extension property Null safety
@JsonKey(fromJson: _chatroomMessageExtensionFromMap, toJson: _chatroomMessageExtensionToMap), read / write
消息扩展
Implementation
@JsonKey(
fromJson: _chatroomMessageExtensionFromMap,
toJson: _chatroomMessageExtensionToMap,
)
NIMChatroomMessageExtension? extension;