/**
 * Checks on an interval to see if the element is scrolling.
 * When the scrolling has finished it then calls the function.
 *
 * @param el The element that scrolls.
 * @param fn The function to call after scrolling completes.
 * @return A function to cancel the scroll listener.
 */
export declare function onScrollEnd(el: HTMLElement, fn: (offet: number) => void): () => void;