ng add @angular/pwa doesn't work correctly in angular-cli 6.1.2

[adrianojosue]

Bug Report or Feature Request (mark with an x)

- [x] bug report -> please search issues before submitting
- [ ] feature request

Command (mark with an x)

- [ ] new
- [ ] build
- [ ] serve
- [ ] test
- [ ] e2e
- [ ] generate
- [x] add
- [ ] update
- [ ] lint
- [ ] xi18n
- [ ] run
- [ ] config
- [ ] help
- [ ] version
- [ ] doc

Versions

     _                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
                |___/


Angular CLI: 6.1.2
Node: 8.11.3
OS: win32 x64
Angular: 6.1.2
... animations, cli, common, compiler, compiler-cli, core, forms
... http, language-service, platform-browser
... platform-browser-dynamic, router

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.7.2
@angular-devkit/build-angular     0.7.2
@angular-devkit/build-optimizer   0.7.2
@angular-devkit/build-webpack     0.7.2
@angular-devkit/core              0.7.2
@angular-devkit/schematics        0.7.2
@angular/pwa                      0.7.2
@ngtools/webpack                  6.1.2
@schematics/angular               0.7.2
@schematics/update                0.7.2
rxjs                              6.2.2
typescript                        2.7.2
webpack                           4.9.2

Repro steps

ng new my-app --style=scss --routing
cd my-app
ng add @angular/pwa

The log given by the failure

$ ng add @angular/pwa
Installing packages for tooling via npm.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for [email protected]: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})

+ @angular/[email protected]
added 2 packages in 12.669s
Installed packages for tooling via npm.
Path "/ngsw-config.json" already exist.

Desired functionality

$ ng add @angular/pwa
Installing packages for tooling via npm.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for [email protected]: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})

+ @angular/[email protected]
added 2 packages in 7.303s
Installed packages for tooling via npm.
CREATE ngsw-config.json (392 bytes)
CREATE src/assets/icons/icon-72x72.png (792 bytes)
CREATE src/assets/icons/icon-96x96.png (958 bytes)
CREATE src/assets/icons/icon-128x128.png (1253 bytes)
CREATE src/assets/icons/icon-144x144.png (1394 bytes)
CREATE src/assets/icons/icon-152x152.png (1427 bytes)
CREATE src/assets/icons/icon-192x192.png (1790 bytes)
CREATE src/assets/icons/icon-384x384.png (3557 bytes)
CREATE src/assets/icons/icon-512x512.png (5008 bytes)
CREATE src/manifest.json (1067 bytes)
UPDATE angular.json (3646 bytes)
UPDATE package.json (1380 bytes)
UPDATE src/app/app.module.ts (526 bytes)
UPDATE src/index.html (383 bytes)
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for [email protected]: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})

added 1 package in 7.103s

[alan-agius4]

Duplicate of #11640

It has been addressed in v6.2.0-beta.1

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