title: How to set directory mappings for Koala for the whole folder?
body: <p>I'm trying to set directory mappings for <a href="http://koala-app.com/" rel="nofollow">Koala prepocessor</a> to output all files into <code>css</code> folder.</p>
  
  <p>My project file structure:</p>
  
  <pre><code>-- Project folder
    -- css
      -- style.css
      -- print.css
    -- scss
      -- style.scss
      -- print.scss
  </code></pre>
  
  <p>I would like Koala to watch for all files in <code>scss</code> folder and output them into <code>css</code> folder.</p>
  
  <p>I've found it is possible with project settings file <code>koala-config.json</code> placed in the root of the project: <a href="https://github.com/oklai/koala/wiki/Using-project-settings" rel="nofollow">https://github.com/oklai/koala/wiki/Using-project-settings</a></p>
  
  <p>When I tried that, it won't work:</p>
  
  <pre><code>// The mappings of source directory and output directory
  "mappings": [
  {
      "src": "scss",
      "dest": "css"
      }
  ],
  </code></pre>
  
  <p>How to set output mappings for the whole folder?</p>