/**
 * dsh-widgets — the 对话轨迹 lanes chart.
 *
 * The three-lane strip keeps the OFFICIAL 轨迹 geometry (see each constant below)
 * but stacks the lanes contiguously so they fill the card's remaining height.
 * Moved verbatim out of components.tsx (Phase 3.4), constants included: `lanes` is
 * their only consumer.
 */
import * as React from 'react';
import type { ChartProps } from './types';
export declare function LanesChart({ chart, side, width, pad, scale }: ChartProps): React.ReactElement | null;