I'm submitting a bug report

Webpack Version:
4.29.5

Babel Core Version:
7.3.3

Babel Loader Version:
8.0.5

Please tell us about your environment:
OSX

Current behavior:

Related issue: #480

absoluteResourcePath is still relative for some files when using babel-loader:

{ identifier: '../../../src/internal/util/toSubscriber.ts',
  shortIdentifier: '../../../src/internal/util/toSubscriber.ts',
  resource: '../../../src/internal/util/toSubscriber.ts',
  resourcePath: '../../../src/internal/util/toSubscriber.ts',
  absoluteResourcePath: '../../../src/internal/util/toSubscriber.ts',
  allLoaders: '',
  query: '',
  moduleId: '',
  hash: '5f60',
  namespace: '' }

Note how absoluteResourcePath is not absolute and it's impossible to know what file it refers to (it's inside rxjs, but it could be anywhere). The entry for main.js is absolute, but not for files inside rxjs (I suspect it has something to do with those files having original sourcemaps).

I also double checked the published rxjs source maps to make sure the source maps are all correct (they are). I also observed this with multiple other libraries like popper.js, @sentry/browser, react-bootstrap, react-transition-group.

The result of this is a completely messed up file tree in Chrome dev tools, with library files appearing in your source folders (as they are missing the node_modules component of the path etc). Even when searching for files it's not clear anymore if a file belongs to a library or to the source (imagine something like util.js). This is true even if you're not using the devtoolModuleFilenameTemplate option, I just used that in the example for logging.

Expected/desired behavior:

absoluteResourcePath should be an absolute path to the file inside /path/to/project/node_modules/rxjs.

• If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem along with a gist/jsbin of your webpack configuration.

Minimal repro: https://github.com/felixfbecker/babel-loader-source-map-bug-repro