Firebase google sign-in

googleSignin.js

function getCredential(token) {
  return { token, secret: 'SomeRandomNumber', provider: 'google' };
}

function signInWithCredential(token) {
  return firebase.auth().signInWithCredential(getCredential(token))
  .then(user => {
    console.log('signed in');
  })
}

function googleSignin() {
  GoogleSignin.signIn().then(user => {
    signInWithCredential(user.idToken);
  })
}