helloworld.controller.js:
var angular = require('angular');
module.exports = angular.module('app.mymodule2', []).controller('HWController', ['$scope', function ($scope) {
 $scope.message = "This is HWController";
}]).name; 

helloworld.direcitve.js:
var angular=require('angular');
module.exports = angular.module('app.mymodule1', []).directive('helloWorld', function () {
 return {
  restrict: 'EA',
  replace: true,
  scope: {
   message: "@"
  },
  template: '<div><h1>Message is {{message}}.</h1><ng-transclude></ng-transclude></div>',
  transclude: true
 }
}).name; 

var angular = require('angular');
var d = require('./helloworld.directive');
var c = require('./helloworld.controller');
module.exports = angular.module('app.mymodule', [d, c]).name;

exports = {
 add: function (x, y) {
  return x + y;
 },
 mul: function (x, y) {
  return x * y;
 }
}; 

var angular = require('angular');
var mymodule = require('./mymodule');
var math = require('./mymodule/math');
angular.module('app', [mymodule])
 .controller('AppController', ['$scope', function ($scope) {
  $scope.message = "hello world";
  $scope.result = math.add(1, 2);
 }]);