title: Is there any way to build package dependency tree in julia-lang?
body: <p>Using <code>npm list</code> will show a tree of installed packages, versions and relations:</p>
  
  <p><a href="https://i.stack.imgur.com/F1B7L.png" rel="noreferrer"><img src="https://i.stack.imgur.com/F1B7L.png" alt="enter image description here"></a></p>
  
  <p>Although Julia package management is differ (e.g normally no duplicate copy of a package exists), But is there any way to:</p>
  
  <ul>
  <li>Know why one package have been installed?</li>
  <li>or build a package dependency tree.   </li>
  </ul>