Zone.js propagates false positive unhandled rejections about angular

[kamtschatka]

I think you are misunderstanding the issue here.
The fact that Stackblitz doesn't convert await into a generator function does not matter. We came across this issue, because we are writing code that runs side-by-side with an Angular application (which I guess does this transpilation, eventhough technically Angular seems to only support browsers that have native Promise support) and the ZoneJS behavior causes issues in our code (and ultimately in the Angular application, because they show an error screen whenever an uncaught exception happens. In the code it is not actually uncaught, ZoneJS just changes the behavior).

Seems like when ZoneJS is on the page, it currently requires ALL the code on the page to have await transpiled into a generator function, which should not be a requirement.

[JiaLiPassion]

@ldellorto
I run your sample in local, it can not be reproduced, it seems stackblitz not transpile async/await to Promise. Could you try it in your local?

[JeanMeche]

+1 This is a stackblitz issue.

Stackblitz does't convert await into a generator function when targeting ES2017 and above. So this isn't patched by zone.js.

[JoostK]

Is this the same problem as reported in #51328?

[kamtschatka]

Yeah that seems to be the same issue. thx.