/**
 * Rate Limiting Utility
 *
 * Provides rate limiting functionality using Cloudflare Workers Rate Limiting API
 */
export interface RateLimitConfig {
    limit: number;
    period: number;
    keyPrefix: string;
}
export interface RateLimitResult {
    success: boolean;
    limit: number;
    remaining: number;
    retryAfter?: number;
}
/**
 * Check rate limit for a request
 */
export declare function checkRateLimit(rateLimiter: any, // Cloudflare Rate Limiter binding
identifier: string, config: RateLimitConfig): Promise<RateLimitResult>;
/**
 * Create rate limit error response
 */
export declare function createRateLimitResponse(result: RateLimitResult): Response;
/**
 * Get rate limit identifier from request
 * Uses IP address, falling back to user ID if authenticated
 */
export declare function getRateLimitIdentifier(request: Request, userId?: string): string;
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