NewFirebaseAuthorizationClient creates a new Firebase authorization client.

NewFirebaseClient creates a new Firebase connection.

NewFirebaseFirestoreClient creates a new Firebase realtime database client.

NewListener creates a new Listener instance for getting firestore snapshots.

NewRouterWithInject creates a new router with inject user middleware.

NewRouterWithTestInject creates a new router with inject testUser middleware.

Listener is a struct for read firestore snapshots.