b4-acharcode.dart

    class MyBlocObserver extends BlocObserver {
      @override
      void onCreate(BlocBase bloc) {
        super.onCreate(bloc);
        print('onCreate -- ${bloc.runtimeType}');
      }

      @override
      void onEvent(Bloc bloc, Object? event) {
        super.onEvent(bloc, event);
        print('onEvent -- ${bloc.runtimeType}, $event');
      }

      @override
      void onChange(BlocBase bloc, Change change) {
        super.onChange(bloc, change);
        print('onChange -- ${bloc.runtimeType}, $change');
      }

      @override
      void onTransition(Bloc bloc, Transition transition) {
        super.onTransition(bloc, transition);
        print('onTransition -- ${bloc.runtimeType}, $transition');
      }

      @override
      void onError(BlocBase bloc, Object error, StackTrace stackTrace) {
        print('onError -- ${bloc.runtimeType}, $error');
        super.onError(bloc, error, stackTrace);
      }

      @override
      void onClose(BlocBase bloc) {
        super.onClose(bloc);
        print('onClose -- ${bloc.runtimeType}');
      }
    }