authForFakeFirestore property
Pass this to FakeFirestore's constructor so it can apply security rules
according to the signed in user. It builds the auth
Map defined at
https://firebase.google.com/docs/reference/rules/rules.firestore.Request#auth.
The reason this is a Map<String, dynamic>?> instead of a User
is because
we don't want to make Fake Cloud Firestore depend on firebase_auth if
possible.
Implementation
late Stream<Map<String, dynamic>?> authForFakeFirestore;