import { LitElement } from 'lit';
import type TabBar from '../tab-bar/tab-bar';
import type TabPanel from '../tab-panel/tab-panel';
export declare class TabGroupBase extends LitElement {
    tabPanels: NodeListOf<TabPanel> | null;
    tabBar: TabBar | null;
    activeTab: number;
    prevActiveTab: number;
    changeTab: (index: number) => void;
    deselectPreviousTab: () => void;
    selectNewTab: () => void;
    setupTabs: () => void;
    willUpdate(): void;
    render(): import("lit-html").TemplateResult<1>;
}