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在我将 pubspec.yaml 中的 fire_messaging 从 v6.0.0 升级到 11.2.3 后，我尝试将一个名为 fireflutter 的颤振包迁移到 null 安全版本，一些代码变成了红色。

 Future<void> _firebaseMessagingRequestPermission() async {
/// Ask permission to iOS user for Push Notification.
if (Platform.isIOS) {
  firebaseMessaging.onIosSettingsRegistered.listen((event) {
    
    // Do something after user accepts the request.
  });
  await firebaseMessaging
  .requestPermission(
    alert: true,
    announcement: false,
    badge: true,
    carPlay: false,
    criticalAlert: false,
    provisional: false,
    sound: true, );
      //.requestNotificationPermissions(IosNotificationSettings());//outdated
} else {
  /// For Android, no permission request is required. just get Push token.
  await firebaseMessaging.requestPermission();
}

}

错误：没有为“FirebaseMessaging”类型定义吸气剂“onIosSettingsRegistered”。(undefined_getter at [fireflutter] lib\base.dart:413)

    /// check if the app have the permission to access camera or photos
if (permissionStatus.isUndetermined || permissionStatus.isDenied) {
  /// request permission if not granted, or user haven't chosen permission yet.
  // print('requesting permisssion again');

  /// ? does not request permission again. (BUG: iOS) ??
  ///

  /// Ask permission.
  if (Platform.isAndroid) {
    await permission.request();
  }
}

错误：没有为类型“PermissionStatus”定义吸气剂“isUndetermined”。(undefined_getter at [fireflutter] lib\base.dart:944)

if (documentChange.type == DocumentChangeType.added) {
      // [createdAt] is null on author mobile (since FieldValue.serverTime make the event fire twice).
      if (post['createdAt'] == null) {
        forum.posts.insert(0, post);
      }

错误：没有为“对象”类型定义运算符“[]=”。(undefined_operator at [fireflutter] lib\fireflutter.dart:378)

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