Simle JS middleware implementation (ES6 Class version)

middleware.js

class Middleware {
  use(fn) {
    this.go = (prev => item => {
        return prev(fn(item));
      }
    )(this.go)
  }
  go(item) {
    console.count('GO');
    return item;
  }
}

const middleware = new Middleware();

middleware.use(item => {
  console.count('USE : foo');
  item.foo = 'bar';
  return item;
})

middleware.use(item => {
  console.count('USE : bar');
  item.bar = 'foo';
  return item;
})

console.warn(middleware.go({ id: 1 }))

```
USE : bar: 1
USE : foo: 1
GO: 1
{ id: 1, bar: 'foo', foo: 'bar' }
```