.babelrc

{
  "env": {
    "commonjs": {
      "presets": ["env"],
      "plugins": [
        "transform-runtime",
        "transform-react-jsx",
        "transform-class-properties",
        "transform-object-rest-spread"
      ]
    },
    "es": {
      "presets": [
        [
          "env",
          { "modules": false }
        ]
      ],
      "plugins": [
        "transform-runtime",
        "transform-react-jsx",
        "transform-class-properties",
        "transform-object-rest-spread"
      ]
    },
    "with_react_hot_loader": {
      "presets": ["env"],
      "plugins": [
        "react-hot-loader/babel",
        "transform-runtime",
        "transform-react-jsx",
        "transform-class-properties",
        "transform-object-rest-spread"
      ]
    }
  }
}