/**
 * Request context interface
 */
export interface RequestContext {
    /** Unique request identifier */
    requestId: string;
    /** Request timestamp */
    timestamp: string;
    /** Request path/endpoint */
    path?: string;
    /** HTTP method */
    method?: string;
    /** Request source IP */
    ip?: string;
    /** Custom request properties */
    [key: string]: unknown;
}
/**
 * Rate limiting configuration options
 */
export interface RateLimitConfig {
    /** Time window in milliseconds */
    windowMs: number;
    /** Maximum number of requests allowed in the window */
    maxRequests: number;
    /** Custom error message template */
    errorMessage?: string;
    /** Whether to skip rate limiting in certain environments (e.g. development) */
    skipInDevelopment?: boolean;
    /** Custom key generator function */
    keyGenerator?: (identifier: string, context?: RequestContext) => string;
    /** How often to run cleanup of expired entries (in milliseconds) */
    cleanupInterval?: number;
}
/**
 * Individual rate limit entry
 */
export interface RateLimitEntry {
    /** Current request count */
    count: number;
    /** When the window resets (timestamp) */
    resetTime: number;
    /** Key for this entry, stored for faster deletion */
    key: string;
}
/**
 * Generic rate limiter that can be used across the application
 */
export declare class RateLimiter {
    private config;
    /** Map storing rate limit data */
    private limits;
    /** Cleanup interval timer */
    private cleanupTimer;
    /** Default configuration */
    private static DEFAULT_CONFIG;
    /**
     * Create a new rate limiter
     * @param config Rate limiting configuration
     */
    constructor(config: RateLimitConfig);
    /**
     * Start the cleanup timer to periodically remove expired entries
     */
    private startCleanupTimer;
    /**
     * Clean up expired rate limit entries to prevent memory leaks
     */
    private cleanupExpiredEntries;
    /**
     * Update rate limiter configuration
     * @param config New configuration options
     */
    configure(config: Partial<RateLimitConfig>): void;
    /**
     * Get current configuration
     * @returns Current rate limit configuration
     */
    getConfig(): RateLimitConfig;
    /**
     * Reset all rate limits
     */
    reset(): void;
    /**
     * Check if a request exceeds the rate limit
     * @param key Unique identifier for the request source
     * @param context Optional request context
     * @throws {McpError} If rate limit is exceeded
     */
    check(key: string, context?: RequestContext): void;
    /**
     * Get rate limit information for a key
     * @param key The rate limit key
     * @returns Current rate limit status or null if no record exists
     */
    getStatus(key: string): {
        current: number;
        limit: number;
        remaining: number;
        resetTime: number;
    } | null;
    /**
     * Stop the cleanup timer when the limiter is no longer needed
     */
    dispose(): void;
}
/**
 * Create and export a default rate limiter instance
 */
export declare const rateLimiter: RateLimiter;
declare const _default: {
    RateLimiter: typeof RateLimiter;
    rateLimiter: RateLimiter;
};
export default _default;