import { SxProps, Theme } from '@mui/material';
import { ReactNode } from 'react';
export interface SubheaderProps {
    sx?: SxProps<Theme>;
    children: ReactNode;
}
/**
 * Stateless layout: CSS grid `1fr auto`. Children self-place — typically
 * `<Widget.SelectionSummary />` (left) and `<Widget.Toolbox>` (right).
 */
export declare function Subheader({ sx, children }: SubheaderProps): import("react/jsx-runtime").JSX.Element;