"babel": {
    "presets": [
      "react-app"
    ],
    "plugins": [
      ["import", {
        "libraryName": "antd",
        "libraryDirectory": "es",
        "style": true
      }]
    ]
  }

const cssRegex = /\.css$/;
const cssModuleRegex = /\.module\.css$/;
const sassRegex = /\.(scss|sass)$/;
const sassModuleRegex = /\.module\.(scss|sass)$/;
//依照sass添加less
const lessRegex = /\.less$/;
const lessModuleRegex = /\.module\.less$/;

... 
//复制sass的解析相应的修改为less即可

{
      test: lessRegex,
      exclude: lessModuleRegex,
      use: getStyleLoaders(
          {
              importLoaders: 2,
              sourceMap: isEnvProduction && shouldUseSourceMap,
          },
          'less-loader'
      ),
      sideEffects: true,
  },
  {
      test: lessModuleRegex,
      use: getStyleLoaders(
          {
              importLoaders: 2,
              sourceMap: isEnvProduction && shouldUseSourceMap,
              modules: true,
              getLocalIdent: getCSSModuleLocalIdent,
          },
          'less-loader'
      ),
  },