Decorator stripping for app code no longer working in 1.5.0-rc.0

[IgorMinar]

Bug Report or Feature Request (mark with an x)

- [x] bug report -> please search issues before submitting
- [ ] feature request

Versions.

Angular CLI: 1.5.0-rc.0
Node: 6.9.5
OS: darwin x64
Angular: 5.0.0-rc.2
... animations, common, compiler, compiler-cli, core, forms
... http, platform-browser, platform-browser-dynamic
... platform-server, router

@angular/cdk: 2.0.0-beta.12
@angular/cli: 1.5.0-rc.0
@angular/material: 2.0.0-beta.12
@angular/service-worker: 1.0.0-beta.16
@angular-devkit/build-optimizer: 0.0.27
@angular-devkit/core: 0.0.20
@angular-devkit/schematics: 0.0.33
@ngtools/json-schema: 1.1.0
@ngtools/webpack: 1.8.0-rc.0
@schematics/angular: 0.0.45
typescript: 2.5.3
webpack: 3.7.1

I tested this also with Typescript 2.4.2 and got the same result.

Repro steps.

ng new foo
cd foo
ng build --prod --build-optimizer

The log given by the failure.

no error, the app builds, but the bundle contains decorators coming from the app code.

Example:

AppComponent = tslib_es6.b([ Object(core.h)({
                selector: "aio-shell",
                templateUrl: "./app.component.html"
            }), tslib_es6.d("design:paramtypes", [ deployment_service_Deployment, document_service_DocumentService, core.j, location_service_LocationService, navigation_service_NavigationService, scroll_service_ScrollService, search_service_SearchService, toc_service_TocService ]) ], AppComponent);

Desired functionality.

All decorators in the app code should have been stripped.

Mention any other details that might be useful.

This used to work in the past.

[sarunint]

May be duplicate of #8027? Because the CLI automatically uses AngularCompilerPlugin when Angular's major is >= 5.