import { type EventEmitter } from '../../stencil-public-runtime';
import type { HeaderMegaMenuSelectDetail, MegaMenuColumn } from './mud-header.types';
/**
 * Header mega-menu — the full-width "Servicii" dropdown panel.
 *
 * Data-driven: pass `columns` (heading + list of links). Toggle visibility via
 * `open`; the consumer positions it directly beneath `mud-header` and wires it
 * to the matching `mud-header-nav-item`'s `mudNavToggle`.
 *
 * @element mud-header-mega-menu
 * @part mega-menu - The panel surface.
 */
export declare class MudHeaderMegaMenu {
    /** Columns of headings + links. */
    columns: readonly MegaMenuColumn[];
    /** Whether the panel is shown. */
    open: boolean;
    /** Accessible name for the panel (e.g. the triggering nav label). */
    ariaLabel?: string;
    /** Fired when an option is activated. */
    mudMegaMenuSelect: EventEmitter<HeaderMegaMenuSelectDetail>;
    private handleOptionClick;
    render(): any;
}