events.once(emitter, name) was refused. The emitter dispatches statically
emitted events to typed listeners through invokers built per argument
tuple, so the lowering takes the event's tuple from the program-wide event
table and builds a capture-free function that boxes that tuple into the
any[] Node fulfills with, and one for the 'error' tuple.
scr_events_once registers both as one-shot typed listeners behind emitted
adapters (emitterOnceAdapter). The first to fire settles the promise
(fulfilled with the arguments, or rejected with the error) and removes
the other, as in Node; awaiting 'error' itself registers only the one
listener. The shared state holds the emitter and the listener closures
weakly, so a never-fired once creates no cycle.
Options, computed or meta event names, EventTarget and stream receivers,
and events emitted with computed names or checked-dynamic listeners stay
refused. The fallback declarations type the result Promise<unknown[]>;
under @types/node (Promise<any[]>) TypeScript code narrows it to
unknown[].
Chris Tate
816c664058