JSFiddle - React, Tailwind, and code Playground

HTML

<button id=with>With Constructor</button>

<button id=without>Without Constructor</button>

JavaScript

class MyClassWithConstructor {
  constructor() {
    console.log("Explicit Constructor")
  }
}

class MyClassWithoutConstructor {}

$('#with').click(function() {
	let tmp = new MyClassWithConstructor();
	alert("MyClassWithConstructor name = " + tmp.constructor.name);
})

$('#without').click(function() {
	let tmp = new MyClassWithoutConstructor();
	alert("MyClassWithConstructor name = " + tmp.constructor.name);
})