export interface ViewportOffsetResult {
    left: number;
    top: number;
    right: number;
    bottom: number;
    rightIncludeBody: number;
    bottomIncludeBody: number;
}
export declare function getPopupContainer(node?: HTMLElement): HTMLElement;
export declare function getBoundingClientRect(element: Element): DOMRect | number;
export declare function hasClass(el: Element, cls: string): boolean;
export declare function addClass(el: Element, cls: string): void;
export declare function removeClass(el: Element, cls: string): void;
/**
      获取当前元素的左上偏移
  * left：最左边的元素到文档左边的距离
  * top：元素顶部到文档顶部的距离
  * right：元素最右边到文档右边的距离
  * bottom：元素底部到文档底部的距离
  * rightIncludeBody：文档最左边的元素到右边的距离
  * bottomIncludeBody：元素底部到文档底部的距离
 *
 * @description:
 */
export declare function getViewportOffset(element: Element): ViewportOffsetResult;
export declare function on(element: Element | HTMLElement | Document | Window, event: string, handler: EventListenerOrEventListenerObject): void;
export declare function off(element: Element | HTMLElement | Document | Window, event: string, handler: Fn): void;