class GoogleOAuth { static bool get isEnabled => false; static Future signIn(Function(String, String) callback, {bool isSilent = false}) async { // } static Future signUp(Function(String, String) callback) async { // } static Future requestGmailScope() async { // } /* static Future grantOfflineAccess(Function(String, String, String) successCallback, Function errorCallback) async { // } */ static void signOut() async { // } static void disconnect() async { // } }