/**
 * @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 { Cache, Clock } from '../ports.js';
/**
 * Builds an in-process {@link Cache} backed by a `Map`. It exposes the same observable contract as
 * the Redis adapter. The Cache conformance suite runs it as its oracle, the way `memoryStore` is the
 * reference for the Store. It also serves as a usable single-process cache when no Redis is wired.
 *
 * It honors `ttlMs` against the injected `clock`. An entry past its expiry reads as a miss, the same
 * way Redis's `PX` flag expires a key, so the conformance suite can drive expiry with a fake clock.
 * Values are opaque strings, and this never parses them.
 *
 * @example
 * const cache = memoryCache();
 * await cache.set('bal:usr_42:spendable', 'CREDIT:12.34', 60_000);
 * await cache.get('bal:usr_42:spendable'); // 'CREDIT:12.34' | null
 *
 * @see {@link https://economy-lab-docs.pages.dev/economy/ports/storage/ Storage} for the cache and store port contracts.
 */
export declare function memoryCache(clock?: Clock): Cache;