Pierre Ossman Reporter
	Description • 6 years ago

User Agent: Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:61.0) Gecko/20100101 Firefox/61.0
Build ID: 20180625102006

Steps to reproduce:

1. Opened the Debugger tab in Developer Tools.
2. Opened a page with ES6 modules.


Actual results:

Only the ES6 module directly referenced on the page is listed in Sources.


Expected results:

Every ES6 module currently loaded should have been listed in Sources.

	Pierre Ossman Reporter
	Comment 1 • 6 years ago

This is pretty severe as it makes it impossible to debug modern Javascript.

Noteworthy is the fact that the modules show up fine if I load the page with Developer Tools closed. However breakpoints aren't active when it is closed so it is only a partial workaround.

(Not sure if this falls under bug 1436580. I'm guessing not as that bug seems to discuss new features...)

	David Olah
	Comment 2 • 6 years ago

Hi Pierre Ossman,

Can you please give me a test case (or an exact example of website) with which I can reproduce this issue?

	Pierre Ossman Reporter
	Comment 3 • 6 years ago

Simple test case. Consists of two minimal module. "first.js" always shows up, but "second.js" does not show up if Developer tools are up when the page is loading.

	Lekebjerg
	Comment 4 • 6 years ago

Just to confirm Pierre’s observation using rv 61.0.1 and rv 62.0b7

I have my main js in the root folder and all modules in a modules sub folder
Sources appear fine when opening devtools, but after a page refresh only the main js appears in the source pane
Only main js appears when browsing to the site with dev tools open
When the js appears missing breakpoints are not active

Thanks
Lenan

	David Olah
	Comment 5 • 6 years ago

Thank you Pierre for the test case, and sorry for the late response.

I could reproduce the issue using the test case, but not every time. I hit the refresh button a few times to be able to.
Reproduced on Windows 10 and ubuntu 16.04 on Firefox 62.0b12, Firefox 61.0.1 and Nightly 63.0a1 (2018-07-29).

I am marking the issue as New now.

	Jason Laster [:jlast]
	Comment 6 • 6 years ago

Hey Pierre, David, we just landed a fix! Could you test tomorrow on Firefox Nightly?

	Pierre Ossman Reporter
	Comment 7 • 6 years ago

Tested 63.0a1 (2018-08-23) (64-bit) and seems to work well. I can see all the files and breakpoints that trigger on load now work. Nice job. :)

Will this be backported?

	Jason Laster [:jlast]
	Comment 8 • 6 years ago

That's great. Which version would you like it backported to?

	Pierre Ossman Reporter
	Comment 9 • 6 years ago

ESR primarily, as it will be some while before that naturally gets this otherwise. But 62 and 61 would be nice as well so I can actually start using this in my normal browser. :)

	Jason Laster [:jlast]
	Comment 10 • 6 years ago

That makes complete sense. I think at the moment this will be difficult to do. Fortunately, dev-edition will have support soon.