{
  "2": {
    "polyfills": [
      "es6.object.to-string",
      "es6.promise"
    ],
    "flags": {
      "usesRegenerator": true
    }
  },
  "3": {
    "polyfills": [
      "es.promise",
      "es.object.to-string"
    ],
    "flags": {
      "usesRegenerator": true
    }
  }
}