.babelrc

{
  "presets": [
    ["env", {
      "modules": false,
      "targets": {
        "browsers": [
          "> 1%",
          "last 2 versions",
          "not ie <= 20",
          "not ie_mob <= 100",
          "not ff <= 100",
          "not and_ff <= 100",
          "not Edge <= 100",
          "Android >= 4.0"
        ]
      }
    }],
    "stage-2"
  ],
  "plugins": ["transform-runtime", "add-module-exports", "transform-es2015-modules-umd"],
  "comments": false,
  "env": {
    "test": {
      "presets": ["env", "stage-2"],
      "plugins": [ "istanbul" ]
    }
  }
}