chore(llc): json annotation changes

Signed-off-by: xsahil03x <xdsahil@gmail.com>

packages/stream_chat/lib/src/core/models/attachment.dart

@@ -135,7 +135,6 @@ class Attachment extends Equatable {
   late final UploadState uploadState;
 
   /// Map of custom channel extraData
-  @JsonKey(includeIfNull: false)
   final Map<String, Object?> extraData;
 
   /// The attachment ID.

packages/stream_chat/lib/src/core/models/channel_model.dart

@@ -122,7 +122,6 @@ class ChannelModel {
   }
 
   /// Map of custom channel extraData
-  @JsonKey(includeIfNull: false)
   final Map<String, Object?> extraData;
 
   /// The team the channel belongs to

packages/stream_chat/lib/src/core/models/message.dart

@@ -131,7 +131,7 @@ class Message extends Equatable {
   final String? parentId;
 
   /// A quoted reply message.
-  @JsonKey(toJson: Serializer.readOnly)
+  @JsonKey(includeToJson: false)
   final Message? quotedMessage;
 
   final String? _quotedMessageId;
@@ -185,7 +185,7 @@ class Message extends Equatable {
   final bool pinned;
 
   /// Reserved field indicating when the message was pinned.
-  @JsonKey(toJson: Serializer.readOnly)
+  @JsonKey(includeToJson: false)
   final DateTime? pinnedAt;
 
   /// Reserved field indicating when the message will expire.
@@ -194,11 +194,10 @@ class Message extends Equatable {
   final DateTime? pinExpires;
 
   /// Reserved field indicating who pinned the message.
-  @JsonKey(toJson: Serializer.readOnly)
+  @JsonKey(includeToJson: false)
   final User? pinnedBy;
 
   /// Message custom extraData.
-  @JsonKey(includeIfNull: false)
   final Map<String, Object?> extraData;
 
   /// True if the message is a system info.
@@ -211,7 +210,7 @@ class Message extends Equatable {
   bool get isEphemeral => type == 'ephemeral';
 
   /// A Map of translations.
-  @JsonKey(includeIfNull: false)
+  @JsonKey(includeToJson: false)
   final Map<String, String>? i18n;
 
   /// Known top level fields.

packages/stream_chat/lib/src/core/models/message.g.dart

@@ -71,30 +71,16 @@ Message _$MessageFromJson(Map<String, dynamic> json) => Message(
       ),
     );
 
-Map<String, dynamic> _$MessageToJson(Message instance) {
-  final val = <String, dynamic>{
-    'id': instance.id,
-    'text': instance.text,
-    'attachments': instance.attachments.map((e) => e.toJson()).toList(),
-    'mentioned_users': User.toIds(instance.mentionedUsers),
-    'parent_id': instance.parentId,
-    'quoted_message': readonly(instance.quotedMessage),
-    'quoted_message_id': instance.quotedMessageId,
-    'show_in_channel': instance.showInChannel,
-    'silent': instance.silent,
-    'pinned': instance.pinned,
-    'pinned_at': readonly(instance.pinnedAt),
-    'pin_expires': instance.pinExpires?.toIso8601String(),
-    'pinned_by': readonly(instance.pinnedBy),
-    'extra_data': instance.extraData,
-  };
-
-  void writeNotNull(String key, dynamic value) {
-    if (value != null) {
-      val[key] = value;
-    }
-  }
-
-  writeNotNull('i18n', instance.i18n);
-  return val;
-}
+Map<String, dynamic> _$MessageToJson(Message instance) => <String, dynamic>{
+      'id': instance.id,
+      'text': instance.text,
+      'attachments': instance.attachments.map((e) => e.toJson()).toList(),
+      'mentioned_users': User.toIds(instance.mentionedUsers),
+      'parent_id': instance.parentId,
+      'quoted_message_id': instance.quotedMessageId,
+      'show_in_channel': instance.showInChannel,
+      'silent': instance.silent,
+      'pinned': instance.pinned,
+      'pin_expires': instance.pinExpires?.toIso8601String(),
+      'extra_data': instance.extraData,
+    };

packages/stream_chat/lib/src/core/models/reaction.dart

@@ -48,7 +48,6 @@ class Reaction {
   final String? userId;
 
   /// Reaction custom extraData
-  @JsonKey(includeIfNull: false)
   final Map<String, Object?> extraData;
 
   /// Map of custom user extraData

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

@@ -131,7 +131,6 @@ class User extends Equatable {
   final String? language;
 
   /// Map of custom user extraData.
-  @JsonKey(includeIfNull: false)
   final Map<String, Object?> extraData;
 
   /// List of users to list of userIds.

packages/stream_chat/lib/src/core/util/serializer.dart

@@ -1,12 +1,5 @@
-/// Used to avoid to serialize properties to json
-// ignore: prefer_void_to_null
-Null readonly(_) => null;
-
 /// Helper class for serialization to and from json
 class Serializer {
-  /// Used to avoid to serialize properties to json
-  static const Function readOnly = readonly;
-
   /// Takes unknown json keys and puts them in the `extra_data` key
   static Map<String, dynamic> moveToExtraDataFromRoot(
     Map<String, dynamic> json,