extension property Null safety

Map<String, dynamic>? extension
@JsonKey(fromJson: castPlatformMapToDartMap), final

获取聊天室通知扩展字段 该字段对应 NIMChatroomEnterRequest.notifyExtension

Implementation

@JsonKey(fromJson: castPlatformMapToDartMap)
final Map<String, dynamic>? extension;