vue-cli3插件有写过吗？怎么写一个代码生成插件？

"```markdown Vue CLI 3 allows developers to create custom plugins to extend its functionality. To create a code generation plugin, follow these steps:

1. Create a new Vue CLI project or use an existing one.
2. Create a new directory for your plugin and initialize it with npm.
3. Inside the plugin directory, create a generator directory.
4. In the generator directory, create an index.js file where you will define the code generation logic.

module.exports = (api, options, rootOptions) => {
  api.render('./template', {
    ...options
  });
};

5. Create a template directory inside the generator directory. This directory will contain the template files that will be used for code generation.
6. Define the template files for code generation inside the template directory.
7. Update the index.js file to include logic for copying template files to the project directory.

module.exports = (api, options, rootOptions) => {
  api.render('./template', {
    ...options
  });

  api.onCreateComplete(() => {
    // Copy template files to project directory
    api.render('./template', {
      ...options
    });
  });
};

8. Register the plugin in your Vue CLI project by updating the vue.config.js file.

module.exports = {
  chainWebpack: config => {
    config.plugin('my-code-generator').use(require('./path/to/plugin'));
  }
};

9. Test the plugin by running vue invoke my-code-generator in the project directory.

By following these steps, you can create a custom code generation plugin for Vue CLI 3. This allows you to automate repetitive tasks and streamline your development workflow.