import { Middleware } from "../types/http.js";
/**
 * Middleware to cache HTTP responses for a specified duration.
 *
 * Stores responses in an in-memory cache and serves cached responses
 * for subsequent requests with the same method and URL, as long as the
 * cache entry is still valid (not expired).
 *
 * @param ttlSeconds - Time-to-live for the cache entry in seconds. Defaults to 60 seconds.
 * @returns A middleware function that handles caching logic.
 *
 * @example
 * app.use(cache(120)); // Cache responses for 2 minutes
 */
export declare function cache(ttlSeconds?: number): Middleware;
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