Execute after 2 node events fired.

2nodeEvents.js

var listenForBothEventsHandler = (function(){
  // save fired events in closure
  var firstEventFired = false;
  var secondEventFired = false;

  // return function - the actual event handler function
  return function(event){
      if(event === 'first'){
          firstEventFired = true;
      }
      if(event === 'second'){
          secondEventFired = true;
      }
      // execute if both events have fired
      if(firstEventFired && secondEventFired){
        // reset so we can correctly listen to both events getting fired again.
        firstEventFired = false;
        secondEventFired = false;

        console.log('Both events fired. Your code goes here.');
          
      }
  }
 })();

someEvent.on('first', function () {
  listenForBothEventsHandler('first');
});

someEvent.on('second', function () {
  listenForBothEventsHandler('second');
});