.babelrc

{
  "presets": [
    [
      "@babel/preset-env",
      {
        "useBuiltIns": "usage",
        "corejs": {
          "version": "3",
          "proposals": true
        },
        "targets": {
          "ie": "11",
          "browsers": "last 2 versions"
        }
      }
    ]
  ]
}