// tslint:disable:no-any
// tslint:disable:no-console
// tslint:disable:no-shadowed-variable

import * as express from "express";

const req = {
  a: 1,
  b: "2"
};

export type IRequestMiddleware<T> = (request: any) => Promise<T>;

export type IRequestHandler<T> = (request: any) => Promise<T>;

const extractAmw: IRequestMiddleware<number> = (req: any): Promise<number> =>
  Promise.resolve(req.a);

const extractBmw: IRequestMiddleware<string> = (req: any): Promise<string> =>
  Promise.resolve(req.b);

const curriedTypedHandler = (a: number) => (b: string): IRequestHandler<{}> => {
  return request => Promise.resolve({ "A:": a, "B:": b });
};


const withRequestMiddleware = <T>(mw1: IRequestMiddleware<T>): ((h) => any) => {
  return curriedTypedHandler => {
    return async request => {
      const mwResult = await mw1(request);
      return curriedTypedHandler(mwResult);
    };
  };
};

const h1 = withRequestMiddleware(extractAmw)(curriedTypedHandler)(req).then(
  curriedTypedHandler =>
    withRequestMiddleware(extractBmw)(curriedTypedHandler)(req)
);

h1.then(req).then(console.log);