import { type RefObject } from 'react';
/**
 * Determine if a child element of the provided ref is currently focussed.
 * @param containerRef The ref to the container element.
 * @param onFocusChange The callback to be called when the focus state changes.
 * @type T The type of the container element.
 * @returns The ref to be applied to the container element.
 */
export declare const useContainsFocus: <T extends HTMLElement>(containerRef?: RefObject<T | null>, onFocusChange?: (isFocussed: boolean) => void) => void;