Attach Javascript stack to Crashlytics

crashalytics_js_stack.js

// If you are using crashlytics and you cannot update to the latest versions of react-native-firebase (or need sourcemaps which is doesn't support) adding middleware to the error handling can at least provide you with an error stack
//Define an error handler to upload thet stack to crashlytics
const defaultHandler = global.ErrorUtils.getGlobalHandler()
const crashlytics = firebase.crashlytics()

global.ErrorUtils.setGlobalHandler((...args) => {
  const error = args[0] || 'Unknown'
  //console.log('Crashlytics error sent', error);

  if (error instanceof Error) {
    crashlytics.setStringValue('stack', `${error.stack}`)
    crashlytics.setStringValue('message', `${error.message}`)
    crashlytics.recordError(0, `RN Fatal: ${error.message}`)
  } else {
    // Have never gotten this log so far. Might not be necessary.
    crashlytics.recordError(0, `RN Fatal: ${error}`)
  }
  crashlytics.log(error.message);

  defaultHandler.apply(this, args);
  //force the native crash
  crashlytics.crash();
});