import { OnChanges, OnDestroy } from '@angular/core';
import { DragSource } from '@ng-dnd/core';
import { DraggedItem, SortableSpec } from '../types';
import * as i0 from "@angular/core";
export declare const EXTERNAL_LIST_ID: symbol;
export declare class DndSortableExternal<Data> implements OnChanges, OnDestroy {
    private dnd;
    private el;
    spec: SortableSpec<Data>;
    /**
     * This source has beginDrag and endDrag implemented in line with what dndSortableRender does.
     *
     * You must, like dndSortableRender, attach it with [dragSource] somewhere.
     */
    source: DragSource<DraggedItem<Data>>;
    /** @ignore */
    constructor();
    /** @ignore */
    private size;
    /** @ignore */
    ngOnChanges(): void;
    /** @ignore */
    ngOnDestroy(): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<DndSortableExternal<any>, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<DndSortableExternal<any>, "[dndSortableExternal]", ["dndSortableExternal"], { "spec": { "alias": "dndSortableExternal"; "required": false; }; }, {}, never, never, true, never>;
}