exiguus/js.polyfill.preload.onload

{
    "presets": [
      ["env", {
        "modules": false,
        "targets": {
          "browsers": ["> 1%", "last 2 versions", "not ie <= 8"]
        }
      }],
      "stage-2"
    ],
    "env": {
      "test": {
        "presets": ["env", "stage-2"],
      }
    }
  }