JSFiddle - React, Tailwind, and code Playground

HTML

<div ng-app="testApp">
    <div ng-controller="testCtrl">
    </div>
</div>

JavaScript

var app = angular.module('testApp', []);

function testCtrl($scope) {
    $scope.hello = 0;
    var t=setTimeout(function(){ $scope.hello++; console.log($scope.hello); },5000);
    $scope.$watch('hello', function() { console.log('watch!'); });
}