import { OperatorFunction, SchedulerLike } from 'rxjs';
import { IChangeSet } from '../IChangeSet';
/**
 * Automatically removes items from the stream after the time specified by
 * the timeSelector elapses.  Return null if the item should never be removed
 * @typeparam TObject The type of the object.
 * @typeparam TKey The type of the key.
 * @param timeSelector The time selector.
 * @param timerInterval The time interval.
 * @param scheduler The scheduler.
 */
export declare function forExpiry<TObject, TKey>(timeSelector: (value: TObject) => number | undefined, timerInterval?: number | undefined, scheduler?: SchedulerLike): OperatorFunction<IChangeSet<TObject, TKey>, Iterable<readonly [TKey, TObject]>>;