import React from "react";
/**
 * A React hook that fires a callback whenever ResizeObserver detects a change to its size
 *
 * @param target A React ref created by `useRef()` or an HTML element
 * @param callback Invoked with a single `ResizeObserverEntry` any time
 *   the `target` resizes
 */
declare function useResizeObserver<T extends Element>(target: React.RefObject<T> | React.ForwardedRef<T> | T | null, callback: UseResizeObserverCallback, options?: UseResizeObserverOptions): void;
export type UseResizeObserverCallback = (entry: ResizeObserverEntry, observer: ResizeObserver) => any;
export type UseResizeObserverOptions = {
    polyfill?: any;
};
export default useResizeObserver;