// Source:
// https://github.com/gaearon/react-transform-hmr/tree/f22f9a938ed295e0c5ebe756d73fdae4c3a6fdef
{
  "env": {
    // only enable it when process.env.NODE_ENV is 'development' or undefined
    "development": {
      "plugins": ["react-transform"],
      "extra": {
        // must be defined and be an array
        "react-transform": [{
          "target": "react-transform-hmr",
          // if you use React Native, pass "react-native" instead:
          "imports": ["react"],
          // this is important for Webpack HMR:
          "locals": ["module"]
        }]
        // note: you can put more transforms into array
        // this is just one of them!
      }
    }
  }
}