How to Integrate Crashlytics with React Native app

I just wrote a blog post about this:

Add Crashlytics to your React Native iOS app

The approach I took was to override the logging function of react native to be able to log my own stuff and see it on the crash logs and also generated a sourcemap in order to the see full stack trace.

You could use react-native-fabric It has a good guide and has js methods for both crashlytics and answer