Setup the React Native App - index.js

index.js

// RNApp/app/index.js
import config from './config';
import { GoogleSignin } from 'react-native-google-signin';

/*
  Removed for brevity
*/

componentWillMount() {
  GoogleSignin.configure({
    iosClientId: config.google.iosClientId,
  });

  ddpClient.connect((error, wasReconnect) => {
    if (error) {
      this.setState({connected: false});
    } else {
      this.setState({connected: true});
      ddpClient.loginWithToken((err, res) => {
        if (!err) this.handleSignedInStatus(true);
      });
    }
  });
}