Feature: Add @property definitions to CSS plugin output

[davejsdev]

@property definitions help enable type safety for CSS Custom Properties.

MDN Docs: https://developer.mozilla.org/en-US/docs/Web/CSS/@property

It might be good to make a flag for this in the plugin too since defining property types is optional and adds extra weight to the output.

Suggested API:

// Types
interface Options {
  // ...
  propertyDefinitions?: boolean;  // default: true
}

// Usage
pluginCSS({
  propertyDefinitions: false
})

[deecodess]

Hey! Would love to work on this!

[drwpow]

@deecodess Sure! I’d be happy to have some help! But before you start, I’d love to see a proposal (maybe just as a reply to this issue) for what each DTCG token type would translate to in a @property declaration. That way we are on the same page!