/**
 * * 新增配置项 `dvDirectionLine` 来配置瀑布图的各个数据项的方向指示线
 *
 * - 仅在 `dvType: 'waterfall'` 时生效
 * - 只考虑竖向瀑布图
 *
 * @example
 * ```javascript
 * {
 *   type: 'bar',
 *   dvType: 'waterfall',
 *   stack: 'waterfall'
 *   dvDirectionLine: {
 *     show: true,
 *     color: 'gray',
 *     direction: 'top'
 *   },
 * }
 * ```
 */
import { type EChartsExtensionInstallRegisters } from 'echarts/lib/extension';
export declare function install(registers: EChartsExtensionInstallRegisters): void;