import { Observable } from 'rxjs';
import { IChangeSet } from '../IChangeSet';
import { ArrayOrIterable } from '../../util/ArrayOrIterable';
export declare function combineCache<TObject, TKey>(operator: CombineOperator, items: ArrayOrIterable<Observable<IChangeSet<TObject, TKey>>>): Observable<IChangeSet<TObject, TKey>>;
export declare type CombineOperator = 'and' | 'or' | 'xor' | 'except';