Serialized argument tuple type, or null when there are no args.
true for handle/handleOnce, false for listen/listenOnce/stream.
Optionalistrue for stream, which generates an IpcStream method.
Channel key (before prefixing), e.g. "get-all".
Serialized (awaited) return type; the yielded chunk type for streams;
"any" for listeners.
A single analyzed channel of an IPC module.