Failed to load function definition from source

[Light Yagami]

When running firebase emulator , I randomly (70% of the time) encounter this issue:

```

!!  functions: Failed to load function definition from source: FirebaseError: User code failed to load. Cannot determine backend specification

```

Restarting the emulator a couple of time fixes the issue temporarily.

Any help would be appreciated 

[Cole Rogers]

Do you mind posting the generated `firebase-debug.log` from a run with this error? It will help us figure out what problem is occurring under the hood. Thanks!

[Light Yagami]

There's no `firebase-debug.log` generated for some reason

[Clément Lizé]

Same problem here, it seems to be only related to a new function I created based on a firestore onWrite event. When I deploy without this new function, it works 100%. But whenever I include the commits related to it, it starts failing.

We have plenty of very similar functions that work fine in the repository, but somehow adding this one makes the deployment fail.

Surprisingly, setting the "--debug" flag to our CI seems to make the deployment work. I mean isn't this flag supposed to add verbose only??

We're on Node 16 and using firebase-function version ^3.23.0

Also these issues seem to be strongly related:

https://groups.google.com/g/firebase-talk/c/138ConurwtM
https://stackoverflow.com/questions/73756329/deployment-error-with-nuxt-v2-and-firebase-functions