Modern web apps struggle with global CSS bloat; CSS-in-JS (Styled Components, Emotion) embeds styles in components to deliver scoped, modular, and debuggable code with performance wins. The article compares libraries, shows an e-commerce refactor using styled components, and notes future gains with SSR/SSG and prop-driven utilities.
CSS-in-JS libraries like Styled-Components and Emotion enable devs to write CSS code directly in JS files, creating reusable UI components with built-in styles, leading to easier maintenance, better performance, and dynamic styling capabilities.
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