import { DropdownOptions } from './dropdown.types';
/**
 * Headless dropdown/menu controller. Handles toggle, outside-click dismissal,
 * keyboard navigation, ARIA wiring and floating-ui positioning.
 *
 * Markup:
 * ```html
 * <div data-c42-dropdown>
 *   <button data-c42-dropdown-trigger>Open</button>
 *   <div data-c42-dropdown-menu>
 *     <button data-c42-dropdown-item>One</button>
 *     <button data-c42-dropdown-item>Two</button>
 *   </div>
 * </div>
 * ```
 */
export declare class Dropdown {
    private readonly root;
    private readonly trigger;
    private readonly menu;
    private readonly placement;
    private readonly offset;
    private readonly closeOnSelect;
    private open;
    private stopAutoUpdate;
    private cleanups;
    constructor(root: HTMLElement, options?: DropdownOptions);
    private get items();
    private init;
    private readonly onMenuClick;
    private onOutsidePointer;
    private onTriggerKeydown;
    private onMenuKeydown;
    private focusItem;
    toggle(): void;
    openMenu(): void;
    close(): void;
    private position;
    get isOpen(): boolean;
    on<E extends Event = Event>(event: string, handler: (event: E) => void): () => void;
    destroy(): void;
}