.babelrc

{
  "parserOpts": {
    // Allow returns in the module
    "allowReturnOutsideFunction": true
  },

  "env": {
    "ava": {
      "sourceMaps": "inline",
      "plugins": [
        "transform-es2015-modules-commonjs",
        "transform-class-properties",
        "transform-object-rest-spread",
        "transform-exponentiation-operator",
        "transform-async-to-generator",
        "syntax-trailing-function-commas",
        "transform-inline-environment-variables", [
          "transform-runtime", {
            "regenerator": true
          }
        ]
      ]
    },

    "rollup": {
      "plugins": [
        "transform-class-properties",
        "transform-object-rest-spread",
        "transform-exponentiation-operator",
        "transform-async-to-generator",
        "syntax-trailing-function-commas",
        "transform-inline-environment-variables", [
          "transform-runtime", {
            "regenerator": true
          }
        ]
      ]
    }
  }
}