1 var NATIVE_WEAK_MAP = require('../internals/native-weak-map');
2 var global = require('../internals/global');
3 var isObject = require('../internals/is-object');
4 var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
5 var objectHas = require('../internals/has');
6 var sharedKey = require('../internals/shared-key');
7 var hiddenKeys = require('../internals/hidden-keys');
9 var WeakMap = global.WeakMap;
12 var enforce = function (it) {
13 return has(it) ? get(it) : set(it, {});
16 var getterFor = function (TYPE) {
17 return function (it) {
19 if (!isObject(it) || (state = get(it)).type !== TYPE) {
20 throw TypeError('Incompatible receiver, ' + TYPE + ' required');
25 if (NATIVE_WEAK_MAP) {
26 var store = new WeakMap();
27 var wmget = store.get;
28 var wmhas = store.has;
29 var wmset = store.set;
30 set = function (it, metadata) {
31 wmset.call(store, it, metadata);
35 return wmget.call(store, it) || {};
38 return wmhas.call(store, it);
41 var STATE = sharedKey('state');
42 hiddenKeys[STATE] = true;
43 set = function (it, metadata) {
44 createNonEnumerableProperty(it, STATE, metadata);
48 return objectHas(it, STATE) ? it[STATE] : {};
51 return objectHas(it, STATE);