abstract class CustomState<T extends StatefulWidget> extends State<T> {
  ThemeData get theme => Theme.of(context);

  TextTheme get textTheme => theme.textTheme;

  Translations get translation => Translations.of(context);
}

class MyWidget extends StatefulWidget {
  @override
  _MyWidgetState createState() => _MyWidgetState();
}

class _MyWidgetState extends CustomState<MyWidget> {
  @override
  Widget build(BuildContext context) {
    print(textTheme);
    print(translation);
    print(theme);
    return Container();
  }
}