toJson method Null safety

Implementation

@override
Map<String, dynamic> toJson() {
  final json = <String, dynamic>{};
  json['type'] = type;
  json.addAll({
    'length': length,
    'gcRootType': gcRootType,
    'elements': elements?.map((f) => f.toJson()).toList(),
  });
  return json;
}