support extraData null value

Author: sachaarbonel

packages/stream_feed/lib/src/core/models/enriched_activity.dart

@@ -62,7 +62,7 @@ class GenericEnrichedActivity<A, Ob, T, Or> extends Equatable {
     T Function(Object? json)? fromJsonT,
     Or Function(Object? json)? fromJsonOr,
   ]) =>
-      _$EnrichedActivityFromJson<A, Ob, T, Or>(
+      _$GenericEnrichedActivityFromJson<A, Ob, T, Or>(
         Serializer.moveKeysToRoot(json, topLevelFields)!,
         fromJsonA ??
             (jsonA) => (A == User)
@@ -176,7 +176,7 @@ class GenericEnrichedActivity<A, Ob, T, Or> extends Equatable {
 
   /// Map of custom user extraData
   @JsonKey(includeIfNull: false)
-  final Map<String, Object>? extraData;
+  final Map<String, Object?>? extraData;
 
   GenericEnrichedActivity<A, Ob, T, Or> copyWith({
     A? actor,
@@ -263,6 +263,6 @@ class GenericEnrichedActivity<A, Ob, T, Or> extends Equatable {
     Object? Function(Or value) toJsonOr,
   ) =>
       Serializer.moveKeysToMapInPlace(
-          _$EnrichedActivityToJson(this, toJsonA, toJsonOb, toJsonT, toJsonOr),
+          _$GenericEnrichedActivityToJson(this, toJsonA, toJsonOb, toJsonT, toJsonOr),
           topLevelFields);
 }

packages/stream_feed/lib/src/core/models/enriched_activity.g.dart

@@ -82,5 +82,5 @@
       }
     ]
   },
-  "test": "test"
+  "test": null
 }

packages/stream_feed/test/fixtures/enriched_activity.json

@@ -245,7 +245,7 @@ void main() {
       extraContext: const {'test': 'test'},
       origin: 'test',
       score: 1,
-      extraData: const {'test': 'test'},
+      extraData: const {'test': null},
       reactionCounts: const {'test': 1},
       ownReactions: {
         'test': [reaction1]
@@ -264,7 +264,7 @@ void main() {
     //that's why it's not explicit in the json fixture
     // all the extra data other than the default fields in json will ultimately
     // gets collected as a field extra_data of type Map
-    expect(enrichedActivityFromJson.extraData, {'test': 'test'});
+    expect(enrichedActivityFromJson.extraData, {'test': null});
   });
 
   test('EnrichedActivity with CollectionEntry object', () {