import type { LayoutData } from '../../types.js';
export type SwimlaneDirection = 'TB' | 'LR' | 'BT' | 'RL';
/**
 * Pure swimlane layout core shared by browser rendering and DDLT.
 *
 * The browser measures DOM nodes before this runs; DDLT injects captured sizes
 * before calling the same function.
 */
export declare function runSwimlaneLayoutCore(data4Layout: LayoutData): SwimlaneDirection;