Do you use Web Compiler extension?
  v1.0 Posted at 19/06/2018 11:54 AM by Tiago Araujo
You can use Visual Studio's Web Compiler extension to create a bundle.css and test if CSS was compiled successfully.

More information and download at Visual Studio Marketplace.

Figure: Web Compiler can find missing curly braces
Unfortunately different kinds of errors, like are not caught.
Figure: Curly braces in the wrong place, but still compiled successfully

In addition, Gulp is wrongly successful too:

Figure: Gulp couldn't find the curly braces error​

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