import { Observable, SchedulerLike } from 'rxjs';
import { ArrayOrIterable } from '../../util/ArrayOrIterable';
import { IChangeSet } from '../IChangeSet';
/**
 * Converts the observable to an observable changeset.
 * Change set observes observable change events.
 * @typeparam TObject The type of the object
 * @typeparam The type of the key
 * @param source The source
 * @param keySelector The key selector
 * @param expireAfter Specify on a per object level the maximum time before an object expires from a cache
 * @param limitSizeTo Remove the oldest items when the size has reached this limit
 * @param scheduler The scheduler (only used for time expiry)
 */
export declare function toObservableChangeSet<TObject, TKey>(source: Observable<ArrayOrIterable<TObject>>, keySelector: (value: TObject) => TKey, expireAfter?: (value: TObject) => number | undefined, limitSizeTo?: number, scheduler?: SchedulerLike): Observable<IChangeSet<TObject, TKey>>;