(0 , __vite_ssr_import_0__.defineVaporComponent) is not a function

Describe the bug

VaporInteropPlugin has been set up in Vue Main

After adding vapor to the script in Vue SFC, running Vitest to execute the test results in an error

<script setup vapor lang="ts">

vue SFC script remove vapor

<script setup lang="ts">

Reproduction

vue-vapor-component

System Info

System:
    OS: Windows 11 10.0.26200
    CPU: (16) x64 AMD Ryzen 7 5700U with Radeon Graphics
    Memory: 2.66 GB / 15.34 GB
  Binaries:
    Node: 22.16.0 - D:\Program Files\nodejs\node.EXE
    npm: 10.9.2 - D:\Program Files\nodejs\npm.CMD
    pnpm: 10.26.2 - D:\Program Files\nodejs\pnpm.CMD
  Browsers:
    Chrome: 143.0.7499.170
    Edge: Chromium (140.0.3485.54)
    Firefox: 144.0.2 - C:\Program Files\Mozilla Firefox\firefox.exe
    Internet Explorer: 11.0.26100.7309

Used Package Manager

pnpm

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.

Start with the linked vue-vapor-component reproduction and its Vitest configuration, then trace how VaporInteropPlugin handles the Vue SFC containing <script setup vapor lang="ts">. Compare the failing Vitest run with the same component without vapor; done means the vapor component executes successfully under Vitest without the defineVaporComponent error.