import { Observable, OperatorFunction } from 'rxjs';
import { DistinctChangeSet } from '../DistinctChangeSet';
import { IChangeSet } from '../IChangeSet';
import { Group } from '../IGroupChangeSet';
/**
 *   Groups the source on the value returned by group selector factory.
 *   A group is included for each item in the resulting group source.
 * @typeparam TObject">The type of the object
 * @typeparam TKey">The type of the key
 * @typeparam TGroupKey">The type of the group key
 * @param groupSelector The group selector factory.
 * @param resultGroupSource A distinct stream used to determine the result
 * @summary Useful for parent-child collection when the parent and child are soured from different streams
 **/
export declare function groupOnDistinct<TObject, TKey, TGroupKey>(groupSelector: (value: TObject) => TGroupKey, resultGroupSource: Observable<DistinctChangeSet<TGroupKey>>): OperatorFunction<IChangeSet<TObject, TKey>, IChangeSet<Group<TObject, TKey, TGroupKey>, TGroupKey>>;