app_widget.dart

 MaterialApp.router(
            debugShowCheckedModeBanner: false,
            routerConfig: appRouter.router,
            localizationsDelegates: const [...],
            supportedLocales: const [...],
            builder: (context, child) {
              final client = getIt<StreamChatClient>();

              child = StreamChat(
                client: client,
                child: child,
              );
              child = botToastBuilder(context, child);

              return child;
            },
          ),