title: fs.existsSync is not a function in node error
body: <p>I am getting this when running node in Ubuntu 14.04,  'fs.existsSync'  is not a function . the code is </p>
  
  <pre><code> var fs = require('fs');
   fs.existsSync(buildDescFile);
  </code></pre>
  
  <p>The version of node is v0.10.25 . Am I missing something.</p>