navigation_bloc.dart

class NavigatorBloc extends Bloc<NavigatorAction, dynamic>{
  
  final GlobalKey<NavigatorState> navigatorKey;
  NavigatorBloc({this.navigatorKey});

  @override
  dynamic get initialState => 0;

  @override
  Stream<dynamic> mapEventToState(NavigatorAction event) async* {
    if(event is NavigatorActionPop){
      navigatorKey.currentState.pop();
      
    }else if(event is NavigateToHomeEvent){
      navigatorKey.currentState.pushNamed('/home');
      
    }
  }
}

Have you got a full example of project=?