title: How to fix ESLint "require is not defined" when it is used in just one file?
body: <p>When I use <code>require</code> in my JavaScript, I get a warning from eslint, "require is not defined eslint(no-undef)".</p>
  
  <p>Except for this one file, all the files in my project uses the browser <code>env</code>, which is set in my <code>.eslintrc</code>.</p>
  
  <p>How can I make an exception and specify a node env for just this one file?</p>
  
  <pre class="lang-js prettyprint-override"><code>var fs = require('fs');
  var path = require('path');
  
  // my code
  </code></pre>