postcss-styled-syntax bridges the gap between CSS-in-JS libraries like Styled Components and PostCSS tooling. It allows PostCSS plugins to understand and process CSS embedded within JavaScript or TypeScript files, extracting and applying transformations to that CSS. By parsing styled-components syntax, it enables advanced linters, formatters, and other PostCSS-based tools to work seamlessly with your styled-components code, improving code quality and maintainability. Therefore, developers gain the benefits of PostCSS's powerful ecosystem within their CSS-in-JS workflows.