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phone_login/lib/auth/auth_state.dart

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import 'package:flutter/material.dart';
import 'package:firebase_auth/firebase_auth.dart';
class AuthState extends ChangeNotifier {
User? _user;
User? get user => _user;
final FirebaseAuth _auth = FirebaseAuth.instance;
AuthState() {
_auth.authStateChanges().listen((user) {
_user = user;
notifyListeners();
});
}
bool get isLoggedIn => _user != null;
}