1760480 - inline source map from evaled source not working

Status: UNCONFIRMED

(DevTools :: Debugger, defect, P3)

Description

[John-David Dalton]

Steps to reproduce:

This is hard to reproduce but I've noticed that in Firefox 96.0.3 in a rather large code base inline source maps work with break points and the file tree view, however in Firefox 97-100.0a1 it no longer works.

Actual results:

The basic case works:
https://output.jsbin.com/tisuhov/1

However in larger code bases it doesn't.

Expected results:

Expected to work.

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'DevTools::Debugger' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 2

[John-David Dalton]

I also noticed a performance difference as well. In Firefox 96.0.3 the debug experience was snappy and fast. In Firefox 97 and up things lock up and are sluggish.

Comment 3

[Hubert Boma Manilla (:bomsy)]

Thanks for the report John.
(In reply to John-David Dalton from comment #2)

I also noticed a performance difference as well. In Firefox 96.0.3 the debug experience was snappy and fast. In Firefox 97 and up things lock up and are sluggish.

Any specific scenarios , STRs or even a webpage would be really helpful to look into.

Thanks a lot

Comment 4

[John-David Dalton]

The scenario was a karma test run. The test runner has 1,000+. assertions. Several hundred eval() based inline source maps. I but a debugger in one of them and noticed it no longer stopping in the debugger. I sent a video of the scenario and results to Honza.

Comment 5

[BugBot [:suhaib / :marco/ :calixte]]

The severity field is not set for this bug.
:bomsy, could you have a look please?

For more information, please visit auto_nag documentation.

Comment 6

[Jan Honza Odvarko [:Honza] (always need-info? me)]

John-David: can I attach the video you shared with me through email to this bug?
(i.e. it'll be publicaly available)

Comment 7

[John-David Dalton]

I'll attach an edited down form.

Comment 8

[John-David Dalton]

Attachment: firefox_98_devtools_bug.mp4