next.js

50b9966b - Add sassOption `implementation` to support sass-embedded (#64577)

Add sassOption `implementation` to support sass-embedded (#64577) ## What? This PR adds an option to use `sass-embedded`. ## Why? For large projects sass-embedded improves SCSS compilation time by over 50%. See also https://github.com/vercel/next.js/discussions/36160 ## How? Added a sassOption `implementation` to configure the sass-loader which Sass implementation to use. See also https://www.npmjs.com/package/sass-loader#implementation I think this a similar approach to what is done for `additionalData`. ## Additional notes In order to support `sass-embedded`, `sass-loader` is upgraded to 12.6.0. --------- Co-authored-by: Zack Tanner <1939140+ztanner@users.noreply.github.com>