My cubit is not emitting a new state with freezed?

Question

I am trying to use Cubit for state management and I have a state class with @freezed annotation. I've used cubits before and did not see any issues like that before. In cubit constructor I emit initial state with super constructor and BLocBuilder catches that initial state. Then, whenever I emit a new state, my cubit is actually not emitting. Here is how my code looks like:

promotion_state.dart

part of 'promotion_cubit.dart';

@freezed
abstract class PromotionState with _$PromotionState {
  const factory PromotionState.initial() = _Initial;
  const factory PromotionState.loaded({required TrophyIconType trophyIconType}) = _Loaded;
}

promotion_cubit.dart

Future<void> whenMenuPageDisplayed() async {
  emit(const PromotionState.loaded(trophyIconType: TrophyIconType.withAnimation));
}

menu_page.dart

return BlocProvider<PromotionCubit>(
      create: (_) => getIt<PromotionCubit>()..init(),
      child: BlocBuilder<PromotionCubit, PromotionState>(
        builder: (context, state) => state.maybeWhen(
          initial: () => const SizedBox.shrink(),
          loaded: (trophyIconType) {
            print(state);
            return _TrophyIcon(trophyIconType);
          },
          orElse: () => const SizedBox.shrink(),
        ),
      ),
    );

Where I am calling whenMenuPageDisplayed function:

@injectable
class MyNavigatorObserver extends NavigatorObserver {
  MyNavigatorObserver(this._promotionCubit);

  final PromotionCubit _promotionCubit;

  @override
  void didPush(Route<dynamic> route, Route<dynamic>? previousRoute) {
    if (route.settings.name == '/menu') {
      _promotionCubit.whenMenuPageDisplayed();
    }
  }

  @override
  void didPop(Route<dynamic> route, Route<dynamic>? previousRoute) {
    if (previousRoute!.settings.name == '/menu') {
      _promotionCubit.whenMenuPageDisplayed();
    }
  }
}

print(state); in Loaded state is not displaying any output in the terminal.

Answer 1

For those who stumbled upon this question while doing a google search, the problem was that getIt was creating new instances of the cubit when it was requested.

The solution was to annotate the cubit class with @singleton or @lazySingleton in the authors case.