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Looks very exciting! I've used firebase for some small weekend projects and it's been very productive for me.

I'm curious, what's the react native support like for Firestore / firebase in general?

There's a pretty complete React Native library you can use to build with Firebase services, including Cloud Firestore: https://github.com/invertase/react-native-firebase

The Cloud Firestore integration is fresh out of the box, but I'd certainly recommend trying it out!