import { type RefCallback, type RefObject } from 'react';
/** @internal */
export type ObservedSize = {
    width: number | undefined;
    height: number | undefined;
};
type UseResizeObserverOptions<T extends Element> = {
    ref?: RefObject<T | null> | T | null;
    onResize?: (size: ObservedSize) => void;
    box?: ResizeObserverBoxOptions;
};
type UseResizeObserverResult<T extends Element> = ObservedSize & {
    ref: RefCallback<T | null>;
};
/**
 * Observes an element's size using the native `ResizeObserver` API and returns
 * its dimensions. Accepts either a React ref or a direct element reference via
 * options; when neither is provided the returned `ref` callback should be
 * attached to the target element.
 *
 * Behaviour matches the `use-resize-observer` npm package: when `onResize` is
 * provided the hook skips state updates to avoid unnecessary re-renders.
 * @internal
 */
export declare function useResizeObserver<T extends Element = HTMLElement>(options?: UseResizeObserverOptions<T>): UseResizeObserverResult<T>;
export {};
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