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- '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
- };
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