anchor.diff:  ----
   
   Also the SystemJS configuration needs some modifications in order to load the modules correctly.
  -Add the following `packages` entry for `bower_components` to your configuration unless it is already present.
  +Add the following `map`and `packages` entries for `@vaadin/angular2-polymer` to your configuration.
   
   [source,javascript]
   ----
   System.config({
     map: {
  -    'bower_components': 'bower_components'
  +    '@vaadin': 'node_modules/@vaadin'
     },
     packages: {
  -    'bower_components': {
  -      defaultExtension: 'js'
  +    '@vaadin/angular2-polymer': {
  +      main: 'index.js'
       }
     }
   });
  
positive.code: 
  [source,javascript]
  ----
  import { PolymerElement } from '../node_modules/@vaadin/angular2-polymer/polymer-element';
  ----
  
  Your Angular 2 component also needs to declare the usage of the directive.
  
negative.code: 
  [source, javascript]
  ----
  import { PolymerElement } from '@vaadin/angular2-polymer';
  
  @Component({
    selector: 'my-component',
  