/***** main.dart *****/
// These calls are inside a column inside build
DieWidget(),
DieWidget(),

/***** die.dart *****/
class Die {
  int value;
  Die({this.value});
}

class DieNotifier extends StateNotifier<Die> {
  DieNotifier([Die die]) : super(die ?? Die(value: 4));

  void increment() {
    state = Die(value: state.value + 1);
  }
}

/***** *****/
final dieProvider = StateNotifierProvider<DieNotifier>((ref) {
  return DieNotifier();
});

class DieWidget extends ConsumerWidget {
  @override
  Widget build(BuildContext context, ScopedReader watch) {
    final die = watch(dieProvider.state);
    return FlatButton(
      child: Text(
        '${die.value}',
      ),
      onPressed: () {
        context.read(dieProvider).increment();
      },
    );
  }
}