import type { RequestHandler, Request } from 'express';
import { StalierOptions } from '../stalier.types';
export type StalierMiddlewareOptions = {
    /**
     * name of the upstream application
     */
    appName: string;
    /**
     * client to use for caching
     */
    cacheClient: StalierOptions['cacheClient'];
    /**
     * function to generate a cache key per request
     * Use a custom one to handle per user caching
     * @default `<appName>-<HTTP Verb>-<path>`
     */
    cacheKeyGen?: (req: Request) => string;
    /**
     * logger to use for logging
     * @default `console`
     */
    logger?: StalierOptions['logger'];
};
/**
 * middleware to cache responses
 * @param options - options for stalier
 */
export declare const stalier: (options: StalierMiddlewareOptions) => RequestHandler;