import { CommandPaletteOptions } from './command-palette.types';
/**
 * Headless command palette (Cmd/Ctrl+K). Wires the combobox/listbox ARIA
 * pattern over existing markup, filters items as the user types, hides empty
 * groups, manages active-descendant keyboard navigation and dispatches a
 * select event. Applies no visual styles — only ARIA + `data-state`.
 *
 * Markup:
 * ```html
 * <div data-c42-command-palette>
 *   <div data-c42-command-overlay></div>
 *   <div data-c42-command-dialog>
 *     <input data-c42-command-input placeholder="Type a command…" />
 *     <div data-c42-command-list>
 *       <div data-c42-command-group data-label="Actions">
 *         <button data-c42-command-item data-value="new" data-keywords="create">New File</button>
 *       </div>
 *       <div data-c42-command-empty>No results</div>
 *     </div>
 *   </div>
 * </div>
 * ```
 */
export declare class CommandPalette {
    private readonly root;
    private readonly overlay;
    private readonly input;
    private readonly list;
    private readonly emptyEl;
    private readonly hotkey;
    private readonly closeOnOverlayClick;
    private readonly closeOnEscape;
    private readonly clearOnClose;
    private readonly filterFn;
    private readonly trap;
    private items;
    private visible;
    private activeIndex;
    private open;
    private previouslyFocused;
    private cleanups;
    constructor(root: HTMLElement, options?: CommandPaletteOptions);
    private init;
    private collect;
    private itemText;
    private readonly onHotkey;
    private onInputKeydown;
    private applyFilter;
    private move;
    private setActive;
    private selectItem;
    /** Open the palette and focus the search input. */
    openPalette(): void;
    /** Close the palette and restore focus. */
    close(): void;
    toggle(): void;
    get isOpen(): boolean;
    /** Currently active (highlighted) item, or null. */
    get activeItem(): HTMLElement | null;
    /** Subscribe to a DOM event on the root element. Returns an unsubscribe fn. */
    on<E extends Event = Event>(event: string, handler: (event: E) => void): () => void;
    destroy(): void;
}