/**
 * Combine several abort signals into one.
 *
 * The clock takes a single signal and several things can end a wait, a
 * shutdown, a re-probe request, an inner race. Composed here rather than
 * threaded through every sleep, and disposed so a long-lived signal does not
 * accumulate listeners from every wait that ever used it.
 *
 * One definition rather than two. `watcher.ts` and `gmail-source.ts` each held
 * a private copy, and the copy in `gmail-source.ts` said so in a comment,
 * accepted at the time on the grounds that a three-line utility restates
 * nothing about the shape of the system. That reasoning holds for the SHAPE
 * and not for the BEHAVIOUR: the disposal half is the easy half to get subtly
 * wrong, both sources hold long-lived signals across a poll loop, and a leak
 * fixed in one copy would have stayed in the other. There is nothing here for
 * either module to disagree about, so neither gets its own version.
 */
export declare function anySignal(signals: readonly AbortSignal[]): {
    readonly signal: AbortSignal;
    dispose(): void;
};
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