'use strict'; var global = require('./_global'); var each = require('./_array-methods')(0); var redefine = require('./_redefine'); var meta = require('./_meta'); var assign = require('./_object-assign'); var weak = require('./_collection-weak'); var isObject = require('./_is-object'); var validate = require('./_validate-collection'); var NATIVE_WEAK_MAP = require('./_validate-collection'); var IS_IE11 = !global.ActiveXObject && 'ActiveXObject' in global; var WEAK_MAP = 'WeakMap'; var getWeak = meta.getWeak; var isExtensible = Object.isExtensible; var uncaughtFrozenStore = weak.ufstore; var InternalMap; var wrapper = function (get) { return function WeakMap() { return get(this, arguments.length > 0 ? arguments[0] : undefined); }; }; var methods = { // 23.3.3.3 WeakMap.prototype.get(key) get: function get(key) { if (isObject(key)) { var data = getWeak(key); if (data === true) return uncaughtFrozenStore(validate(this, WEAK_MAP)).get(key); return data ? data[this._i] : undefined; } }, // 23.3.3.5 WeakMap.prototype.set(key, value) set: function set(key, value) { return weak.def(validate(this, WEAK_MAP), key, value); } }; // 23.3 WeakMap Objects var $WeakMap = module.exports = require('./_collection')(WEAK_MAP, wrapper, methods, weak, true, true); // IE11 WeakMap frozen keys fix if (NATIVE_WEAK_MAP && IS_IE11) { InternalMap = weak.getConstructor(wrapper, WEAK_MAP); assign(InternalMap.prototype, methods); meta.NEED = true; each(['delete', 'has', 'get', 'set'], function (key) { var proto = $WeakMap.prototype; var method = proto[key]; redefine(proto, key, function (a, b) { // store frozen objects on internal weakmap shim if (isObject(a) && !isExtensible(a)) { if (!this._f) this._f = new InternalMap(); var result = this._f[key](a, b); return key == 'set' ? this : result; // store all the rest on native weakmap } return method.call(this, a, b); }); }); }