async-context.js

var q = require('q'),
    vm = require('vm'),
    ctx = vm.createContext({setTimeout: setTimeout, console: console, end: q.defer()}),
    script = vm.createScript("now = 1; setTimeout(function() { now = 2; console.log('Inside the VM: ' + now); end.resolve() }, 1000);");
    
script.runInContext(ctx);

ctx.end.promise.then(function () {
    console.log("Now process template with " + ctx.now);
}, 500);