Style field from package.json not respected

[shravan2x]

What is the current behavior?

When @import-ing a package (blueprintjs/core) from a CSS file, the "style" field from the package's package.json file is not used. So JS files are read and this error occurs:

VM71158:1 Uncaught Error: Module build failed: ModuleBuildError: Module build failed: Unknown word (6:1)

  4 |  * Licensed under the terms of the LICENSE file distributed with this project.
  5 |  */
> 6 | export * from "./accessibility";
    | ^
  7 | export * from "./common";
  8 | export * from "./components";
  9 | 

    at runLoaders ...

If the current behavior is a bug, please provide the steps to reproduce.

I've uploaded a full reproduction at https://github.com/shravan2x/cssLoader-bug-styleUnrecgonized. Just do

1. npm install
2. npm start
3. The result files will be in dist. My repro does not include a webserver in the interest of keeping it simple, but just opening the app.[hash].js file in a text editor will make the error clear.

What is the expected behavior?

The "style" field in the package.json file is read and the respective CSS file is imported.

NPM version: 5.6
Node.JS version: 8.8.1