JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://cdnjs.cloudflare.com/ajax/libs/knockout.mapping/2.3.5/knockout.mapping.js"></script>

JavaScript

var data = [{}, {}, {}];

var vm = ko.mapping.fromJS(data);
vm.foo = function() {
    console.log("foo");
};

vm.foo();