sendMessage method Null safety

Future sendMessage(
  1. {required JMNormalMessage? message,
  2. JMMessageSendOptions? sendOption}
)

message 可能是 JMTextMessage | JMVoiceMessage | JMImageMessage | JMFileMessage | JMCustomMessage; NOTE: 不要传接收到的消息进去，只能传通过 createMessage 创建的消息。

Implementation

Future<dynamic> sendMessage(
    {required JMNormalMessage? message,
    JMMessageSendOptions? sendOption}) async {
  Map param = message?.target?.targetType.toJson();

  Map optionMap = {};

  if (sendOption != null) {
    optionMap = {
      'messageSendingOptions': sendOption.toJson()
        ..removeWhere((key, value) => value == null)
    };
  }

  param..addAll(optionMap)..addAll({'id': message?.id});
  Map resMap = await _channel.invokeMethod(
      'sendDraftMessage', param..removeWhere((key, value) => value == null));
  var res = JMNormalMessage.generateMessageFromJson(resMap);
  return res;
}