message: test: improve ng build flags for cli-hello-world
  Remove unnecessary --build-optimizer flag and add --sourcemaps flag to
  generate source maps for better debugging.
  PR Close
diff: "scripts": {
  "ng": "ng",
  "start": "ng serve",
  - "build": "ng build --prod --build-optimizer",
  + "build": "ng build --prod --sourcemaps",
  "test": "ng test --single-run",
  "lint": "ng lint",
  "e2e": "ng e2e",
  