Firestore and Auth emulators not playing nice with rules

[conrado]

I've been banging my head against this firestore.rules problem for a few days now. I can't figure out where things are going wrong.

The problem seems to show up only when using the emulators. If document rules are applied that check whether a user is authenticated, permissions are denied even though the user is signed in. This however does not happen when using real firestore. This branch on my fork should have a reproducible sample:

https://github.com/conrado/reactfire/tree/emulators-auth-firestore-permissions-issue

Am I doing something wrong? I first thought it was a react-firebaseui issue, so you will see I even did a version bump on that to see if that fixed things... I have seen other people mention problems with the Auth emulator in other issues, but so far got no clues how to fix this. I'm guessing it may be related to how every library wants to keep their own instance of firebase for themselves. Any help welcomed