babel.config.json

{
  "babelrcRoots": [
    ".",
    "./packages/*"
  ],
  "env": {
    "production": {
      "presets": [
        "@babel/preset-env",
        "@babel/preset-react"
      ],
      "plugins": [
        "@babel/plugin-proposal-class-properties",
        "@babel/plugin-proposal-export-default-from",
        "@babel/plugin-proposal-optional-chaining",
        "@babel/plugin-proposal-nullish-coalescing-operator"
      ]
    },
    "development": {
      "presets": [
        "@babel/preset-env",
        "@babel/preset-react"
      ],
      "plugins": [
        "@babel/plugin-proposal-class-properties",
        "@babel/plugin-proposal-export-default-from",
        "@babel/plugin-proposal-optional-chaining",
        "@babel/plugin-proposal-nullish-coalescing-operator"
      ]
    },
    "es": {
      "presets": [
        [
          "@babel/preset-env",
          {
            "modules": false
          }
        ],
        "@babel/preset-react"
      ],
      "plugins": [
        "@babel/plugin-proposal-class-properties",
        "@babel/plugin-proposal-export-default-from",
        "@babel/plugin-proposal-optional-chaining",
        "@babel/plugin-proposal-nullish-coalescing-operator"
      ]
    }
  }
}