export type ElementSize = {
    width: number;
    height: number;
};
export declare const EMPTY_ELEMENT_SIZE: ElementSize;
/**
 * Observes an element's border-box size via ResizeObserver.
 *
 * Updates are coalesced with `requestAnimationFrame` to avoid layout thrash.
 * When `ResizeObserver` is unavailable, returns the last measured size (or
 * {@link EMPTY_ELEMENT_SIZE}) and still reads once on attach.
 */
export declare function useElementSize(): {
    ref: (node: Element | null) => void;
    size: ElementSize;
};
export default useElementSize;