title: How can I make webpack skip a require
body: <p>How can I make webpack skip occurences of</p>
  
  <pre><code>require('shelljs/global');
  </code></pre>
  
  <p>in my source files? I want to make a bundle of my source files but keep the <code>require('shelljs/global')</code> in the files and not bundle <code>shelljs/global</code>.</p>