Without this package, it seems the code samples don't work. The browser reports the following errors:
GET http://localhost:8000/node_modules/reflect-metadata/Reflect.js
localhost/:10 GET http://localhost:8000/node_modules/reflect-metadata/Reflect.js 404 (Not Found)
(index):15 Error: (SystemJS) reflect-metadata shim is required when using class decorators
Error loading http://localhost:8000/app/websocket-observable-service-subscriber.ts
Without this package, it seems the code samples don't work. The browser reports the following errors: