complain method Null safety

Future<void> complain(
  1. String callId,
  2. String description

Allows a user to complain about the call quality after a call ends.

Parameter callId ID of the call retrieved from the RtcEngine.getCallId method.

Parameter description (Optional) The description of the complaint. The string length must be less than 800 bytes.


Future<void> complain(String callId, String description) {
  return _invokeMethod('complain', {
    'callId': callId,
    'description': description,