export declare const SUB_HEADER_LAYOUT: readonly ["rows", "columns", "single-column"];
export type SubHeaderLayout = (typeof SUB_HEADER_LAYOUT)[number];
export type SubHeaderProperties = {
    /**
     * The header text to display in the sub-header.
     */
    header?: string;
    /**
     * The layout of the sub-header, either 'rows' or 'columns'.
     */
    layout?: SubHeaderLayout;
    /**
     * Number of items per row. Only applicable when layout is 'rows'.
     */
    rowsOf?: number;
};