JSFiddle - React, Tailwind, and code Playground

JavaScript

var foo = (function(){

    var c = function(requests) {   
        bar();
    };
    
    c.prototype = {
        bar: bar
    };
    
    return c;
    
})();

var f = new foo();

f.baz(function(){
    console.log('new instance of foo created');
});