/*!
 * weakmap-polyfill v2.0.0 - ECMAScript6 WeakMap polyfill
 * https://github.com/polygonplanet/weakmap-polyfill
 * Copyright (c) 2015-2016 polygon planet <polygon.planet.aqua@gmail.com>
 * @license MIT
 */
(function(e){"use strict";if(e.WeakMap){return}var t=Object.prototype.hasOwnProperty;var r=function(e,t,r){if(Object.defineProperty){Object.defineProperty(e,t,{configurable:true,writable:true,value:r})}else{e[t]=r}};e.WeakMap=function(){function WeakMap(){if(this===void 0){throw new TypeError("Constructor WeakMap requires 'new'")}r(this,"_id",genId("_WeakMap"));if(arguments.length>0){throw new TypeError("WeakMap iterable is not supported")}}r(WeakMap.prototype,"delete",function(e){checkInstance(this,"delete");if(!isObject(e)){return false}var t=e[this._id];if(t&&t[0]===e){delete e[this._id];return true}return false});r(WeakMap.prototype,"get",function(e){checkInstance(this,"get");if(!isObject(e)){return void 0}var t=e[this._id];if(t&&t[0]===e){return t[1]}return void 0});r(WeakMap.prototype,"has",function(e){checkInstance(this,"has");if(!isObject(e)){return false}var t=e[this._id];if(t&&t[0]===e){return true}return false});r(WeakMap.prototype,"set",function(e,t){checkInstance(this,"set");if(!isObject(e)){throw new TypeError("Invalid value used as weak map key")}var n=e[this._id];if(n&&n[0]===e){n[1]=t;return this}r(e,this._id,[e,t]);return this});function checkInstance(e,r){if(!isObject(e)||!t.call(e,"_id")){throw new TypeError(r+" method called on incompatible receiver "+typeof e)}}function genId(e){return e+"_"+rand()+"."+rand()}function rand(){return Math.random().toString().substring(2)}r(WeakMap,"_polyfill",true);return WeakMap}();function isObject(e){return Object(e)===e}})(typeof self!=="undefined"?self:typeof window!=="undefined"?window:typeof global!=="undefined"?global:this);