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Malte UblandClaude Opus 5.5
c7b2620e5c
events.once(emitter, name, { signal }) lowers to events.onceSignal, served
by a new runtime unit (scr_events_once_signal.c, linked only through the
eventsOnceSignal feature). It follows Node 24's lib/events.js: an
undefined signal is the plain form, a value that is not an AbortSignal
rejects with ERR_INVALID_ARG_TYPE, an aborted signal rejects with an
AbortError whose cause is signal.reason, and otherwise a once,
resist-stop-propagation 'abort' listener removes the event and 'error'
listeners and rejects. The event or the error removes the abort listener.
Options other than an object literal with one signal stay refused.
events.once now accepts stream receivers: a stream's runtime-emitted
events use their fixed tuples, and its 'data' and 'keypress' events stay
refused. A NodeJS stream interface slot that holds a stdio handle requests
the general stream representation.
Node's once is an async function that returns the executor's promise, so
its result adopts that promise through a thenable job. The plain form
settled its result two turns early; both forms now settle on Node's turn.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>