CSS-Extractor Tutorial: Strip Away Unused Styles Instantly

CSS-Extractor libraries (also known as build-time or zero-runtime CSS-in-JS libraries) compile and extract styles written in JavaScript/TypeScript directly into static .css files during the build process. This methodology completely eliminates the runtime browser overhead associated with traditional CSS-in-JS tools (like older versions of styled-components or Emotion), making it essential for modern frameworks like Next.js and React Server Components (RSC). The Top 5 CSS-Extractor Libraries 6 Best CSS Frameworks for Developers in 2026 – Strapi