text: 'use strict';
  
  const vm = require ( 'vm' );
  
  const script = new vm.Script ( `
  function add(a, b) {
    return a + b;
  }
  debugger
  const x = add(1, 2);
  ` );
  debugger
  const cacheWithoutX = script.createCachedData ();
  
  script.runInThisContext ();
  
  const cacheWithX = script.createCachedData ();
  
  