Describe the bug

@vue/test-utils fails to find @vue/compiler-dom when testing components with slots in a pnpm workspace with strict hoist settings (hoist: false and shamefullyHoist: false).

The error occurs because @vue/compiler-dom is not listed in @vue/test-utils's peerDependencies, so pnpm cannot properly resolve it in strict hoist mode. This issue specifically manifests when using the slots option in mount(), as @vue/test-utils requires @vue/compiler-dom to compile slot content.

Reproduction

I've created a GitHub repository for reproduction instead of StackBlitz, as setting up pnpm's strict hoist configuration in StackBlitz proved challenging.

https://github.com/kimulaco/vue-test-utils-peer-dependencies-example

To reproduce:

1. Clone the repository
2. Run pnpm install
3. Run pnpm test

Error output:

Error: Cannot find module `@vue/compiler-dom`
Require stack:
- node_modules/.pnpm/@vue+test-utils@2.4.6/node_modules/`@vue/test-utils`/dist/vue-test-utils.cjs.js

You can also verify this error in CI: https://github.com/kimulaco/vue-test-utils-peer-dependencies-example/actions/runs/20521381439/job/58957183490

Expected behavior

@vue/test-utils should be able to resolve @vue/compiler-dom when testing components with slots. Adding @vue/compiler-dom to @vue/test-utils's peerDependencies would allow pnpm to properly resolve the dependency in strict hoist environments.

Environment

System:
    OS: macOS 26.1
    CPU: (8) arm64 Apple M2
    Memory: 350.02 MB / 16.00 GB
    Shell: 5.9 - /bin/zsh
npmPackages:
    @vue/test-utils: ^2.4.6 => 2.4.6 
    vitest: ^4.0.16 => 4.0.16 
    vue: ^3.5.26 => 3.5.26 

Additional context

This issue occurs specifically with pnpm's strict hoist configuration (hoist: false, shamefullyHoist: false) when testing components that use slots. The error only manifests when using the slots option in mount(), as @vue/test-utils requires @vue/compiler-dom to compile slot content.

A workaround exists using pnpm's packageExtensions feature, which is demonstrated in the solution branch: https://github.com/kimulaco/vue-test-utils-peer-dependencies-example/tree/refs/heads/solution

The solution branch shows that adding @vue/compiler-dom to peerDependencies via packageExtensions resolves the issue: https://github.com/kimulaco/vue-test-utils-peer-dependencies-example/actions/runs/20521490248/job/58957444615

However, this should be fixed at the package level by adding @vue/compiler-dom to @vue/test-utils's peerDependencies in package.json.

Note: There is a similar issue #2107 related to yarn berry. While the symptoms appear similar (missing @vue/compiler-dom), it's unclear if this is the same root cause since yarn and pnpm handle dependency resolution differently. I'm filing this as a separate issue for pnpm specifically, but they may be related and could potentially be resolved by the same fix.

I'm happy to create a PR to add @vue/compiler-dom to peerDependencies if this is confirmed as a bug.