在我之前的方法中，我有一个Riverpod提供程序返回auth状态更改，我会简单地基于此在myapp的构建中进行重定向：

return user.when(
  data: (userData) {
    // if (userData != null) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,
      themeMode: activetheme,
      theme: MyThemes.lightTheme,
      darkTheme: MyThemes.darkTheme,
      home: const MyHomePage(),
    );
     } else {
      //if user is null they have opened the app for the first time so we send them to the Welcome Page
      return MaterialApp(
        title: 'Flutter Demo',
        debugShowCheckedModeBanner: false,
        themeMode: activetheme,
        theme: MyThemes.lightTheme,
        darkTheme: MyThemes.darkTheme,
        home: const WelcomePage(),
      );
    }*/
  },
  loading: () =>
      const CircularProgressIndicator(), // Replace with your loading widget
  error: (error, stackTrace) => ErrorWidget('Error: $error'),
);

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但现在我已经切换到GoRouter，我无法复制这一点，我试图做的是发送用户到他的着陆页，如果他们没有登录或至少匿名登录，我无法读取我的goRouter重定向构造函数内的AuthProvider，所以如何最好地做到这一点？

final goRouter = GoRouter(
  initialLocation: '/',
  navigatorKey: _rootNavigatorKey,
  debugLogDiagnostics: true,
  routes: [
    StatefulShellRoute.indexedStack(
      builder: (context, state, navigationShell) {
        return ScaffoldWithNestedNavigation(navigationShell: navigationShell);
      },
      branches: [
        StatefulShellBranch(
          navigatorKey: _shellNavigatorHomeKey,
          routes: [
            // Shopping Cart
            GoRoute(
              path: '/',
              builder: (BuildContext context, GoRouterState state) =>
                  const MyHomePage(),
              routes: [
                GoRoute(
                  path: 'settimer',
                  parentNavigatorKey: _rootNavigatorKey,
                  builder: (context, state) {
                    return SetTimer();
                  },
                ),
                GoRoute(
                  path: 'countdown',
                  parentNavigatorKey: _rootNavigatorKey,
                  builder: (context, state) {
                    return CountDownPage();
                  },
                ),
              ],
            ),
          ],
        ),
        StatefulShellBranch(
          navigatorKey: _shellNavigatorStatsKey,
          routes: [
            GoRoute(
              path: '/statspage',
              builder: (BuildContext context, GoRouterState state) =>
                  const StatsPage(),
            ),
          ],
        ),
        StatefulShellBranch(
          navigatorKey: _shellNavigatorMoreKey,
          routes: [
            GoRoute(
              path: '/morepage',
              builder: (BuildContext context, GoRouterState state) =>
                  const MorePage(),
            ),
          ],
        ),
      ],
    ),
  ],
);

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  SystemChrome.setPreferredOrientations([DeviceOrientation.portraitUp]);

  await Firebase.initializeApp(
    options: DefaultFirebaseOptions.currentPlatform,
  );
  usePathUrlStrategy();
  runApp(const ProviderScope(
    child: MyApp(),
  ));
}

class MyApp extends ConsumerWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final user = ref.watch(userAuthProvider);
//returns which theme is active light or dark
    final activetheme = ref.watch(thememodeProvider);
    return MaterialApp.router(
      title: 'Flutter Demo',
      routerConfig: goRouter,
      debugShowCheckedModeBanner: false,
      themeMode: activetheme,
      theme: MyThemes.lightTheme,
      darkTheme: MyThemes.darkTheme,
      //home: const MyHomePage(),
    );

型