.babelrc

{
  "presets": [
    [
      "env",
      {
        "modules": false,
        "debug": false
      }
    ],
    "react"
  ],
  "plugins": [
    "transform-runtime",
    "transform-object-rest-spread",
    "transform-class-properties",
    "transform-decorators-legacy"
    // "syntax-dynamic-import"
    // "react-hot-loader/babel"
  ],
  "env": {
    // only enable it when process.env.NODE_ENV is 'development' or undefined
    "development": {
      "plugins": [
        [
          "react-transform",
          {
            "transforms": [
              {
                "transform": "react-transform-hmr",
                // if you use React Native, pass "react-native" instead:
                "imports": [
                  "react"
                ],
                // this is important for Webpack HMR:
                "locals": [
                  "module"
                ]
              }
            ]
          }
        ]
      ]
    }
  }
}