Need add support for Firebase Admin

[anhquoctran]

Need add support for Firebase Admin SDK. Such as Firestore, Realtime DB and Cloud Storage.

[davideast]

Hey @anhquoctran! Sorry for the very late response. Can you provide a bit more about your use case for Firebase Admin?

[dgadelha]

@davideast This would allow to use rxfire/rxjs as a replacement for firebase-admin on Node.js

[mralbobo]

Pretty simple usecase really: "to use rxjs in scenarios where we're using firebase-admin". More specific examples:

• http callable cloud function
• use with the nest framework (or anything else that's heavily invested into rxjs)

In the rtdb case an angle would simply be: reverting back to when both firebase and firebase-admin shared the same Reference type and rxfire just worked as a side effect of that.