import * as React from "react";
/**
 * Merges multiple refs into a single callback ref.
 *
 * @remarks
 * This hook is essential when you need to attach multiple refs to the same element,
 * such as combining a forwarded ref with an internal ref for measurements or
 * imperative operations. All provided refs will receive the same element instance.
 *
 * Supports all ref types: callback refs, mutable ref objects, and `null`/`undefined`.
 * Inline callback refs create a new function identity on every render; wrap them
 * in `useCallback` before passing them here to avoid repeated ref synchronization.
 *
 * @typeParam T - The type of the element being referenced.
 * @param refs - Variadic refs to merge. Can include callback refs, ref objects, or undefined.
 * @returns A callback ref that updates all provided refs.
 *
 * @example
 * ```tsx
 * const MyComponent = React.forwardRef<HTMLDivElement, Props>((props, forwardedRef) => {
 *   const internalRef = useRef<HTMLDivElement>(null);
 *   const mergedRef = useMergedRefs(forwardedRef, internalRef);
 *
 *   return <div ref={mergedRef}>Content</div>;
 * });
 * ```
 */
export declare function useMergedRefs<T>(...refs: Array<React.Ref<T> | undefined>): React.RefCallback<T>;
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