+++ /dev/null
-'use strict';
-var global = require('../internals/global');
-var redefineAll = require('../internals/redefine-all');
-var InternalMetadataModule = require('../internals/internal-metadata');
-var collection = require('../internals/collection');
-var collectionWeak = require('../internals/collection-weak');
-var isObject = require('../internals/is-object');
-var enforceIternalState = require('../internals/internal-state').enforce;
-var NATIVE_WEAK_MAP = require('../internals/native-weak-map');
-
-var IS_IE11 = !global.ActiveXObject && 'ActiveXObject' in global;
-var isExtensible = Object.isExtensible;
-var InternalWeakMap;
-
-var wrapper = function (init) {
- return function WeakMap() {
- return init(this, arguments.length ? arguments[0] : undefined);
- };
-};
-
-// `WeakMap` constructor
-// https://tc39.github.io/ecma262/#sec-weakmap-constructor
-var $WeakMap = module.exports = collection('WeakMap', wrapper, collectionWeak);
-
-// IE11 WeakMap frozen keys fix
-// We can't use feature detection because it crash some old IE builds
-// https://github.com/zloirock/core-js/issues/485
-if (NATIVE_WEAK_MAP && IS_IE11) {
- InternalWeakMap = collectionWeak.getConstructor(wrapper, 'WeakMap', true);
- InternalMetadataModule.REQUIRED = true;
- var WeakMapPrototype = $WeakMap.prototype;
- var nativeDelete = WeakMapPrototype['delete'];
- var nativeHas = WeakMapPrototype.has;
- var nativeGet = WeakMapPrototype.get;
- var nativeSet = WeakMapPrototype.set;
- redefineAll(WeakMapPrototype, {
- 'delete': function (key) {
- if (isObject(key) && !isExtensible(key)) {
- var state = enforceIternalState(this);
- if (!state.frozen) state.frozen = new InternalWeakMap();
- return nativeDelete.call(this, key) || state.frozen['delete'](key);
- } return nativeDelete.call(this, key);
- },
- has: function has(key) {
- if (isObject(key) && !isExtensible(key)) {
- var state = enforceIternalState(this);
- if (!state.frozen) state.frozen = new InternalWeakMap();
- return nativeHas.call(this, key) || state.frozen.has(key);
- } return nativeHas.call(this, key);
- },
- get: function get(key) {
- if (isObject(key) && !isExtensible(key)) {
- var state = enforceIternalState(this);
- if (!state.frozen) state.frozen = new InternalWeakMap();
- return nativeHas.call(this, key) ? nativeGet.call(this, key) : state.frozen.get(key);
- } return nativeGet.call(this, key);
- },
- set: function set(key, value) {
- if (isObject(key) && !isExtensible(key)) {
- var state = enforceIternalState(this);
- if (!state.frozen) state.frozen = new InternalWeakMap();
- nativeHas.call(this, key) ? nativeSet.call(this, key, value) : state.frozen.set(key, value);
- } else nativeSet.call(this, key, value);
- return this;
- }
- });
-}