import { Observable } from 'rxjs';
import { TreeNodeDragEvent } from './treenodedragevent';
import * as i0 from "@angular/core";
export declare class TreeDragDropService {
    private dragStartSource;
    private dragStopSource;
    dragStart$: Observable<TreeNodeDragEvent>;
    dragStop$: Observable<TreeNodeDragEvent>;
    startDrag(event: TreeNodeDragEvent): void;
    stopDrag(event: TreeNodeDragEvent): void;
    static ɵfac: i0.ɵɵFactoryDef<TreeDragDropService, never>;
    static ɵprov: i0.ɵɵInjectableDef<TreeDragDropService>;
}