import { type RefObject } from "react";
import type { VoidFn } from "../../utils/types";
export type Entries = Array<ResizeObserverEntry>;
/**
 * Watches for size changes of an element using `ResizeObserver`.
 *
 * @remarks
 * This hook returns a ref to attach to the element.
 * The callback receives the `ResizeObserverEntry` array.
 * The callback can optionally return a cleanup function.
 *
 * @typeParam T - The element type.
 * @param cb - The callback to execute on resize.
 * @returns A ref object to attach to the target element.
 *
 * @example
 * ```tsx
 * const ref = useResizeObserver((entries) => {
 *   for (const entry of entries) {
 *     console.log(entry.contentRect);
 *   }
 * });
 * return <div ref={ref} />;
 * ```
 */
export declare function useResizeObserver<T extends Element>(cb: (e: Entries) => undefined | VoidFn): RefObject<T | null>;