.babelrc

{
  "presets": [["@babel/preset-env", { "targets": { "node": "current" } }]],
  "plugins": [
    "syntax-dynamic-import",
    ["@vue/babel-plugin-jsx"],
    "@babel/plugin-proposal-optional-chaining",
    "@babel/plugin-proposal-nullish-coalescing-operator"
  ],
  "env": {
    "utils": {
      "presets": [
        [
          "env",
          {
            "loose": true,
            "modules": "commonjs",
            "targets": {
              "browsers": ["> 1%", "last 2 versions", "not ie <= 8"]
            }
          }
        ]
      ],
      "plugins": [
        [
          "module-resolver",
          {
            "root": ["element-ui"],
            "alias": {
              "element-ui/src": "element-ui/lib"
            }
          }
        ]
      ]
    },
    "test": {
      "plugins": ["istanbul"],
      "presets": [["env", { "targets": { "node": "current" } }]]
    },
    "esm": {
      "presets": [["@babel/preset-env", { "modules": false }]]
    }
  }
}