import type { Context, Middleware } from 'koa';
import type { Memorize } from '../domain/Memorize';
export interface KoaAdapterOptions {
    /** Time-to-live in milliseconds. Defaults to the global TTL. */
    ttl?: number;
    /** Skip caching for this route. Sets `X-Cache: BYPASS`. */
    noCache?: boolean;
    /** Custom cache key extractor. Defaults to `ctx.originalUrl ?? ctx.url`. */
    key?: (ctx: Context) => string;
    /** Invalidation tags attached to every cached entry. See `deleteByTag`. */
    tags?: string[];
}
/**
 * Creates Koa middleware that caches `GET` responses with a `2xx` status code.
 *
 * Requires `koa` to be installed as an optional peer dependency.
 *
 * @param cache - The {@link Memorize} instance to use as the backing store.
 * @param options - Optional per-route options.
 *
 * @example
 * ```ts
 * import Koa from 'koa';
 * import Router from '@koa/router';
 * import { memorize } from 'express-memorize';
 * import { createKoaMiddleware } from 'express-memorize/koa';
 *
 * const app = new Koa();
 * const router = new Router();
 * const cache = memorize({ ttl: 30_000 });
 *
 * router.get('/users', createKoaMiddleware(cache), async (ctx) => {
 *   ctx.body = await usersService.findAll();
 * });
 * ```
 */
export declare function createKoaMiddleware(cache: Memorize, options?: KoaAdapterOptions): Middleware;
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