internal-state.js
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	var NATIVE_WEAK_MAP = require('../internals/weak-map-basic-detection');
	var global = require('../internals/global');
	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 = global.TypeError;
	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());
	/* 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 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 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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