Issue when updating Firebase in Flutter App with current user - firebase

Question

I just updated Google Firebase Auth in Flutter app because I was getting some wried SDK errors but now I'm getting
Error: 'currentUser' isn't a function or method and can't be invoked.
var user = await _firebaseAuth.currentUser();
I looked at the migration guide and understand that currentUser() is now synchronous via the currentUser getter. but I'm not sure how I should change my code now to fix this.
My code
class Auth implements BaseAuth {
final auth.FirebaseAuth _firebaseAuth = auth.FirebaseAuth.instance;
#override
Future<String> signIn(String email, String password) async {
var result = await _firebaseAuth.signInWithEmailAndPassword(
email: email, password: password);
var user = result.user;
return user.uid;
}
#override
Future<String> signUp(
String email, String password, String name, String company) async {
final userReference = FirebaseDatabase.instance.reference().child('users');
var result = await _firebaseAuth.createUserWithEmailAndPassword(
email: email, password: password);
var user = result.user;
await userReference
.child(user.uid)
.set(User(user.uid, email, name, company).toJson());
return user.uid;
}
#override
Future<auth.User> getCurrentUser() async {
var user = await _firebaseAuth.currentUser();
return user;
}
#override
Future<void> signOut() async {
return _firebaseAuth.signOut();
}
#override
Future<void> sendEmailVerification() async {
var user = await _firebaseAuth.currentUser();
await user.sendEmailVerification();
}
#override
Future<void> resetPassword(String email) async =>
await _firebaseAuth.sendPasswordResetEmail(email: email);
#override
Future<bool> isEmailVerified() async {
var user = await _firebaseAuth.currentUser();
return user.isEmailVerified;
}
}

Answer 1

It looks like you're using the latest version of the FlutterFire libraries with outdated code.
In previous versions of the libraries, currentUser() was a method, that you had to await. In the latest versions of the library it's a property, and you no longer have to await its result.
So
var user = _firebaseAuth.currentUser;
Also see the documentation on using Firebase Authentication in your Flutter app, specifically the section on monitoring authentication state as it provides a way to listen for updates to the authentication state.