/**
 * Observes a HTMLElement and returns its bounding rect.
 * Updates when the element's size changes.
 *
 * If a ref to a HTMLElement is passed and ref.current is null it polls the ref to detect when
 * the HTMLElement value gets assigned to ref.current, this is useful in case the Component
 * using this hook does not rerender when ref.current changes.
 *
 * @param element - The HTMLElement, null, or a ref to an HTMLElement to observe
 * @param updateOnWindowResize - Whether to update the rect on window resize (default: false)
 * @param windowResizeThrottle - Throttle interval in ms for window resize updates (default: 0)
 * @returns The DOMRect of the element, or undefined if element is not available
 *
 * @example
 * ```ts
 * const ref = useRef<HTMLDivElement>(null);
 * const rect = useBoundingRect(ref);
 *
 * const [element, setElement] = useState<HTMLDivElement | null>(null);
 * const rect2 = useBoundingRect(element);
 *
 * // Update on window resize with 150ms throttle
 * const rect3 = useBoundingRect(ref, true, 150);
 * ```
 */
export declare const useBoundingRect: (element: HTMLElement | null | React.RefObject<HTMLElement | null>, updateOnWindowResize?: boolean, windowResizeThrottle?: number) => DOMRect | undefined;
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