void main() async {
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp();
final getIt = GetIt.instance;
getIt.registerSingleton(SettingStore());
getIt.registerSingleton(BookStore());
runApp(
MyApp()
);
}
_settingStore ??= GetIt.I();
_bookStore ??= GetIt.I();