如何解决 Ionic 未捕获错误：找不到模块“。”添加新页面时？

未捕获的错误：找不到模块“。”

    at webpackMissingModule (index.js:3)
    at e.code (index.js:3)
    at Object.<anonymous> (index.js:9)
    at __webpack_require__ (bootstrap ee3a374a94c4cd74e2a6:54)
    at Object.256 (main.ts:5)
    at __webpack_require__ (bootstrap ee3a374a94c4cd74e2a6:54)
    at Object.233 (main.js:412)
    at __webpack_require__ (bootstrap ee3a374a94c4cd74e2a6:54)
    at webpackJsonpCallback (bootstrap ee3a374a94c4cd74e2a6:25)
    at main.js:1

添加新内容之前bookmarks应用程序中的页面，应用程序工作得很好，添加后bookmarks我收到的页面Uncaught Error: Cannot find module "."

这是我的设置

Ionic Framework: 3.9.2
Angular Core: 5.2.11
Angular Compiler CLI: 5.2.11
Node: 8.11.1

应用程序模块.ts

import { ContactPage } from '../pages/contact/contact';
import { BookmarksPage} from'../pages/bookmarks/bookmarks';

@NgModule({
  declarations: [
    ContactPage,
    BookmarksPage,
  ],
  imports: [
    BrowserModule,
    IonicModule.forRoot(MyApp)
  ],
  bootstrap: [IonicApp],
  entryComponents: [
    ContactPage,
    BookmarksPage,
  ],
  providers: [
    StatusBar,
    SplashScreen,
    {provide: ErrorHandler, useClass: IonicErrorHandler}
    ]
  })
export class AppModule {}

书签.ts

import { Component } from '@angular/core';
import { NavController } from 'ionic-angular';

@Component({
selector: 'page-bookmarks',
templateUrl: 'bookmarks.html'
 })
export class BookmarksPage {
    constructor(public navCtrl: NavController) {
  }
}

开发者控制台中的index.js https://drive.google.com/open?id=1gZnVUsjprTLszfkYAJq2nyZeAowBJhDG

我尝试清除缓存并npm rebuild还。 在构建中（ionic serve）过程没有错误。但在浏览器中我得到找不到模块，我真的很想了解这里发生了什么

去除umd从进口

change

 import { NavController } from 'ionic-angular/umd';

to

 import { NavController } from 'ionic-angular';

check this https://github.com/webpack/webpack/issues/4921更多细节。