/**
 * Rate Limiter Implementation
 *
 * Implements a sliding window rate limiter to control request rates
 */
export interface RateLimiterOptions {
    /** Maximum number of requests allowed in the time window */
    maxRequests: number;
    /** Time window in milliseconds */
    windowMs: number;
    /** Optional key generator function for identifying clients */
    keyGenerator?: (identifier: string) => string;
}
export declare class RateLimiter {
    private records;
    private options;
    private cleanupInterval;
    constructor(options: RateLimiterOptions);
    /**
     * Check if a request should be allowed
     * @param identifier - Client identifier (e.g., IP address, session ID)
     * @returns Object with allowed status and retry information
     */
    check(identifier: string): {
        allowed: boolean;
        remaining: number;
        resetTime: number;
        retryAfter?: number;
    };
    /**
     * Reset rate limit for a specific identifier
     */
    reset(identifier: string): void;
    /**
     * Clear all rate limit records
     */
    clear(): void;
    destroy(): void;
    /**
     * Clean up expired records
     */
    private cleanup;
}