Why doesn't Angular see the module?

Question

Angular

There is a piece of code.

var app = angular.module('todoApp', ['ui.router', 'ngResource', 'ui.bootstrap']);

app.config(['$stateProvider', '$urlRouterProvider', 
  function($stateProvider, $urlRouterProvider) {
    
    $urlRouterProvider.otherwise("/");

     $stateProvider
        .state('home', {
          url: "/",
          templateUrl: '/templates/index.html',
        })
        .state('signup', {
          url: "/signup",
          templateUrl: '',
        })
}]);

module.exports = app;

When launched in a browser, it throws an error: ReferenceError: module is not defined.
Why doesn't he see him?

Answer 1

if you are using ng-app then all scripts must be loaded before the document.ready event. That is, it is necessary to shove the section into the head in the right order.
If you want to load scripts asynchronously, then angular.bootstrap will help you.