Emotion
Emotion is a performant and flexible CSS-in-JS library for React applications that allows developers to write CSS styles directly within JavaScript or TypeScript components. It provides a powerful API for composing styles, supports server-side rendering, and includes features like automatic vendor prefixing and source maps. The library is designed to be highly optimized for performance with minimal runtime overhead.
Developers should learn Emotion when building React applications that require dynamic, component-scoped styling with strong TypeScript support and excellent developer experience. It's particularly useful for design systems, complex UIs with conditional styling, and projects where CSS-in-JS benefits like colocation and theming are prioritized. Emotion is ideal for teams needing a balance between performance and flexibility in styling solutions.