JSFiddle - React, Tailwind, and code Playground

HTML

<div class="btn">Test</div>

CSS

.btn {
    border: 1px solid black;
    padding: 1em;
    margin: 1em;
    display: inline-block;
    background-color: #eee;
}

CoffeeScript

class FirstClass
  constructor: ->
    $('.btn').click @btnClick

  btnClick: =>
    alert('Hi from the first class!')

class SecondClass extends FirstClass
  btnClick: =>
    super()
    alert('Hi from the second class!')
    
@obj = new SecondClass