make event model const

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

@@ -10,7 +10,7 @@ part 'event.g.dart';
 @JsonSerializable()
 class Event {
   /// Constructor used for json serialization
-  Event({
+  const Event({
     this.type,
     this.cid,
     this.connectionId,
@@ -27,16 +27,18 @@ class Event {
     this.channelId,
     this.channelType,
     this.parentId,
-    this.extraData,
+    this.extraData = const {},
-  }) : isLocal = true;
+    this.isLocal = true,
+  });
 
   /// Create a new instance from a json
-  factory Event.fromJson(Map<String, dynamic> json) =>
+  factory Event.fromJson(Map<String, dynamic> json) => _$EventFromJson({
-      _$EventFromJson(Serialization.moveToExtraDataFromRoot(
+        ...Serialization.moveToExtraDataFromRoot(
           json,
           topLevelFields,
-      ))
+        ),
-        ..isLocal = false;
+        'is_local': false,
+      });
 
   /// The type of the event
   /// [EventType] contains some predefined constant types
@@ -89,11 +91,11 @@ class Event {
 
   /// True if the event is generated by this client
   @JsonKey(ignore: true)
-  bool isLocal;
+  final bool isLocal;
 
   /// Map of custom channel extraData
-  @JsonKey(includeIfNull: false)
+  @JsonKey(defaultValue: {})
-  final Map<String, dynamic>? extraData;
+  final Map<String, dynamic> extraData;
 
   /// Known top level fields.
   /// Useful for [Serialization] methods.
@@ -114,7 +116,6 @@ class Event {
     'channel_id',
     'channel_type',
     'parent_id',
-    'is_local',
   ];
 
   /// Serialize to json

packages/stream_chat/lib/src/models/event.g.dart

@@ -38,12 +38,11 @@ Event _$EventFromJson(Map<String, dynamic> json) {
     channelId: json['channel_id'] as String?,
     channelType: json['channel_type'] as String?,
     parentId: json['parent_id'] as String?,
-    extraData: json['extra_data'] as Map<String, dynamic>?,
+    extraData: json['extra_data'] as Map<String, dynamic>? ?? {},
   );
 }
 
-Map<String, dynamic> _$EventToJson(Event instance) {
+Map<String, dynamic> _$EventToJson(Event instance) => <String, dynamic>{
-  final val = <String, dynamic>{
       'type': instance.type,
       'cid': instance.cid,
       'channel_id': instance.channelId,
@@ -60,18 +59,9 @@ Map<String, dynamic> _$EventToJson(Event instance) {
       'unread_channels': instance.unreadChannels,
       'online': instance.online,
       'parent_id': instance.parentId,
+      'extra_data': instance.extraData,
     };
 
-  void writeNotNull(String key, dynamic value) {
-    if (value != null) {
-      val[key] = value;
-    }
-  }
-
-  writeNotNull('extra_data', instance.extraData);
-  return val;
-}
-
 EventChannel _$EventChannelFromJson(Map<String, dynamic> json) {
   return EventChannel(
     members: (json['members'] as List<dynamic>?)