Describe the bug

Bug: unplugin-auto-import fails to resolve @vueuse/core preset in pnpm monorepos when running vitest from root

In pnpm monorepos, unplugin-auto-import resolves preset modules from the calling context (root) instead of the workspace context where the vite.config.ts is located. This causes @vueuse/core preset resolution to fail when running npx vitest from the monorepo root.

The Issue:

• ✅ Works: vue, vue-router, pinia presets (different resolution logic)
• ❌ Fails: @vueuse/core preset (tries to resolve from root instead of workspace)

Error:

TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type string or an instance of Buffer or URL. Received undefined
Error: [auto-import] failed to load @vueuse/core, have you installed it?

Minimal reproduction: https://github.com/lucastraba/unplugin-auto-import-repro

Run pnpm reproduce-bug to see the issue - workspace tests pass but root tests fail due to incorrect module resolution context.

Reproduction

https://github.com/lucastraba/unplugin-auto-import-repro

System Info

System:
    OS: macOS 15.5
    CPU: (10) arm64 Apple M1 Max
    Memory: 93.17 MB / 64.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 22.14.0 - ~/.nvm/versions/node/v22.14.0/bin/node
    npm: 10.9.2 - ~/.nvm/versions/node/v22.14.0/bin/npm
    pnpm: 10.13.1 - ~/Library/pnpm/pnpm
    bun: 1.2.17 - ~/.bun/bin/bun
  Browsers:
    Chrome: 138.0.7204.158
    Edge: 135.0.3179.85
    Safari: 18.5

Used Package Manager

pnpm

Validations

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• The provided reproduction is a minimal reproducible of the bug.