Parameters

1. data {data}:

   The Zone's data object, useful when you want to append data to the Zone.

   This examples wraps document.createElement to keep count of how many elements are created, and appends the count to data when the Zone ends.

   const mySpec = function( data ) {
       let realCreateElement, count = 0;
   
       return {
           beforeTask: function() {
               realCreateElement = document.createElement;
               document.createElement = function() {
                   count++;
                   return realCreateElement.apply( this, arguments );
               };
           },
           afterTask: function() {
               document.createElement = realCreateElement;
           },
           ended: function() {
               data.elementsCreated = count;
           }
       };
   };
   
   const zone = new Zone( mySpec );
   
   zone.run( function() {
   
       // Do stuff here
   } )
       .then( function( data ) {
           data.elementsCreated; // -> 5
       } );