ninglu-frontt/.babelrc

{
  "presets": ["@babel/preset-env"],
  "plugins": [
    "@babel/plugin-proposal-optional-chaining",
    "@babel/plugin-proposal-nullish-coalescing-operator"
  ],
  "env": {
    "test": {
      "presets": ["@babel/preset-env"],
      "plugins": [
        "@babel/plugin-proposal-optional-chaining",
        "@babel/plugin-proposal-nullish-coalescing-operator"
      ]
    }
  }
}