/**
* Compose multiple AbortSignals into one. Aborts when any source aborts.
*
* Manual implementation — `AbortSignal.any` keeps strong references to the
* source signals on each composed signal (Node #57736), which leaks listeners
* when the source signals outlive individual requests (e.g. one app-wide
* AbortSignal shared across thousands of fetches). We attach `{ once: true }`
* listeners and detach them after the first source aborts or when the
* returned signal's controller is GC'd alongside the request.
*/
export declare function composeSignals(signals: (AbortSignal | undefined)[]): AbortSignal | undefined;
/**
* Build a timeout signal using native `AbortSignal.timeout`. Reason is a
* `TimeoutError`-style DOMException — used by `isOurTimeoutAbort` to tell
* "our timer fired" from "user aborted".
*/
export declare function timeoutSignal(ms: number): AbortSignal;
/**
* True when the signal aborted because *we* set a timeout (not the user).
*/
export declare function isOurTimeoutAbort(signal: AbortSignal | undefined): boolean;