title: In node, How to get notified whenever current execution context completes?
body: <p>I want to track end of the current execution context. is there any event that will be emitted whenever current execution context completed?  </p>
  
  <pre><code>console.log('starts');
  setTimeout(function(){
  console.log('set timeout called');
  }, 100);
  
  
  // something similar like this 
  process.on('async', function(){
  console.log('current execution context finished. event loop going to 
  execute the next one!'); 
  }
  </code></pre>