[Webkit-unassigned] [Bug 272967] New: messageerror event doesn't fire on ServiceWorkerGlobalScope

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=272967

            Bug ID: 272967
           Summary: messageerror event doesn't fire on
                    ServiceWorkerGlobalScope
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Service Workers
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: philip at foolip.org

Disclaimer: I'm not totally sure about the root cause here, but something needs fixing either in WebKit, WPT, or BCD.

In BCD, the messageerror event for ServiceWorkerGlobalScope is marked as partially supported in Safari, because the event never fires:
https://github.com/mdn/browser-compat-data/blob/7752b0a038a04ee47f112e696706bd53a589b0c6/api/ServiceWorkerGlobalScope.json#L617

That refers to https://bugs.webkit.org/show_bug.cgi?id=171216, which is closed as fixed. But from the patch it's not easy to tell if the event actually fires now or not.

Turning to WPT, this test failure suggests that the event doesn't fire:
https://wpt.fyi/results/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-serviceworker-failure.https.html?run_id=5176510071177216&run_id=5153332145946624&run_id=5195972581261312&run_id=5076778648862720

The failure message points to this line of the test being reached:
https://github.com/web-platform-tests/wpt/blob/1cafd038c989f47a1e136844d09ca85a06f85ce0/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/resources/serviceworker-failure.js#L16C27-L16C55

So my best guess is that WebKit doesn't fire the messageerror event on ServiceWorkerGlobalScope, and instead fires a message event with data being set to null.

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