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JavaScript Building a MEAN Application Creating and Editing Data in a MEAN App Create and Update Data in Angular

What is causing these errors?

I am getting these errors in the console and I don't know why: One is saying that the controller is not defined in the todo.bundle .js and the main ctrl is not a function, not defined in the vendor. bundle.js file. What do you think could be causing this? Here is my code:

data.js
'use strict';

var angular = require('angular');

angular.module('todoListApp')
.service('dataService', function($http, $q){
  this.getTodos = function(cb) {
    $http.get('/api/todos').then(cb);
  };

  this.deleteTodo = function(todo) {
    console.log("I deleted the " + todo.name + " todo!");
  };

  this.saveTodos = function(todos){
      var queue = [];
      todos.forEach(function(todo){
          var request;
          if(!todo._id){
              request = $http.post('/api/todos', todo)
          } else {
              request = $http.put('/api/todos/' + todo._id , todo).then(function(result){
                  todo = result.data.todo;
                  return todo;
              })
          };
          queue.push(request);
      });
  return $q.all(queue).then(function(results){
    console.log("I saved " + todos.length + " todos!");
    });
  };

});

module.exports = DataService;
main.js
'use strict';

var angular = require('angular');

angular.module('todoListApp');
.controller('mainCtrl', function($scope, dataService){

  dataService.getTodos(function(response){
    var todos = response.data.todos;
    $scope.todos =  todos;
  });

  $scope.addTodo = function() {
    $scope.todos.unshift({name: "This is a new todo.",
                      completed: false});
  };

})

module.exports = MainCtrl;
todo.js
'use strict';

angular.module('todoListApp')
.controller('todoCtrl', function($scope, dataService){
  $scope.deleteTodo = function(todo, index) {
    $scope.todos.splice(index, 1);
    dataService.deleteTodo(todo);
  };

  $scope.saveTodos = function() {
    var filteredTodos = $scope.todos.filter(function(todo){
      if(todo.edited) {
        return todo
      };
    })
    dataService.saveTodos(filteredTodos).finally($scope.resetTodoState());
  };

  $scope.resetTodoState = function(){
      $scope.todos.forEach(function(todo){
          todo.edited = false;
      });
    };

});

module.exports = TodoCtrl;

Now, I am getting this error. I corrected everything else so this is what my code looks like now for my main.js :

main.js
'use strict';

function MainCtrl ($scope, dataService) {

  dataService.getTodos(function(response){
    var todos = response.data.todos;
    $scope.todos =  todos;
  });

  $scope.addTodo = function() {
    $scope.todos.unshift({name: "This is a new todo.",
                      completed: false});
  };

}

module.exports = MainCtrl;

While Nodemon, Webpack, and Mongo are functioning as they should, I am still getting this error when I run it in the developer tools:

todo.bundle.js:73 Uncaught ReferenceError: DataService is not defined(โ€ฆ)(anonymous function) @ todo.bundle.js:73__webpack_require__ @ vendor.bundle.js:51(anonymous function) @ todo.bundle.js:31__webpack_require__ @ vendor.bundle.js:51(anonymous function) @ todo.bundle.js:11__webpack_require__ @ vendor.bundle.js:51webpackJsonpCallback @ vendor.bundle.js:22(anonymous function) @ todo.bundle.js:1
vendor.bundle.js:14035 Error: [ng:areq] Argument 'mainCtrl' is not a function, got undefined
http://errors.angularjs.org/1.5.8/ng/areq?p0=mainCtrl&p1=not%20a%20function%2C%20got%20undefined
    at vendor.bundle.js:183
    at assertArg (vendor.bundle.js:2007)
    at assertArgFn (vendor.bundle.js:2017)
    at $controller (vendor.bundle.js:10445)
    at setupControllers (vendor.bundle.js:9566)
    at nodeLinkFn (vendor.bundle.js:9347)
    at compositeLinkFn (vendor.bundle.js:8735)
    at compositeLinkFn (vendor.bundle.js:8738)
    at publicLinkFn (vendor.bundle.js:8615)
    at vendor.bundle.js:1878(anonymous function) @ vendor.bundle.js:14035(anonymous function) @ vendor.bundle.js:10582$apply @ vendor.bundle.js:17902bootstrapApply @ vendor.bundle.js:1876invoke @ vendor.bundle.js:4833doBootstrap @ vendor.bundle.js:1874bootstrap @ vendor.bundle.js:1894angularInit @ vendor.bundle.js:1779(anonymous function) @ vendor.bundle.js:31878trigger @ vendor.bundle.js:3322defaultHandlerWrapper @ vendor.bundle.js:3612eventHandler @ vendor.bundle.js:3600

in your mainCtrl

you have a line like this

angular.module('todoListApp'); .controller(....)

note the ;