import { Handler, Request, Response } from "./types";
export declare type _Middleware<A, B> = <Url extends string>(handler: Handler<Url, B>) => Handler<Url, A>;
export declare type Middleware<A, B> = _Middleware<A, B> & MiddlewareOps<A, B>;
declare type MiddlewareOps<A, B> = {
    map: <C>(f: (b: B) => C) => Middleware<B, C>;
    andThen: <C>(next: Middleware<B, C>) => Middleware<A, C>;
};
declare const MiddlewareOps: <A, B>(mw: _Middleware<A, B>) => Middleware<A, B>;
export declare const Middleware: {
    of: <A, B>(f: <Url extends string>(req: Request<Url, A>, handler: Handler<Url, B>) => Promise<Response>) => Middleware<A, B>;
};
export {};
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