https://juejin.cn/post/6844903596992135182
https://juejin.cn/post/6844903553090191368
https://juejin.cn/post/6844903745734590477
https://segmentfault.com/a/1190000016061608
https://www.jianshu.com/p/35e0581629d2
https://github.com/postcss/postcss-custom-properties
https://juejin.cn/post/6844904122643120141#heading-9
https://github.com/hzsrc/webpack-theme-color-replacer
https://github.com/m-Ryan/css-color-extract-plugin