.babelrc

{
  "presets": [
    ["env", {
      "loose": true,
      "modules": false,
      "targets": {
        "browsers": ["last 5 versions", "safari >= 6"]
      }
    }],
    "react",
    "stage-2"
  ],
  "plugins": [
    ["transform-runtime", {
      "helpers": false,
      "polyfill": true,
      "regenerator": true,
      "moduleName": "babel-runtime"
    }],
    "transform-flow-strip-types",
  ],
  "env": {
    "TEST": {
      "presets": [ "env", "react", "stage-2" ],
    }
  }
}