{
  "env": {
    "dev": {
      "presets": [
        "es2015",
        "stage-2"
      ]
    },
    "rollup": {
      "presets": [
        ["latest", {
          "es2015": {
            "modules": false
          }
        }
        ],
        "stage-2"
      ],
      "plugins": ["external-helpers"]
    }
  }
}