import type { MutableRefObject, Ref, RefCallback } from "react";
/**
 * Produces a unique ID that can be used for the HTML `id` attribute. Will use
 * the provided value if defined (typically obtained from the calling
 * component's `id` prop), otherwise one will be generated. The ID will remain
 * the same between renders (even if `idProp` changes).
 */
export declare function useId(idProp?: string): string;
/**
 * Combines multiple refs into a single ref.
 *
 * Useful when a component needs a ref to one of its own elements, but also
 * supports forwarding a ref from its parent component.
 */
export declare function mergeRefs<T>(...refs: (RefCallback<T> | MutableRefObject<T | null> | null)[]): Ref<T>;
/**
 * Returns the previous value of updated props or state.
 *
 * @param value The original value of the property.
 */
export declare function usePrevious<T = unknown>(value: T | undefined): T | undefined;
/**
 * A simple, unoptimized implementation of useResizeObserver.
 *
 * @param target The node to observe.
 * @param callback Called when a change is observed.
 */
export declare function useResizeObserver<T extends HTMLElement = HTMLElement>(target: T, callback: (entry: ResizeObserverEntry) => void): void;
/**
 * Gets the dimensions of an element.
 *
 * @param target A ref to the target element.
 */
export declare function useContentRect<T extends HTMLElement = HTMLElement>(target: React.RefObject<T | undefined> | React.MutableRefObject<T | undefined> | T): DOMRectReadOnly;
/**
 * Executes a function once when the component is first mounted. The function
 * will never run again unless the component is unmounted and subsequently
 * mounted again.
 *
 * @param f The function to execute. If the function is async, it's the caller's
 *   responsibility to verify that the component is still mounted after awaiting
 *   any promises (e.g. using `useIsMounted`).
 */
export declare function useMount(f: () => void | Promise<void>): void;
/**
 * Executes a function once when the component is dismounted.
 *
 * @param f The function to execute.
 */
export declare function useDismount(f: () => void): void;