[@ngtools/webpack] Error: TypeScript compilation failed

[cyr-x]

Bug Report or Feature Request (mark with an x)

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

The @ngtools/webpack loader throws an error if I'm using a package which was symlinked via yarn link and the resolve attribute inside the webpack config is containing '.ts' as an extension.

Versions.

ngtools/webpack 1.8.0-rc.0

Repro steps.

1. Clone the basic example repository which is using webpack + ngtools/webpack:
   https://github.com/cyr-x/ngtools-sample

2. Run yarn to install deps.

3. Clone a very simple "package" repository:
   https://github.com/cyr-x/package-sample

4. Symlink the package-sample repository via yarn link.

5. Run yarn build && yarn start:prod (=> everything works fine)

6. Uncommend the resolve attribute inside the webpack.config.js and repeat step 5. An error is thrown during the build step.

The log given by the failure.

ERROR in ../package-sample/index.ts
Module build failed: Error: TypeScript compilation failed.
    at plugin.done.then (/xxxx/xxxx/xxxx/ngtools-sample/node_modules/@ngtools/webpack/src/loader.js:479:27)
    at <anonymous>
 @ ./src/app.module.ts 5:0-38
 @ ./src/app.module.ngfactory.js
 @ ./src/main.ts

Desired functionality.

The build should finish without an error.

[filipesilva]

This issue is essentially a duplicate of #6228. Please see #6228 (comment) for a description of why this scenario is not supported.

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