Styled Components CSS-in-JS

Styled Components is a free and open-source CSS-in-JS library for React and React Native that allows developers to write actual CSS code to style components. Created by Glen Maddern and Max Stoiber in 2016, it has become one of the most popular CSS-in-JS solutions, used by Airbnb, Atlassian, Coinbase, and thousands of other companies. Key features: tagged template literals: styled components are created using the styled.tag syntax with template literals (styled.div = color: blue). This keeps styles co-located with the component logic. Automatic vendor prefixing: CSS is automatically prefixed for cross-browser compatibility via stylis. Critical CSS: only the CSS for rendered components is included in the initial HTML payload, improving load performance. SSR support: server-side rendering extracts CSS into a style tag for SEO and performance. Theming: ThemeProvider wraps the app with a theme object accessible via props.theme. Dynamic styling: props can change styles (color: ${(props) => props.primary ? 'blue' : 'gray'}). Styling any component: styled(ExistingComponent) adds styles to third-party components. TypeScript support. JavaScript/TypeScript. MIT.