[Bug?] When I use cssvars like --red-1, this package will treat --red-1 as a keyword

[recovery-alt]

So what is the purpose of changing var keyword = /(\D+)/; to var keyword = /(\w+)/; in index.js line 55?
Is it a bug or a extra consideration?
Maybe var keyword = /^(\w+)$/; will be more suitable?
Looking forward to your reply, thanks.

[recovery-alt]

The way to reproduce.

1. Fork my project.
2. yarn install and yarn build
3. You will see the result css in the dist/css fold.

// source code
#app {
  color: var(--red);
}

// transform code
#app {
  color: var(red);
}

[Qix-]

Variables aren't valid colors, I don't know why you'd be passing them in as such. They've never been supported in this package.