import { BaseApplicationCustomizer } from '@microsoft/sp-application-base';
import './MegaMenu.module.scss';
export declare const UserCustomActionMegaMenuId: string;
/**
 * Properties for the MegaMenu Application Customizer
 */
export interface IMegaMenuApplicationCustomizerProperties {
    /**
     * The name of the termset to load menu items from
     */
    termSetName: string;
    /**
     * Optional URL to an external CSS file
     */
    cssUrl?: string;
}
/** A Custom Action which can be run during execution of a Client Side Application */
export default class MegaMenuApplicationCustomizer extends BaseApplicationCustomizer<IMegaMenuApplicationCustomizerProperties> {
    private _topPlaceholder;
    onInit(): Promise<void>;
    private _renderPlaceHolders();
    private _updateCallback;
    private _renderMegaMenu(termSetName);
    private _getOrCreateContainer(id, placeholder);
    private _loadExternalCss(cssUrl);
    private _onDispose();
}