expo/src/__tests__/__fbBatchedBridgeConfig-test.ts

The Expo SDK

import 'react-native';
import '../Expo.fx';
import { Platform } from 'expo-modules-core';

if (Platform.OS === 'web') {
  it('provides a helpful error message on web', () => {
    // @ts-ignore
    expect(() => global.__fbBatchedBridgeConfig).toThrow(
      /Your web project is importing a module from 'react-native' instead of 'react-native-web'/
    );
  });
} else {
  it(`does not change the functionality of __fbBatchedBridgeConfig on native`, () => {
    // @ts-ignore
    expect(() => global.__fbBatchedBridgeConfig).not.toThrow();
  });
}