{
  "presets": [
    ["env", {
      "targets": {
        "browsers": ["last 2 versions", "safari >= 8"]
      },
      "modules": false,
      "useBuiltIns": false,
      "debug": false
    }]
  ],
  "plugins": ["external-helpers", "transform-object-assign"],
  "env": {
    "test": {
      "presets": ["env"],
      "plugins": ["external-helpers", "transform-runtime" ]
    }
  }
}