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EventPayload

EventPayload<Protocol, EventName> = Protocol extends undefined ? any[] : Protocol[EventName] extends (...payload) => Promise<void> | void ? Payload extends any[] ? Payload : never : never

Tuple of arguments for Base.post after the event name, inferred from the handler signature.

Type Parameters​

Protocol​

Protocol extends { } | undefined

Machine vocabulary interface

EventName​

EventName extends keyof Protocol

Event key whose parameter list is extracted

Remarks​

For open(): void, payload is []. For setTarget(celsius: number): void, payload is [number]. Service-shaped methods (leading resolve/reject) are not valid events — payload becomes never.