异步获取配置不生效

[xuebear]

Describe the bug

文件：config.mts

我给箭头位置打印日志 没有输出

Reproduction

import { defineConfig } from 'vitepress'

export default async () => {
console.log('开始请求数据...')
const posts = await (await fetch('http://127.0.0.1:9001/dagent/vite/userInfo')).json()
console.log(posts)

return defineConfig({
// 应用级配置选项
lang: 'en-US',
title: 'VitePress',
description: 'Vite & Vue powered static site generator.',

// 主题级配置选项
themeConfig: {
  sidebar: [
    // ...posts.map((post) => ({
    //   text: post,
    // }))
  ]
}

})
}

Expected behavior

无

System Info

无

Additional context

No response

Validations

• Check if you're on the latest VitePress version.
• Follow our Code of Conduct
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.