JSFiddle - React, Tailwind, and code Playground

JavaScript

function extends(child, parent) {
    var emptyCtor = function() {};
    emptyCtor.prototype = parent.prototype;
    child.prototype = new emptyCtor;
    child._super = parent;
    return child;
};

var ParentClass = function() {
	this.a = 1;
};

var ChildClass = extends(function() {}, ParentClass);

document.body.innerHTML = new ChildClass.a;