ng-packagr: AOT: Unexpected value 'undefined' exported by the module when using barrel index.ts

Type of Issue

[x] Bug Report
[ ] Feature Request

Description

I’m trying to migrate an existing library to the new Angular-cli library support This library has a lot of barrels index.ts files I’m experiencing error on build with AOT enabled

How To Reproduce

https://github.com/kepennar/ng-cli-lib-issue-repro

Given a library managed by the new angular-cli v6 library management system.

Given a component Comp1Component of this lib imported from a barrel index.ts in a module LibModule

projects/lib1/src/lib/components/index.ts

export * from './comp1.component';

projects/lib1/src/lib/lib.module.ts

import { Comp1Component } from './components';
// ...

@NgModule({
  declarations: [Comp1Component],
  exports: [Comp1Component]
})
export class LibModule {}

When an application using this lib is launched in prod mode

Then build crash with the error

ERROR in : Unexpected value 'undefined' exported by the module 'Lib1Module ...

If the component is directly imported from it’s own file. It’s work

projects/lib1/src/lib/lib.module.ts

import { Comp1Component } from './components/comp1.component';
@NgModule({
  declarations: [Comp1Component],
  exports: [Comp1Component]
})
export class LibModule {}

Reproduction steps

From the repo https://github.com/kepennar/ng-cli-lib-issue-repro

npm run build:lib npm run start:prod

Expected Behaviour

I would like ng-packagr to support correctly barrels files

Version Information

Output from: ng --version.

Angular CLI: 6.0.7
Node: 10.3.0
OS: linux x64
Angular: 6.0.3
... animations, common, compiler, compiler-cli, core, forms
... http, language-service, platform-browser
... platform-browser-dynamic, router

Package                            Version
------------------------------------------------------------
@angular-devkit/architect          0.6.7
@angular-devkit/build-angular      0.6.7
@angular-devkit/build-ng-packagr   0.6.7
@angular-devkit/build-optimizer    0.6.7
@angular-devkit/core               0.6.7
@angular-devkit/schematics         0.6.7
@angular/cli                       6.0.7
@ngtools/json-schema               1.1.0
@ngtools/webpack                   6.0.7
@schematics/angular                0.6.7
@schematics/update                 0.6.7
ng-packagr                         3.0.0
rxjs                               6.2.0
typescript                         2.7.2
webpack                            4.8.3