title: node.js fs.existsSync always false
body: <p>I have a file on this path:
  <code>~/Downloads/flightlog_2017-71-19_19747.txt</code></p>
  
  <p>But when i try to write or check if it exist:</p>
  
  <p><code>fs.existsSync('~/Downloads/flightlog_2017-71-19_19747.txt')</code></p>
  
  <p>It always return <code>false</code></p>
  
  <p>If I do in terminal:</p>
  
  <p><code>$ nano ~/Downloads/flightlog_2017-71-19_19747.txt</code></p>
  
  <p>This works fine</p>