Error occurred in Next.js turbopack with yarn berry.

[willofi]

Link to the code that reproduces this issue

https://github.com/jhnnxx/next-15-foxtrot

To Reproduce

1. Start dev (yarn dev : "next dev --turbo")
2. can't start next.js
3. ▲ Next.js 15.2.2 (Turbopack)

• Local: http://localhost:3000
• Network: http://10.184.51.17:3000
• Environments: .env.local, .env.development

✓ Starting...
FATAL: An unexpected Turbopack error occurred. Please report the content of /var/folders/v1/3fn16dv16559n3db2mjj5vjr0000gp/T/next-panic-db32d3be174de20fcd3e37b65674d012.log, along with a description of what you were doing when the error occurred, to https://github.com/vercel/next.js/issues/new?template=1.bug_report.yml
[Error [TurbopackInternalError]: Next.js package not found

Debug info:

• Execution of get_entrypoints_with_issues_operation failed
• Execution of EntrypointsOperation::new failed
• Execution of Project::entrypoints failed
• Execution of AppProject::routes failed
• Execution of directory_tree_to_entrypoints_internal failed
• Execution of directory_tree_to_loader_tree failed
• Execution of get_next_package failed
• Next.js package not found]

4. I'm using yarn 4.7.0 and next.js 15.2.2

Current vs. Expected behavior

be executing my dev process.

Provide environment information

Binaries:
  node: 20.19.0
  yarn: 4.7.0
  next.js: 15.2.2

Which area(s) are affected? (Select all that apply)

Turbopack

Which stage(s) are affected? (Select all that apply)

next dev (local)

Additional context

No response

[timneutkens]

Yarn PnP is not supported as documented: https://nextjs.org/docs/app/api-reference/turbopack#unsupported-and-unplanned-features

You're using PnP here: https://github.com/jhnnxx/next-15-foxtrot/blob/main/.yarnrc.yml#L2

[github-actions]

This closed issue has been automatically locked because it had no new activity for 2 weeks. If you are running into a similar issue, please create a new issue with the steps to reproduce. Thank you.