signInWithGoogle

  async signInWithGoogle() {
    try {
      const result = await Expo.Google.logInAsync({
        androidClientId: ANDROID_CLIENT_ID,
        iosClientId: IOS_CLIENT_ID,
        behavior: 'web',
        iosClientId: '', //enter ios client id
        scopes: ['profile', 'email']
      });
      
      if (result.type  === 'success') {
        await firebase.auth().setPersistence(firebase.auth.Auth.Persistence.LOCAL);
        const credential = firebase.auth.GoogleAuthProvider.credential(data.idToken, data.accessToken);
        const googleProfileData = await firebase.auth().signInWithCredential(credential);
        this.onLoginSuccess.bind(this);
      }
    } catch ({ message }) {
      alert('login: Error:' + message);
    }
  }