auth_cubit.dart

class AuthCubit extends Cubit<AuthState> {
  AuthCubit() : super(const AuthState.initial(isSignedIn: false)) {
    FirebaseAuth.instance.authStateChanges().listen((User? user) {
      if (user == null) {
        return emit(state.copyWith(isSignedIn: false));
      } else {
        emit(state.copyWith(isSignedIn: true));
      }
    });
  }
}