@ngtools/webpack's is not verbose (enough)

[dhardtke]

Bug Report or Feature Request (mark with an x)

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

I don't know if it is intentional that @ngtools/webpack is not really verbose when it comes to compile errors in the application. I have the case that I get the output below when I compile my application, yet ngc -p tsconfig-aot.json runs perfectly fine. After running ngc I can then compile my app properly using webpack with @ngtools/webpack.

I really have no proper way of debugging other than just removing several parts of my application and trying to compile it afterwards.

Versions.

node --version
v8.1.0
yarn --version
0.27.5
@ngtools/webpack: 1.5.3
webpack: 3.3.0

Windows 10 (latest), 64 Bit

Repro steps.

---

The log given by the failure.

ModuleNotFoundError: Module not found: Error: Can't resolve '../compiled/app/app.module.ngfactory' in 'C:\client\app'
    at factoryCallback (C:\client\node_modules\webpack\lib\Compilation.js:264:39)
    at factory (C:\client\node_modules\webpack\lib\NormalModuleFactory.js:247:20)
    at resolver (C:\client\node_modules\webpack\lib\NormalModuleFactory.js:65:21)
    at asyncLib.parallel (C:\client\node_modules\webpack\lib\NormalModuleFactory.js:138:21)
    at C:\client\node_modules\async\dist\async.js:3861:9
    at C:\client\node_modules\async\dist\async.js:421:16
    at iteratorCallback (C:\client\node_modules\async\dist\async.js:996:13)
    at C:\client\node_modules\async\dist\async.js:906:16
    at C:\client\node_modules\async\dist\async.js:3858:13
    at resolvers.normal.resolve (C:\client\node_modules\webpack\lib\NormalModuleFactory.js:130:23)
    at onError (C:\client\node_modules\enhanced-resolve\lib\Resolver.js:65:10)
    at loggingCallbackWrapper (C:\client\node_modules\enhanced-resolve\lib\createInnerCallback.js:31:19)
    at runAfter (C:\client\node_modules\enhanced-resolve\lib\Resolver.js:158:4)
    at innerCallback (C:\client\node_modules\enhanced-resolve\lib\Resolver.js:146:3)
    at loggingCallbackWrapper (C:\client\node_modules\enhanced-resolve\lib\createInnerCallback.js:31:19)
    at next (C:\client\node_modules\tapable\lib\Tapable.js:234:11)
    at C:\client\node_modules\enhanced-resolve\lib\UnsafeCachePlugin.js:40:4
    at loggingCallbackWrapper (C:\client\node_modules\enhanced-resolve\lib\createInnerCallback.js:31:19)
    at runAfter (C:\client\node_modules\enhanced-resolve\lib\Resolver.js:158:4)
    at innerCallback (C:\client\node_modules\enhanced-resolve\lib\Resolver.js:146:3)
    at loggingCallbackWrapper (C:\client\node_modules\enhanced-resolve\lib\createInnerCallback.js:31:19)
    at next (C:\client\node_modules\tapable\lib\Tapable.js:234:11)
    at innerCallback (C:\client\node_modules\enhanced-resolve\lib\Resolver.js:144:11)
    at loggingCallbackWrapper (C:\client\node_modules\enhanced-resolve\lib\createInnerCallback.js:31:19)
    at next (C:\client\node_modules\tapable\lib\Tapable.js:231:35)
    at resolver.doResolve.createInnerCallback (C:\client\node_modules\enhanced-resolve\lib\DescriptionFilePlugin.js:44:6)
    at loggingCallbackWrapper (C:\client\node_modules\enhanced-resolve\lib\createInnerCallback.js:31:19)
    at afterInnerCallback (C:\client\node_modules\enhanced-resolve\lib\Resolver.js:168:10)
    at loggingCallbackWrapper (C:\client\node_modules\enhanced-resolve\lib\createInnerCallback.js:31:19)
    at next (C:\client\node_modules\tapable\lib\Tapable.js:234:11)
resolve '../compiled/app/app.module.ngfactory' in 'C:\client\app'
  using description file: C:\client\package.json (relative path: ./app)
    Field 'browser' doesn't contain a valid alias configuration
  after using description file: C:\client\package.json (relative path: ./app)
    using description file: C:\client\package.json (relative path: ./compiled/app/app.module.ngfactory)
      no extension
        Field 'browser' doesn't contain a valid alias configuration
        C:\client\compiled\app\app.module.ngfactory doesn't exist
      .ts
        Field 'browser' doesn't contain a valid alias configuration
        C:\client\compiled\app\app.module.ngfactory.ts doesn't exist
      .js
        Field 'browser' doesn't contain a valid alias configuration
        C:\client\compiled\app\app.module.ngfactory.js doesn't exist
      as directory
        C:\client\compiled\app\app.module.ngfactory doesn't exist

Desired functionality.

I would like to get at least some info about what is going wrong. Setting webpack's verbose flag (on the CLI) or using the LoaderOptionsPlugin with verbose: true doesn't change anything.

Mention any other details that might be useful.

Sry, it's not an OSS project :(

[dhardtke]

Just saw this issue: #7113

Seems to be why the build failed - anyway: My issue then is more a feature request, really. Is there a way to add some output to ngtools/webpack's internals?

[enjoiful]

Absolutely this needs to be supported. Its maddening to try and figure out which part of my code broke AOT -- and the only way to do it is to incrementally removing parts of my app.

[dhardtke]

Closing this as I just saw #6918

[shayded-exe]

@dhardtke See my comment here for a workaround #6918 (comment)

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