importScripts returns undefined in the web workers

Question

For earlier browser versions, Promise is undefined in web workers. So I am using a polyfill Promise by importScripts('Promise.js'), if Promise is undefined. But still I get an undefined object in return.

var promise; if(typeof Promise === undefined) { self.importScripts('./Promise.js').Promise; } promise = new Promise(function (resolve, reject) { var url = ajaxArgs.url || '', data = ajaxArgs.data || {}, type = ajaxArgs.method || 'GET', isGet = type === 'GET', request = new XMLHttpRequest(); ........ }

How can I make this work for web workers?

Bergi · Accepted Answer · 2015-03-31 05:50:38Z

The importScripts function doesn't return anything. When you access a .Promise property on the call, this will throw, and your code stops executing. Btw, typeof never returns undefined, so you were lucky and it was never exected.

if (typeof Promise !== "function") self.importScripts('./Promise.js'); var promise = new Promise(function (resolve, reject) { … });

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