gistfile1.js

function Template(path) {}
Template.prototype = new loadrunner.Dependency;
Template.prototype.start = function() {
  // called when first callback is added
  // start the template load
  this.load(function(source) {
    // call complete when its done
    var template = this.compile(source)
    this.complete(template);
  })
};

using.matchers.add(/\.mustache$/, function(path) {
  return loadrunner.Template(path);
});