import type { ErrorRequestHandler, NextFunction, Request, RequestHandler, Response } from "express";
export type AsyncRouteHandler = (req: Request, res: Response, next: NextFunction) => unknown | Promise<unknown>;
/** Forward both synchronous throws and rejected route promises to Express. */
export declare function asyncRoute(handler: AsyncRouteHandler): RequestHandler;
/** Keep API failures JSON-shaped, including body-parser and async route errors. */
export declare const jsonErrorHandler: ErrorRequestHandler;