title: Recommended way to export variables in Node.js
body: <p>I have a <code>worker.js</code> file which periodically updates the values of few variables.
  In other files of my Node.js server I want to access to those vars.</p>
  
  <p>I know how to export them, but it seems they are exported by value - i.e. they have the value they had at the moment I issued the <code>require</code> function.</p>
  
  <p>Of course, I'm interested to access to their latest value.
  What's the recommended way to do this? A "getter" function or else?</p>