{
  "presets": [ //环境预设，是一组集成的plugin，一般是官方提供
    [
      "@babel/preset-env",
      {
        "targets": {
          "chrome": "67",
        },
        "useBuiltIns": "usage", // 做@babel/polyfill补充时，按需补充
        "corejs": "2",
      }
    ],
    "@babel/preset-react",
    [
      "@babel/preset-typescript",
      {
        "isTSX": true,
        "allExtensions": true,
      }
    ],
  ],
  "plugins": [
    [
      "@babel/plugin-proposal-decorators",
      {
        "legacy": true
      },
      "@babel/plugin-transform-runtime", //减少冗余代码，必须放在类装饰器之后
    ],
    [
      "import",
      {
        "libraryName": "antd",
        "libraryDirectory": "es",
        "style": "css" // `style: true` 会加载 less 文件
      }
    ],
    "@babel/plugin-proposal-class-properties",
    "dva-hmr"
  ]
}