title: Why will yarn install dev dependencies when I just need the builds?
body: <p>If I invoke <code>yarn add &lt;my-package&gt;</code>, <em>Yarn</em> will install both dependencies and devDependencies of <code>&lt;my-package&gt;</code>. Is it normal behavior ?</p>
  
  <p>I checked the documentation but I couldn't find a way to prevent it from installing the development dependencies (which I don't need). I believe <em>devDependencies</em> are the dependencies that were used to compile the sources into the build scripts. And building my app I just need the builds.</p>