import { Ref, ReactNode } from 'react';
/**
 * Clones valid React elements and applies additional props to them.
 *
 * @param children - The child nodes to process.
 * @param extraProps - Additional props to be passed to valid React elements.
 * @returns A ReactNode with extra props applied to valid elements, leaving others unchanged.
 */
export declare const applyPropsToChildren: (children: ReactNode, extraProps?: Record<string, any>) => ReactNode;
/**
 * Utility function to merge multiple refs into a single ref callback function.
 *
 * @param refs - Refs to be merged.
 * @returns A callback function that sets the value on all merged refs.
 */
export declare const mergeRefs: <T>(...refs: (Ref<T> | undefined)[]) => Ref<T>;