This a simple version of Koa. It is just for learning purpose which can't be used directly in a production environment.

const ToyKoa = require('./toy-koa/app.js');
const app = new ToyKoa();

app.use(ctx => {
    ctx.body = 'Hello ToyKoa';
})

app.listen(3000);

• new ToyKoa()
• app.use(callback: (ctx, next) => {})
• app.listen(port, address, callback)