import { NestedSelectOptions, NestedSelectState } from './nested-select.types';
/**
 * Headless nested (hierarchical) multiselect. Parents toggle all their children
 * and reflect a tri-state (`checked` / `partial` / `unchecked`); leaf options
 * toggle individually. Supports search filtering, full keyboard navigation and
 * ARIA wiring. State is reflected via `data-selected` / `data-state` and
 * `aria-selected` / `aria-checked`; positioning via floating-ui.
 *
 * Markup:
 * ```html
 * <div data-c42-nested-select>
 *   <button data-c42-nested-select-trigger><span data-c42-nested-select-value></span></button>
 *   <div data-c42-nested-select-panel>
 *     <input data-c42-nested-select-search />
 *     <ul data-c42-nested-select-list>
 *       <li data-c42-nested-select-group>
 *         <button data-c42-nested-select-parent>Fruits</button>
 *         <ul>
 *           <li data-c42-nested-select-option data-value="apple">Apple</li>
 *         </ul>
 *       </li>
 *     </ul>
 *   </div>
 * </div>
 * ```
 */
export declare class NestedSelect {
    private readonly root;
    private readonly trigger;
    private readonly panel;
    private readonly valueEl;
    private readonly searchInput;
    private readonly list;
    private readonly filterEnabled;
    private readonly placeholder;
    private readonly placement;
    private readonly offset;
    private readonly groups;
    private readonly options;
    private readonly selected;
    private open;
    private activeIndex;
    private stopAutoUpdate;
    private cleanups;
    constructor(root: HTMLElement, options?: NestedSelectOptions);
    private valueOf;
    private init;
    private get visibleOptions();
    private onListClick;
    private onSearch;
    private onKeydown;
    private updateActive;
    private filter;
    private toggleOption;
    private toggleGroup;
    private groupState;
    private render;
    private renderValue;
    private emitChange;
    private onOutside;
    toggle(): void;
    openPanel(): void;
    close(): void;
    /** Replace the current selection. */
    setValue(values: string[]): void;
    clear(): void;
    private position;
    get values(): string[];
    get isOpen(): boolean;
    getState(): NestedSelectState;
    on<E extends Event = Event>(event: string, handler: (event: E) => void): () => void;
    destroy(): void;
}