.babelrc

{
  "presets": [
    [
      "@babel/preset-env",
      {
        "targets": {
          "browsers": ["ie >= 11"]
        }
      }
    ],
    "@babel/preset-react"
  ],
  "plugins": [
    "@babel/plugin-syntax-bigint",
    "@babel/plugin-proposal-class-properties",
    "@babel/plugin-proposal-do-expressions",
    "@babel/plugin-proposal-export-default-from",
    "@babel/plugin-proposal-logical-assignment-operators",
    "@babel/plugin-proposal-nullish-coalescing-operator",
    "@babel/plugin-proposal-object-rest-spread",
    "@babel/plugin-proposal-optional-chaining",
    "@babel/plugin-transform-object-assign"
  ],
  "env": {
    "test": {
      "plugins": [
        "@babel/plugin-transform-runtime"
      ]
    }
  }
}