extension property Null safety

NIMChatroomMessageExtension? extension

@JsonKey(fromJson: _chatroomMessageExtensionFromMap, toJson: _chatroomMessageExtensionToMap), read / write

Message extension

Implementation

@JsonKey(
  fromJson: _chatroomMessageExtensionFromMap,
  toJson: _chatroomMessageExtensionToMap,
)
NIMChatroomMessageExtension? extension;