/**
 * Rate Limiting Middleware for MCP Gateway
 *
 * Implements SEC-04: MCP Gateway Rate Limiting
 * - Enforces 120 requests/minute per API key (configurable)
 * - In-memory Map-based implementation (no Redis dependency)
 * - Cleans up expired entries to prevent memory leaks
 * - Returns 429 with Retry-After header on limit exceeded
 *
 * Implements SEC-06: API Key Logging Restrictions
 * - Never logs full API key value
 * - Uses first 8 chars for identification
 */
import type { Request, Response, NextFunction } from "express";
/**
 * Rate limiting middleware
 */
export declare function rateLimitMiddleware(req: Request, res: Response, next: NextFunction): void;
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