
      // frozen object case
      for (entry = state.first; entry; entry = entry.next) {
        if (entry.key === key) return entry;
      }
    };

    defineBuiltIns(Prototype, {
      // `{ Map, Set }.prototype.clear()` methods
      // https://tc39.es/ecma262/#sec-map.prototype.clear
      // https://tc39.es/ecma262/#sec-set.prototype.clear
      clear: function clear() {
        var that = this;
        var state = getInternalState(that);
        var entry = state.first;
        while (entry) {
          entry.removed = true;
          if (entry.previous) entry.previous = entry.previous.next = null;
          entry = entry.next;
        }
        state.first = state.last = null;
        state.index = create(null);
        if (DESCRIPTORS) state.size = 0;
        else that.size = 0;
      },
      // `{ Map, Set }.prototype.delete(key)` methods
      // https://tc39.es/ecma262/#sec-map.prototype.delete
      // https://tc39.es/ecma262/#sec-set.prototype.delete
      'delete': function (key) {
        var that = this;
        var state = getInternalState(that);
        var entry = getEntry(that, key);
        if (entry) {
          var next = entry.next;
          var prev = entry.previous;
          delete state.index[entry.index];
          entry.removed = true;
          if (prev) prev.next = next;
          if (next) next.previous = prev;
          if (state.first === entry) state.first = next;
          if (state.last === entry) state.last = prev;
          if (DESCRIPTORS) state.size--;
          else that.size--;
        } return !!entry;
      },
      // `{ Map, Set }.prototype.forEach(callbackfn, thisArg = undefined)` methods
      // https://tc39.es/ecma262/#sec-map.prototype.foreach
      // https://tc39.es/ecma262/#sec-set.prototype.foreach
      forEach: function forEach(callbackfn /* , that = undefined */) {
        var state = getInternalState(this);
        var boundFunction = bind(callbackfn, arguments.length > 1 ? arguments[1] : undefined);
        var entry;
        while (entry = entry ? entry.next : state.first) {
          boundFunction(entry.value, entry.key, this);
          // revert to the last existing entry
          while (entry && entry.removed) entry = entry.previous;
        }
      },
      // `{ Map, Set}.prototype.has(key)` methods
      // https://tc39.es/ecma262/#sec-map.prototype.has
      // https://tc39.es/ecma262/#sec-set.prototype.has
      has: function has(key) {
        return !!getEntry(this, key);
      }
    });

    defineBuiltIns(Prototype, IS_MAP ? {
      // `Map.prototype.get(key)` method
      // https://tc39.es/ecma262/#sec-map.prototype.get
      get: function get(key) {
        var entry = getEntry(this, key);
        return entry && entry.value;
      },
      // `Map.prototype.set(key, value)` method
      // https://tc39.es/ecma262/#sec-map.prototype.set
      set: function set(key, value) {
        return define(this, key === 0 ? 0 : key, value);
      }
    } : {
      // `Set.prototype.add(value)` method
      // https://tc39.es/ecma262/#sec-set.prototype.add
      add: function add(value) {
        return define(this, value = value === 0 ? 0 : value, value);
      }
    });
    if (DESCRIPTORS) defineBuiltInAccessor(Prototype, 'size', {
      configurable: true,
      get: function () {
        return getInternalState(this).size;
      }
    });
    return Constructor;
  },
  setStrong: function (Constructor, CONSTRUCTOR_NAME, IS_MAP) {
    var ITERATOR_NAME = CONSTRUCTOR_NAME + ' Iterator';
    var getInternalCollectionState = internalStateGetterFor(CONSTRUCTOR_NAME);
    var getInternalIteratorState = internalStateGetterFor(ITERATOR_NAME);
    // `{ Map, Set }.prototype.{ keys, values, entries, @@iterator }()` methods
    // https://tc39.es/ecma262/#sec-map.prototype.entries
    // https://tc39.es/ecma262/#sec-map.prototype.keys
    // https://tc39.es/ecma262/#sec-map.prototype.values
    // https://tc39.es/ecma262/#sec-map.prototype-@@iterator
    // https://tc39.es/ecma262/#sec-set.prototype.entries
    // https://tc39.es/ecma262/#sec-set.prototype.keys
    // https://tc39.es/ecma262/#sec-set.prototype.values
    // https://tc39.es/ecma262/#sec-set.prototype-@@iterator
    defineIterator(Constructor, CONSTRUCTOR_NAME, function (iterated, kind) {
      setInternalState(this, {
        type: ITERATOR_NAME,
        target: iterated,
        state: getInternalCollectionState(iterated),
        kind: kind,
        last: null
      });
    }, function () {
      var state = getInternalIteratorState(this);
      var kind = state.kind;
      var entry = state.last;
      // revert to the last existing entry
      while (entry && entry.removed) entry = entry.previous;
      // get next entry
      if (!state.target || !(state.last = entry = entry ? entry.next : state.state.first)) {
        // or finish the iteration
        state.target = null;
        return createIterResultObject(undefined, true);
      }
      // return step by kind
      if (kind === 'keys') return createIterResultObject(entry.key, false);
      if (kind === 'values') return createIterResultObject(entry.value, false);
      return createIterResultObject([entry.key, entry.value], false);
    }, IS_MAP ? 'entries' : 'values', !IS_MAP, true);

    // `{ Map, Set }.prototype[@@species]` accessors
    // https://tc39.es/ecma262/#sec-get-map-@@species
    // https://tc39.es/ecma262/#sec-get-set-@@species
    setSpecies(CONSTRUCTOR_NAME);
  }
};


code:
'use strict';
var uncurryThis = require('../internals/function-uncurry-this');
var defineBuiltIns = require('../internals/define-built-ins');
var getWeakData = require('../internals/internal-metadata').getWeakData;
var anInstance = require('../internals/an-instance');
var anObject = require('../internals/an-object');
var isNullOrUndefined = require('../internals/is-null-or-undefined');
var isObject = require('../internals/is-object');
var iterate = require('../internals/iterate');
var ArrayIterationModule = require('../internals/array-iteration');
var hasOwn = require('../internals/has-own-property');
var InternalStateModule = require('../internals/internal-state');

var setInternalState = InternalStateModule.set;
var internalStateGetterFor = InternalStateModule.getterFor;
var find = ArrayIterationModule.find;
var findIndex = ArrayIterationModule.findIndex;
var splice = uncurryThis([].splice);
var id = 0;

// fallback for uncaught frozen keys
var uncaughtFrozenStore = function (state) {
  return state.frozen || (state.frozen = new UncaughtFrozenStore());
};

var UncaughtFrozenStore = function () {
  this.entries = [];
};

var findUncaughtFrozen = function (store, key) {
  return find(store.entries, function (it) {
    return it[0] === key;
  });
};

UncaughtFrozenStore.prototype = {
  get: function (key) {
    var entry = findUncaughtFrozen(this, key);
    if (entry) return entry[1];
  },
  has: function (key) {
    return !!findUncaughtFrozen(this, key);
  },
  set: function (key, value) {
    var entry = findUncaughtFrozen(this, key);
    if (entry) entry[1] = value;
    else this.entries.push([key, value]);
  },
  'delete': function (key) {
    var index = findIndex(this.entries, function (it) {
      return it[0] === key;
    });
    if (~index) splice(this.entries, index, 1);
    return !!~index;
  }
};

module.exports = {
  getConstructor: function (wrapper, CONSTRUCTOR_NAME, IS_MAP, ADDER) {
    var Constructor = wrapper(function (that, iterable) {
      anInstance(that, Prototype);
      setInternalState(that, {
        type: CONSTRUCTOR_NAME,
        id: id++,
        frozen: null
      });
      if (!isNullOrUndefined(iterable)) iterate(iterable, that[ADDER], { that: that, AS_ENTRIES: IS_MAP });
    });

    var Prototype = Constructor.prototype;

    var getInternalState = internalStateGetterFor(CONSTRUCTOR_NAME);

    var define = function (that, key, value) {
      var state = getInternalState(that);
      var data = getWeakData(anObject(key), true);
      if (data === true) uncaughtFrozenStore(state).set(key, value);
      else data[state.id] = value;
      return that;
    };

    defineBuiltIns(Prototype, {
      // `{ WeakMap, WeakSet }.prototype.delete(key)` methods
      // https://tc39.es/ecma262/#sec-weakmap.prototype.delete
      // https://tc39.es/ecma262/#sec-weakset.prototype.delete
      'delete': function (key) {
        var state = getInternalState(this);
        if (!isObject(key)) return false;
        var data = getWeakData(key);
        if (data === true) return uncaughtFrozenStore(state)['delete'](key);
        return data && hasOwn(data, state.id) && delete data[state.id];
      },
      // `{ WeakMap, WeakSet }.prototype.has(key)` methods
      // https://tc39.es/ecma262/#sec-weakmap.prototype.has
      // https://tc39.es/ecma262/#sec-weakset.prototype.has
      has: function has(key) {
        var state = getInternalState(this);
        if (!isObject(key)) return false;
        var data = getWeakData(key);
        if (data === true) return uncaughtFrozenStore(state).has(key);
        return data && hasOwn(data, state.id);
      }
    });

    defineBuiltIns(Prototype, IS_MAP ? {
      // `WeakMap.prototype.get(key)` method
      // https://tc39.es/ecma262/#sec-weakmap.prototype.get
      get: function get(key) {
        var state = getInternalState(this);
        if (isObject(key)) {
          var data = getWeakData(key);
          if (data === true) return uncaughtFrozenStore(state).get(key);
          if (data) return data[state.id];
        }
      },
      // `WeakMap.prototype.set(key, value)` method
      // https://tc39.es/ecma262/#sec-weakmap.prototype.set
      set: function set(key, value) {
        return define(this, key, value);
      }
    } : {
      // `WeakSet.prototype.add(value)` method
      // https://tc39.es/ecma262/#sec-weakset.prototype.add
      add: function add(value) {
        return define(this, value, true);
      }
    });

    return Constructor;
  }
};


code:
'use strict';
var $ = require('../internals/export');
var globalThis = require('../internals/global-this');
var uncurryThis = require('../internals/function-uncurry-this');
var isForced = require('../internals/is-forced');
var defineBuiltIn = require('../internals/define-built-in');
var InternalMetadataModule = require('../internals/internal-metadata');
var iterate = require('../internals/iterate');
var anInstance = require('../internals/an-instance');
var isCallable = require('../internals/is-callable');
var isNullOrUndefined = require('../internals/is-null-or-undefined');
var isObject = require('../internals/is-object');
var fails = require('../internals/fails');
var checkCorrectnessOfIteration = require('../internals/check-correctness-of-iteration');
var setToStringTag = require('../internals/set-to-string-tag');
var inheritIfRequired = require('../internals/inherit-if-required');

module.exports = function (CONSTRUCTOR_NAME, wrapper, common) {
  var IS_MAP = CONSTRUCTOR_NAME.indexOf('Map') !== -1;
  var IS_WEAK = CONSTRUCTOR_NAME.indexOf('Weak') !== -1;
  var ADDER = IS_MAP ? 'set' : 'add';
  var NativeConstructor = globalThis[CONSTRUCTOR_NAME];
  var NativePrototype = NativeConstructor && NativeConstructor.prototype;
  var Constructor = NativeConstructor;
  var exported = {};

  var fixMethod = function (KEY) {
    var uncurriedNativeMethod = uncurryThis(NativePrototype[KEY]);
    defineBuiltIn(NativePrototype, KEY,
      KEY === 'add' ? function add(value) {
        uncurriedNativeMethod(this, value === 0 ? 0 : value);
        return this;
      } : KEY === 'delete' ? function (key) {
        return IS_WEAK && !isObject(key) ? false : uncurriedNativeMethod(this, key === 0 ? 0 : key);
      } : KEY === 'get' ? function get(key) {
        return IS_WEAK && !isObject(key) ? undefined : uncurriedNativeMethod(this, key === 0 ? 0 : key);
      } : KEY === 'has' ? function has(key) {
        return IS_WEAK && !isObject(key) ? false : uncurriedNativeMethod(this, key === 0 ? 0 : key);
      } : function set(key, value) {
        uncurriedNativeMethod(this, key === 0 ? 0 : key, value);
        return this;
      }
    );
  };

  var REPLACE = isForced(
    CONSTRUCTOR_NAME,
    !isCallable(NativeConstructor) || !(IS_WEAK || NativePrototype.forEach && !fails(function () {
      new NativeConstructor().entries().next();
    }))
  );

  if (REPLACE) {
    // create collection constructor
    Constructor = common.getConstructor(wrapper, CONSTRUCTOR_NAME, IS_MAP, ADDER);
    InternalMetadataModule.enable();
  } else if (isForced(CONSTRUCTOR_NAME, true)) {
    var instance = new Constructor();
    // early implementations not supports chaining
    var HASNT_CHAINING = instance[ADDER](IS_WEAK ? {} : -0, 1) !== instance;
    // V8 ~ Chromium 40- weak-collections throws on primitives, but should return false
    var THROWS_ON_PRIMITIVES = fails(function () { instance.has(1); });
    // most early implementations doesn't supports iterables, most modern - not close it correctly
    // eslint-disable-next-line no-new -- required for testing
    var ACCEPT_ITERABLES = checkCorrectnessOfIteration(function (iterable) { new NativeConstructor(iterable); });
    // for early implementations -0 and +0 not the same
    var BUGGY_ZERO = !IS_WEAK && fails(function () {
      // V8 ~ Chromium 42- fails only with 5+ elements
      var $instance = new NativeConstructor();
      var index = 5;
      while (index--) $instance[ADDER](index, index);
      return !$instance.has(-0);
    });

    if (!ACCEPT_ITERABLES) {
      Constructor = wrapper(function (dummy, iterable) {
        anInstance(dummy, NativePrototype);
        var that = inheritIfRequired(new NativeConstructor(), dummy, Constructor);
        if (!isNullOrUndefined(iterable)) iterate(iterable, that[ADDER], { that: that, AS_ENTRIES: IS_MAP });
        return that;
      });
      Constructor.prototype = NativePrototype;
      NativePrototype.constructor = Constructor;
    }

    if (THROWS_ON_PRIMITIVES || BUGGY_ZERO) {
      fixMethod('delete');
      fixMethod('has');
      IS_MAP && fixMethod('get');
    }

    if (BUGGY_ZERO || HASNT_CHAINING) fixMethod(ADDER);

    // weak collections should not contains .clear method
    if (IS_WEAK && NativePrototype.clear) delete NativePrototype.clear;
  }

  exported[CONSTRUCTOR_NAME] = Constructor;
  $({ global: true, constructor: true, forced: Constructor !== NativeConstructor }, exported);

  setToStringTag(Constructor, CONSTRUCTOR_NAME);

  if (!IS_WEAK) common.setStrong(Constructor, CONSTRUCTOR_NAME, IS_MAP);

  return Constructor;
};


code:
'use strict';
// TODO: in core-js@4, move /modules/ dependencies to public entries for better optimization by tools like `preset-env`
require('../modules/es.map');
require('../modules/es.weak-map');
var getBuiltIn = require('../internals/get-built-in');
var create = require('../internals/object-create');
var isObject = require('../internals/is-object');

var $Object = Object;
var $TypeError = TypeError;
var Map = getBuiltIn('Map');
var WeakMap = getBuiltIn('WeakMap');

var Node = function () {
  // keys
  this.object = null;
  this.symbol = null;
  // child nodes
  this.primitives = null;
  this.objectsByIndex = create(null);
};

Node.prototype.get = function (key, initializer) {
  return this[key] || (this[key] = initializer());
};

Node.prototype.next = function (i, it, IS_OBJECT) {
  var store = IS_OBJECT
    ? this.objectsByIndex[i] || (this.objectsByIndex[i] = new WeakMap())
    : this.primitives || (this.primitives = new Map());
  var entry = store.get(it);
  if (!entry) store.set(it, entry = new Node());
  return entry;
};

var root = new Node();

module.exports = function () {
  var active = root;
  var length = arguments.length;
  var i, it;
  // for prevent leaking, start from objects
  for (i = 0; i < length; i++) {
    if (isObject(it = arguments[i])) active = active.next(i, it, true);
  }
  if (this === $Object && active === root) throw new $TypeError('Composite keys must contain a non-primitive component');
  for (i = 0; i < length; i++) {
    if (!isObject(it = arguments[i])) active = active.next(i, it, false);
  } return active;
};


code:
'use strict';
var hasOwn = require('../internals/has-own-property');
var ownKeys = require('../internals/own-keys');
var getOwnPropertyDescriptorModule = require('../internals/object-get-own-property-descriptor');
var definePropertyModule = require('../internals/object-define-property');

module.exports = function (target, source, exceptions) {
  var keys = ownKeys(source);
  var defineProperty = definePropertyModule.f;
  var getOwnPropertyDescriptor = getOwnPropertyDescriptorModule.f;
  for (var i = 0; i < keys.length; i++) {
    var key = keys[i];
    if (!hasOwn(target, key) && !(exceptions && hasOwn(exceptions, key))) {
      defineProperty(target, key, getOwnPropertyDescriptor(source, key));
    }
  }
};


code:
'use strict';
var wellKnownSymbol = require('../internals/well-known-symbol');

var MATCH = wellKnownSymbol('match');

module.exports = function (METHOD_NAME) {
  var regexp = /./;
  try {
    '/./'[METHOD_NAME](regexp);
  } catch (error1) {
    try {
      regexp[MATCH] = false;
      return '/./'[METHOD_NAME](regexp);
    } catch (error2) { /* empty */ }
  } return false;
};


code:
'use strict';
var fails = require('../internals/fails');

module.exports = !fails(function () {
  function F() { /* empty */ }
  F.prototype.constructor = null;
  // eslint-disable-next-line es/no-object-getprototypeof -- required for testing
  return Object.getPrototypeOf(new F()) !== F.prototype;
});


code:
'use strict';
var uncurryThis = require('../internals/function-uncurry-this');
var requireObjectCoercible = require('../internals/require-object-coercible');
var toString = require('../internals/to-string');

var quot = /"/g;
var replace = uncurryThis(''.replace);

// `CreateHTML` abstract operation
// https://tc39.es/ecma262/#sec-createhtml
module.exports = function (string, tag, attribute, value) {
  var S = toString(requireObjectCoercible(string));
  var p1 = '<' + tag;
  if (attribute !== '') p1 += ' ' + attribute + '="' + replace(toString(value), quot, '"') + '"';
  return p1 + '>' + S + '</' + tag + '>';
};


code:
'use strict';
// `CreateIterResultObject` abstract operation
// https://tc39.es/ecma262/#sec-createiterresultobject
module.exports = function (value, done) {
  return { value: value, done: done };
};


code:
'use strict';
var DESCRIPTORS = require('../internals/descriptors');
var definePropertyModule = require('../internals/object-define-property');
var createPropertyDescriptor = require('../internals/create-property-descriptor');

module.exports = DESCRIPTORS ? function (object, key, value) {
  return definePropertyModule.f(object, key, createPropertyDescriptor(1, value));
} : function (object, key, value) {
  object[key] = value;
  return object;
};


code:
'use strict';
module.exports = function (bitmap, value) {
  return {
    enumerable: !(bitmap & 1),
    configurable: !(bitmap & 2),
    writable: !(bitmap & 4),
    value: value
  };
};


code:
'use strict';
var DESCRIPTORS = require('../internals/descriptors');
var definePropertyModule = require('../internals/object-define-property');
var createPropertyDescriptor = require('../internals/create-property-descriptor');

module.exports = function (object, key, value) {
  if (DESCRIPTORS) definePropertyModule.f(object, key, createPropertyDescriptor(0, value));
  else object[key] = value;
};


code:
'use strict';
var uncurryThis = require('../internals/function-uncurry-this');
var fails = require('../internals/fails');
var padStart = require('../internals/string-pad').start;

var $RangeError = RangeError;
var $isFinite = isFinite;
var abs = Math.abs;
var DatePrototype = Date.prototype;
var nativeDateToISOString = DatePrototype.toISOString;
var thisTimeValue = uncurryThis(DatePrototype.getTime);
var getUTCDate = uncurryThis(DatePrototype.getUTCDate);
var getUTCFullYear = uncurryThis(DatePrototype.getUTCFullYear);
var getUTCHours = uncurryThis(DatePrototype.getUTCHours);
var getUTCMilliseconds = uncurryThis(DatePrototype.getUTCMilliseconds);
var getUTCMinutes = uncurryThis(DatePrototype.getUTCMinutes);
var getUTCMonth = uncurryThis(DatePrototype.getUTCMonth);
var getUTCSeconds = uncurryThis(DatePrototype.getUTCSeconds);

// `Date.prototype.toISOString` method implementation
// https://tc39.es/ecma262/#sec-date.prototype.toisostring
// PhantomJS / old WebKit fails here:
module.exports = (fails(function () {
  return nativeDateToISOString.call(new Date(-5e13 - 1)) !== '0385-07-25T07:06:39.999Z';
}) || !fails(function () {
  nativeDateToISOString.call(new Date(NaN));
})) ? function toISOString() {
  if (!$isFinite(thisTimeValue(this))) throw new $RangeError('Invalid time value');
  var date = this;
  var year = getUTCFullYear(date);
  var milliseconds = getUTCMilliseconds(date);
  var sign = year < 0 ? '-' : year > 9999 ? '+' : '';
  return sign + padStart(abs(year), sign ? 6 : 4, 0) +
    '-' + padStart(getUTCMonth(date) + 1, 2, 0) +
    '-' + padStart(getUTCDate(date), 2, 0) +
    'T' + padStart(getUTCHours(date), 2, 0) +
    ':' + padStart(getUTCMinutes(date), 2, 0) +
    ':' + padStart(getUTCSeconds(date), 2, 0) +
    '.' + padStart(milliseconds, 3, 0) +
    'Z';
} : nativeDateToISOString;


code:
'use strict';
var anObject = require('../internals/an-object');
var ordinaryToPrimitive = require('../internals/ordinary-to-primitive');

var $TypeError = TypeError;

// `Date.prototype[@@toPrimitive](hint)` method implementation
// https://tc39.es/ecma262/#sec-date.prototype-@@toprimitive
module.exports = function (hint) {
  anObject(this);
  if (hint === 'string' || hint === 'default') hint = 'string';
  else if (hint !== 'number') throw new $TypeError('Incorrect hint');
  return ordinaryToPrimitive(this, hint);
};


code:
'use strict';
var makeBuiltIn = require('../internals/make-built-in');
var defineProperty = require('../internals/object-define-property');

module.exports = function (target, name, descriptor) {
  if (descriptor.get) makeBuiltIn(descriptor.get, name, { getter: true });
  if (descriptor.set) makeBuiltIn(descriptor.set, name, { setter: true });
  return defineProperty.f(target, name, descriptor);
};


code:
'use strict';
var isCallable = require('../internals/is-callable');
var definePropertyModule = require('../internals/object-define-property');
var makeBuiltIn = require('../internals/make-built-in');
var defineGlobalProperty = require('../internals/define-global-property');

module.exports = function (O, key, value, options) {
  if (!options) options = {};
  var simple = options.enumerable;
  var name = options.name !== undefined ? options.name : key;
  if (isCallable(value)) makeBuiltIn(value, name, options);
  if (options.global) {
    if (simple) O[key] = value;
    else defineGlobalProperty(key, value);
  } else {
    try {
      if (!options.unsafe) delete O[key];
      else if (O[key]) simple = true;
    } catch (error) { /* empty */ }
    if (simple) O[key] = value;
    else definePropertyModule.f(O, key, {
      value: value,
      enumerable: false,
      configurable: !options.nonConfigurable,
      writable: !options.nonWritable
    });
  } return O;
};


code:
'use strict';
var defineBuiltIn = require('../internals/define-built-in');

module.exports = function (target, src, options) {
  for (var key in src) defineBuiltIn(target, key, src[key], options);
  return target;
};


code:
'use strict';
var globalThis = require('../internals/global-this');

// eslint-disable-next-line es/no-object-defineproperty -- safe
var defineProperty = Object.defineProperty;

module.exports = function (key, value) {
  try {
    defineProperty(globalThis, key, { value: value, configurable: true, writable: true });
  } catch (error) {
    globalThis[key] = value;
  } return value;
};


code:
'use strict';
var tryToString = require('../internals/try-to-string');

var $TypeError = TypeError;

module.exports = function (O, P) {
  if (!delete O[P]) throw new $TypeError('Cannot delete property ' + tryToString(P) + ' of ' + tryToString(O));
};


code:
'use strict';
var fails = require('../internals/fails');

// Detect IE8's incomplete defineProperty implementation
module.exports = !fails(function () {
  // eslint-disable-next-line es/no-object-defineproperty -- required for testing
  return Object.defineProperty({}, 1, { get: function () { return 7; } })[1] !== 7;
});


code:
'use strict';
var globalThis = require('../internals/global-this');
var getBuiltInNodeModule = require('../internals/get-built-in-node-module');
var PROPER_STRUCTURED_CLONE_TRANSFER = require('../internals/structured-clone-proper-transfer');

var structuredClone = globalThis.structuredClone;
var $ArrayBuffer = globalThis.ArrayBuffer;
var $MessageChannel = globalThis.MessageChannel;
var detach = false;
var WorkerThreads, channel, buffer, $detach;

if (PROPER_STRUCTURED_CLONE_TRANSFER) {
  detach = function (transferable) {
    structuredClone(transferable, { transfer: [transferable] });
  };
} else if ($ArrayBuffer) try {
  if (!$MessageChannel) {
    WorkerThreads = getBuiltInNodeModule('worker_threads');
    if (WorkerThreads) $MessageChannel = WorkerThreads.MessageChannel;
  }

  if ($MessageChannel) {
    channel = new $MessageChannel();
    buffer = new $ArrayBuffer(2);

    $detach = function (transferable) {
      channel.port1.postMessage(null, [transferable]);
    };

    if (buffer.byteLength === 2) {
      $detach(buffer);
      if (buffer.byteLength === 0) detach = $detach;
    }
  }
} catch (error) { /* empty */ }

module.exports = detach;


code:
'use strict';
var globalThis = require('../internals/global-this');
var isObject = require('../internals/is-object');

var document = globalThis.document;
// typeof document.createElement is 'object' in old IE
var EXISTS = isObject(document) && isObject(document.createElement);

module.exports = function (it) {
  return EXISTS ? document.createElement(it) : {};
};


code:
'use strict';
var $TypeError = TypeError;
var MAX_SAFE_INTEGER = 0x1FFFFFFFFFFFFF; // 2 ** 53 - 1 == 9007199254740991

module.exports = function (it) {
  if (it > MAX_SAFE_INTEGER) throw $TypeError('Maximum allowed index exceeded');
  return it;
};


code:
'use strict';
module.exports = {
  IndexSizeError: { s: 'INDEX_SIZE_ERR', c: 1, m: 1 },
  DOMStringSizeError: { s: 'DOMSTRING_SIZE_ERR', c: 2, m: 0 },
  HierarchyRequestError: { s: 'HIERARCHY_REQUEST_ERR', c: 3, m: 1 },
  WrongDocumentError: { s: 'WRONG_DOCUMENT_ERR', c: 4, m: 1 },
  InvalidCharacterError: { s: 'INVALID_CHARACTER_ERR', c: 5, m: 1 },
  NoDataAllowedError: { s: 'NO_DATA_ALLOWED_ERR', c: 6, m: 0 },
  NoModificationAllowedError: { s: 'NO_MODIFICATION_ALLOWED_ERR', c: 7, m: 1 },
  NotFoundError: { s: 'NOT_FOUND_ERR', c: 8, m: 1 },
  NotSupportedError: { s: 'NOT_SUPPORTED_ERR', c: 9, m: 1 },
  InUseAttributeError: { s: 'INUSE_ATTRIBUTE_ERR', c: 10, m: 1 },
  InvalidStateError: { s: 'INVALID_STATE_ERR', c: 11, m: 1 },
  SyntaxError: { s: 'SYNTAX_ERR', c: 12, m: 1 },
  InvalidModificationError: { s: 'INVALID_MODIFICATION_ERR', c: 13, m: 1 },
  NamespaceError: { s: 'NAMESPACE_ERR', c: 14, m: 1 },
  InvalidAccessError: { s: 'INVALID_ACCESS_ERR', c: 15, m: 1 },
  ValidationError: { s: 'VALIDATION_ERR', c: 16, m: 0 },
  TypeMismatchError: { s: 'TYPE_MISMATCH_ERR', c: 17, m: 1 },
  SecurityError: { s: 'SECURITY_ERR', c: 18, m: 1 },
  NetworkError: { s: 'NETWORK_ERR', c: 19, m: 1 },
  AbortError: { s: 'ABORT_ERR', c: 20, m: 1 },
  URLMismatchError: { s: 'URL_MISMATCH_ERR', c: 21, m: 1 },
  QuotaExceededError: { s: 'QUOTA_EXCEEDED_ERR', c: 22, m: 1 },
  TimeoutError: { s: 'TIMEOUT_ERR', c: 23, m: 1 },
  InvalidNodeTypeError: { s: 'INVALID_NODE_TYPE_ERR', c: 24, m: 1 },
  DataCloneError: { s: 'DATA_CLONE_ERR', c: 25, m: 1 }
};


code:
'use strict';
// iterable DOM collections
// flag - `iterable` interface - 'entries', 'keys', 'values', 'forEach' methods
module.exports = {
  CSSRuleList: 0,
  CSSStyleDeclaration: 0,
  CSSValueList: 0,
  ClientRectList: 0,
  DOMRectList: 0,
  DOMStringList: 0,
  DOMTokenList: 1,
  DataTransferItemList: 0,
  FileList: 0,
  HTMLAllCollection: 0,
  HTMLCollection: 0,
  HTMLFormElement: 0,
  HTMLSelectElement: 0,
  MediaList: 0,
  MimeTypeArray: 0,
  NamedNodeMap: 0,
  NodeList: 1,
  PaintRequestList: 0,
  Plugin: 0,
  PluginArray: 0,
  SVGLengthList: 0,
  SVGNumberList: 0,
  SVGPathSegList: 0,
  SVGPointList: 0,
  SVGStringList: 0,
  SVGTransformList: 0,
  SourceBufferList: 0,
  StyleSheetList: 0,
  TextTrackCueList: 0,
  TextTrackList: 0,
  TouchList: 0
};


code:
'use strict';
// in old WebKit versions, `element.classList` is not an instance of global `DOMTokenList`
var documentCreateElement = require('../internals/document-create-element');

var classList = documentCreateElement('span').classList;
var DOMTokenListPrototype = classList && classList.constructor && classList.constructor.prototype;

module.exports = DOMTokenListPrototype === Object.prototype ? undefined : DOMTokenListPrototype;


code:
'use strict';
var globalThis = require('../internals/global-this');
var uncurryThis = require('../internals/function-uncurry-this');

module.exports = function (CONSTRUCTOR, METHOD) {
  return uncurryThis(globalThis[CONSTRUCTOR].prototype[METHOD]);
};


code:
'use strict';
var globalThis = require('../internals/global-this');

module.exports = function (CONSTRUCTOR) {
  return globalThis[CONSTRUCTOR].prototype;
};


code:
'use strict';
// IE8- don't enum bug keys
module.exports = [
  'constructor',
  'hasOwnProperty',
  'isPrototypeOf',
  'propertyIsEnumerable',
  'toLocaleString',
  'toString',
  'valueOf'
];


code:
'use strict';
var userAgent = require('../internals/environment-user-agent');

var firefox = userAgent.match(/firefox\/(\d+)/i);

module.exports = !!firefox && +firefox[1];


code:
'use strict';
var UA = require('../internals/environment-user-agent');

module.exports = /MSIE|Trident/.test(UA);


code:
'use strict';
var userAgent = require('../internals/environment-user-agent');

module.exports = /ipad|iphone|ipod/i.test(userAgent) && typeof Pebble != 'undefined';


code:
'use strict';
var userAgent = require('../internals/environment-user-agent');

// eslint-disable-next-line redos/no-vulnerable -- safe
module.exports = /(?:ipad|iphone|ipod).*applewebkit/i.test(userAgent);


code:
'use strict';
var ENVIRONMENT = require('../internals/environment');

module.exports = ENVIRONMENT === 'NODE';


code:
'use strict';
var userAgent = require('../internals/environment-user-agent');

module.exports = /web0s(?!.*chrome)/i.test(userAgent);


code:
'use strict';
var globalThis = require('../internals/global-this');

var navigator = globalThis.navigator;
var userAgent = navigator && navigator.userAgent;

module.exports = userAgent ? String(userAgent) : '';


code:
'use strict';
var globalThis = require('../internals/global-this');
var userAgent = require('../internals/environment-user-agent');

var process = globalThis.process;
var Deno = globalThis.Deno;
var versions = process && process.versions || Deno && Deno.version;
var v8 = versions && versions.v8;
var match, version;

if (v8) {
  match = v8.split('.');
  // in old Chrome, versions of V8 isn't V8 = Chrome / 10
  // but their correct versions are not interesting for us
  version = match[0] > 0 && match[0] < 4 ? 1 : +(match[0] + match[1]);
}

// BrowserFS NodeJS `process` polyfill incorrectly set `.v8` to `0.0`
// so check `userAgent` even if `.v8` exists, but 0
if (!version && userAgent) {
  match = userAgent.match(/Edge\/(\d+)/);
  if (!match || match[1] >= 74) {
    match = userAgent.match(/Chrome\/(\d+)/);
    if (match) version = +match[1];
  }
}

module.exports = version;


code:
'use strict';
var userAgent = require('../internals/environment-user-agent');

var webkit = userAgent.match(/AppleWebKit\/(\d+)\./);

module.exports = !!webkit && +webkit[1];


code:
'use strict';
/* global Bun, Deno -- detection */
var globalThis = require('../internals/global-this');
var userAgent = require('../internals/environment-user-agent');
var classof = require('../internals/classof-raw');

var userAgentStartsWith = function (string) {
  return userAgent.slice(0, string.length) === string;
};

module.exports = (function () {
  if (userAgentStartsWith('Bun/')) return 'BUN';
  if (userAgentStartsWith('Cloudflare-Workers')) return 'CLOUDFLARE';
  if (userAgentStartsWith('Deno/')) return 'DENO';
  if (userAgentStartsWith('Node.js/')) return 'NODE';
  if (globalThis.Bun && typeof Bun.version == 'string') return 'BUN';
  if (globalThis.Deno && typeof Deno.version == 'object') return 'DENO';
  if (classof(globalThis.process) === 'process') return 'NODE';
  if (globalThis.window && globalThis.document) return 'BROWSER';
  return 'REST';
})();


code:
'use strict';
var uncurryThis = require('../internals/function-uncurry-this');

var $Error = Error;
var replace = uncurryThis(''.replace);

var TEST = (function (arg) { return String(new $Error(arg).stack); })('zxcasd');
// eslint-disable-next-line redos/no-vulnerable, sonarjs/slow-regex -- safe
var V8_OR_CHAKRA_STACK_ENTRY = /\n\s*at [^:]*:[^\n]*/;
var IS_V8_OR_CHAKRA_STACK = V8_OR_CHAKRA_STACK_ENTRY.test(TEST);

module.exports = function (stack, dropEntries) {
  if (IS_V8_OR_CHAKRA_STACK && typeof stack == 'string' && !$Error.prepareStackTrace) {
    while (dropEntries--) stack = replace(stack, V8_OR_CHAKRA_STACK_ENTRY, '');
  } return stack;
};


code:
'use strict';
var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
var clearErrorStack = require('../internals/error-stack-clear');
var ERROR_STACK_INSTALLABLE = require('../internals/error-stack-installable');

// non-standard V8
var captureStackTrace = Error.captureStackTrace;

module.exports = function (error, C, stack, dropEntries) {
  if (ERROR_STACK_INSTALLABLE) {
    if (captureStackTrace) captureStackTrace(error, C);
    else createNonEnumerableProperty(error, 'stack', clearErrorStack(stack, dropEntries));
  }
};


code:
'use strict';
var fails = require('../internals/fails');
var createPropertyDescriptor = require('../internals/create-property-descriptor');

module.exports = !fails(function () {
  var error = new Error('a');
  if (!('stack' in error)) return true;
  // eslint-disable-next-line es/no-object-defineproperty -- safe
  Object.defineProperty(error, 'stack', createPropertyDescriptor(1, 7));
  return error.stack !== 7;
});


code:
'use strict';
var DESCRIPTORS = require('../internals/descriptors');
var fails = require('../internals/fails');
var anObject = require('../internals/an-object');
var normalizeStringArgument = require('../internals/normalize-string-argument');

var nativeErrorToString = Error.prototype.toString;

var INCORRECT_TO_STRING = fails(function () {
  if (DESCRIPTORS) {
    // Chrome 32- incorrectly call accessor
    // eslint-disable-next-line es/no-object-create, es/no-object-defineproperty -- safe
    var object = Object.create(Object.defineProperty({}, 'name', { get: function () {
      return this === object;
    } }));
    if (nativeErrorToString.call(object) !== 'true') return true;
  }
  // FF10- does not properly handle non-strings
  return nativeErrorToString.call({ message: 1, name: 2 }) !== '2: 1'
    // IE8 does not properly handle defaults
    || nativeErrorToString.call({}) !== 'Error';
});

module.exports = INCORRECT_TO_STRING ? function toString() {
  var O = anObject(this);
  var name = normalizeStringArgument(O.name, 'Error');
  var message = normalizeStringArgument(O.message);
  return !name ? message : !message ? name : name + ': ' + message;
} : nativeErrorToString;


code:
'use strict';
var globalThis = require('../internals/global-this');
var getOwnPropertyDescriptor = require('../internals/object-get-own-property-descriptor').f;
var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
var defineBuiltIn = require('../internals/define-built-in');
var defineGlobalProperty = require('../internals/define-global-property');
var copyConstructorProperties = require('../internals/copy-constructor-properties');
var isForced = require('../internals/is-forced');

/*
  options.target         - name of the target object
  options.global         - target is the global object
  options.stat           - export as static methods of target
  options.proto          - export as prototype methods of target
  options.real           - real prototype method for the `pure` version
  options.forced         - export even if the native feature is available
  options.bind           - bind methods to the target, required for the `pure` version
  options.wrap           - wrap constructors to preventing global pollution, required for the `pure` version
  options.unsafe         - use the simple assignment of property instead of delete + defineProperty
  options.sham           - add a flag to not completely full polyfills
  options.enumerable     - export as enumerable property
  options.dontCallGetSet - prevent calling a getter on target
  options.name           - the .name of the function if it does not match the key
*/
module.exports = function (options, source) {
  var TARGET = options.target;
  var GLOBAL = options.global;
  var STATIC = options.stat;
  var FORCED, target, key, targetProperty, sourceProperty, descriptor;
  if (GLOBAL) {
    target = globalThis;
  } else if (STATIC) {
    target = globalThis[TARGET] || defineGlobalProperty(TARGET, {});
  } else {
    target = globalThis[TARGET] && globalThis[TARGET].prototype;
  }
  if (target) for (key in source) {
    sourceProperty = source[key];
    if (options.dontCallGetSet) {
      descriptor = getOwnPropertyDescriptor(target, key);
      targetProperty = descriptor && descriptor.value;
    } else targetProperty = target[key];
    FORCED = isForced(GLOBAL ? key : TARGET + (STATIC ? '.' : '#') + key, options.forced);
    // contained in target
    if (!FORCED && targetProperty !== undefined) {
      if (typeof sourceProperty == typeof targetProperty) continue;
      copyConstructorProperties(sourceProperty, targetProperty);
    }
    // add a flag to not completely full polyfills
    if (options.sham || (targetProperty && targetProperty.sham)) {
      createNonEnumerableProperty(sourceProperty, 'sham', true);
    }
    defineBuiltIn(target, key, sourceProperty, options);
  }
};


code:
'use strict';
module.exports = function (exec) {
  try {
    return !!exec();
  } catch (error) {
    return true;
  }
};


code:
'use strict';
// TODO: Remove from `core-js@4` since it's moved to entry points
require('../modules/es.regexp.exec');
var call = require('../internals/function-call');
var defineBuiltIn = require('../internals/define-built-in');
var regexpExec = require('../internals/regexp-exec');
var fails = require('../internals/fails');
var wellKnownSymbol = require('../internals/well-known-symbol');
var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');

var SPECIES = wellKnownSymbol('species');
var RegExpPrototype = RegExp.prototype;

module.exports = function (KEY, exec, FORCED, SHAM) {
  var SYMBOL = wellKnownSymbol(KEY);

  var DELEGATES_TO_SYMBOL = !fails(function () {
    // String methods call symbol-named RegExp methods
    var O = {};
    O[SYMBOL] = function () { return 7; };
    return ''[KEY](O) !== 7;
  });

  var DELEGATES_TO_EXEC = DELEGATES_TO_SYMBOL && !fails(function () {
    // Symbol-named RegExp methods call .exec
    var execCalled = false;
    var re = /a/;

    if (KEY === 'split') {
      // We can't use real regex here since it causes deoptimization
      // and serious performance degradation in V8
      // https://github.com/zloirock/core-js/issues/306
      re = {};
      // RegExp[@@split] doesn't call the regex's exec method, but first creates
      // a new one. We need to return the patched regex when creating the new one.
      re.constructor = {};
      re.constructor[SPECIES] = function () { return re; };
      re.flags = '';
      re[SYMBOL] = /./[SYMBOL];
    }

    re.exec = function () {
      execCalled = true;
      return null;
    };

    re[SYMBOL]('');
    return !execCalled;
  });

  if (
    !DELEGATES_TO_SYMBOL ||
    !DELEGATES_TO_EXEC ||
    FORCED
  ) {
    var nativeRegExpMethod = /./[SYMBOL];
    var methods = exec(SYMBOL, ''[KEY], function (nativeMethod, regexp, str, arg2, forceStringMethod) {
      var $exec = regexp.exec;
      if ($exec === regexpExec || $exec === RegExpPrototype.exec) {
        if (DELEGATES_TO_SYMBOL && !forceStringMethod) {
          // The native String method already delegates to @@method (this
          // polyfilled function), leasing to infinite recursion.
          // We avoid it by directly calling the native @@method method.
          return { done: true, value: call(nativeRegExpMethod, regexp, str, arg2) };
        }
        return { done: true, value: call(nativeMethod, str, regexp, arg2) };
      }
      return { done: false };
    });

    defineBuiltIn(String.prototype, KEY, methods[0]);
    defineBuiltIn(RegExpPrototype, SYMBOL, methods[1]);
  }

  if (SHAM) createNonEnumerableProperty(RegExpPrototype[SYMBOL], 'sham', true);
};


code:
'use strict';
var isArray = require('../internals/is-array');
var lengthOfArrayLike = require('../internals/length-of-array-like');
var doesNotExceedSafeInteger = require('../internals/does-not-exceed-safe-integer');
var bind = require('../internals/function-bind-context');

// `FlattenIntoArray` abstract operation
// https://tc39.github.io/proposal-flatMap/#sec-FlattenIntoArray
var flattenIntoArray = function (target, original, source, sourceLen, start, depth, mapper, thisArg) {
  var targetIndex = start;
  var sourceIndex = 0;
  var mapFn = mapper ? bind(mapper, thisArg) : false;
  var element, elementLen;

  while (sourceIndex < sourceLen) {
    if (sourceIndex in source) {
      element = mapFn ? mapFn(source[sourceIndex], sourceIndex, original) : source[sourceIndex];

      if (depth > 0 && isArray(element)) {
        elementLen = lengthOfArrayLike(element);
        targetIndex = flattenIntoArray(target, original, element, elementLen, targetIndex, depth - 1) - 1;
      } else {
        doesNotExceedSafeInteger(targetIndex + 1);
        target[targetIndex] = element;
      }

      targetIndex++;
    }
    sourceIndex++;
  }
  return targetIndex;
};

module.exports = flattenIntoArray;


code:
'use strict';
var fails = require('../internals/fails');

module.exports = !fails(function () {
  // eslint-disable-next-line es/no-object-isextensible, es/no-object-preventextensions -- required for testing
  return Object.isExtensible(Object.preventExtensions({}));
});


code:
'use strict';
var NATIVE_BIND = require('../internals/function-bind-native');

var FunctionPrototype = Function.prototype;
var apply = FunctionPrototype.apply;
var call = FunctionPrototype.call;

// eslint-disable-next-line es/no-reflect -- safe
module.exports = typeof Reflect == 'object' && Reflect.apply || (NATIVE_BIND ? call.bind(apply) : function () {
  return call.apply(apply, arguments);
});


code:
'use strict';
var uncurryThis = require('../internals/function-uncurry-this-clause');
var aCallable = require('../internals/a-callable');
var NATIVE_BIND = require('../internals/function-bind-native');

var bind = uncurryThis(uncurryThis.bind);

// optional / simple context binding
module.exports = function (fn, that) {
  aCallable(fn);
  return that === undefined ? fn : NATIVE_BIND ? bind(fn, that) : function (/* ...args */) {
    return fn.apply(that, arguments);
  };
};


code:
'use strict';
var fails = require('../internals/fails');

module.exports = !fails(function () {
  // eslint-disable-next-line es/no-function-prototype-bind -- safe
  var test = (function () { /* empty */ }).bind();
  // eslint-disable-next-line no-prototype-builtins -- safe
  return typeof test != 'function' || test.hasOwnProperty('prototype');
});


code:
'use strict';
var uncurryThis = require('../internals/function-uncurry-this');
var aCallable = require('../internals/a-callable');
var isObject = require('../internals/is-object');
var hasOwn = require('../internals/has-own-property');
var arraySlice = require('../internals/array-slice');
var NATIVE_BIND = require('../internals/function-bind-native');

var $Function = Function;
var concat = uncurryThis([].concat);
var join = uncurryThis([].join);
var factories = {};

var construct = function (C, argsLength, args) {
  if (!hasOwn(factories, argsLength)) {
    var list = [];
    var i = 0;
    for (; i < argsLength; i++) list[i] = 'a[' + i + ']';
    factories[argsLength] = $Function('C,a', 'return new C(' + join(list, ',') + ')');
  } return factories[argsLength](C, args);
};

// `Function.prototype.bind` method implementation
// https://tc39.es/ecma262/#sec-function.prototype.bind
// eslint-disable-next-line es/no-function-prototype-bind -- detection
module.exports = NATIVE_BIND ? $Function.bind : function bind(that /* , ...args */) {
  var F = aCallable(this);
  var Prototype = F.prototype;
  var partArgs = arraySlice(arguments, 1);
  var boundFunction = function bound(/* args... */) {
    var args = concat(partArgs, arraySlice(arguments));
    return this instanceof boundFunction ? construct(F, args.length, args) : F.apply(that, args);
  };
  if (isObject(Prototype)) boundFunction.prototype = Prototype;
  return boundFunction;
};


code:
'use strict';
var NATIVE_BIND = require('../internals/function-bind-native');

var call = Function.prototype.call;

module.exports = NATIVE_BIND ? call.bind(call) : function () {
  return call.apply(call, arguments);
};


code:
'use strict';
var uncurryThis = require('../internals/function-uncurry-this');
var aCallable = require('../internals/a-callable');

module.exports = function demethodize() {
  return uncurryThis(aCallable(this));
};


code:
'use strict';
var DESCRIPTORS = require('../internals/descriptors');
var hasOwn = require('../internals/has-own-property');

var FunctionPrototype = Function.prototype;
// eslint-disable-next-line es/no-object-getownpropertydescriptor -- safe
var getDescriptor = DESCRIPTORS && Object.getOwnPropertyDescriptor;

var EXISTS = hasOwn(FunctionPrototype, 'name');
// additional protection from minified / mangled / dropped function names
var PROPER = EXISTS && (function something() { /* empty */ }).name === 'something';
var CONFIGURABLE = EXISTS && (!DESCRIPTORS || (DESCRIPTORS && getDescriptor(FunctionPrototype, 'name').configurable));

module.exports = {
  EXISTS: EXISTS,
  PROPER: PROPER,
  CONFIGURABLE: CONFIGURABLE
};


code:
'use strict';
var uncurryThis = require('../internals/function-uncurry-this');
var aCallable = require('../internals/a-callable');

module.exports = function (object, key, method) {
  try {
    // eslint-disable-next-line es/no-object-getownpropertydescriptor -- safe
    return uncurryThis(aCallable(Object.getOwnPropertyDescriptor(object, key)[method]));
  } catch (error) { /* empty */ }
};


code:
'use strict';
var classofRaw = require('../internals/classof-raw');
var uncurryThis = require('../internals/function-uncurry-this');

module.exports = function (fn) {
  // Nashorn bug:
  //   https://github.com/zloirock/core-js/issues/1128
  //   https://github.com/zloirock/core-js/issues/1130
  if (classofRaw(fn) === 'Function') return uncurryThis(fn);
};


code:
'use strict';
var NATIVE_BIND = require('../internals/function-bind-native');

var FunctionPrototype = Function.prototype;
var call = FunctionPrototype.call;
var uncurryThisWithBind = NATIVE_BIND && FunctionPrototype.bind.bind(call, call);

module.exports = NATIVE_BIND ? uncurryThisWithBind : function (fn) {
  return function () {
    return call.apply(fn, arguments);
  };
};


code:
'use strict';
var $TypeError = TypeError;

module.exports = function (options) {
  var alphabet = options && options.alphabet;
  if (alphabet === undefined || alphabet === 'base64' || alphabet === 'base64url') return alphabet || 'base64';
  throw new $TypeError('Incorrect `alphabet` option');
};


code:
'use strict';
var call = require('../internals/function-call');
var isCallable = require('../internals/is-callable');
var anObject = require('../internals/an-object');
var getIteratorDirect = require('../internals/get-iterator-direct');
var getIteratorMethod = require('../internals/get-iterator-method');
var getMethod = require('../internals/get-method');
var wellKnownSymbol = require('../internals/well-known-symbol');
var AsyncFromSyncIterator = require('../internals/async-from-sync-iterator');

var ASYNC_ITERATOR = wellKnownSymbol('asyncIterator');

module.exports = function (obj) {
  var object = anObject(obj);
  var alreadyAsync = true;
  var method = getMethod(object, ASYNC_ITERATOR);
  var iterator;
  if (!isCallable(method)) {
    method = getIteratorMethod(object);
    alreadyAsync = false;
  }
  if (method !== undefined) {
    iterator = call(method, object);
  } else {
    iterator = object;
    alreadyAsync = true;
  }
  anObject(iterator);
  return getIteratorDirect(alreadyAsync ? iterator : new AsyncFromSyncIterator(getIteratorDirect(iterator)));
};


code:
'use strict';
var call = require('../internals/function-call');
var AsyncFromSyncIterator = require('../internals/async-from-sync-iterator');
var anObject = require('../internals/an-object');
var getIterator = require('../internals/get-iterator');
var getIteratorDirect = require('../internals/get-iterator-direct');
var getMethod = require('../internals/get-method');
var wellKnownSymbol = require('../internals/well-known-symbol');

var ASYNC_ITERATOR = wellKnownSymbol('asyncIterator');

module.exports = function (it, usingIterator) {
  var method = arguments.length < 2 ? getMethod(it, ASYNC_ITERATOR) : usingIterator;
  return method ? anObject(call(method, it)) : new AsyncFromSyncIterator(getIteratorDirect(getIterator(it)));
};


code:
'use strict';
var globalThis = require('../internals/global-this');
var IS_NODE = require('../internals/environment-is-node');

module.exports = function (name) {
  if (IS_NODE) {
    try {
      return globalThis.process.getBuiltinModule(name);
    } catch (error) { /* empty */ }
    try {
      // eslint-disable-next-line no-new-func -- safe
      return Function('return require("' + name + '")')();
    } catch (error) { /* empty */ }
  }
};


code:
'use strict';
var globalThis = require('../internals/global-this');

module.exports = function (CONSTRUCTOR, METHOD) {
  var Constructor = globalThis[CONSTRUCTOR];
  var Prototype = Constructor && Constructor.prototype;
  return Prototype && Prototype[METHOD];
};


code:
'use strict';
var globalThis = require('../internals/global-this');
var isCallable = require('../internals/is-callable');

var aFunction = function (argument) {
  return isCallable(argument) ? argument : undefined;
};

module.exports = function (namespace, method) {
  return arguments.length < 2 ? aFunction(globalThis[namespace]) : globalThis[namespace] && globalThis[namespace][method];
};


code:
'use strict';
// `GetIteratorDirect(obj)` abstract operation
// https://tc39.es/proposal-iterator-helpers/#sec-getiteratordirect
module.exports = function (obj) {
  return {
    iterator: obj,
    next: obj.next,
    done: false
  };
};


code:
'use strict';
var call = require('../internals/function-call');
var anObject = require('../internals/an-object');
var getIteratorDirect = require('../internals/get-iterator-direct');
var getIteratorMethod = require('../internals/get-iterator-method');

module.exports = function (obj, stringHandling) {
  if (!stringHandling || typeof obj !== 'string') anObject(obj);
  var method = getIteratorMethod(obj);
  return getIteratorDirect(anObject(method !== undefined ? call(method, obj) : obj));
};


code:
'use strict';
var classof = require('../internals/classof');
var getMethod = require('../internals/get-method');
var isNullOrUndefined = require('../internals/is-null-or-undefined');
var Iterators = require('../internals/iterators');
var wellKnownSymbol = require('../internals/well-known-symbol');

var ITERATOR = wellKnownSymbol('iterator');

module.exports = function (it) {
  if (!isNullOrUndefined(it)) return getMethod(it, ITERATOR)
    || getMethod(it, '@@iterator')
    || Iterators[classof(it)];
};


code:
'use strict';
var call = require('../internals/function-call');
var aCallable = require('../internals/a-callable');
var anObject = require('../internals/an-object');
var tryToString = require('../internals/try-to-string');
var getIteratorMethod = require('../internals/get-iterator-method');

var $TypeError = TypeError;

module.exports = function (argument, usingIterator) {
  var iteratorMethod = arguments.length < 2 ? getIteratorMethod(argument) : usingIterator;
  if (aCallable(iteratorMethod)) return anObject(call(iteratorMethod, argument));
  throw new $TypeError(tryToString(argument) + ' is not iterable');
};


code:
'use strict';
var uncurryThis = require('../internals/function-uncurry-this');
var isArray = require('../internals/is-array');
var isCallable = require('../internals/is-callable');
var classof = require('../internals/classof-raw');
var toString = require('../internals/to-string');

var push = uncurryThis([].push);

module.exports = function (replacer) {
  if (isCallable(replacer)) return replacer;
  if (!isArray(replacer)) return;
  var rawLength = replacer.length;
  var keys = [];
  for (var i = 0; i < rawLength; i++) {
    var element = replacer[i];
    if (typeof element == 'string') push(keys, element);
    else if (typeof element == 'number' || classof(element) === 'Number' || classof(element) === 'String') push(keys, toString(element));
  }
  var keysLength = keys.length;
  var root = true;
  return function (key, value) {
    if (root) {
      root = false;
      return value;
    }
    if (isArray(this)) return value;
    for (var j = 0; j < keysLength; j++) if (keys[j] === key) return value;
  };
};


code:
'use strict';
var aCallable = require('../internals/a-callable');
var isNullOrUndefined = require('../internals/is-null-or-undefined');

// `GetMethod` abstract operation
// https://tc39.es/ecma262/#sec-getmethod
module.exports = function (V, P) {
  var func = V[P];
  return isNullOrUndefined(func) ? undefined : aCallable(func);
};


code:
'use strict';
var aCallable = require('../internals/a-callable');
var anObject = require('../internals/an-object');
var call = require('../internals/function-call');
var toIntegerOrInfinity = require('../internals/to-integer-or-infinity');
var getIteratorDirect = require('../internals/get-iterator-direct');

var INVALID_SIZE = 'Invalid size';
var $RangeError = RangeError;
var $TypeError = TypeError;
var max = Math.max;

var SetRecord = function (set, intSize) {
  this.set = set;
  this.size = max(intSize, 0);
  this.has = aCallable(set.has);
  this.keys = aCallable(set.keys);
};

SetRecord.prototype = {
  getIterator: function () {
    return getIteratorDirect(anObject(call(this.keys, this.set)));
  },
  includes: function (it) {
    return call(this.has, this.set, it);
  }
};

// `GetSetRecord` abstract operation
// https://tc39.es/proposal-set-methods/#sec-getsetrecord
module.exports = function (obj) {
  anObject(obj);
  var numSize = +obj.size;
  // NOTE: If size is undefined, then numSize will be NaN
  // eslint-disable-next-line no-self-compare -- NaN check
  if (numSize !== numSize) throw new $TypeError(INVALID_SIZE);
  var intSize = toIntegerOrInfinity(numSize);
  if (intSize < 0) throw new $RangeError(INVALID_SIZE);
  return new SetRecord(obj, intSize);
};


code:
'use strict';
var uncurryThis = require('../internals/function-uncurry-this');
var toObject = require('../internals/to-object');

var floor = Math.floor;
var charAt = uncurryThis(''.charAt);
var replace = uncurryThis(''.replace);
var stringSlice = uncurryThis(''.slice);
// eslint-disable-next-line redos/no-vulnerable -- safe
var SUBSTITUTION_SYMBOLS = /\$([$&'`]|\d{1,2}|<[^>]*>)/g;
var SUBSTITUTION_SYMBOLS_NO_NAMED = /\$([$&'`]|\d{1,2})/g;

// `GetSubstitution` abstract operation
// https://tc39.es/ecma262/#sec-getsubstitution
module.exports = function (matched, str, position, captures, namedCaptures, replacement) {
  var tailPos = position + matched.length;
  var m = captures.length;
  var symbols = SUBSTITUTION_SYMBOLS_NO_NAMED;
  if (namedCaptures !== undefined) {
    namedCaptures = toObject(namedCaptures);
    symbols = SUBSTITUTION_SYMBOLS;
  }
  return replace(replacement, symbols, function (match, ch) {
    var capture;
    switch (charAt(ch, 0)) {
      case '$': return '$';
      case '&': return matched;
      case '`': return stringSlice(str, 0, position);
      case "'": return stringSlice(str, tailPos);
      case '<':
        capture = namedCaptures[stringSlice(ch, 1, -1)];
        break;
      default: // \d\d?
        var n = +ch;
        if (n === 0) return match;
        if (n > m) {
          var f = floor(n / 10);
          if (f === 0) return match;
          if (f <= m) return captures[f - 1] === undefined ? charAt(ch, 1) : captures[f - 1] + charAt(ch, 1);
          return match;
        }
        capture = captures[n - 1];
    }
    return capture === undefined ? '' : capture;
  });
};


code:
'use strict';
var check = function (it) {
  return it && it.Math === Math && it;
};

// https://github.com/zloirock/core-js/issues/86#issuecomment-115759028
module.exports =
  // eslint-disable-next-line es/no-global-this -- safe
  check(typeof globalThis == 'object' && globalThis) ||
  check(typeof window == 'object' && window) ||
  // eslint-disable-next-line no-restricted-globals -- safe
  check(typeof self == 'object' && self) ||
  check(typeof global == 'object' && global) ||
  check(typeof this == 'object' && this) ||
  // eslint-disable-next-line no-new-func -- fallback
  (function () { return this; })() || Function('return this')();


code:
'use strict';
var uncurryThis = require('../internals/function-uncurry-this');
var toObject = require('../internals/to-object');

var hasOwnProperty = uncurryThis({}.hasOwnProperty);

// `HasOwnProperty` abstract operation
// https://tc39.es/ecma262/#sec-hasownproperty
// eslint-disable-next-line es/no-object-hasown -- safe
module.exports = Object.hasOwn || function hasOwn(it, key) {
  return hasOwnProperty(toObject(it), key);
};


code:
'use strict';
module.exports = function (a, b) {
  try {
    // eslint-disable-next-line no-console -- safe
    arguments.length === 1 ? console.error(a) : console.error(a, b);
  } catch (error) { /* empty */ }
};


code:
'use strict';
var getBuiltIn = require('../internals/get-built-in');

module.exports = getBuiltIn('document', 'documentElement');


code:
'use strict';
var DESCRIPTORS = require('../internals/descriptors');
var fails = require('../internals/fails');
var createElement = require('../internals/document-create-element');

// Thanks to IE8 for its funny defineProperty
module.exports = !DESCRIPTORS && !fails(function () {
  // eslint-disable-next-line es/no-object-defineproperty -- required for testing
  return Object.defineProperty(createElement('div'), 'a', {
    get: function () { return 7; }
  }).a !== 7;
});


code:
'use strict';
// IEEE754 conversions based on https://github.com/feross/ieee754
var $Array = Array;
var abs = Math.abs;
var pow = Math.pow;
var floor = Math.floor;
var log = Math.log;
var LN2 = Math.LN2;

var pack = function (number, mantissaLength, bytes) {
  var buffer = $Array(bytes);
  var exponentLength = bytes * 8 - mantissaLength - 1;
  var eMax = (1 << exponentLength) - 1;
  var eBias = eMax >> 1;
  var rt = mantissaLength === 23 ? pow(2, -24) - pow(2, -77) : 0;
  var sign = number < 0 || number === 0 && 1 / number < 0 ? 1 : 0;
  var index = 0;
  var exponent, mantissa, c;
  number = abs(number);
  // eslint-disable-next-line no-self-compare -- NaN check
  if (number !== number || number === Infinity) {
    // eslint-disable-next-line no-self-compare -- NaN check
    mantissa = number !== number ? 1 : 0;
    exponent = eMax;
  } else {
    exponent = floor(log(number) / LN2);
    c = pow(2, -exponent);
    if (number * c < 1) {
      exponent--;
      c *= 2;
    }
    if (exponent + eBias >= 1) {
      number += rt / c;
    } else {
      number += rt * pow(2, 1 - eBias);
    }
    if (number * c >= 2) {
      exponent++;
      c /= 2;
    }
    if (exponent + eBias >= eMax) {
      mantissa = 0;
      exponent = eMax;
    } else if (exponent + eBias >= 1) {
      mantissa = (number * c - 1) * pow(2, mantissaLength);
      exponent += eBias;
    } else {
      mantissa = number * pow(2, eBias - 1) * pow(2, mantissaLength);
      exponent = 0;
    }
  }
  while (mantissaLength >= 8) {
    buffer[index++] = mantissa & 255;
    mantissa /= 256;
    mantissaLength -= 8;
  }
  exponent = exponent << mantissaLength | mantissa;
  exponentLength += mantissaLength;
  while (exponentLength > 0) {
    buffer[index++] = exponent & 255;
    exponent /= 256;
    exponentLength -= 8;
  }
  buffer[index - 1] |= sign * 128;
  return buffer;
};

var unpack = function (buffer, mantissaLength) {
  var bytes = buffer.length;
  var exponentLength = bytes * 8 - mantissaLength - 1;
  var eMax = (1 << exponentLength) - 1;
  var eBias = eMax >> 1;
  var nBits = exponentLength - 7;
  var index = bytes - 1;
  var sign = buffer[index--];
  var exponent = sign & 127;
  var mantissa;
  sign >>= 7;
  while (nBits > 0) {
    exponent = exponent * 256 + buffer[index--];
    nBits -= 8;
  }
  mantissa = exponent & (1 << -nBits) - 1;
  exponent >>= -nBits;
  nBits += mantissaLength;
  while (nBits > 0) {
    mantissa = mantissa * 256 + buffer[index--];
    nBits -= 8;
  }
  if (exponent === 0) {
    exponent = 1 - eBias;
  } else if (exponent === eMax) {
    return mantissa ? NaN : sign ? -Infinity : Infinity;
  } else {
    mantissa += pow(2, mantissaLength);
    exponent -= eBias;
  } return (sign ? -1 : 1) * mantissa * pow(2, exponent - mantissaLength);
};

module.exports = {
  pack: pack,
  unpack: unpack
};


code:
'use strict';
var uncurryThis = require('../internals/function-uncurry-this');
var fails = require('../internals/fails');
var classof = require('../internals/classof-raw');

var $Object = Object;
var split = uncurryThis(''.split);

// fallback for non-array-like ES3 and non-enumerable old V8 strings
module.exports = fails(function () {
  // throws an error in rhino, see https://github.com/mozilla/rhino/issues/346
  // eslint-disable-next-line no-prototype-builtins -- safe
  return !$Object('z').propertyIsEnumerable(0);
}) ? function (it) {
  return classof(it) === 'String' ? split(it, '') : $Object(it);
} : $Object;


code:
'use strict';
var isCallable = require('../internals/is-callable');
var isObject = require('../internals/is-object');
var setPrototypeOf = require('../internals/object-set-prototype-of');

// makes subclassing work correct for wrapped built-ins
module.exports = function ($this, dummy, Wrapper) {
  var NewTarget, NewTargetPrototype;
  if (
    // it can work only with native `setPrototypeOf`
    setPrototypeOf &&
    // we haven't completely correct pre-ES6 way for getting `new.target`, so use this
    isCallable(NewTarget = dummy.constructor) &&
    NewTarget !== Wrapper &&
    isObject(NewTargetPrototype = NewTarget.prototype) &&
    NewTargetPrototype !== Wrapper.prototype
  ) setPrototypeOf($this, NewTargetPrototype);
  return $this;
};


code:
'use strict';
var uncurryThis = require('../internals/function-uncurry-this');
var isCallable = require('../internals/is-callable');
var store = require('../internals/shared-store');

var functionToString = uncurryThis(Function.toString);

// this helper broken in `core-js@3.4.1-3.4.4`, so we can't use `shared` helper
if (!isCallable(store.inspectSource)) {
  store.inspectSource = function (it) {
    return functionToString(it);
  };
}

module.exports = store.inspectSource;


code:
'use strict';
var isObject = require('../internals/is-object');
var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');

// `InstallErrorCause` abstract operation
// https://tc39.es/proposal-error-cause/#sec-errorobjects-install-error-cause
module.exports = function (O, options) {
  if (isObject(options) && 'cause' in options) {
    createNonEnumerableProperty(O, 'cause', options.cause);
  }
};


code:
'use strict';
var $ = require('../internals/export');
var uncurryThis = require('../internals/function-uncurry-this');
var hiddenKeys = require('../internals/hidden-keys');
var isObject = require('../internals/is-object');
var hasOwn = require('../internals/has-own-property');
var defineProperty = require('../internals/object-define-property').f;
var getOwnPropertyNamesModule = require('../internals/object-get-own-property-names');
var getOwnPropertyNamesExternalModule = require('../internals/object-get-own-property-names-external');
var isExtensible = require('../internals/object-is-extensible');
var uid = require('../internals/uid');
var FREEZING = require('../internals/freezing');

var REQUIRED = false;
var METADATA = uid('meta');
var id = 0;

var setMetadata = function (it) {
  defineProperty(it, METADATA, { value: {
    objectID: 'O' + id++, // object ID
    weakData: {}          // weak collections IDs
  } });
};

var fastKey = function (it, create) {
  // return a primitive with prefix
  if (!isObject(it)) return typeof it == 'symbol' ? it : (typeof it == 'string' ? 'S' : 'P') + it;
  if (!hasOwn(it, METADATA)) {
    // can't set metadata to uncaught frozen object
    if (!isExtensible(it)) return 'F';
    // not necessary to add metadata
    if (!create) return 'E';
    // add missing metadata
    setMetadata(it);
  // return object ID
  } return it[METADATA].objectID;
};

var getWeakData = function (it, create) {
  if (!hasOwn(it, METADATA)) {
    // can't set metadata to uncaught frozen object
    if (!isExtensible(it)) return true;
    // not necessary to add metadata
    if (!create) return false;
    // add missing metadata
    setMetadata(it);
  // return the store of weak collections IDs
  } return it[METADATA].weakData;
};

// add metadata on freeze-family methods calling
var onFreeze = function (it) {
  if (FREEZING && REQUIRED && isExtensible(it) && !hasOwn(it, METADATA)) setMetadata(it);
  return it;
};

var enable = function () {
  meta.enable = function () { /* empty */ };
  REQUIRED = true;
  var getOwnPropertyNames = getOwnPropertyNamesModule.f;
  var splice = uncurryThis([].splice);
  var test = {};
  test[METADATA] = 1;

  // prevent exposing of metadata key
  if (getOwnPropertyNames(test).length) {
    getOwnPropertyNamesModule.f = function (it) {
      var result = getOwnPropertyNames(it);
      for (var i = 0, length = result.length; i < length; i++) {
        if (result[i] === METADATA) {
          splice(result, i, 1);
          break;
        }
      } return result;
    };

    $({ target: 'Object', stat: true, forced: true }, {
      getOwnPropertyNames: getOwnPropertyNamesExternalModule.f
    });
  }
};

var meta = module.exports = {
  enable: enable,
  fastKey: fastKey,
  getWeakData: getWeakData,
  onFreeze: onFreeze
};

hiddenKeys[METADATA] = true;


code:
'use strict';
var NATIVE_WEAK_MAP = require('../internals/weak-map-basic-detection');
var globalThis = require('../internals/global-this');
var isObject = require('../internals/is-object');
var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
var hasOwn = require('../internals/has-own-property');
var shared = require('../internals/shared-store');
var sharedKey = require('../internals/shared-key');
var hiddenKeys = require('../internals/hidden-keys');

var OBJECT_ALREADY_INITIALIZED = 'Object already initialized';
var TypeError = globalThis.TypeError;
var WeakMap = globalThis.WeakMap;
var set, get, has;

var enforce = function (it) {
  return has(it) ? get(it) : set(it, {});
};

var getterFor = function (TYPE) {
  return function (it) {
    var state;
    if (!isObject(it) || (state = get(it)).type !== TYPE) {
      throw new TypeError('Incompatible receiver, ' + TYPE + ' required');
    } return state;
  };
};

if (NATIVE_WEAK_MAP || shared.state) {
  var store = shared.state || (shared.state = new WeakMap());
  /* eslint-disable no-self-assign -- prototype methods protection */
  store.get = store.get;
  store.has = store.has;
  store.set = store.set;
  /* eslint-enable no-self-assign -- prototype methods protection */
  set = function (it, metadata) {
    if (store.has(it)) throw new TypeError(OBJECT_ALREADY_INITIALIZED);
    metadata.facade = it;
    store.set(it, metadata);
    return metadata;
  };
  get = function (it) {
    return store.get(it) || {};
  };
  has = function (it) {
    return store.has(it);
  };
} else {
  var STATE = sharedKey('state');
  hiddenKeys[STATE] = true;
  set = function (it, metadata) {
    if (hasOwn(it, STATE)) throw new TypeError(OBJECT_ALREADY_INITIALIZED);
    metadata.facade = it;
    createNonEnumerableProperty(it, STATE, metadata);
    return metadata;
  };
  get = function (it) {
    return hasOwn(it, STATE) ? it[STATE] : {};
  };
  has = function (it) {
    return hasOwn(it, STATE);
  };
}

module.exports = {
  set: set,
  get: get,
  has: has,
  enforce: enforce,
  getterFor: getterFor
};


code:
'use strict';
var wellKnownSymbol = require('../internals/well-known-symbol');
var Iterators = require('../internals/iterators');

var ITERATOR = wellKnownSymbol('iterator');
var ArrayPrototype = Array.prototype;

// check on default Array iterator
module.exports = function (it) {
  return it !== undefined && (Iterators.Array === it || ArrayPrototype[ITERATOR] === it);
};


code:
'use strict';
var classof = require('../internals/classof-raw');

// `IsArray` abstract operation
// https://tc39.es/ecma262/#sec-isarray
// eslint-disable-next-line es/no-array-isarray -- safe
module.exports = Array.isArray || function isArray(argument) {
  return classof(argument) === 'Array';
};


code:
'use strict';
var classof = require('../internals/classof');

module.exports = function (it) {
  var klass = classof(it);
  return klass === 'BigInt64Array' || klass === 'BigUint64Array';
};


code:
'use strict';
// https://tc39.es/ecma262/#sec-IsHTMLDDA-internal-slot
var documentAll = typeof document == 'object' && document.all;

// `IsCallable` abstract operation
// https://tc39.es/ecma262/#sec-iscallable
// eslint-disable-next-line unicorn/no-typeof-undefined -- required for testing
module.exports = typeof documentAll == 'undefined' && documentAll !== undefined ? function (argument) {
  return typeof argument == 'function' || argument === documentAll;
} : function (argument) {
  return typeof argument == 'function';
};


code:
'use strict';
var uncurryThis = require('../internals/function-uncurry-this');
var fails = require('../internals/fails');
var isCallable = require('../internals/is-callable');
var classof = require('../internals/classof');
var getBuiltIn = require('../internals/get-built-in');
var inspectSource = require('../internals/inspect-source');

var noop = function () { /* empty */ };
var construct = getBuiltIn('Reflect', 'construct');
var constructorRegExp = /^\s*(?:class|function)\b/;
var exec = uncurryThis(constructorRegExp.exec);
var INCORRECT_TO_STRING = !constructorRegExp.test(noop);

var isConstructorModern = function isConstructor(argument) {
  if (!isCallable(argument)) return false;
  try {
    construct(noop, [], argument);
    return true;
  } catch (error) {
    return false;
  }
};

var isConstructorLegacy = function isConstructor(argument) {
  if (!isCallable(argument)) return false;
  switch (classof(argument)) {
    case 'AsyncFunction':
    case 'GeneratorFunction':
    case 'AsyncGeneratorFunction': return false;
  }
  try {
    // we can't check .prototype since constructors produced by .bind haven't it
    // `Function#toString` throws on some built-it function in some legacy engines
    // (for example, `DOMQuad` and similar in FF41-)
    return INCORRECT_TO_STRING || !!exec(constructorRegExp, inspectSource(argument));
  } catch (error) {
    return true;
  }
};

isConstructorLegacy.sham = true;

// `IsConstructor` abstract operation
// https://tc39.es/ecma262/#sec-isconstructor
module.exports = !construct || fails(function () {
  var called;
  return isConstructorModern(isConstructorModern.call)
    || !isConstructorModern(Object)
    || !isConstructorModern(function () { called = true; })
    || called;
}) ? isConstructorLegacy : isConstructorModern;


code:
'use strict';
var hasOwn = require('../internals/has-own-property');

module.exports = function (descriptor) {
  return descriptor !== undefined && (hasOwn(descriptor, 'value') || hasOwn(descriptor, 'writable'));
};


code:
'use strict';
var fails = require('../internals/fails');
var isCallable = require('../internals/is-callable');

var replacement = /#|\.prototype\./;

var isForced = function (feature, detection) {
  var value = data[normalize(feature)];
  return value === POLYFILL ? true
    : value === NATIVE ? false
    : isCallable(detection) ? fails(detection)
    : !!detection;
};

var normalize = isForced.normalize = function (string) {
  return String(string).replace(replacement, '.').toLowerCase();
};

var data = isForced.data = {};
var NATIVE = isForced.NATIVE = 'N';
var POLYFILL = isForced.POLYFILL = 'P';

module.exports = isForced;


code:
'use strict';
var isObject = require('../internals/is-object');

var floor = Math.floor;

// `IsIntegralNumber` abstract operation
// https://tc39.es/ecma262/#sec-isintegralnumber
// eslint-disable-next-line es/no-number-isinteger -- safe
module.exports = Number.isInteger || function isInteger(it) {
  return !isObject(it) && isFinite(it) && floor(it) === it;
};


code:
'use strict';
var classof = require('../internals/classof');
var hasOwn = require('../internals/has-own-property');
var isNullOrUndefined = require('../internals/is-null-or-undefined');
var wellKnownSymbol = require('../internals/well-known-symbol');
var Iterators = require('../internals/iterators');

var ITERATOR = wellKnownSymbol('iterator');
var $Object = Object;

module.exports = function (it) {
  if (isNullOrUndefined(it)) return false;
  var O = $Object(it);
  return O[ITERATOR] !== undefined
    || '@@iterator' in O
    || hasOwn(Iterators, classof(O));
};


code:
'use strict';
// we can't use just `it == null` since of `document.all` special case
// https://tc39.es/ecma262/#sec-IsHTMLDDA-internal-slot-aec
module.exports = function (it) {
  return it === null || it === undefined;
};


code:
'use strict';
var isCallable = require('../internals/is-callable');

module.exports = function (it) {
  return typeof it == 'object' ? it !== null : isCallable(it);
};


code:
'use strict';
var isObject = require('../internals/is-object');

module.exports = function (argument) {
  return isObject(argument) || argument === null;
};


code:
'use strict';
module.exports = false;


code:
'use strict';
var isObject = require('../internals/is-object');
var getInternalState = require('../internals/internal-state').get;

module.exports = function isRawJSON(O) {
  if (!isObject(O)) return false;
  var state = getInternalState(O);
  return !!state && state.type === 'RawJSON';
};


code:
'use strict';
var isObject = require('../internals/is-object');
var classof = require('../internals/classof-raw');
var wellKnownSymbol = require('../internals/well-known-symbol');

var MATCH = wellKnownSymbol('match');

// `IsRegExp` abstract operation
// https://tc39.es/ecma262/#sec-isregexp
module.exports = function (it) {
  var isRegExp;
  return isObject(it) && ((isRegExp = it[MATCH]) !== undefined ? !!isRegExp : classof(it) === 'RegExp');
};


code:
'use strict';
var getBuiltIn = require('../internals/get-built-in');
var isCallable = require('../internals/is-callable');
var isPrototypeOf = require('../internals/object-is-prototype-of');
var USE_SYMBOL_AS_UID = require('../internals/use-symbol-as-uid');

var $Object = Object;

module.exports = USE_SYMBOL_AS_UID ? function (it) {
  return typeof it == 'symbol';
} : function (it) {
  var $Symbol = getBuiltIn('Symbol');
  return isCallable($Symbol) && isPrototypeOf($Symbol.prototype, $Object(it));
};


code:
'use strict';
var call = require('../internals/function-call');

module.exports = function (record, fn, ITERATOR_INSTEAD_OF_RECORD) {
  var iterator = ITERATOR_INSTEAD_OF_RECORD ? record : record.iterator;
  var next = record.next;
  var step, result;
  while (!(step = call(next, iterator)).done) {
    result = fn(step.value);
    if (result !== undefined) return result;
  }
};


code:
'use strict';
var bind = require('../internals/function-bind-context');
var call = require('../internals/function-call');
var anObject = require('../internals/an-object');
var tryToString = require('../internals/try-to-string');
var isArrayIteratorMethod = require('../internals/is-array-iterator-method');
var lengthOfArrayLike = require('../internals/length-of-array-like');
var isPrototypeOf = require('../internals/object-is-prototype-of');
var getIterator = require('../internals/get-iterator');
var getIteratorMethod = require('../internals/get-iterator-method');
var iteratorClose = require('../internals/iterator-close');

var $TypeError = TypeError;

var Result = function (stopped, result) {
  this.stopped = stopped;
  this.result = result;
};

var ResultPrototype = Result.prototype;

module.exports = function (iterable, unboundFunction, options) {
  var that = options && options.that;
  var AS_ENTRIES = !!(options && options.AS_ENTRIES);
  var IS_RECORD = !!(options && options.IS_RECORD);
  var IS_ITERATOR = !!(options && options.IS_ITERATOR);
  var INTERRUPTED = !!(options && options.INTERRUPTED);
  var fn = bind(unboundFunction, that);
  var iterator, iterFn, index, length, result, next, step;

  var stop = function (condition) {
    if (iterator) iteratorClose(iterator, 'normal', condition);
    return new Result(true, condition);
  };

  var callFn = function (value) {
    if (AS_ENTRIES) {
      anObject(value);
      return INTERRUPTED ? fn(value[0], value[1], stop) : fn(value[0], value[1]);
    } return INTERRUPTED ? fn(value, stop) : fn(value);
  };

  if (IS_RECORD) {
    iterator = iterable.iterator;
  } else if (IS_ITERATOR) {
    iterator = iterable;
  } else {
    iterFn = getIteratorMethod(iterable);
    if (!iterFn) throw new $TypeError(tryToString(iterable) + ' is not iterable');
    // optimisation for array iterators
    if (isArrayIteratorMethod(iterFn)) {
      for (index = 0, length = lengthOfArrayLike(iterable); length > index; index++) {
        result = callFn(iterable[index]);
        if (result && isPrototypeOf(ResultPrototype, result)) return result;
      } return new Result(false);
    }
    iterator = getIterator(iterable, iterFn);
  }

  next = IS_RECORD ? iterable.next : iterator.next;
  while (!(step = call(next, iterator)).done) {
    try {
      result = callFn(step.value);
    } catch (error) {
      iteratorClose(iterator, 'throw', error);
    }
    if (typeof result == 'object' && result && isPrototypeOf(ResultPrototype, result)) return result;
  } return new Result(false);
};


code:
'use strict';
var call = require('../internals/function-call');
var anObject = require('../internals/an-object');
var getMethod = require('../internals/get-method');

module.exports = function (iterator, kind, value) {
  var innerResult, innerError;
  anObject(iterator);
  try {
    innerResult = getMethod(iterator, 'return');
    if (!innerResult) {
      if (kind === 'throw') throw value;
      return value;
    }
    innerResult = call(innerResult, iterator);
  } catch (error) {
    innerError = true;
    innerResult = error;
  }
  if (kind === 'throw') throw value;
  if (innerError) throw innerResult;
  anObject(innerResult);
  return value;
};


code:
'use strict';
var IteratorPrototype = require('../internals/iterators-core').IteratorPrototype;
var create = require('../internals/object-create');
var createPropertyDescriptor = require('../internals/create-property-descriptor');
var setToStringTag = require('../internals/set-to-string-tag');
var Iterators = require('../internals/iterators');

var returnThis = function () { return this; };

module.exports = function (IteratorConstructor, NAME, next, ENUMERABLE_NEXT) {
  var TO_STRING_TAG = NAME + ' Iterator';
  IteratorConstructor.prototype = create(IteratorPrototype, { next: createPropertyDescriptor(+!ENUMERABLE_NEXT, next) });
  setToStringTag(IteratorConstructor, TO_STRING_TAG, false, true);
  Iterators[TO_STRING_TAG] = returnThis;
  return IteratorConstructor;
};


code:
'use strict';
var call = require('../internals/function-call');
var create = require('../internals/object-create');
var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
var defineBuiltIns = require('../internals/define-built-ins');
var wellKnownSymbol = require('../internals/well-known-symbol');
var InternalStateModule = require('../internals/internal-state');
var getMethod = require('../internals/get-method');
var IteratorPrototype = require('../internals/iterators-core').IteratorPrototype;
var createIterResultObject = require('../internals/create-iter-result-object');
var iteratorClose = require('../internals/iterator-close');

var TO_STRING_TAG = wellKnownSymbol('toStringTag');
var ITERATOR_HELPER = 'IteratorHelper';
var WRAP_FOR_VALID_ITERATOR = 'WrapForValidIterator';
var setInternalState = InternalStateModule.set;

var createIteratorProxyPrototype = function (IS_ITERATOR) {
  var getInternalState = InternalStateModule.getterFor(IS_ITERATOR ? WRAP_FOR_VALID_ITERATOR : ITERATOR_HELPER);

  return defineBuiltIns(create(IteratorPrototype), {
    next: function next() {
      var state = getInternalState(this);
      // for simplification:
      //   for `%WrapForValidIteratorPrototype%.next` our `nextHandler` returns `IterResultObject`
      //   for `%IteratorHelperPrototype%.next` - just a value
      if (IS_ITERATOR) return state.nextHandler();
      try {
        var result = state.done ? undefined : state.nextHandler();
        return createIterResultObject(result, state.done);
      } catch (error) {
        state.done = true;
        throw error;
      }
    },
    'return': function () {
      var state = getInternalState(this);
      var iterator = state.iterator;
      state.done = true;
      if (IS_ITERATOR) {
        var returnMethod = getMethod(iterator, 'return');
        return returnMethod ? call(returnMethod, iterator) : createIterResultObject(undefined, true);
      }
      if (state.inner) try {
        iteratorClose(state.inner.iterator, 'normal');
      } catch (error) {
        return iteratorClose(iterator, 'throw', error);
      }
      if (iterator) iteratorClose(iterator, 'normal');
      return createIterResultObject(undefined, true);
    }
  });
};

var WrapForValidIteratorPrototype = createIteratorProxyPrototype(true);
var IteratorHelperPrototype = createIteratorProxyPrototype(false);

createNonEnumerableProperty(IteratorHelperPrototype, TO_STRING_TAG, 'Iterator Helper');

module.exports = function (nextHandler, IS_ITERATOR) {
  var IteratorProxy = function Iterator(record, state) {
    if (state) {
      state.iterator = record.iterator;
      state.next = record.next;
    } else state = record;
    state.type = IS_ITERATOR ? WRAP_FOR_VALID_ITERATOR : ITERATOR_HELPER;
    state.nextHandler = nextHandler;
    state.counter = 0;
    state.done = false;
    setInternalState(this, state);
  };

  IteratorProxy.prototype = IS_ITERATOR ? WrapForValidIteratorPrototype : IteratorHelperPrototype;

  return IteratorProxy;
};


code:
'use strict';
var $ = require('../internals/export');
var call = require('../internals/function-call');
var IS_PURE = require('../internals/is-pure');
var FunctionName = require('../internals/function-name');
var isCallable = require('../internals/is-callable');
var createIteratorConstructor = require('../internals/iterator-create-constructor');
var getPrototypeOf = require('../internals/object-get-prototype-of');
var setPrototypeOf = require('../internals/object-set-prototype-of');
var setToStringTag = require('../internals/set-to-string-tag');
var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
var defineBuiltIn = require('../internals/define-built-in');
var wellKnownSymbol = require('../internals/well-known-symbol');
var Iterators = require('../internals/iterators');
var IteratorsCore = require('../internals/iterators-core');

var PROPER_FUNCTION_NAME = FunctionName.PROPER;
var CONFIGURABLE_FUNCTION_NAME = FunctionName.CONFIGURABLE;
var IteratorPrototype = IteratorsCore.IteratorPrototype;
var BUGGY_SAFARI_ITERATORS = IteratorsCore.BUGGY_SAFARI_ITERATORS;
var ITERATOR = wellKnownSymbol('iterator');
var KEYS = 'keys';
var VALUES = 'values';
var ENTRIES = 'entries';

var returnThis = function () { return this; };

module.exports = function (Iterable, NAME, IteratorConstructor, next, DEFAULT, IS_SET, FORCED) {
  createIteratorConstructor(IteratorConstructor, NAME, next);

  var getIterationMethod = function (KIND) {
    if (KIND === DEFAULT && defaultIterator) return defaultIterator;
    if (!BUGGY_SAFARI_ITERATORS && KIND && KIND in IterablePrototype) return IterablePrototype[KIND];

    switch (KIND) {
      case KEYS: return function keys() { return new IteratorConstructor(this, KIND); };
      case VALUES: return function values() { return new IteratorConstructor(this, KIND); };
      case ENTRIES: return function entries() { return new IteratorConstructor(this, KIND); };
    }

    return function () { return new IteratorConstructor(this); };
  };

  var TO_STRING_TAG = NAME + ' Iterator';
  var INCORRECT_VALUES_NAME = false;
  var IterablePrototype = Iterable.prototype;
  var nativeIterator = IterablePrototype[ITERATOR]
    || IterablePrototype['@@iterator']
    || DEFAULT && IterablePrototype[DEFAULT];
  var defaultIterator = !BUGGY_SAFARI_ITERATORS && nativeIterator || getIterationMethod(DEFAULT);
  var anyNativeIterator = NAME === 'Array' ? IterablePrototype.entries || nativeIterator : nativeIterator;
  var CurrentIteratorPrototype, methods, KEY;

  // fix native
  if (anyNativeIterator) {
    CurrentIteratorPrototype = getPrototypeOf(anyNativeIterator.call(new Iterable()));
    if (CurrentIteratorPrototype !== Object.prototype && CurrentIteratorPrototype.next) {
      if (!IS_PURE && getPrototypeOf(CurrentIteratorPrototype) !== IteratorPrototype) {
        if (setPrototypeOf) {
          setPrototypeOf(CurrentIteratorPrototype, IteratorPrototype);
        } else if (!isCallable(CurrentIteratorPrototype[ITERATOR])) {
          defineBuiltIn(CurrentIteratorPrototype, ITERATOR, returnThis);
        }
      }
      // Set @@toStringTag to native iterators
      setToStringTag(CurrentIteratorPrototype, TO_STRING_TAG, true, true);
      if (IS_PURE) Iterators[TO_STRING_TAG] = returnThis;
    }
  }

  // fix Array.prototype.{ values, @@iterator }.name in V8 / FF
  if (PROPER_FUNCTION_NAME && DEFAULT === VALUES && nativeIterator && nativeIterator.name !== VALUES) {
    if (!IS_PURE && CONFIGURABLE_FUNCTION_NAME) {
      createNonEnumerableProperty(IterablePrototype, 'name', VALUES);
    } else {
      INCORRECT_VALUES_NAME = true;
      defaultIterator = function values() { return call(nativeIterator, this); };
    }
  }

  // export additional methods
  if (DEFAULT) {
    methods = {
      values: getIterationMethod(VALUES),
      keys: IS_SET ? defaultIterator : getIterationMethod(KEYS),
      entries: getIterationMethod(ENTRIES)
    };
    if (FORCED) for (KEY in methods) {
      if (BUGGY_SAFARI_ITERATORS || INCORRECT_VALUES_NAME || !(KEY in IterablePrototype)) {
        defineBuiltIn(IterablePrototype, KEY, methods[KEY]);
      }
    } else $({ target: NAME, proto: true, forced: BUGGY_SAFARI_ITERATORS || INCORRECT_VALUES_NAME }, methods);
  }

  // define iterator
  if ((!IS_PURE || FORCED) && IterablePrototype[ITERATOR] !== defaultIterator) {
    defineBuiltIn(IterablePrototype, ITERATOR, defaultIterator, { name: DEFAULT });
  }
  Iterators[NAME] = defaultIterator;

  return methods;
};


code:
'use strict';
var call = require('../internals/function-call');
var map = require('../internals/iterator-map');

var callback = function (value, counter) {
  return [counter, value];
};

// `Iterator.prototype.indexed` method
// https://github.com/tc39/proposal-iterator-helpers
module.exports = function indexed() {
  return call(map, this, callback);
};


code:
'use strict';
var call = require('../internals/function-call');
var aCallable = require('../internals/a-callable');
var anObject = require('../internals/an-object');
var getIteratorDirect = require('../internals/get-iterator-direct');
var createIteratorProxy = require('../internals/iterator-create-proxy');
var callWithSafeIterationClosing = require('../internals/call-with-safe-iteration-closing');

var IteratorProxy = createIteratorProxy(function () {
  var iterator = this.iterator;
  var result = anObject(call(this.next, iterator));
  var done = this.done = !!result.done;
  if (!done) return callWithSafeIterationClosing(iterator, this.mapper, [result.value, this.counter++], true);
});

// `Iterator.prototype.map` method
// https://github.com/tc39/proposal-iterator-helpers
module.exports = function map(mapper) {
  anObject(this);
  aCallable(mapper);
  return new IteratorProxy(getIteratorDirect(this), {
    mapper: mapper
  });
};


code:
'use strict';
var fails = require('../internals/fails');
var isCallable = require('../internals/is-callable');
var isObject = require('../internals/is-object');
var create = require('../internals/object-create');
var getPrototypeOf = require('../internals/object-get-prototype-of');
var defineBuiltIn = require('../internals/define-built-in');
var wellKnownSymbol = require('../internals/well-known-symbol');
var IS_PURE = require('../internals/is-pure');

var ITERATOR = wellKnownSymbol('iterator');
var BUGGY_SAFARI_ITERATORS = false;

// `%IteratorPrototype%` object
// https://tc39.es/ecma262/#sec-%iteratorprototype%-object
var IteratorPrototype, PrototypeOfArrayIteratorPrototype, arrayIterator;

/* eslint-disable es/no-array-prototype-keys -- safe */
if ([].keys) {
  arrayIterator = [].keys();
  // Safari 8 has buggy iterators w/o `next`
  if (!('next' in arrayIterator)) BUGGY_SAFARI_ITERATORS = true;
  else {
    PrototypeOfArrayIteratorPrototype = getPrototypeOf(getPrototypeOf(arrayIterator));
    if (PrototypeOfArrayIteratorPrototype !== Object.prototype) IteratorPrototype = PrototypeOfArrayIteratorPrototype;
  }
}

var NEW_ITERATOR_PROTOTYPE = !isObject(IteratorPrototype) || fails(function () {
  var test = {};
  // FF44- legacy iterators case
  return IteratorPrototype[ITERATOR].call(test) !== test;
});

if (NEW_ITERATOR_PROTOTYPE) IteratorPrototype = {};
else if (IS_PURE) IteratorPrototype = create(IteratorPrototype);

// `%IteratorPrototype%[@@iterator]()` method
// https://tc39.es/ecma262/#sec-%iteratorprototype%-@@iterator
if (!isCallable(IteratorPrototype[ITERATOR])) {
  defineBuiltIn(IteratorPrototype, ITERATOR, function () {
    return this;
  });
}

module.exports = {
  IteratorPrototype: IteratorPrototype,
  BUGGY_SAFARI_ITERATORS: BUGGY_SAFARI_ITERATORS
};


code:
'use strict';
var toLength = require('../internals/to-length');

// `LengthOfArrayLike` abstract operation
// https://tc39.es/ecma262/#sec-lengthofarraylike
module.exports = function (obj) {
  return toLength(obj.length);
};