import type { ObjectDirective } from 'vue';
import type { Obj } from './utils';
export declare const virtualList: ObjectDirective<HTMLElement, {
    target: string;
    virtualStore: VirtualStore;
}>;
export type VirtualStoreOptions = {
    sourceData: Obj[];
    expandedKeys: any[];
    itemHeight: number;
    valueProp: any | ((node: Obj) => any);
    childrenProp: string;
};
export declare class VirtualStore {
    private readonly options;
    data: Obj[];
    constructor(options: VirtualStoreOptions);
    setOptions(options: Partial<VirtualStoreOptions>): void;
    setScrollTop(scrollTop?: number): void;
    scrollElem: HTMLElement;
    mount(el: HTMLElement): void;
    readonly sketchTopElem: HTMLDivElement;
    readonly sketchBottomElem: HTMLDivElement;
    private scrollTop;
    private clientHeight;
    updateScroll(scrollTop?: number, clientHeight?: number, callback?: () => any): void;
}