TypeScript barrels break build

Type of Issue

[x] Bug Report
[ ] Feature Request

Description

When trying to build a library of reusable Angular component, ng-packagr doesn’t seem to package the generated distribution version correctly

How To Reproduce

ng-package.json

{
  "$schema": "./node_modules/ng-packagr/ng-package.schema.json",
  "dest": "package",
  "lib": {
    "entryFile": "src/lib/public_api.ts"
  }
}

src/lib/public_api.ts

export * from './modules/modules-a';
export * from './modules/modules-b';
export * from './modules/modules-c';

Then, in each module folder I have an index.ts to export the specific module:

src/lib/modules/module-a/index.ts

export * from './component-a.component';
export * from './component-a.module';

Expected Behaviour

When I generate the library with ng-packagr -p ng-package.json, the ngx-customer-library.metadata.json contains only this line of code:

{"__symbolic":"module","version":3,"exports":[{"from":"./modules/module-3/"}],"metadata":{},"origins":{},"importAs":"my-angular-library"}a

However, everything is working fine if inside my src/lib/public_api.ts I add an extra /index:

export * from './modules/modules-a/index';
export * from './modules/modules-b/index';
export * from './modules/modules-c/index';

Version Information

ng-packagr: v1.4.1
node: v8.6.0
@angular: v4.4.5
rxjs: 5.4.3
zone.js: .8.18
@angular/cli: 1.3.2

[dherges]

Here are issues that are related:

• Angular CLI w/ barrels and cyclic dependencies: https://github.com/angular/angular-cli/issues/1831#issuecomment-247895889
• ngc and barrels w/ AoT compilation: https://github.com/angular/angular/issues/13008#issuecomment-293543335
• AoT and barrels: https://github.com/angular/angular/issues/13590

Seeing all this, I think it’s best to not use TypeScript barrels!

[jeffora]

I’ve also opened a pull request angular/angular#22856 which fixes the issue in my specific reproduction above, so might cover quite a few of these issues.