Let the Vue CLI support optional chain operators

First of all,

npm i -D @babel/plugin-proposal-optional-chaining
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then

Add @babel/plugin-proposal-optional-chaining to plugins in babel.config.js

module.exports = {
  presets: [
    '@vue/app'
  ],
  plugins: [
+ "@babel/plugin-proposal-optional-chaining",
    [
      "component",
      {
        "libraryName": "element-ui",
        "styleLibraryName": "theme-chalk"
      }
    ]
  ]
}

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The last

npm run dev
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