import type { MonoTypeOperatorFunction } from "rxjs";
/**
 * Returns an Observable that mirrors the source Observable, but will call a specified function when the source has no
 * more subscribers.
 *
 * This is exactly like the `finalize` operator, except that the specified function will be called only when the source
 * is explicitly unsubscribed.
 *
 * @param callback Called when the source Observable has no more subscribers.
 * @returns
 */
export declare function unsubscribed<T>(callback: () => void): MonoTypeOperatorFunction<T>;
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