JSFiddle - React, Tailwind, and code Playground

JavaScript

var TestKlass = (function() {

    function TestKlass(value) {
      this.value = value != null ? value : 'hello world';
      console.log(this.value);
    }

    return TestKlass;

})();

y = setPrototypeOf({}, TestKlass.prototype);
alert(y instanceof TestKlass);

function setPrototypeOf(object, prototype) {
    var constructor = function () {
        for (var key in object) {
            if (object.hasOwnProperty(key)) {
                (function (key) {
                    Object.defineProperty(this, key, {
                        get: function () {
                            return object[key];
                        },
                        set: function (value) {
                            object[key] = value;
                        },
                        enumerable: true
                    });
                }).call(this, key);
            }
        }
    };

    constructor.prototype = prototype;

    return new constructor;
}