import type { Ref } from 'react';
/**
 * Assign one value to any number of refs — callback refs, object refs, or
 * `null`/`undefined` slots. Used when a component keeps an internal ref to its
 * root node and still has to honor the ref its consumer forwarded in.
 */
export declare function mergeRefs<T>(...refs: Array<Ref<T> | undefined>): (value: T | null) => void;
/**
 * Memoized {@link mergeRefs}. Keeps the composed callback stable while the
 * individual refs are unchanged, so React doesn't detach and re-attach the
 * node on every render.
 *
 * @example
 * const Component = forwardRef<View, Props>((props, ref) => {
 *   const internalRef = useRef<View>(null);
 *   return <View ref={useMergedRef(internalRef, ref)} />;
 * });
 */
export declare function useMergedRef<T>(...refs: Array<Ref<T> | undefined>): (value: T | null) => void;