/**
 * API Middleware
 */
import { Request, Response, NextFunction } from 'express';
/**
 * Request logging middleware
 */
export declare function requestLogger(req: Request, _res: Response, next: NextFunction): void;
/**
 * Error handling middleware
 */
export declare function errorHandler(error: Error, _req: Request, res: Response, _next: NextFunction): void;
/**
 * Not found handler
 */
export declare function notFoundHandler(_req: Request, res: Response): void;
/**
 * CORS middleware
 */
export declare function corsMiddleware(_req: Request, res: Response, next: NextFunction): void;
/**
 * Rate limiting middleware (simplified)
 */
export declare function rateLimiter(maxRequests?: number, windowMs?: number): (req: Request, res: Response, next: NextFunction) => void;
/**
 * API key authentication middleware (simplified)
 */
export declare function apiKeyAuth(apiKeys: Set<string>): (req: Request, res: Response, next: NextFunction) => void;
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