Global CSS improvements

[martpie]

Attemps to solve #146

• Can it even work?
• Make it work everywhere
• Add rules instead of updating rules?
• Overall code review and simplification

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temp, reminder, ignore the following:

Goals of the PR:

• Support global CSS import from node_modules
• Support CSS modules from node_modules

[fabianishere]

Hi @martpie,

Thank for your work on this package! Did you manage to get this PR working and would you still be willing to have this functionality (support for Global CSS imports) in next-transpile-modules?

I managed to get Patternfly 4 (which uses Global CSS imports) to work with Next.js using the following changes: fabianishere@5f61c10. I'd be willing to help getting Global CSS imports to work with this package.

[martpie]

any PR is definitely welcome! I checked quickly your work yesterday ;)

What would be awesome is if you could copy the test changes of this PR to make sure it works as expected :]

[martpie]

-> #210