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A Chrome App I've made works perfectly fine for me, but another user gets an error Uncaught ReferenceError: Promise is not defined when starting it up. For some reason it doesn't understand what a Promise is. The code works perfectly fine on my end and I've never gotten that error before, but the user gets it every time. What could be the issue here?

A Chrome App I've made works perfectly fine for me, but another user gets an error Uncaught ReferenceError: Promise is not defined when starting it up. For some reason it doesn't understand what a Promise is. The code works perfectly fine on my end and I've never gotten that error before, but the user gets it every time. What could be the issue here?

• javascript
• google-chrome
• promise
• google-chrome-app

Share Improve this question Follow edited Apr 21, 2014 at 15:40 sowbug 4,6822323 silver badges2929 bronze badges asked Apr 21, 2014 at 0:54 FabisFabis 2,07233 gold badges2323 silver badges4242 bronze badges 4

• The problem is that there isn't such a variable in my code, and even when I'm using the same version the user is using on my PC, everything loads fine. I don't know if posting the code will help, because it is "Uglified" and pretty hard to read. Could the problem be because of an outdated browser or something? I've even looked through the code and the word Promise is mentioned only 2 times and both times it is properly used with the "new" keyword, like this: new Promise(function(a){}) – Fabis Commented Apr 21, 2014 at 1:00
• There must be something in your code trying to use Promise (since it says ReferenceError). Or if you included scripts from other domain the problem might be in those scripts. – Derek 朕會功夫 Commented Apr 21, 2014 at 1:03
• 1 It might be because of outdated browser since Promise is only supported after Chrome 32. – Derek 朕會功夫 Commented Apr 21, 2014 at 1:05
• That must be it! The user updated his browser and everything works now. – Fabis Commented Apr 21, 2014 at 1:05

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4 Answers 4

Sorted by: Reset to default 5

The user updated Chrome to the latest version and that apparently fixed it. I don't know how, since his version was from December 2013 and surely Promises worked back then. I don't know. It definitely isn't a problem with the code since I'm running the same exact version the user is running and I've never encountered that error.

But yeah - apparently fixed.

EDIT: Apparently Promises only work since Chrome 32, so yeah that's why the error.

To support IE and older versions of other browsers, you should consider loading a polyfill for the Promise object.

One implementation you can use out of the box with a <script> tag is available here.

Primise in Old Browsers

​Android 4.x browser Promise ​

I had similar problem ​in Android 4.X browsers. I solved it by using es6-promise in webpack config: ​ ​Promise: 'es6-promise' ​

​plugins: [
    ​    //tells webpack where to store data about your bundles.
    ​    new BundleTracker({filename: './webpack-stats.json'}),        ​
    ​    //makes jQuery available in every module
    ​    new webpack.ProvidePlugin({
    ​        $: 'jquery',        ​
    ​        jQuery: 'jquery',
    ​        'window.jQuery': 'jquery',
    ​        Promise: 'es6-promise'
    ​    }),
​    // Configure path for served CSS files ("desktop_css" will be served as /dist/desktop_css.css)    ​
​    new ExtractTextPlugin('[name].css'),    ​
​],

---

Can I use Promise: ​http://caniuse./#feat=promises

---

some related links:

​​axios IE promise doesn't work

https://github./axios/axios/issues/188

https://github./webpack/webpack/issues/4254

Not an expert in this field, but maybe this will help someone.

Got the same issue on Cordova Android app on Android 4.4.

Fixed by running this mands

 1. cordova plugin rm cordova-plugin-inapppurchase --save
 2. cordova plugin add https://github./AlexDisler/cordova-plugin-inapppurchase#1968e41d173481eb2e6a536fdc55cc9e9253e6d5 --save 

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