安装依赖

npm  i react-app-rewired customize-cra babel-plugin-import less less-loader -D

修改package.json

....
    "scripts": {
        "start": "react-app-rewired start",
        "build": "react-app-rewired build",
        "test": "react-app-rewired test",
        "eject": "react-scripts eject"
    },
....

根目录创建config-overrides.js

//配置具体的修改规则
const { override, fixBabelImports,addLessLoader} = require('customize-cra');
module.exports = override(
  fixBabelImports('import', {
    libraryName: 'antd',
    libraryDirectory: 'es',
    style: true,
    }),
    addLessLoader({
        lessOptions:{
            javascriptEnabled: true,
            modifyVars: { '@primary-color': 'green' },
        }
    }),
);

注意写法不固定，会随着各种插件的更新可能会有所改变，具体还是以个个插件最新写法为主