.babelrc

{
  "env": {
    "development": {
      "presets": ["@babel/preset-env", "@babel/preset-react"],
      "plugins": [
        "@babel/plugin-proposal-class-properties",
        "react-hot-loader/babel",
        "@babel/plugin-syntax-dynamic-import"
      ]
    },
    "production": {
      "presets": [
        [
          "@babel/preset-env",
          {
            "targets": {
              "ie": 9
            },
            "forceAllTransforms": true
          }
        ],
        "@babel/preset-react"
      ],
      "plugins": [
        "@babel/plugin-proposal-class-properties",
        "@babel/plugin-transform-react-constant-elements",
        "transform-react-remove-prop-types",
        "@babel/plugin-syntax-dynamic-import"
      ]
    },
    "test": {
      "presets": ["@babel/preset-env", "@babel/preset-react"],
      "plugins": ["@babel/plugin-proposal-class-properties"]
    }
  }
}