import { IObservable } from '../base';
import { DisposableStore } from '../commonFacade/deps';
/**
 * Wraps an observable so that its source remains observed for a grace period
 * after the wrapping observable loses all its observers.
 *
 * When the wrapping observable has observers, an autorun keeps `obs` observed
 * and forwards changes. When the last observer is removed, `obs` stays observed
 * via `keepObserved` for `maxIdleTimeMs` before being released. If a new observer
 * arrives during the grace period, the keep-alive is cancelled seamlessly.
 *
 * @param store - Controls the hard lifetime; disposing it cancels any pending grace period.
 * @param obs - The source observable to keep alive longer.
 * @param maxIdleTimeMs - Grace period in milliseconds.
 */
export declare function deferUnobserve<T>(store: DisposableStore, obs: IObservable<T>, maxIdleTimeMs: number): IObservable<T>;
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