.eslintrc.json - how to make it work with the extends?

The `.eslintrc.json` that is placed in the web folder extends the core eslint file.

But I have a problem in PHPStorm that even if I have installed the node modules in `core` I get errors in all JS-files of missing packages.

It seems like EsLint finds the core config, but not the core node_modules. How do you solve that? I'm guessing it's included to make things easier.