{
  "presets": [
    [
      "env",
      {
        "modules": false,
        "targets": {
          "browsers": [
            "last 2 versions",
            "safari >= 7",
            "ie >= 9"
          ]
        }
      }
    ]
  ],
  "plugins": [
    "transform-decorators-legacy",
    [
      "transform-es2015-classes",
      {
        "loose": true
      }
    ],
    "transform-proto-to-assign"
  ]
}