fromTimer()

Creates a raw callbag source that emits undefined once after a delay, then completes (END). If the signal is already aborted or aborts during the delay, sends END with the abort reason as an error (no DATA emitted).

Use with rawSubscribe to replace raw new Promise + setTimeout. Use firstValueFrom only at system boundaries when exiting callbag-land.

Signature

function fromTimer(ms: number, signal?: AbortSignal): CallbagSource

Parameters

Parameter	Type	Description
ms	number	Delay in milliseconds.
signal	AbortSignal	Optional AbortSignal to cancel the delay early.

Returns

A raw callbag source function.