webpackでBabelを使う 自分用

npm i -D @babel/core @babel/preset-env @babel/polyfill babel-loader

  module: {
    rules: [
      {
        test: /\.js$/,
        use: [
          {
            loader: 'babel-loader'
          }
        ]
      }
    ]
  }

{
  "presets": [
    [
      "@babel/preset-env",
      {
        "useBuiltIns": "entry"
      }
    ]
  ]
}