JSFiddle - React, Tailwind, and code Playground

JavaScript

function PhysicsBody(aNode) {
    this.userData = aNode;
}

DynamicBody.prototype = new PhysicsBody();
DynamicBody.prototype.constructor=DynamicBody;

function DynamicBody() {
    PhysicsBody.apply(this, arguments);
    
    alert(this.userData);
}

new DynamicBody(123);