Should be able to step through .js code when source fails to load

Describe the bug If loading the source from the source map fails, it should be possible to step through the underlying .js code. Instead I’m given an unhelpful window that just says something like

Could not load source '/yadda/yadda/node_modules/yadda/foo.ts': Unable to retrieve source content.

To Reproduce Steps to reproduce the behavior:

1. Make an app/script that uses a package dependency, where that dependency has source maps, but no source code to go with them (e.g. no embedded source in the source map, and delete any corresponding .ts files from the installed dependency in node_modules)
2. Set a breakpoint in your app on a call into that dependency
3. Step into the call
4. Desired: Have some way to see the .js code at least and step through it. Actual: Just get to see the error message and no code.

VS Code Version: 1.49.0

Additional context I used to be able to work around this by turning off the “new” debugger, as the “old” one didn’t have this problem. But with 1.49.0, it seems the legacy debugger is gone, or at least all the settings to choose it are gone AFAICT?

[connor4312]

You can try this out in the next nightly build

[mgabeler-lee-6rs]

My dependency trees commonly have over 1500 packages, so … that is not a reasonable way to do it, esp. if that’s per launch config (of which I think I have hundreds across the dozens of repos I have in my workspace).