快速分解：
•将我的Angular 5应用程序升级到Angular 6.
•已安装的rxjs 6& rxjs-compat 6
•使用Webpack构建.
•Dev build工作正常.
•生产构建会产生以下错误：
ERROR in chunk app [entry] bundle.js
/Users/Usr_Mac/Desktop/Angular/node_modules/@angular/core/fesm5/core.js
RuntimeTemplate.moduleId(): Module
/Users/Usr_Mac/Desktop/Angular/node_modules/rxjs/_esm5/internal/Observable.jshas no id. This should not happen.
