/**
 * AbortSignal composition helpers.
 *
 * @module utils/abortSignals
 */
export interface CombinedAbortSignal {
    signal: AbortSignal;
    /** Remove listeners from the source signals. Call once the request settles. */
    cleanup: () => void;
}
/**
 * Compose several AbortSignals into one that aborts when any input aborts,
 * propagating the reason of whichever fired first.
 *
 * Deliberately does NOT use `AbortSignal.any`: that shipped in Chrome 116 /
 * Safari 17.4, newer than the browsers this SDK is consumed from, and it is a
 * runtime API so no transpile step can backfill it. Calling it directly threw
 * `TypeError: AbortSignal.any is not a function` before `fetch` was ever
 * reached, which failed UTXO fetches, fee estimation and transaction broadcast
 * outright on those browsers.
 */
export declare function combineAbortSignals(signals: AbortSignal[]): CombinedAbortSignal;
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