.babelrc

{
  "presets": [
    "es2015"
  ],
  "plugins": [
    "syntax-flow",
    "transform-flow-strip-types"
  ],
  "env": {
    "development": {
      "presets": [
        "power-assert"
      ],
      "plugins": [
        "auto-import-assert",
        "typecheck"
      ]
    },
    "production": {
      "plugins": [
        "unassert"
      ]
    }
  }
}