/**
 * check is `dom` inside parent with `classNames`
 * @param dom
 * @param classNames
 * @param parent
 */
export declare function isIn(dom: HTMLElement, classNames: string | string[], parent?: HTMLElement): any;
/**
 * check is `dom` inside something
 * @param dom
 * @param callback
 * @param parent
 */
export declare function isInBy(dom: HTMLElement, callback: (node: HTMLElement) => boolean, parent?: HTMLElement): any;