JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://rawgithub.com/SteveSanderson/knockout-es5/master/dist/knockout-es5.min.js"></script>
<span data-bind="text: showViewModelData"></span>
<button data-bind="click: toggleViewModel">Click</button>

JavaScript

var vm = (function(){

  var showViewModelData = false;

  var toggleViewModel = function(){
      this.showViewModelData = !this.showViewModelData;
  }

  var vm = {
    toggleViewModel: toggleViewModel,
    showViewModelData: showViewModelData
  }

  ko.track(vm);
  return vm;
})();

ko.applyBindings(vm);