app.auth(...).signInWithCredential is not a function firebase error - node.js

Question

I'm trying to add google login to my node js firebase app. I'm getting the following error:
app.auth(...).signInWithCredential is not a function
Here's the code on the server
var credential = firebase.auth.GoogleAuthProvider.credential(id_token);
return app.auth().signInWithCredential(credential);
On the client
// We need to register an Observer on Firebase Auth to make sure auth is initialized.
var unsubscribe = app.auth().onAuthStateChanged((firebaseUser) => {
unsubscribe();
// Check if we are already signed-in Firebase with the correct user.
// Build Firebase credential with the Google ID token.
var credential = firebase.auth.GoogleAuthProvider.credential(googleUser.getAuthResponse().id_token);
// Sign in with credential from the Google user.
firebase.auth().signInWithCredential(credential).catch( (error) => {
// Handle Errors here.
var errorCode = error.code;
var errorMessage = error.message;
// The email of the user's account used.
var email = error.email;
// The firebase.auth.AuthCredential type that was used.
var credential = error.credential;
console.dir(errorMessage);
}).then( (success) => {
console.dir(success);
var id_token = googleUser.getAuthResponse().id_token;
axios.post('/auth/google-login', {
id_token: id_token
}).then(response => {
var result = response.data;
if (result.status === "ok") {
this.setState({complete: true});
} else if (result.error) {
this.setState({error: result.error});
}
}).catch(error => {
console.dir(error);
this.setState({error: "error"});
});
});
});
What I'm I doing wrong?
At the top of the nodejs file, I have
var app = require('./base');
where base :
var serviceAccount = require("./service-account-file.json");
const app = fadmin.initializeApp({
credential: fadmin.credential.cert(serviceAccount),
databaseURL: "https://test.firebaseio.com"
});
module.exports = app;

Answer 1

Hi there are hints that the problem starts with node version 6.21. that
app.auth().signInWithCredential(credential)
Don't work
It works in v6.2.0.
Try signInWithEmailAndPassword
Use latest version of node

Answer 2

The function signInWithCredential is part of the Firebase JavaScript SDK
The Firebase JavaScript SDK implements the client-side libraries used by applications using Firebase services.
The Firebase Admin SDK is intended to run on a server or other privileged environment. The Admin SDK does not include sign-in functions.