Service Worker doesn't work because dart2js doesn't understand Promise

[DartBot]

This issue was originally filed by [email protected]

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What steps will reproduce the problem?

1. download the attached zip file
2. launch in dartium or chrome
3. try to change the service worker file sw.js or sw.dart

What is the expected output? What do you see instead?

If you launch in dartium with the js Service Worker it should work.
If you launch in dartium with the dart Service Worker you get an error : AbortError: The Service Worker installation failed.

If you launch in chrome with the js Service Worker you get the error : undefined is not a function on line 13
Here the register method inside ServiceWorker return normally a Future<dynamic> but instead it return a Null Object.

If you launch in chrome with the dart Service Worker your get two error :

• undefined is not a function on line 13 the same as the javascript version
• Operation failed by security issue

I use sdk version 1.8.5 on a windows_x64

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Attachment:
testSW.zip (370.29 KB)

[sethladd]

cc @alan-knight.
Removed Priority-Unassigned label.
Added Priority-Medium, Library-Html, Area-Library, Triaged labels.

[sethladd]

Thanks for the report!

[alan-knight]

ServiceWorker will not work in Dartium, at least not with Dart code, because Dartium isolates are not WebWorkers.

In dart2js the issue is that register returns a Promise, and dart2js/ the dart:html library doesn't know how to deal with Promises. That's fixable, and seems important.

For both, I think the short term workaround would be to use the Service Worker as compiled to JS, and to do the registration using JS interop.

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Set owner to @alan-knight.
Removed Priority-Medium label.
Added Priority-High, Accepted labels.
Changed the title to: "Service Worker doesn't work because dart2js doesn't understand Promise".

[kasperl]

Added this to the 1.10 milestone.

[alan-knight]

Removed this from the 1.10 milestone.
Marked this as being blocked by #21573, #23007.

[pietergreyling]

Do we have an update regarding Dart Service Worker support? It would also be useful to be able to plug in any existing Service Worker code written in JavaScript via Dart/JS interop.

[matanlurey]

I believe this is fixed.