Using promise and async in Koa

koa-promise.js

const Koa = require('koa');
const app = new Koa();

function middleWare1 (ctx, next) { // This is a function that return a promise
  return new Promise((resolve, reject) => {
    ctx.body = 'Hello';
    next().then(resolve).catch(reject);
  })
}

async function middleWare2 (ctx, next) { // This is an async function
  ctx.body +=  'World';
  await next();
  return true;
}

app.use(middleWare1);
app.use(middleWare2);

app.listen(3000);