current babel setup

setup

{
  "presets": [
    [
      "env",
      {
        "targets": {
          "browsers": [
            "> 1%",
            "last 2 versions",
            "Firefox ESR",
            "IE 10",
            "IE 11"
          ]
        }
      }
    ],
    "react",
    "es2015",
    "stage-1"
  ],
  "plugins": [
    "transform-class-properties",
    "transform-export-extensions",
    "transform-object-rest-spread",
    "transform-object-assign"
  ],
  "env": {
    "test": {
      "plugins": ["transform-es2015-modules-commonjs"]
    }
  }
}