npm run demo-app crashes after saving a change in a TS file

[alexw10]

Bug, feature request, or proposal:

There seems to be a bug right now when you spin up the demo-app:
"npm run demo-app"

If I change something in a ts file in src/lib the app crashes with:
Error: ENOENT: no such file or directory, open
'material2/dist/packages/demo-app/index.html'

What is the expected behavior?

App should rerun properly without crashing.

What is the current behavior?

Crashes when changing a TS file for example.

What are the steps to reproduce?

Providing a Plunker (or similar) is the best way to get the team to see your issue.
Plunker template: https://goo.gl/DlHd6U

What is the use-case or motivation for changing an existing behavior?

Want to be able to change files and have it automatically refresh properly.

Which versions of Angular, Material, OS, browsers are affected?

None Material2 issue.

Is there anything else we should know?

[alexw10]

Closed this as it looks like this PR fixes it:
#3794

[angular-automatic-lock-bot]

This issue has been automatically locked due to inactivity.
Please file a new issue if you are encountering a similar or related problem.

Read more about our automatic conversation locking policy.

_{This action has been performed automatically by a bot.}