/**
 * 给堆叠图的柱子中间加上空白缝隙, 处理柱子圆角的递进关系
 */
export declare function setStack(baseOption: any, iChartOption: any, legendData: any, seriesData: any): void;
/**
 * 将所有y轴的label都转为正数
 * 内置好转为正数的tooltip
 */
export declare function setDoubleSides(baseOption: any, iChartOption: any): void;
/**
 * 设置柱状图的方向
 */
export declare function setDirection(baseOption: any, direction: any): void;