Inside a monorepo `nuxt/test-utils` ignores provided runner

[daugvinasr]

Environment

• Operating System: Darwin
• Node Version: v22.14.0
• Nuxt Version: -
• CLI Version: 3.25.1
• Nitro Version: -
• Package Manager: pnpm@10.11.0
• Builder: -
• User Config: -
• Runtime Modules: -
• Build Modules: -

Reproduction

https://github.com/daugvinasr/nuxt-repro

Describe the bug

Inside a monorepo nuxt/test-utils ignores provided runner (jsdom) and always defaults to happy-dom.

vitest.config.ts

import { defineVitestConfig } from '@nuxt/test-utils/config'

export default defineVitestConfig({
  test: {
    runner: 'jsdom',
    include: ['**\/*.{test,spec}.?(c|m)[jt]s?(x)']
  }
})

Logs

➜  nuxt-repro git:(main) pnpm --filter iframe test

> iframe@ test /Users/daugvinas/Projects/nuxt-repro/apps/iframe
> vitest


 DEV  v3.1.4 /Users/daugvinas/Projects/nuxt-repro/apps/iframe

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Vitest caught 1 unhandled error during the test run.
This might cause false positive tests. Resolve unhandled errors to make sure your tests are not affected.

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TypeError: TestRunner is not a constructor
 ❯ resolveTestRunner ../../node_modules/.pnpm/vitest@3.1.4_@types+node@22.15.19_jiti@2.4.2_jsdom@26.1.0_terser@5.39.2_yaml@2.8.0/node_modules/vitest/dist/chunks/index.Cu2UlluP.js:38:21
 ❯ processTicksAndRejections node:internal/process/task_queues:105:5
 ❯ run ../../node_modules/.pnpm/vitest@3.1.4_@types+node@22.15.19_jiti@2.4.2_jsdom@26.1.0_terser@5.39.2_yaml@2.8.0/node_modules/vitest/dist/chunks/runBaseTests.BV8m0B-u.js:106:17
 ❯ runBaseTests ../../node_modules/.pnpm/vitest@3.1.4_@types+node@22.15.19_jiti@2.4.2_jsdom@26.1.0_terser@5.39.2_yaml@2.8.0/node_modules/vitest/dist/chunks/base.DslwPSCy.js:35:2
 ❯ ForksBaseWorker.executeTests ../../node_modules/.pnpm/vitest@3.1.4_@types+node@22.15.19_jiti@2.4.2_jsdom@26.1.0_terser@5.39.2_yaml@2.8.0/node_modules/vitest/dist/workers/forks.js:27:4
 ❯ execute ../../node_modules/.pnpm/vitest@3.1.4_@types+node@22.15.19_jiti@2.4.2_jsdom@26.1.0_terser@5.39.2_yaml@2.8.0/node_modules/vitest/dist/worker.js:113:3
 ❯ onMessage ../../node_modules/.pnpm/tinypool@1.0.2/node_modules/tinypool/dist/entry/process.js:55:20

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 Test Files   (1)
      Tests  no tests
     Errors  1 error
   Start at  10:09:06
   Duration  331ms (transform 21ms, setup 0ms, collect 0ms, tests 0ms, environment 0ms, prepare 0ms)

 FAIL  Tests failed. Watching for file changes...
       press h to show help, press q to quit