title: How to Exclude sass files from ng-build?
body: <p>I use sass-loader in webpack.config to compile scss files to one bundled minified CSS file and I will manually reference this file in my "Index.html" but i need to exclude scss files from "ng build", I excluded it in <code>tsconfig.app</code> 
  <code>"exclude": ["../**/*.scss"]</code> but it didn't work.</p>