title: Watch a folder, use a specific entry point, then output a single css file
body: <p>I have a folder of SCSS files.  The main SCSS file is <code>/css/app.scss</code>. It imports all the other SCSS files, like <code>/css/variables.scss</code> and <code>/css/component_a.scss</code>. </p>
  
  <p>How can I have sass watch my <code>/css/</code> folder for any changes, then recompile starting from <code>/css/app.scss</code>?</p>
  
  <p>Right now it errors since <code>/css/component_a.scss</code> uses variables defined in a different file. But in <code>app.scss</code> they are imported in the correct order.</p>