/**
 * Rate limiting utilities for SSR applications.
 *
 * Protects against DoS attacks and abuse.
 */
export interface RateLimitConfig {
    /** Maximum requests per window */
    max: number;
    /** Time window in milliseconds */
    windowMs: number;
    /** Key generator function (default: IP address) */
    keyGenerator?: (request: any) => string;
    /** Custom error message */
    message?: string;
    /** HTTP status code for rate limit exceeded */
    statusCode?: number;
}
/**
 * In-memory rate limiter (use Redis in production for distributed systems).
 */
export declare class RateLimiter {
    private config;
    private requests;
    private cleanupInterval;
    constructor(config: RateLimitConfig);
    /**
     * Check if request is within rate limit.
     * @returns { allowed: boolean, remaining: number, resetTime: number }
     */
    check(key: string): {
        allowed: boolean;
        remaining: number;
        resetTime: number;
        retryAfter?: number;
    };
    /**
     * Clean up expired entries.
     */
    private cleanup;
    /**
     * Destroy the rate limiter and clean up resources.
     * Call this when shutting down the server.
     */
    destroy(): void;
}
/**
 * Fastify plugin for rate limiting.
 */
export declare function fastifyRateLimit(fastify: any, config: RateLimitConfig): void;
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