title: How to use Bootstrap 4 with SASS in Angular
body: <p>I'd like to use Bootstrap 4 with SASS in an Angular(4+) project created with Angular CLI.</p>
  
  <p>In particular I need to:</p>
  
  <ul>
  <li>use SASS instead of CSS both as global style and Component-style</li>
  <li>compile Bootstrap SASS source together with my custom *.scss styles</li>
  <li>make sure that my custom styles override the Bootstrap source, so I can override the Bootstrap sources when needed, without editing the Bootstrap source itself (making it easy to upgrade the Bootstrap source version)</li>
  <li>add watch &amp; auto-recompile whenever any of my *.scss files change (both for components &amp; global style) to the <code>ng serve</code> script</li>
  </ul>