import { LitElement } from 'lit';
/**
 * @tag md-button-group
 *
 * @slot - buttons
 */
export declare class M3StandardButtonGroup extends LitElement {
    #private;
    size: 'xs' | 's' | '';
    $buttons: Array<HTMLElement>;
    static styles: any[];
    render(): import("lit-html").TemplateResult<1>;
    constructor();
    connectedCallback(): void;
    firstUpdated(): Promise<void>;
    disconnectedCallback(): void;
    /**
     * Passing no element resets all shape changes
     */
    updateLayout(target?: HTMLElement | null): void;
}
declare global {
    interface HTMLElementTagNameMap {
        'md-button-group': M3StandardButtonGroup;
    }
}