Deploying functions fails on monorepo deps

[gino-m]

Deploy fails with Cannot find module '@ground/proto'. This started happening after adding a dependency on @ground/proto to the functions package in #1821. The same happen when depending on @ground/lib.

[gino-m]

Things I've tried (unsuccessfully):

• Referring to full path of index ('@ground/proto/dist/index')
• Upgrading firebase-tools to latest version

It appears monorepos aren't supported by Firebase (firebase/firebase-tools#653), but it's unclear why the deploy was working when functions was only depending on lib, which is currently the case in master.

[gino-m]

but it's unclear why the deploy was working when functions was only depending on lib, which is currently the case in master.

Update: The deploy likely works because the only reference to @ground/lib is in tests.

[gino-m]

Using isolate-package as described here works for both root deploy and deploy from functions/. Sending a patch.