JSFiddle - React, Tailwind, and code Playground

HTML

<div ng-controller="mycontroller">
<h1>{{message}}<h1>
</div>

JavaScript

angular.module('app', ['app.services'], function(myservice) {})
    .controller('mycontroller', function($scope, myservice) {
      $scope.message = myservice.sayHello();
    });

angular.module('app.services', [], function($provide) {
    $provide.service('myservice', function() {
        return {sayHello: function() { return 'hello'; }};
    });
});

angular.bootstrap(document.body, ['app']);