google sign in expo react native firebase code example

Example 1: google sign in in firebase react

//add to your firebase.js file: google provider sign-in
const googleProvider = new firebase.auth.GoogleAuthProvider();
export { firebase, db, auth, functions, googleProvider }

//Actions/GoogleAuthentication.js
import { firebase, googleProvider, db } from '../components/firebase/firebase'
import React, {useEffect} from "react";
import { useHistory, Redirect } from 'react-router-dom'

export const SignInWithGoogle = () => {
    const history = useHistory();
    useEffect(() => {
        setTimeout(() => {
            history.push('/dashboard');
         }, 10000);
       },[]);

    return () => {
        return firebase.auth().signInWithPopup(googleProvider)
        .then(async result =>{
            console.log(result.credential.accessToken)
            const user = result.user
            console.log(user)
            localStorage.setItem('userid', user.uid)
            localStorage.setItem('photoURL', user.photoURL)
            //TODO if userid exists IN USERS db then use update IF NULL use set
            await db.collection('users').doc(user.uid).update({
               // id: user.uid,
                name: user.displayName,
                email: user.email,
                phone: user.phoneNumber,
                photoURL: user.photoURL
            })
        })
        .then(() => {
            history.push('/dashboard');
        })
        .catch( err => {
            console.log(err)
        })       
    }
}

export const startLogout = () => {
    return () => {
        return firebase.auth().signOut()
    }
}

Example 2: react native firebase login with facebook

async function logIn() {
    try {
      await Facebook.initializeAsync({
        appId: "APP ID HERE",
      });
      const {
        type,
        token,
        expirationDate,
        permissions,
        declinedPermissions,
      } = await Facebook.logInWithReadPermissionsAsync({
        permissions: ["public_profile"],
      });
      if (type === "success") {
        alert(`HELLO`);
        console.log("SUCCESS");

        // Get the user's name using Facebook's Graph API
        const response = await fetch(
          `https://graph.facebook.com/me?access_token=${token}`
        );
        Alert.alert("Logged in!", `Hi ${(await response.json()).name}!`);
      } else {
        // type === 'cancel'
      }
    } catch ({ message }) {
      alert(`Facebook Login Error: ${message}`);
    }
  }