element 按需引入一个小问题

module.exports = {
  presets: [
    '@vue/cli-plugin-babel/preset',["@babel/preset-env", { "modules": false }]
  ],
  plugins: [
      [
        "component",
        {
          "libraryName": "element-ui",
          "styleLibraryName": "theme-chalk"
        }
      ]
    ]
}