import { GroupMode, Layout } from '../types/categorical-bar-chart.js';
/**
 * Boolean if Layout value is vertical or horizontal
 * @param layout - vertical or horizontal values
 * @returns true if layout has vertical value
 */
export declare function isVertical(layout: Layout): layout is "vertical";
/**
 * Boolean if groupMode value is stacked
 * @param groupMode - grouped or stacked values
 * @returns true if groupMode has stacked value
 */
export declare function isStacked(groupMode: GroupMode): groupMode is "stacked";
/**
 * Boolean if groupMode value is grouped
 * @param groupMode - grouped or stacked values
 * @returns true if groupMode has stacked value
 */
export declare function isGrouped(groupMode: GroupMode): groupMode is "grouped";