/**
 * Rate Limiter
 * Prevents abuse by limiting requests per agent
 */
export interface RateLimitConfig {
    requestsPerMinute: number;
    requestsPerHour: number;
    blockDuration?: number;
}
export declare class RateLimiter {
    private limits;
    private cleanupInterval;
    constructor();
    /**
     * Check if request is allowed
     */
    checkLimit(identifier: string, config: RateLimitConfig): {
        allowed: boolean;
        remaining: {
            perMinute: number;
            perHour: number;
        };
        resetAt?: number;
    };
    /**
     * Reset limits for an identifier
     */
    reset(identifier: string): void;
    /**
     * Get current usage for an identifier
     */
    getUsage(identifier: string): {
        minuteRequests: number;
        hourRequests: number;
        blockedUntil?: number;
    };
    /**
     * Cleanup old entries
     */
    private cleanup;
    /**
     * Destroy rate limiter
     */
    destroy(): void;
}
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