parentId property
The optional id of the root post of the thread to which the user is replying. If unset, the typing event is directed at the entire channel.
Please note: This property should have been non-nullable! Since the specification file does not include a default value (using the "default:" property), however, the generated source code must fall back to having a nullable type. Consider adding a "default:" property in the specification file to hide this note.
Implementation
String? parentId;