.babelrc

{
  "plugins": [
    "@babel/plugin-proposal-optional-chaining",
    "@babel/plugin-proposal-class-properties",
    "lodash"
  ],
  "presets": [
    "@babel/preset-env",
    "@babel/preset-react",
    "@babel/preset-typescript"
  ],
  "env": {
    "production": {
      "presets": [
        [
          "@babel/preset-env",
          {
            "useBuiltIns": "usage",
            "corejs": {
              "version": 3,
              "proposals": true
            }
          }
        ]
      ],
      "plugins": []
    },
    "test": {
      "presets": [
        [
          "@babel/preset-env",
          {
            "targets": {
              "node": "current"
            }
          }
        ]
      ],
      "plugins": [
        "istanbul"
      ]
    }
  }
}