title: npm install ->Failed at the node-sass@4.5.0 postinstall script
body: <p>I'm trying to do <code>npm install</code> and an error appears : </p>
  
  <pre><code>Failed at the node-sass@4.5.0 postinstall script.
  </code></pre>
  
  <p>I tried to delete <code>node_modules</code> and then reinstall it, same error appears.
  what will be the solution?</p>
  
  <p>node v8.9.3<br>
  npm v5.4.2<br>
  ionic 3.19.0</p>