Isomorphic Style Loader

Webpack loader for CSS that optimizes critical path rendering and supports isomorphic (universal) React apps. Current stable version is 5.4.0, released April 2022. Works like style-loader but allows server-side collection of CSS strings via _getCss() and client-side injection via _insertCss(). Uses React Context API (StyleContext) with insertCss callback. Requires React 16.8+ and css-loader. Features withStyles HOC and useStyles hook for React components. Alternative to style-loader when SSR is needed.