import { GalleryOptions } from './gallery.types';
/**
 * Headless gallery / lightbox. Thumbnails open a navigable overlay with
 * prev/next, keyboard support, focus trapping and scroll locking.
 *
 * Markup:
 * ```html
 * <div data-c42-gallery>
 *   <button data-c42-gallery-item data-src="full-1.jpg"><img src="thumb-1.jpg" alt="One" /></button>
 *   <div data-c42-gallery-lightbox>
 *     <div data-c42-gallery-overlay></div>
 *     <img data-c42-gallery-image alt="" />
 *     <button data-c42-gallery-prev>Prev</button>
 *     <button data-c42-gallery-next>Next</button>
 *     <button data-c42-gallery-close>Close</button>
 *   </div>
 * </div>
 * ```
 */
export declare class Gallery {
    private readonly root;
    private readonly lightbox;
    private readonly image;
    private readonly items;
    private readonly loop;
    private readonly closeOnEscape;
    private readonly lockScroll;
    private readonly focusTrap;
    private open;
    private currentIndex;
    private previouslyFocused;
    private cleanups;
    constructor(root: HTMLElement, options?: GalleryOptions);
    private srcOf;
    private altOf;
    private init;
    private bind;
    private readonly onKeydown;
    private show;
    openAt(index: number): void;
    close(): void;
    next(): void;
    prev(): void;
    get index(): number;
    get isOpen(): boolean;
    on<E extends Event = Event>(event: string, handler: (event: E) => void): () => void;
    destroy(): void;
}