import { Ref } from 'react';
type OptRef<T> = Ref<T> | undefined;
/**
 * Compose two or more refs into a single callback ref. Returns `null` if all inputs are nullish,
 * or the lone non-nullish ref when only one is provided.
 *
 * Composed callbacks are cached pairwise in a WeakMap keyed by the input refs, so repeated calls
 * with the same inputs return the same callback identity - preserving referential stability across
 * renders without requiring callers to wrap in `useMemo` / `useCallback`.
 *
 * Adapted from the (now unmaintained) `@seznam/compose-react-refs` package by Seznam.cz,
 * https://github.com/seznam/compose-react-refs - MIT licensed.
 *
 * TODO (React 19): forward ref-callback cleanup returns and add a `useComposedRefs` hook variant
 * (using `useCallback`) so callers no longer rely on this util's WeakMap caching for stability.
 */
export declare function composeRefs<T>(...refs: [OptRef<T>, OptRef<T>, ...Array<OptRef<T>>]): Ref<T>;
export {};