init firebase

packages/stream_chat_v1/lib/main.dart

@@ -4,10 +4,32 @@ import 'package:example/utils/app_config.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:sentry_flutter/sentry_flutter.dart';
+import 'package:firebase_core/firebase_core.dart';
+import 'package:firebase_messaging/firebase_messaging.dart';
+
 
 import 'package:example/app.dart';
 
-void main() async {
+import 'firebase_options.dart';
+
+@pragma('vm:entry-point')
+Future<void> _firebaseMessagingBackgroundHandler(RemoteMessage message) async {
+  print("#firebase; PN_2 ");
+  await Firebase.initializeApp();
+
+  // If you're going to use other Firebase services in the background, such as Firestore,
+  // make sure you call `initializeApp` before using other Firebase services.
+  print('[setupPushNotifications] newMessage: ${message.toMap()}');
+}
+
+Future<void> main() async {
+  WidgetsFlutterBinding.ensureInitialized();
+  print("#firebase; PN_1");
+  await Firebase.initializeApp();
+  Firebase.apps.forEach((it) {
+    print("#firebase; app: $it");
+  });
+  FirebaseMessaging.onBackgroundMessage(_firebaseMessagingBackgroundHandler);
   /// Captures errors reported by the Flutter framework.
   FlutterError.onError = (FlutterErrorDetails details) {
     if (kDebugMode) {