Exploring Pigment CSS, a zero-runtime CSS-in-JS library by MUI

CSS-in-JS is a contemporary method for styling web applications where CSS is embedded within JavaScript files, allowing styles to be scoped to components. This approach is popular among developers, particularly those using React, with libraries like styled-components and Emotion leading the way. MUI has introduced Pigment CSS, a zero-runtime CSS-in-JS library that aims to merge the advantages of CSS-in-JS with the performance benefits of traditional CSS by compiling styles into static CSS files at build time, thus enhancing application performance. Pigment CSS supports Next.js and Vite, and while it offers benefits such as locally scoped styles and themeability without runtime overhead, it requires all styles to be pre-defined, contrasting with the dynamic styling capabilities of libraries like styled-components and Emotion. Despite its nascent stage, Pigment CSS integrates well with existing React applications and provides APIs for creating reusable styles and components, marking a promising addition to the CSS-in-JS ecosystem.

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