I'm using plunker and I have a separate angular file app.js. I want to 'use strict' but I get 'angular' is not defined. Is there a way to avoid this error and keep app.js as a separate file? Here is my code app.js code
   'use strict';
   var app = angular.module('plunker', []);
   app.controller('MainCtrl', function($scope) {
     $scope.name = 'World';
   });
 
     
    