serviceWorker = true fails to find @angular/service-worker with yarn workspaces

[spiffyjr]

Bug Report or Feature Request (mark with an x)

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

Versions.

Angular CLI 1.5.0
Node: 6.10.3

Repro steps.

Use yarn workspaces, set serviceWorker = true in angular-cli.json.

The log given by the failure.

Your project is configured with serviceWorker = true, but @angular/service-worker
is not installed. Run npm install --save-dev @angular/service-worker
and try again, or run ng set apps.0.serviceWorker=false in your .angular-cli.json.

Desired functionality.

The error shouldn't be fatal for an undetected service worker module. It should probably be a warning and able to be disabled similar to the TypeScript warnings for incorrect versions.

Mention any other details that might be useful.

[metasong]

yes, meet this problem too.

this is because these 2 lines:
const nodeModules = path.resolve(projectRoot, 'node_modules');
const swModule = path.resolve(nodeModules, '@angular/service-worker');

currently i'm using yarn workspace and my @angular/service-worker is in a parrent folder's nodeModules.

should change the logic to find node_modules in parents folders

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