babel/packages/babel-plugin-proposal-class-properties/test/fixtures/private/native-classes/options.json

{
  "plugins": [
    [
      "external-helpers",
      {
        "helperVersion": "7.0.1"
      }
    ],
    "proposal-class-properties",
    "transform-block-scoping",
    "syntax-class-properties"
  ]
}