added null safety for llc

packages/stream_chat/lib/src/models/user.dart

@@ -20,8 +20,8 @@ class User {
   });
 
   /// Create a new instance from a json
-  factory User.fromJson(Map<String, dynamic> json) => _$UserFromJson(
-      Serialization.moveToExtraDataFromRoot(json, topLevelFields));
+  factory User.fromJson(Map<String, dynamic>? json) => _$UserFromJson(
+      Serialization.moveToExtraDataFromRoot(json, topLevelFields)!);
 
   /// Use this named constructor to create a new user instance
   User.init(
@@ -49,47 +49,47 @@ class User {
   ];
 
   /// User id
-  final String id;
+  final String? id;
 
   /// User role
   @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
-  final String role;
+  final String? role;
 
   /// User role
   @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
-  final List<String> teams;
+  final List<String>? teams;
 
   /// Date of user creation
   @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
-  final DateTime createdAt;
+  final DateTime? createdAt;
 
   /// Date of last user update
   @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
-  final DateTime updatedAt;
+  final DateTime? updatedAt;
 
   /// Date of last user connection
   @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
-  final DateTime lastActive;
+  final DateTime? lastActive;
 
   /// True if user is online
   @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
-  final bool online;
+  final bool? online;
 
   /// True if user is banned from the chat
   @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
-  final bool banned;
+  final bool? banned;
 
   /// Map of custom user extraData
   @JsonKey(includeIfNull: false)
-  final Map<String, dynamic> extraData;
+  final Map<String, dynamic>? extraData;
 
   @override
   int get hashCode => id.hashCode;
 
   /// Shortcut for user name
-  String get name =>
-      (extraData?.containsKey('name') == true && extraData['name'] != '')
-          ? extraData['name']
+  String? get name =>
+      (extraData?.containsKey('name') == true && extraData!['name'] != '')
+          ? extraData!['name']
           : id;
 
   @override
@@ -103,15 +103,15 @@ class User {
 
   /// Creates a copy of [User] with specified attributes overridden.
   User copyWith({
-    String id,
-    String role,
-    DateTime createdAt,
-    DateTime updatedAt,
-    DateTime lastActive,
-    bool online,
-    Map<String, dynamic> extraData,
-    bool banned,
-    List<String> teams,
+    String? id,
+    String? role,
+    DateTime? createdAt,
+    DateTime? updatedAt,
+    DateTime? lastActive,
+    bool? online,
+    Map<String, dynamic>? extraData,
+    bool? banned,
+    List<String>? teams,
   }) =>
       User(
         id: id ?? this.id,