sigup and sign out using firebase auth in flutter

1final FirebaseAuth _auth = FirebaseAuth.instance;
2
3Future<void> _signOut() async {
4    await _auth.signOut();
5  }

1final FirebaseAuth _auth = FirebaseAuth.instance;
2
3Future<void> _signOut() async {
4    await _auth.signOut();
5    await _googleSignIn.signOut();
6  }

1 Future<Null> _signOut() async {
2    await _auth.signOut();
3    this.setState(() {
4      isLoading = false;
5    });
6    Navigator.of(context).pushAndRemoveUntil(
7        MaterialPageRoute(builder: (context) => MyApp()),
8        (Route<dynamic> route) => false);
9  }