ReactNative ErrorHandling Example - From Expo.io

errorHandlerEx.js

const defaultHandler = (ErrorUtils.getGlobalHandler && ErrorUtils.getGlobalHandler()) || ErrorUtils._globalHandler;
const customErrorHandler = async (err, isFatal) => {
  await AsyncStorage.setItem('lastError', JSON.stringify(err, Object.getOwnPropertyNames(err)));
  return defaultHandler(err, isFatal);
};

ErrorUtils.setGlobalHandler(customErrorHandler);

//inside the App component:
async componentWillMount() {
  const lastError = await AsyncStorage.getItem('lastError');
  // dispatch error to logs
  if (lastError) {
    log({
      sender: 'mobile-ops',
    message: 'Fatal error !',
    info: {
      error: lastError
    }
  });
    await AsyncStorage.removeItem('lastError');
  }
}