Angular cli after update npm start give error

Question

I create application using angular cli and use backend proxy to handle backend and using polymer(vaadin) it work correctly until I update to angular cli 1.0.0-beta.22 it give Er

Answer 1

This is caused by Angular CLI latest update. In the latest update, webpack searches for boostrap Module in main.ts top level. In main-polymer.ts, main.ts is wrapped by addEventListener so webpack can't find the bootstrap module that's why it reports an error.

Further reference github.com/angular/angular-cli/issues/2887

Answer 2

Using github I have found a workaround that is work for me I remove the main-polymer.ts file and edited the main ts file as below.

main.ts

import './polyfills.ts';

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { environment } from './environments/environment';
import { AppModule } from './app/';

if (environment.production) {
  enableProdMode();
}

var webComponentsFlag = false;
document.addEventListener('WebComponentsReady',() =>{
  if (!webComponentsFlag)
    platformBrowserDynamic().bootstrapModule(AppModule);
  webComponentsFlag = true;
});
if (webComponentsFlag)
 platformBrowserDynamic().bootstrapModule(AppModule);

and it worked for me. but can't build using ng build to overcome this problem refer the

github issue

Answer 3

I had the same problem, what I did is go back to 1.0.0-beta.21 and it work again :)

Answer 4

I have noticed that it sometimes happens when you have an invalid import statement! if for some reason you have deleted a component and you left the import there, then it will give you:

"Tried to find bootstrap code, but could not. Specify either statically analyzable bootstrap code or pass in an entryModule to the plugins options."