/**
 * Error handling middleware for API
 */
import type { Request, Response, NextFunction } from 'express';
export { ApiError } from './types.js';
/**
 * Express error handling middleware
 */
export declare function errorHandler(err: Error, _req: Request, res: Response, _next: NextFunction): void;
/**
 * Async handler wrapper to catch promise rejections
 */
export declare function asyncHandler<T>(fn: (req: Request, res: Response, next: NextFunction) => Promise<T>): (req: Request, res: Response, next: NextFunction) => void;
/**
 * Validate required fields in request body
 */
export declare function validateRequired(body: Record<string, unknown>, fields: string[]): void;
/**
 * 404 handler for unmatched routes
 */
export declare function notFoundHandler(req: Request, res: Response, _next: NextFunction): void;
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