go_router_route.dart

// some_screen.dart
class SomeScreen extends StatelessWidget {
  static GoRoute route({
    List<GoRoute> routes = const <GoRoute>[],
  }) {
    return GoRoute(
      path: routeName,
      name: routeName,
      builder: (_, __) => const SomeScreen(),
      routes: routes,
    );
  }
  
  static const routeName = 'some_screen';
  
  @override
  Widget build(BuildContext context) {
    return ...
  }
}

// router.dart
GoRouter(
  debugLogDiagnostics: kDebugMode,
  routes: [
    SomeScreen.route(
      routes: HogeScreen.route(),
    ),
  ],
);