title: Angular error installing service worker to an existing app
body: <p>I need to install a service worker in my Angular 6 application.
  I run the following command:
  <code>ng add @angular/pwa --project fire</code> but after some times no service worker is added and this is the result:</p>
  
  <blockquote>
    <p>@angular/pwa@0.10.6 updated 1 package and audited 36760 packages in
    11.742s found 0 vulnerabilities</p>
    
    <p>Installed packages for tooling via npm. Maximum call stack size
    exceeded</p>
  </blockquote>
  
  <p>or </p>
  
  <blockquote>
    <p>Installed packages for tooling via npm. Expected a synchronous
    delegate but got an asynchronous one.</p>
  </blockquote>
  
  <p>This is my current configuration:</p>
  
  <pre><code>Angular CLI: 6.2.4
  Node: 10.9.0
  OS: win32 x64
  Angular: 6.0.5
  ... core
  
  Package                             Version
  -------------------------------------------------------------
  @angular-devkit/architect           0.8.4
  @angular-devkit/build-angular       0.8.3
  @angular-devkit/build-optimizer     0.8.3
  @angular-devkit/build-webpack       0.8.3
  @angular-devkit/core                0.8.4
  @angular-devkit/schematics          0.8.4
  @angular/animations                 6.0.6
  @angular/cdk                        6.4.7
  @angular/cli                        6.2.4
  @angular/common                     6.0.6
  @angular/compiler                   6.0.6
  @angular/compiler-cli               6.0.6
  @angular/forms                      6.0.6
  @angular/http                       6.0.6
  @angular/material                   6.4.7
  @angular/material-moment-adapter    6.3.0
  @angular/platform-browser           6.0.6
  @angular/platform-browser-dynamic   6.0.6
  @angular/platform-server            6.0.6
  @angular/pwa                        0.10.6
  @angular/router                     6.0.6
  @ngtools/webpack                    6.2.3
  @schematics/angular                 0.8.4
  @schematics/update                  0.8.4
  rxjs                                6.2.1
  typescript                          2.7.2
  webpack                             4.20.2
  </code></pre>