guide/front/.babelrc

{
  "presets": [
    ["env", {
      "targets": {
        "browsers": ["last 3 versions", "> 2%", "ie >= 10", "Firefox >= 30", "Chrome >= 30"]
      },
      "modules": false,
      "loose": true,
      "useBuiltIns": true
    }],
    "stage-2"
  ],
  "plugins": [
    "transform-runtime"
  ],
  "env": {
    "test": {
      "plugins": ["transform-es2015-modules-commonjs"]
    }
  }
}