{
  "presets": [
    ["@babel/preset-env", {
      "targets": {
        "browsers": [
          "last 2 versions",
          "ie >= 10"
        ]
      },
      "useBuiltIns": "entry"
    }]
  ],
  "plugins": [
    ["transform-class-properties", { "spec": true }],
    "transform-object-assign"
  ]
}