rename package folders

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

@@ -0,0 +1,49 @@
+import 'user.dart';
+
+/// Used to avoid to serialize properties to json
+Null readonly(_) => null;
+
+/// Helper class for serialization to and from json
+class Serialization {
+  /// Used to avoid to serialize properties to json
+  static const Function readOnly = readonly;
+
+  /// List of users to list of userIds
+  static List<String> userIds(List<User> users) {
+    return users?.map((u) => u.id)?.toList();
+  }
+
+  /// Takes unknown json keys and puts them in the `extra_data` key
+  static Map<String, dynamic> moveToExtraDataFromRoot(
+    Map<String, dynamic> json,
+    List<String> topLevelFields,
+  ) {
+    if (json == null) return null;
+
+    final jsonClone = Map<String, dynamic>.from(json);
+
+    final extraDataMap = Map<String, dynamic>.from(json)
+      ..removeWhere(
+        (key, value) => topLevelFields.contains(key),
+      );
+    final rootFields = jsonClone
+      ..removeWhere((key, value) => extraDataMap.keys.contains(key));
+    return rootFields
+      ..addAll({
+        'extra_data': extraDataMap,
+      });
+  }
+
+  /// Takes values in `extra_data` key and puts them on the root level of the json map
+  static Map<String, dynamic> moveFromExtraDataToRoot(
+    Map<String, dynamic> json,
+    List<String> topLevelFields,
+  ) {
+    final jsonClone = Map<String, dynamic>.from(json);
+    return jsonClone
+      ..addAll({
+        if (json['extra_data'] != null) ...json['extra_data'],
+      })
+      ..remove('extra_data');
+  }
+}