[Webkit-unassigned] [Bug 246776] Firebase child iframe event issue

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=246776

--- Comment #2 from Mehdi <mars.martian at gmail.com> ---
I don't have a minimal test case yet as I am an end user of Firebase and merely reporting an error that their library runs into.

You can repro it by going to https://fir-ui-demo-84a6c.firebaseapp.com/? and trying to login via Google. In the console, you'll see an error at a line like:

`const { urlResponse, sessionId, postBody, tenantId, error, type } = event;`

where event is a MessageEvent.

This runs into the error: TypeError: Right side of assignment cannot be destructured

I have tried to repro using a minimal MessageEvent but not been able to.

I also tried to run a webkit bisect but the archived builds for Mac don't seem to go back far enough to find a passing case.

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