Use with react-native-firebase

Hi, I'm trying to figure out how to use this with react-native-firebase.
I'm getting an error `firebase.firestore is not a function`, even though I can use firestore in my code with `firebase.firestore()` just fine.
Is it possible? Thank you.

Start by reproducing the `firebase.firestore is not a function` error in a react-native-firebase setup and compare it with the repository's Firestore usage. The issue mentions no source files or tests; done would require either confirming supported compatibility and documenting the usage or identifying a concrete fix.

Written by the indexing model from the issue text.