const sig = AbortSignal.any([AbortSignal.abort(), new AbortController().signal])
sig.aborted // → true (because first is already aborted)AbortSignal.any() creates a signal that aborts when any of the given signals abort.
AbortSignal.timeout(milliseconds) returns an AbortSignal that will abort after the given time.
Challenge: Verify that AbortSignal.timeout(1000) instanceof AbortSignal is truthy.