When emulator/deploy fails to start due to timeout, report actual error and workaround.

[MaitreyaBuddha]

I'm putting this here so maybe I or someone can work on fixing it. If you're getting

 FirebaseError: User code failed to load. Cannot determine backend specification

It could be many reasons. One of which is timeout.

Try

export FUNCTIONS_DISCOVERY_TIMEOUT=30

(from #8161 (comment))
If that works it was a timeout on a large codebase.

This feature is to report timeout instead of the ambiguous error, and give the solution.

Also the original template for features has a broken link: https://firebase.google.com/support/contact/bugs-features/

[MaitreyaBuddha]

#8240

[aalej]

Thanks for opening up this issue and filing a PR! I do agree that it would be helpful to improve the error message to include the solution of increasing the timeout by setting the FUNCTIONS_DISCOVERY_TIMEOUT environment variable.

I'll check this with our engineering team