export declare const NOOP: () => void;
export declare const isServerRendering: boolean;
export declare const on: (element: EventTarget | null, event: string, handler: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions) => void;
export declare const off: (element: EventTarget | null, event: string, handler: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions) => void;
export declare const contains: (root: HTMLElement, ele: any) => boolean;
export declare const isScrollElement: (element: HTMLElement) => boolean;
/**
 * 从当前节点向上查找所有的滚动元素
 * @param container 当前节点
 * @param top 查找到 top 节点就终止，不再继续查找
 * @returns
 */
export declare const getScrollElements: (container: HTMLElement, top?: HTMLElement) => HTMLElement[];
export declare function getContainer(container: any, defaultContainer: any): any;
export declare function ownerDocument(componentOrElement: any): Document;
export declare function calculatePosition(placement: any, overlayNode: any, target: HTMLElement, container: any, padding?: any): {
    positionLeft: number;
    positionTop: number;
    arrowOffsetLeft: number;
    arrowOffsetTop: number;
    activePlacement: string;
};
/**
 * 专门用来获取样式的像素值，默认返回 0
 */
export declare function getStyleNumber(element: HTMLElement, styleName: string): number;
export declare const getWindowSize: () => {
    width: number;
    height: number;
};