JSFiddle - React, Tailwind, and code Playground

Babel + JSX

class SuperClass {
	constructor(name){
  	this.name = name;
  }
  
  sayName = () => {
  	alert(this.name);
  }
}

class SubClass extends SuperClass {
	constructor(name){
  	super(name);
  }
  
  sayName = () => {
  	super.sayName();
  	document.getElementsByTagName('body')[0].innerHTML = this.name;
  }
}

let B = new SubClass('Noam Chomsky');
B.sayName();