Nuxt server with docus crashes on start using vite-plus

[branislavjuhaas]

Describe the bug

I have created brand new repo with https://github.com/nuxt-content/docus and migrated it to vite-plus using vp migrate. Right after migration, running vp run dev, the dev server crashes on start with the following log:

juhas@juhaas:~/src/dn-juhaas$ vp run dev
VITE+ - The Unified Toolchain for the Web

$ nuxt dev ⊘ cache disabled
│                                                                                                                                               11:35:42 AM
●  Nuxt 4.4.8 (with Nitro 2.13.4, Vite 0.2.2 and Vue 3.5.39)
                                                                                                                                                11:35:42 AM
  ➜ Local:    http://localhost:3000/
  ➜ Network:  use --host to expose

  ➜ DevTools: press Shift + Alt + D in the browser (v3.2.4)                                                                                     11:35:43 AM

ℹ Nuxt Icon server bundle mode is set to local                                                                                                 11:35:44 AM
✔ /mcp enabled with 2 tools                                                                                                @nuxtjs/mcp-toolkit 11:35:44 AM
✔ Nuxt Icon loaded local collection custom with 0 icons                                                                              nuxt:icon 11:35:44 AM
✔ Nuxt Icon loaded local collection custom with 1 icons                                                                              nuxt:icon 11:35:44 AM
ℹ Nuxt Icon client bundle consist of 1 icons with 1.12KB(uncompressed) in size                                                                 11:35:44 AM
✔ Vite client built in 64ms                                                                                                                    11:35:45 AM
✔ Vite server built in 19ms                                                                                                                    11:35:45 AM
✔ Nuxt Nitro server built in 3524ms                                                                                                      nitro 11:35:49 AM
ℹ Vite server warmed up in 30ms                                                                                                                11:35:49 AM
ℹ Vite client warmed up in 31ms                                                                                                                11:35:49 AM

[nuxt 11:35:49 AM]  WARN  Using vite.config.ts is not supported together with Nuxt. Use options.vite instead. You can read more in https://nuxt.com/docs/4.x/api/nuxt-config#vite.


 ERROR  [uncaughtException] server.handleUpgrade() was called more than once with the same socket, possibly due to a misconfiguration           11:36:02 AM

    at WebSocketServer.completeUpgrade (node_modules/.pnpm/@voidzero-dev+vite-plus-core@0.2.2_@types+node@26.1.0_esbuild@0.28.1_jiti@2.7.0_terser@_9d71b72779cd636215a89380b61758f0/node_modules/@voidzero-dev/vite-plus-core/dist/vite/node/chunks/node.js:21218:34)
    at WebSocketServer.handleUpgrade (node_modules/.pnpm/@voidzero-dev+vite-plus-core@0.2.2_@types+node@26.1.0_esbuild@0.28.1_jiti@2.7.0_terser@_9d71b72779cd636215a89380b61758f0/node_modules/@voidzero-dev/vite-plus-core/dist/vite/node/chunks/node.js:21201:9)
    at handleUpgrade (node_modules/.pnpm/@voidzero-dev+vite-plus-core@0.2.2_@types+node@26.1.0_esbuild@0.28.1_jiti@2.7.0_terser@_9d71b72779cd636215a89380b61758f0/node_modules/@voidzero-dev/vite-plus-core/dist/vite/node/chunks/node.js:21479:7)
    at Server.hmrServerWsListener (node_modules/.pnpm/@voidzero-dev+vite-plus-core@0.2.2_@types+node@26.1.0_esbuild@0.28.1_jiti@2.7.0_terser@_9d71b72779cd636215a89380b61758f0/node_modules/@voidzero-dev/vite-plus-core/dist/vite/node/chunks/node.js:21496:88)
    at Server.emit (node:events:521:24)
    at onParserExecuteCommon (node:_http_server:1042:14)
    at onParserExecute (node:_http_server:946:3)

Reproduction

I was not able to create reproduction in stackblitz due to not being able to install viteplus, so this is my reproduction: https://github.com/branislavjuhaas/dn-juhaas/tree/v3

Steps to reproduce

Run vp i and vp run dev

System Info

VITE+ - The Unified Toolchain for the Web

Environment:
  Version  24.18.0
  Source   lts

Tool Paths:
  node  /home/juhas/.vite-plus/js_runtime/node/24.18.0/bin/node
  npm   /home/juhas/.vite-plus/js_runtime/node/24.18.0/bin/npm
  npx   /home/juhas/.vite-plus/js_runtime/node/24.18.0/bin/npx

Package Manager:
  Name          pnpm
  Version       11.10.0
  Source        devEngines.packageManager
  Source Path   /home/juhas/src/dn-juhaas/package.json
  Project Root  /home/juhas/src/dn-juhaas
  Bin Path      /home/juhas/.vite-plus/package_manager/pnpm/11.10.0/pnpm/bin/pnpm

vp v0.2.2

Local vite-plus:
  vite-plus  v0.2.2

Tools:
  vite             v8.1.2
  rolldown         v1.1.4
  vitest           v4.1.9
  oxfmt            v0.57.0
  oxlint           v1.72.0
  oxlint-tsgolint  v0.24.0
  tsdown           v0.22.3

Environment:
  Package manager  pnpm v11.10.0
  Node.js          v24.18.0

Used Package Manager

pnpm

Logs

Validations

• Read the Contributing Guidelines.
• Check that there isn't already an issue for the same bug.
• Confirm this is a Vite+ issue and not an upstream issue (Vite, Vitest, tsdown, Rolldown, or Oxc).
• The provided reproduction is a minimal reproducible example.