import { Observable, GroupedObservable, OperatorFunction } from "rxjs";
/** @deprecated split is deprecated and it will be removed in the next version, please use partitionByKey
 *
 * Groups the items emitted by the source based on the keySelector function,
 * emitting one Observable for each group.
 *
 * @param keySelector Function to define the group of an item
 */
export declare function split<T, K>(keySelector: (value: T) => K): OperatorFunction<T, GroupedObservable<K, T>>;
/** @deprecated split is deprecated and it will be removed in the next version, please use partitionByKey
 *
 * Groups the items emitted by the source based on the keySelector function,
 * emitting one Observable for each group.
 *
 * @param keySelector Function to define the group of an item
 * @param streamSelector Function to apply to each resulting group
 */
export declare function split<T, K, R>(keySelector: (value: T) => K, streamSelector: (grouped: Observable<T>, key: K) => Observable<R>): OperatorFunction<T, GroupedObservable<K, R>>;