import { type DfConnectorData } from '../../../../../ng-draw-flow.interfaces';
/**
 * Draws a smooth-step SVG path between two connectors.
 *
 * @param startConnector   Data for the start connector.
 * @param endConnector     Data for the end connector.
 * @param radius           Radius of each bend (in pixels).
 * @returns                A tuple with an SVG `d` attribute and label coordinates.
 */
export declare function createSmoothStepPath(startConnector: DfConnectorData, endConnector: DfConnectorData, radius?: number): [path: string, labelX: number, labelY: number];