Listener routing to named Route

main.dart

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();

  FFAppState(); // Initialize FFAppState

  GetSocial.addOnInitializedListener(() => {
        // GetSocial SDK is ready to use
      });

  setupLocator();

  runApp(MyApp());

  locator<LandingPageData>().referralID = "defaultReferralID";

  registerListeners();
}

void registerListeners() {
  Invites.setOnReferralDataReceivedListener((received) {
    globalReferralData = received;
    print(globalReferralData);
    print(globalReferralData.linkParams);

    print("listener - socialdata");

    String passedReferralID =
        globalReferralData.linkParams['referralID'].toString();
    String passedCreatorID =
        globalReferralData.linkParams['creatorID'].toString();
    String passedCampaignID =
        globalReferralData.linkParams['\$campaign_id'].toString();

    print(passedReferralID);
    print(passedCreatorID);
    print(passedCampaignID);

    locator<NavigationService>()
      .navigatorKey
      .currentState
     .pushReplacementNamed('landingPage'); // how can I create a named Route?

    locator<LandingPageData>().referralID = passedReferralID;
    locator<LandingPageData>().creatorID = passedCreatorID;
    locator<LandingPageData>().campaignID = passedCampaignID;
  });
}