npm i -S less less-loader
复制代码

安装完 less-loader 会需要配置这个东西

在 less-loader 6.0 之前 webpack 这样配置就可以了，但是升级到了 6.0 就会报错

Failed to compile.
./node_modules/antd/es/alert/style/index.less (./node_modules/css-loader/dist/cjs.js!./node_modules/less-loader/dist/cjs.js??ref--6-oneOf-6-2!./node_modules/antd/es/alert/style/index.less)
ValidationError: Invalid options object. Less Loader has been initialized using an options object that does not match the API schema.
 - options has an unknown property 'javascriptEnabled'. These properties are valid:
   object { lessOptions?, prependData?, appendData?, sourceMap?, implementation? }
复制代码

6.0 后 需要修改为

重启后，又可以正常干活了。