guide/front/.babelrc

{
  "presets": [
    ["@babel/env", {
      "targets": {
        "browsers": ["last 3 versions", "> 2%", "ie >= 10", "Firefox >= 30", "Chrome >= 30"]
      },
      "modules": false,
      "loose": true,
      "useBuiltIns": "entry"
    }]
  ],
  "plugins": [
    "@babel/plugin-transform-runtime",
    "@babel/plugin-syntax-dynamic-import"
  ],
  "env": {
    "test": {
      "plugins": ["transform-es2015-modules-commonjs"]
    }
  }
}