我需要更新这个代码，我不知道怎么做。有人知道吗？

_initialize() async{
SharedPreferences prefs = await SharedPreferences.getInstance();
bool loggedIn = prefs.getBool(LOGGED_IN) ?? false;
if(!loggedIn){
  _status = Status.Unauthenticated;
}else{
  await auth.currentUser().then((currentUser) async{
    _user = currentUser;
    _status = Status.Authenticated;
    _userModel = await _userServices.getUserById(currentUser.uid);
  });

}
notifyListeners();

}