The Wix dev team throws their hat into the CSS preprocessor ring:
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Stylable is a CSS preprocessor that enables you to write reusable, highly-performant, styled components. Each component exposes a style API that maps its internal parts so you can reuse components across teams without sacrificing stylability.
- Scopes styles to components so they don’t “leak” and clash with other styles.
- Enables custom pseudo-classes and pseudo-elements that abstract the internal structure of a component. These can then be styled externally.