@juspay/neurolink/dist/lib/server/middleware/rateLimit.d.ts

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/**
 * Rate Limiting Middleware
 * Provides configurable rate limiting for server adapters
 */
import type { FixedWindowRateLimitConfig, MiddlewareDefinition, RateLimitEntry, RateLimitMiddlewareConfig, RateLimitStore } from "../../types/index.js";
/**
 * In-memory rate limit store
 */
export declare class InMemoryRateLimitStore implements RateLimitStore {
    private store;
    private cleanupInterval?;
    constructor();
    get(key: string): Promise<RateLimitEntry | undefined>;
    set(key: string, entry: RateLimitEntry): Promise<void>;
    increment(key: string, windowMs: number): Promise<RateLimitEntry>;
    reset(key: string): Promise<void>;
    private cleanup;
    destroy(): void;
}
/**
 * Create rate limiting middleware
 *
 * Response headers set on all requests:
 * - `X-RateLimit-Limit`: Maximum requests allowed per window
 * - `X-RateLimit-Remaining`: Requests remaining in current window
 * - `X-RateLimit-Reset`: Unix timestamp when the window resets
 *
 * Additional headers on rate limit exceeded (HTTP 429):
 * - `Retry-After`: Seconds to wait before retrying
 *
 * @example
 * ```typescript
 * const rateLimiter = createRateLimitMiddleware({
 *   maxRequests: 100,
 *   windowMs: 15 * 60 * 1000, // 15 minutes
 *   skipPaths: ["/api/health"],
 * });
 *
 * server.registerMiddleware(rateLimiter);
 * ```
 */
export declare function createRateLimitMiddleware(config: RateLimitMiddlewareConfig): MiddlewareDefinition;
/**
 * Re-export RateLimitError from errors for convenience
 */
export { RateLimitError } from "../errors.js";
/**
 * Create a sliding window rate limiter
 * More accurate than fixed window but slightly more complex
 */
export declare function createSlidingWindowRateLimitMiddleware(config: RateLimitMiddlewareConfig & {
    /** Number of sub-windows for smoothing (default: 10) */
    subWindows?: number;
}): MiddlewareDefinition;
/**
 * Alias for InMemoryRateLimitStore for compatibility
 */
export { InMemoryRateLimitStore as MemoryRateLimitStore };
/**
 * Create fixed window rate limit middleware
 *
 * Accepts config and optional store as separate parameters for compatibility.
 * Returns rate limit headers in the response object.
 *
 * @example
 * ```typescript
 * const store = new MemoryRateLimitStore();
 * const middleware = createFixedWindowRateLimitMiddleware(
 *   { windowMs: 60000, maxRequests: 10 },
 *   store
 * );
 * ```
 */
export declare function createFixedWindowRateLimitMiddleware(config: FixedWindowRateLimitConfig, store?: RateLimitStore): MiddlewareDefinition;