module.name_mapper doesn't work when pointing to a file within flow-typed

[bjohn465]

In my case, I was using module.name_mapper.extension, but module.name_mapper seemed to work the same.

If I have a .flowconfig like this:

[options]
module.name_mapper.extension='mp3' -> '<PROJECT_ROOT>/flow-typed/mp3-stub.js'

Flow will still error with "Required module not found" when importing an MP3 file. I have a reduced case of this.

When I move mp3-stub.js to a different directory, such as flow-stubs, the "Required module not found" error goes away, as seen in this commit of the reduced case.

If this is intended behavior, it may be worth updating the documentation to mention this restriction. I'd be willing to help with updating the documentation, if needed.

[ugiacoman]

@bjohn465 Related to #3687 I'm having the same issue with v0.54.1 @calebmer Any ideas?

[bjohn465]

@ugiacoman Moving the stubs from <PROJECT_ROOT>/flow-typed to <PROJECT_ROOT>/flow-stubs worked for me. I didn't find #3687 when I was searching for a solution, but it looks like #3687's workaround was similar to mine: Moving the stubs to another directory.

[ugiacoman]

@bjohn465 Woah, that's weird. So it just can't be inside of ./flow-typed... I just tried it and it worked as well. Still not ideal though.