/**
 * @pwngh/economy-lab
 *
 * Copyright (c) Preston Neal
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE.md file in the root directory of this source tree.
 *
 * @license MIT
 */
import type { Clock, RateLimiter } from '../ports.js';
/**
 * Builds an in-process {@link RateLimiter} counting fixed windows in a `Map`. It exposes the same
 * observable contract as the Redis adapter and serves as a usable single-process limiter when no
 * Redis is wired.
 *
 * Each key gets `limit` requests per `windowMs`, measured against the injected `clock`; a denial
 * reports how long until the window resets. An expired window is replaced only when its key is
 * next seen, so the map retains every key it has ever counted.
 *
 * @example
 * const limiter = memoryRateLimiter({ limit: 100, windowMs: 60_000 });
 * await limiter.allow('user:usr_42'); // { allowed: true }
 *
 * @see {@link https://economy-lab-docs.pages.dev/economy/reference/http-service/ HTTP service} for
 *   how the server keys and answers denials.
 */
export declare function memoryRateLimiter(options: {
    limit: number;
    windowMs: number;
}, clock?: Clock): RateLimiter;