import { Observable } from 'rxjs';
import { Node } from '../Node';
import { ChangeSetOperatorFunction } from '../ChangeSetOperatorFunction';
/**
 * Transforms the object to a fully recursive tree, create a hiearchy based on the pivot function
 * @typeparam TObject The type of the object.
 * @typeparam TKey The type of the key.
 * @param pivotOn The pivot on.
 * @param predicateChanged Observable to change the underlying predicate.
 */
export declare function transformToTree<TObject, TKey>(pivotOn: (value: TObject) => TKey, predicateChanged?: Observable<(node: Node<TObject, TKey>) => boolean>): ChangeSetOperatorFunction<TObject, TKey, Node<TObject, TKey>, TKey>;