code: function defineGlobals() {
    Object.keys(NODEIFY_FUNCTIONS).forEach((nodeifyName) => {
      global[nodeifyName] = NODEIFY_FUNCTIONS[nodeifyName].nodeify;
    });
  
    Object.keys(PROMISE_TYPES).forEach((promiseName) => {
      global[promiseName] = PROMISE_TYPES[promiseName].Promise;
    });
  }
docs: Exposes nodeify functions and promise types as globals so that they can
  be accessed in the benchmark code.
  @private