[rush] Next.js 16.1 uses symbolic links for its serverExternalPackages which conflicts with Rush.js caching

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#5,583 opened on Jan 31, 2026 2 comments 1 reaction 0 assignees View on GitHub

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Assessment

Difficulty: 4/5
Estimated time: 3-5 days
Newbie friendliness: 25/100

Issue type: Bug
Clarity: Needs clarification
Activity status: Stale
Tech stack: next.js, node.js
Domain: build-system, tooling

Research direction

Start with the linked reproduction at github.com/eliw00d/next-rush-16-1-cache-sym-link-repro and review the Zulip discussion about symlinks in the build cache. Reproduce the conflict with Next.js 16.1 and Rush, then determine the expected caching behavior before identifying a fix and regression coverage.

Written by the indexing model from the issue text.

Description

Summary

See original discussion here.

Repro steps

Repro here.

Expected result:

Actual result:

Details

Standard questions

Please answer these questions to help us investigate your issue more quickly:

Question	Answer
`@microsoft/rush` globally installed version?
`rushVersion` from rush.json?
`pnpmVersion`, `npmVersion`, or `yarnVersion` from rush.json?
(if pnpm) `useWorkspaces` from pnpm-config.json?
Operating system?
Would you consider contributing a PR?
Node.js version (`node -v`)?

Dominant language: TypeScript
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Merged PRs (30d): 62

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