CSS
Modern CSS tooling has evolved beyond preprocessors. This collection covers parsing engines, layout libraries that power frameworks like React Native, and converters that bridge CSS to other formats.
CSS-in-JS
Section titled “CSS-in-JS”Compiled CSS-in-JS
Section titled “Compiled CSS-in-JS”Compiled extracts styles at build time, eliminating runtime overhead while preserving the developer experience of CSS-in-JS.
Key features:
- Automatic critical CSS extraction
- TypeScript support with autocomplete
- Compatible with React Server Components
- Zero runtime in production
When to use: You want the colocation benefits of CSS-in-JS without the runtime performance cost.
Parsing & Analysis
Section titled “Parsing & Analysis”CSSTree
Section titled “CSSTree”CSSTree is a production-grade CSS toolkit used by tools like Svelte and cssnano.
npm install css-treeCapabilities:
- Parser — Detailed AST following W3C specs
- Walker — Traverse and transform the AST
- Generator — Convert AST back to CSS
- Lexer — Validate values against CSS grammar
Use cases:
- Building CSS linters or formatters
- Analyzing specificity or unused selectors
- Minification and optimization pipelines
Layout Engines
Section titled “Layout Engines”These libraries implement Flexbox layout algorithms for non-browser environments.
| Library | Language | Used By |
|---|---|---|
| Yoga | C++ (with bindings) | React Native, Litho, ComponentKit |
| Taffy | Rust | Dioxus, Bevy UI, custom renderers |
Facebook’s cross-platform layout engine. If you’re building a React Native app, you’re already using Yoga under the hood.
- Implements Flexbox spec with minor deviations
- Bindings available for JavaScript, Java, C#, and more
- Battle-tested in production at massive scale
A modern Rust alternative to Yoga with a focus on correctness and performance.
- Full Flexbox and CSS Grid support
- WebAssembly compatible
- Actively maintained with excellent documentation
| Category | Tools | Use Case |
|---|---|---|
| CSS-in-JS | Compiled | Zero-runtime styling with static extraction |
| Parsing | CSSTree | Building tools that analyze or transform CSS |
| Layout | Yoga, Taffy | Cross-platform layout engines for native apps |
| Conversion | Transform | Converting between CSS, JSON, and other formats |
Code Converters
Section titled “Code Converters”Transform
Section titled “Transform”Transform is a Swiss Army knife for code conversion.
Supported transformations:
- CSS ↔ JS objects
- SVG → JSX / React Native
- JSON ↔ TypeScript types
- GraphQL → TypeScript
- And 30+ more formats
Try it online at transform.tools