JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://ajax.aspnetcdn.com/ajax/knockout/knockout-3.0.0.js"></script>
Example

JavaScript

var ViewModel = function () {
    this.Foo = function () {
        alert("bar");
    };
};

var vm = new ViewModel();
ko.applyBindings(vm);
vm.Foo();