Undefined class 'FirebaseUser'

Question

I'm new to Flutter. I have an Issue with Firebase Auth/ Google Auth The FirebaseUser is not defined Code:

FirebaseAuth _auth = FirebaseAuth.instance; GoogleSignIn googleSignIn = GoogleSignIn();  Future<FirebaseUser> currentUser() async { // The Issue is here in the Future<>   final GoogleSignInAccount account = await googleSignIn.signIn();   final GoogleSignInAuthentication authentication =       await account.authentication;    final GoogleAuthCredential credential = GoogleAuthProvider.getCredential(       idToken: authentication.idToken, accessToken: authentication.accessToken);    final AuthResult authResult = await _auth.signInWithCredential(credential);   final FirebaseUser user = authResult.user; // and here as I can't define this FirebaseUser object to return    return user; } 

Pubspec.yml

dependencies:   flutter:     sdk: flutter     cupertino_icons: ^0.1.3   firebase_auth: ^0.18.0   location: ^3.0.2   page_transition: ^1.1.6   google_sign_in: ^4.5.1   flutter_facebook_login: ^3.0.0   firebase_database: ^4.0.0 

I also face the same issue with AuthResult

final AuthResult authResult = await _auth.signInWithCredential(credential); 

Answer 1

Starting from Version firebase_auth 0.18.0:

In the newest version of firebase_auth, the class FirebaseUser was changed to User, and the class AuthResult was changed to UserCredential. Therefore change your code to the following:

    Future<User> currentUser() async {       final GoogleSignInAccount account = await googleSignIn.signIn();       final GoogleSignInAuthentication authentication =           await account.authentication;        final GoogleAuthCredential credential = GoogleAuthProvider.credential(           idToken: authentication.idToken,           accessToken: authentication.accessToken);        final UserCredential authResult =           await _auth.signInWithCredential(credential);       final User user = authResult.user;        return user;     } 

---

FirebaseUser changed to User

AuthResult changed to UserCredential

GoogleAuthProvider.getCredential() changed to GoogleAuthProvider.credential()

---

onAuthStateChanged which notifies about changes to the user's sign-in state was replaced with authStateChanges()

currentUser() which is a method to retrieve the currently logged in user, was replaced with the property currentUser and it no longer returns a Future<FirebaseUser>.

Example of the above two methods:

FirebaseAuth.instance.authStateChanges().listen((event) {    print(event.email); }); 

And:

var user = FirebaseAuth.instance.currentUser; print(user.uid); 

---

Deprecation of UserUpdateInfo class for firebaseUser.updateProfile method. Example:

Future updateName(String name, FirebaseUser user) async {   var userUpdateInfo = new UserUpdateInfo();   userUpdateInfo.displayName = name;   await user.updateProfile(userUpdateInfo);   await user.reload();  } 

now

import 'package:firebase_auth/firebase_auth.dart' as firebaseAuth; Future updateName(String name, auth.User firebaseUser) async {   firebaseUser.updateProfile(displayName: name);   await firebaseUser.reload(); }