安装，各种装先

$ create-react-app antd-demo && cd antd-demo
...
$ yarn add antd
...
$ yarn add react-app-rewired customize-cra -D
...
$ yarn add less less-loader babel-plugin-import -D
...
done

修改 package.json

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

根目录新建文件 config-overrides.js

const { override, fixBabelImports, addLessLoader } = require('customize-cra');

module.exports = override(
  fixBabelImports('import', {
    libraryName: 'antd',
    libraryDirectory: 'es',
    style: true,
  }),
  addLessLoader({
    javascriptEnabled: true,
    // modifyVars: { '@primary-color': '#1DA57A' }, # 这里不注释掉，那你的无法修改主题色primary-color 这里很坑的 要注意！
  }),
);

使用 less 定义样式并修改主题

src/App.js

import React, { Component, Fragment } from 'react'
import { Button } from 'antd';
import './style.less'  //引入less文件

// Components

class App extends Component {
  render(){
    return(
      <Fragment>
        <Button type="primary">Primary</Button>
        <Button>Default</Button>
        <Button type="dashed">Dashed</Button>
        <Button type="danger">Danger</Button>
      </Fragment>
    )
  }
}

export default App

新建一个less文件src/style.less

@import "~antd/dist/antd.less";  //引入官方样式的less文件

@primary-color: deeppink; //修改主题

注意，这种方式已经载入了所有组件的样式，不需要也无法和按需加载插件 babel-plugin-import 的 style 属性一起使用。
因此需要把 config-overrides.js修改成这样👇

const { override, fixBabelImports, addLessLoader } = require('customize-cra');

module.exports = override(
  fixBabelImports('import', {
    libraryName: 'antd',
    libraryDirectory: 'es',
    // style: true, # 这里不注释掉就无法使用less修改主题，这里的功能是样式按需加载
  }),
  addLessLoader({
    javascriptEnabled: true,
    // modifyVars: { '@primary-color': '#1DA57A' },
  }),
);

done