/**
 * Observes an HTML element's height via `ResizeObserver` and reports the latest
 * measured height in CSS pixels.
 *
 * Returns a callback ref to attach to the target element and the current height.
 * Height is `0` while no element is attached. The observer is re-bound when the
 * attached node changes and disconnected on unmount.
 *
 * @example
 * ```tsx
 * const { ref, height } = useElementHeight<HTMLDivElement>();
 * return <div ref={ref}>{height}px</div>;
 * ```
 * @internal
 */
export declare function useElementHeight<T extends HTMLElement = HTMLElement>(): {
    ref: (node: T | null) => void;
    height: number;
};