Browser XHR scheduleTask fails in IE11

[AmyJeanes]

After updating zone.js to the latest version (0.8.12) we started getting errors when loading an Angular page with angular/http calls in Internet Explorer 11 (works fine in Chrome). The request never initiates and there are a few errors in the console:

Unhandled Promise rejection: Unable to get property 'apply' of undefined or null reference ; Zone: <root> ; Task: Promise.then ; Value: TypeError: Unable to get property 'apply' of undefined or null reference TypeError: Unable to get property 'apply' of undefined or null reference
at scheduleTask (https://localhost:44334/dist/vendor.js?v=OQlIcABpA29sHMIhDRnH-EBWeJs6_U6bx7vEgZihM_8:142795:13)
at ZoneDelegate.prototype.scheduleTask (https://localhost:44334/dist/vendor.js?v=OQlIcABpA29sHMIhDRnH-EBWeJs6_U6bx7vEgZihM_8:140947:21)
at Zone.prototype.scheduleTask (https://localhost:44334/dist/vendor.js?v=OQlIcABpA29sHMIhDRnH-EBWeJs6_U6bx7vEgZihM_8:140772:17)
at Zone.prototype.scheduleMacroTask (https://localhost:44334/dist/vendor.js?v=OQlIcABpA29sHMIhDRnH-EBWeJs6_U6bx7vEgZihM_8:140795:13)
at Anonymous function (https://localhost:44334/dist/vendor.js?v=OQlIcABpA29sHMIhDRnH-EBWeJs6_U6bx7vEgZihM_8:142824:17)
at proto[name] (https://localhost:44334/dist/vendor.js?v=OQlIcABpA29sHMIhDRnH-EBWeJs6_U6bx7vEgZ

After digging around a bit, it looks like a very new bit of code could be causing this, introduced in PR #800

The exact line of failure is below, where oriAddListener is undefined, causing the above error :

oriAddListener.apply(data.target, ['readystatechange', newListener]); // line 110

Rolling zone.js back to 0.8.11 which was before that PR fixes the issue and works as expected.

[JiaLiPassion]

@MattJeanes , thank you for posting the issue, I will check it.

[JiaLiPassion]

@MattJeanes , I can not reproduce this issue in IE11, could you post a reproduce repo or the code you use XMLHttpRequest? thanks! I use window 10 + IE11.

I have tried angular/http or pure XMLHttpRequest , both works fine in my environment.

Did you use some other polyfills?

[AmyJeanes]

Hi @JiaLiPassion, after several hours of intense debugging and slowly stripping out my application till it worked, I found that pace was causing the issues. Interesting how it worked on 0.8.11 of zone.js but the changes in 0.8.12 seem to conflict with pace somehow. There's an existing issue on the project about zone.js conflicts so I'll add a comment to that with my findings.

Since this isn't an issue with zone.js itself, I'll close this off. Thanks for your help and quick responses anyway though. 😄