.babelrc

{
  "presets": [
    "es2015-loose",
    "react",
    "stage-0"
  ],
  "env": {

    // this plugin will be included only in development mode, e.g.
    // if NODE_ENV (or BABEL_ENV) environment variable is not set
    // or is equal to "development"
    "development": {
      "plugins": [
        // must be an array with options object as second item
        [
          "react-transform",
          {
            // must be an array of objects
            "transforms": [
              {
                // can be an NPM module name or a local path
                "transform": "react-transform-hmr",
                // see transform docs for "imports" and "locals" dependencies
                "imports": [
                  "react"
                ],
                "locals": [
                  "module"
                ]
              }
            ]
            // by default we only look for `React.createClass` (and ES6 classes)
            // but you can tell the plugin to look for different component factories:
            // factoryMethods: ["React.createClass", "createClass"]
          }
        ]
      ]
    }
  }
}