element-ui-demand problem introduced modifications .babelrc

element-ui tips you need to .babelrc amended as follows:

"presets": [["es2015", { "modules": false }]],
  "plugins": [
    [
      "component",
      {
        "libraryName": "element-ui",
        "styleLibraryName": "theme-chalk"
      }
    ]
  ]
}

My vue-cli version 3.9.3, only babel.config.js create files in the project directory. Then modify the

module.exports = {
  presets: ["@vue/app", ["es2015", { modules: false }]],
  plugins: [
    [
      "component",
      {
        libraryName: "element-ui",
        styleLibraryName: "theme-chalk"
      }
    ]
  ]
};

After the modification, re npm run serve, error Error: Can not find module 'babel-preset-es2015'. Installation @ babel / preset-env

npm install --save-dev @babel/preset-env

And modify the file as follows .babel.config.js, after saving the successful run again:

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

Note: where have tried to use babel-preset-es2015, try using this command but will complain. After switching to @ babel / preset-env, this article compares the two, you can reference.

npm install --save-dev babel-preset-es2015

https://github.com/Gesj-yean/vue-demo-collection documented use more outstanding plug-ins. Students have time to look at my top blog can thank you very much.