Author styles collocated in JS, pull them out into static CSS on build. No runtime dependency.
Runtime CSS modules with SASS like preprocessing
Convert pure CSS to React Style or javascript literal objects.
[not maintained] Seed project for React apps using ES6 & webpack.
Next.js example for including a global stylesheet with HMR
Ultra small CSS in JS library in 0.4 KB
React: CSS in JS techniques comparison
Tutorial on adding PostCSS to `create-react-app` CLI
fast af css-in-js in 0.7kb
A modern, modular CSS framework for rapid application scaffolding