@ryusei/code/.babelrc

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{
  "presets": [
    [
      "@babel/preset-env",
      {
        "modules": "umd",
        "loose": true,
        "targets": {
          "ie": "11"
        }
      }
    ]
  ],
  "env": {
    "test": {
      "presets": [
        [
          "@babel/preset-env"
        ]
      ]
    }
  }
}