vite打包异常，错误信息如下：

[vite]: Rollup failed to resolve import "element-plus/es/components" from "node_modules/element-plus/es/index.js".
This is most likely unintended because it can break your application at runtime.
If you do want to externalize this module explicitly add it to
`build.rollupOptions.external`
error during build:
Error: [vite]: Rollup failed to resolve import "element-plus/es/components" from "node_modules/element-plus/es/index.js".
This is most likely unintended because it can break your application at runtime.
If you do want to externalize this module explicitly add it to
`build.rollupOptions.external`
    at onRollupWarning (/Users/wuqian-mac-mini/Desktop/wuqianWork/nwdGitlab/cxqdjf/yz/change-wechat-web/node_modules/vite/dist/node/chunks/dep-6c23b6f8.js:51247:19)
    at onwarn (/Users/wuqian-mac-mini/Desktop/wuqianWork/nwdGitlab/cxqdjf/yz/change-wechat-web/node_modules/vite/dist/node/chunks/dep-6c23b6f8.js:51032:13)
    at Object.onwarn (/Users/wuqian-mac-mini/Desktop/wuqianWork/nwdGitlab/cxqdjf/yz/change-wechat-web/node_modules/rollup/dist/shared/rollup.js:23216:13)
    at ModuleLoader.handleResolveId (/Users/wuqian-mac-mini/Desktop/wuqianWork/nwdGitlab/cxqdjf/yz/change-wechat-web/node_modules/rollup/dist/shared/rollup.js:22466:26)
    at /Users/wuqian-mac-mini/Desktop/wuqianWork/nwdGitlab/cxqdjf/yz/change-wechat-web/node_modules/rollup/dist/shared/rollup.js:22427:26

解决，在vite.config.js 里添加：

import { defineConfig } from 'vite'
import vue from '@vitejs/plugin-vue'
import path from 'path'
import Components from 'unplugin-vue-components/vite';
import { VantResolver } from 'unplugin-vue-components/resolvers';

export default defineConfig({
  plugins: [
    vue(),
    Components({
      resolvers: [VantResolver()],
    }),
  ],
  resolve: {
    alias: [
      {
        find: '@',
        replacement: path.resolve(__dirname, 'src')
      }
    ]
  },
  build: {
    rollupOptions: {
      external: [
          "element-plus"
      ]
    }
  }
})

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