thedesk/app/node_modules/es6-promise/lib/es6-promise/polyfill.js
2018-02-19 02:41:25 +09:00

36 lines
748 B
JavaScript

/*global self*/
import Promise from './promise';
export default function polyfill() {
let local;
if (typeof global !== 'undefined') {
local = global;
} else if (typeof self !== 'undefined') {
local = self;
} else {
try {
local = Function('return this')();
} catch (e) {
throw new Error('polyfill failed because global object is unavailable in this environment');
}
}
let P = local.Promise;
if (P) {
var promiseToString = null;
try {
promiseToString = Object.prototype.toString.call(P.resolve());
} catch(e) {
// silently ignored
}
if (promiseToString === '[object Promise]' && !P.cast){
return;
}
}
local.Promise = Promise;
}