Some thoughts on angular files. The idea here is to make the constructors for controllers, services, etc, look like normal JS constructors.

angular-controller.js

(function(module) {
   
// Define a controller constructor
// This looks like a plain JavaScript function
function HomeCtrl(service, $location) {
    this.service = service;
    this.$location = $location;
    
    this.initialize();
}

HomeCtrl.prototype.initialize = function() {
    this.service.fetch()
        .success(this.fetched.bind(this));
};

HomeCtrl.prototype.fetched = function(data) {
    this.data = data;
};
  
  
// Explicitly set dependencies
HomeCtrl.$inject = ['service', '$location'];

// Module comes in from IIFE
module.controller('HomeCtrl', HomeCtrl);

})(angular.module('app'));

angular-service.js

(function(module) {
   
// Define a service constructor
// This looks like a plain JavaScript function
function Service($http) {
   this.$http = $http;
}

Service.prototype.fetch = function(data) {
   return this.$http.get('/api/url');
};

// Explicitly set dependencies
Service.$inject = ['$http'];

// Module comes in from IIFE
module.service('service', Service);

})(angular.module('app'));