Apply postcss transforms for tagged template css

[felipeccastro]

Atom will enable the syntax highlighting for css if the tagged template is named css (instead of csjs).
I know this is kind of out of the scope of this repo, but it's such a minor change that it doesn't seem necessary to keep a separate project just for that.

[rtsao]

Cool! I think making the tag name configurable seems like a good idea (as opposed to being hardcoded to csjs)

Could you update your PR so it can be passed in via config (like plugins are) as opposed to hardcoding css?

Perhaps something like:

{
  "plugins": [["csjs-postcss", {
    "tagName": "css"
  }]]
}

And a test case for this would be nice to have as well!

[arturi]

Hi! Thanks so much for the transform. And csjs. I added the option, but also renamed the transform, since I’m using it without csjs (with this https://github.com/arturi/template-css) and I think it could be useful for any other package doing css in template strings. What do you think: https://github.com/arturi/babel-plugin-template-strings-postcss? Should I publish a separate version, or should I add tests and send a PR? Are you interested in making the transform not csjs-specific, letting it run free?

[rtsao]

@arturi Yeah, I see no reason for this to be CSJS-specific. Happy to merge in a PR!