import { RefObject } from 'react';
/** Opening search focuses the search slot; closing restores the previously focused
 * element (tracked via focusin — the invoker may already be unmounted), else the heading. */
export declare function useSearchFocus(hasSearch: boolean, searchOpen: boolean, searchAreaRef: RefObject<HTMLDivElement>, headingRef: RefObject<HTMLElement>): void;
/** Header is "stuck" (compact) once the sentinel above it scrolls out of view. */
export declare function useStuckOnScroll(sticky: boolean, sentinelRef: RefObject<HTMLDivElement>): boolean;
/** Writes the header's measured height as scroll-padding-top on the nearest scroll
 * container, so a sticky header never covers focused content. */
export declare function useStickyScrollPadding(sticky: boolean, containerRef: RefObject<HTMLDivElement>): void;
/** True while the 2-line clamp hides part of the title (drives the native tooltip). */
export declare function useIsTitleClamped(headingRef: RefObject<HTMLElement>, title: string, enabled: boolean): boolean;