ng serve does not detect file changes in a folder watched by Dropbox

[gsdefender]

Bug Report or Feature Request (mark with an x)

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

Versions.

@angular/cli: 1.1.3
node: 6.11.0
os: darwin x64
@angular/animations: 4.2.4
@angular/common: 4.2.4
@angular/compiler: 4.2.4
@angular/core: 4.2.4
@angular/forms: 4.2.4
@angular/http: 4.2.4
@angular/platform-browser: 4.2.4
@angular/platform-browser-dynamic: 4.2.4
@angular/router: 4.2.4
@angular/cli: 1.1.3
@angular/compiler-cli: 4.2.4
@angular/language-service: 4.2.4

Dropbox 29.4.20
O.S. OS X Yosemite

Repro steps.

Create a project inside a Dropbox controlled folder.
Run ng serve.
Modify a file inside the project directory. No change detected.

Do the same in a folder that is not under Dropbox control and it works.

The log given by the failure.

Desired functionality.

Mention any other details that might be useful.

[filipesilva]

This sounds like webpack/webpack#2258, which was moved to webpack/watchpack#42. Basically the parenthesis break serve.

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