关于angular5的惰性加载报错问题

之前为了测试一个模块优化问题，于是用angular-cli快速搭建了个ng5的脚手架demo，在应用惰性加载功能的时候发现浏览器报错如下：

ERROR Error: Uncaught (in promise): TypeError: __webpack_require__.e is not a function
TypeError: __webpack_require__.e is not a function
    at webpackAsyncContext (eval at ./src/$$_lazy_route_resource lazy recursive (main.bundle.js:13), :15:29)
    at SystemJsNgModuleLoader.loadAndCompile (core.js:6554)
    at SystemJsNgModuleLoader.load (core.js:6538)
    at RouterConfigLoader.loadModuleFactory (router.js:4543)
    at RouterConfigLoader.load (router.js:4523)
    at MergeMapSubscriber.eval [as project] (router.js:2015)
    at MergeMapSubscriber._tryNext (mergeMap.js:128)
    at MergeMapSubscriber._next (mergeMap.js:118)
    at MergeMapSubscriber.Subscriber.next (Subscriber.js:92)
    at ScalarObservable._subscribe (ScalarObservable.js:51)
    at webpackAsyncContext (eval at ./src/$$_lazy_route_resource lazy recursive (main.bundle.js:13), :15:29)
    at SystemJsNgModuleLoader.loadAndCompile (core.js:6554)
    at SystemJsNgModuleLoader.load (core.js:6538)
    at RouterConfigLoader.loadModuleFactory (router.js:4543)
    at RouterConfigLoader.load (router.js:4523)
    at MergeMapSubscriber.eval [as project] (router.js:2015)
    at MergeMapSubscriber._tryNext (mergeMap.js:128)
    at MergeMapSubscriber._next (mergeMap.js:118)
    at MergeMapSubscriber.Subscriber.next (Subscriber.js:92)
    at ScalarObservable._subscribe (ScalarObservable.js:51)
    at resolvePromise (zone.js:809)
    at resolvePromise (zone.js:775)
    at eval (zone.js:858)
    at ZoneDelegate.invokeTask (zone.js:421)
    at Object.onInvokeTask (core.js:4736)
    at ZoneDelegate.invokeTask (zone.js:420)
    at Zone.runTask (zone.js:188)
    at drainMicroTaskQueue (zone.js:595)
    at ZoneTask.invokeTask [as invoke] (zone.js:500)
    at invokeTask (zone.js:1517)

于是再次确认了几遍特性模块的配置，发现没问题，于是就开始发动搜商寻找bug源，这里不得不吐槽下国内的技术社区原创性太少，往往一个问题搜索下，搜索引擎前几页都是同一个人解答的复制黏贴版，国内搜索无果，不得不翻出去找找，最终在stackoverflow上发现了一个方案，及降低angular/cli一个小版本，如下：

npm remove -g @angular/cli
npm install -g @angular/cli@1.7.2
npm remove @angular/cli
npm add @angular/cli@1.7.2 --save-dev

操作后是ok的，但是后面的问题就不得解了，我在此将版本升级到@angular/cli@1.7.3（全局和本地）后，再运行后发现之前的问题不再出现了（在此希望有哪位兄弟帮忙解释下）！！！！！