/**
 * Hook used to focus the first tabbable element on mount.
 *
 * @param {boolean | 'firstElement'} focusOnMount Focus on mount mode.
 * @return {import('react').RefCallback<HTMLElement>} Ref callback.
 *
 * @example
 * ```js
 * import { useFocusOnMount } from '@gechiui/compose';
 *
 * const WithFocusOnMount = () => {
 *     const ref = useFocusOnMount()
 *     return (
 *         <div ref={ ref }>
 *             <Button />
 *             <Button />
 *         </div>
 *     );
 * }
 * ```
 */
export default function useFocusOnMount(focusOnMount?: boolean | 'firstElement'): import('react').RefCallback<HTMLElement>;
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