import { LitElement } from 'lit';
export declare class StackBase extends LitElement {
    direction: 'row' | 'row-reverse' | 'column' | 'column-reverse';
    alignItems: 'flex-start' | 'center' | 'flex-end' | 'stretch' | 'baseline';
    justifyContent: 'flex-start' | 'center' | 'flex-end' | 'space-between' | 'space-around' | 'space-evenly';
    spacing: string;
    render(): import("lit-html").TemplateResult<1>;
}