module.exports = {
  presets: [
    '@vue/app',
  ],
  plugins: [
    // 可选链插件, 其他babel插件也是一样的安装方式
    "@babel/plugin-proposal-optional-chaining",
    "@babel/plugin-proposal-nullish-coalescing-operator",
    "@babel/plugin-proposal-logical-assignment-operators"
  ]
}