vite separate config file resolve problem

[lavitalite]

Describe the bug

separate vite config file is not resolve as expected

Reproduction

// .vitepress/config.ts

export default defineConfig({
  srcDir: 'content',
  base: BASE_PATH,
  outDir: 'dist',
  cacheDir: 'cache',
  markdown: {
    config: (md) => {
      md.use(groupIconMdPlugin)
    }
  },
  themeConfig: {
    // theme-level options
  }
})

running DEBUG=vite:config,vite:resolve,vite:debug-alias vitepress dev

debug info showing vitepress config as expect

  vite:config   vitepress: {
  vite:config     root: '/Users/ayao/repos/vita-ui/packages/docs',
  vite:config     srcDir: '/Users/ayao/repos/vita-ui/packages/docs/content',

but separate vite config is not respect(i expect it to be /Users/ayao/repos/vita-ui/packages/docs`

which is where the script is running and the separate config file vite.config.ts root field is config like that
root: __dirname,

  vite:config bundled config file loaded in 34.09ms +0ms
  vite:config no config file found. +53ms
  vite:config using resolved config: {
  vite:config   root: '/Users/ayao/repos/vita-ui/packages/docs/content',
  vite:config   base: '/wiki/',
  vite:config   cacheDir: '/Users/ayao/repos/vita-ui/packages/docs/cache',
  vite:config   plugins: [

my viteconfig as following

import { defineConfig, createLogger } from 'vite'
import path, { resolve } from 'path'
import { fileURLToPath } from 'node:url'

import Components from 'unplugin-vue-components/vite'
import AutoImport from 'unplugin-auto-import/vite'
import Inspect from 'vite-plugin-inspect'
import { groupIconVitePlugin, localIconLoader } from 'vitepress-plugin-group-icons'


const __filename = fileURLToPath(import.meta.url)
const __dirname = path.dirname(__filename)
const logger = createLogger();

export default defineConfig({
  optimizeDeps: {
    exclude: [
      'vitepress',
    ],
  },
  logLevel: 'info',
  clearScreen: false,
  resolve: {
    alias: {
      "@utils": resolve(__dirname, "./utils"),
      "@": resolve(__dirname, "./content"),
      "@oss": resolve(__dirname, "./oss"),
    }
  },
  plugins: [
    {
      name: 'vite:debug-alias',
      configResolved(config) {
        debugger
        logger.info(`Alias config: ${JSON.stringify(config.resolve.alias)}`);
      },
      resolveId(id) {
        if (id.startsWith('@utils')) {
          logger.info(`Resolving @utils path: ${id}`);
        }
      },
    },
    Inspect({
      build: true,
      dev: true,
      outputDir: '.vite-inspect',
    }),
    Components({
      dirs: [
        "components",
      ],
      include: [
        /\.vue$/,
        /\.vue\?vue/,
      ],
      dts: "components.d.ts"
    }),
    AutoImport({
      imports: ["vue", "@vueuse/core"],
      dirs: ["composables"],
      vueTemplate: true,
      dts: "auto-imports.d.ts"
    }),
    groupIconVitePlugin({
      customIcon: {
        'docker': 'vscode-icons:file-type-docker2',
        'k8s': localIconLoader(import.meta.url, './assets/devicon--kubernetes.svg'),
        'dir': localIconLoader(import.meta.url, './assets/mingcute--directory-line.svg'),
        'bnf': localIconLoader(import.meta.url, './assets/file-icons--bnf.svg'),
      },
    }),

  ],
})

Expected behavior

all my plugin didn't register in merge config

 plugins: [
  vite:config     'vite:optimized-deps',
  vite:config     'vite:watch-package-data',
  vite:config     'vite:pre-alias',
,,,
 ]

 ~  tree -L 2
├── content
│   └── index.md
├── logs
│   └── debug.log
└── vite.config.ts
├── .vitepress
│   └── config.ts

one thing to know that the separte vite config is respect if config srcDir to cwd(meaning leaving empty with default)
the separate vite config will be respect and all the plugin is register successfully
but i prefer flat structure, wish to pull all my markdown file in content direcotry, so i was hoping this issue could be resolve

System Info

~  npx envinfo --system --npmPackages vitepress --binaries --browsers

  System:
    OS: macOS 14.4
    CPU: (8) arm64 Apple M1
    Memory: 90.00 MB / 8.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 20.18.1 - ~/n/bin/node
    npm: 10.8.2 - ~/n/bin/npm
    pnpm: 9.15.2 - ~/n/bin/pnpm
    Watchman: 2024.12.02.00 - /opt/homebrew/bin/watchman
  Browsers:
    Chrome Canary: 133.0.6933.0
    Safari: 17.4
  npmPackages:
    vitepress: catalog: => 1.5.0

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.

[brc-dd]

vite.config.ts should be inside srcDir for auto-discovery to work.

You can customize vite.configFile in vitepress settings if you want to keep it outside:

// .vitepress/config.ts

export default defineConfig({
  srcDir: 'content', // relative to root
  vite: {
    configFile: 'vite.config.ts' // relative to cwd
                                 // you can use fileURLToPath(import.meta.resolve('../vite.config.mts'))
                                 // if you want it to be relative to file
  }
})