var NATIVE_WEAK_MAP = require('../internals/native-weak-map'); var global = require('../internals/global'); var isObject = require('../internals/is-object'); var createNonEnumerableProperty = require('../internals/create-non-enumerable-property'); var objectHas = require('../internals/has'); 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 WeakMap = global.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 TypeError('Incompatible receiver, ' + TYPE + ' required'); } return state; }; }; if (NATIVE_WEAK_MAP || shared.state) { var store = shared.state || (shared.state = new WeakMap()); var wmget = store.get; var wmhas = store.has; var wmset = store.set; set = function (it, metadata) { if (wmhas.call(store, it)) throw new TypeError(OBJECT_ALREADY_INITIALIZED); metadata.facade = it; wmset.call(store, it, metadata); return metadata; }; get = function (it) { return wmget.call(store, it) || {}; }; has = function (it) { return wmhas.call(store, it); }; } else { var STATE = sharedKey('state'); hiddenKeys[STATE] = true; set = function (it, metadata) { if (objectHas(it, STATE)) throw new TypeError(OBJECT_ALREADY_INITIALIZED); metadata.facade = it; createNonEnumerableProperty(it, STATE, metadata); return metadata; }; get = function (it) { return objectHas(it, STATE) ? it[STATE] : {}; }; has = function (it) { return objectHas(it, STATE); }; } module.exports = { set: set, get: get, has: has, enforce: enforce, getterFor: getterFor };