I have following code with router setup. how can I register router observer. If I try to change to use MaterialApp(). The router doesnot work anymore. I use Auto_Route for navigation.

MaterialApp.router( title: 'Starter', theme: theme, locale: appManager.appLocale, supportedLocales: AppProvider.supportedLanguage, localizationsDelegates: const [ AppLocalizations.delegate, GlobalMaterialLocalizations.delegate, GlobalWidgetsLocalizations.delegate, GlobalCupertinoLocalizations.delegate, DefaultCupertinoLocalizations.delegate, ], routerDelegate: _appRouter.delegate(), routeInformationParser: _appRouter.defaultRouteParser(), )