message: fix(server): engine build options should be optional
diff: @@ -99,7 +99,7 @@ class Engine {
  * @return {Promise.<TResult>|*}
  * @deprecated
  */
  - build(options: BuildOptions) {
  + build(options?: BuildOptions) {
  options = Object.assign({}, { type: TYPE_TEST }, options);
  let buildTargetDir;
  