在路由的resolve中使用lazyload加载控制器无效

背景：

webpack打包
angular-ui-router配置路由
angular1.4.7
ocLazyLoad

//写法1
$stateProvider
        .state('app', {
            url: '/app',
            template: require('./views/app.html'),
            controller: 'layoutsController as vm',
            resolve: {
                loadLayoutsController: function($q, $ocLazyLoad) {
                    console.info('state resolve:', 'app, layoutsController');
   
                    var deferred = $q.defer();
                    let layoutsModule = require('../layouts');
                    $ocLazyLoad.load(layoutsModule.name);
                    deferred.resolve(layoutsModule.controller);
                    return deferred.promise;
                }
            }
        });
       
//写法2       
$stateProvider
        .state('app', {
            url: '/app',
            template: require('./views/app.html'),
            controller: 'layoutsController as vm',
            resolve: {
                loadLayoutsController: function($ocLazyLoad) {
                    console.info('state resolve:', 'app, layoutsController');
                    let layoutsModule = require('../layouts');
                    return $ocLazyLoad.load(layoutsModule.name); 
                }
            }
        });
       
// ../layouts/layouts.controller.js       
export default function layoutsController($scope) {
    'ngInject';
    console.info('layoutsController:', 'controller is loaded');
}

// ../layouts/index.js
import layoutsController from './layouts.controller.js';

let layoutsModule = angular

.module('layouts', [])
.controller('layoutsController', layoutsController);

export default layoutsModule.name;
采用写法1时能够正常打出
console.info('state resolve:', 'app, layoutsController');和
console.info('layoutsController:', 'controller is loaded');两条信息
采用写法2时只能够正常打出
console.info('state resolve:', 'app, layoutsController');一条信息，layoutsController没有正常运行。

请问这是为什么呢？