jest-css-modules-transform

A Jest preprocessor that transforms CSS, SCSS, SASS, Less, and Stylus files into JavaScript objects mimicking Webpack's css-loader module output. Version 4.4.2 is current stable; released occasionally with bug fixes and minor features. Unlike simple identity mock objects (e.g., `{}`), this generates correct class name mappings (as-is, camelCase, dashes), supports PostCSS with custom plugins, and allows prepending variables or mixins. It provides configuration via `jest-css-modules-transform-config.js` for per-preprocessor options, making it ideal for visual regression testing or component testing where real class names matter.