The unique ID of the request.
Boolean indicating whether respond() has been called on the request previously.
The payload data for the request. The payload is immutable. Attempts to set / override payload values will silently fail. Attempts to mutate members of object-type payloads will silently fail as well.
Respond to the request with given data.
The name of the channel the request was sent through. The channel literal is immutable. Attempts to override the channel property