title: How to create appending writeStream in Node.js
body: <p>Current documentation <a href="http://nodejs.org/api.html#fs-writestream-152" rel="noreferrer">here</a> doesn't seem to mention any parameters governing the stream's behaviour with regards to whether file is re-created every time or just gets data appended.</p>
  
  <p>Is there a way to create a writeStream which appends the data?</p>