Turbopack hashed external aliases unresolved in Vercel prebuilt pnpm deployments

What this error means

Cannot find module 'require-in-the-middle-<hash>' — Failed to load external module require stack error in instrumentation hook during Vercel prebuilt deployment is a Vercel / Next.js failure pattern reported for developers trying to fix vercel deployment failure caused by turbopack hashed symlinks resolving incorrectly in pnpm monorepo prebuilt builds. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.

Why this happens

GitHub Issue #93901 in vercel/next.js (created 2026-05-17). Regression in Next.js 16.2.6 + Turbopack + pnpm causing instrumentation hooks to crash on Vercel prebuilt deployments. Symlink resolution works locally but fails in Vercel containerized environment. Category: Deployment — Vercel hosting platform build/deploy error.

Common causes

• GitHub Issue #93901 in vercel/next.js (created 2026-05-17). Regression in Next.js 16.2.6 + Turbopack + pnpm causing instrumentation hooks to crash on Vercel prebuilt deployments. Symlink resolution works locally but fails in Vercel containerized environment. Category: Deployment — Vercel hosting platform build/deploy error.

Quick fixes

1. Confirm the exact error signature matches Cannot find module 'require-in-the-middle-<hash>' — Failed to load external module require stack error in instrumentation hook during Vercel prebuilt deployment.
2. Check the Vercel / Next.js account, local tool state, and provider configuration involved in the failing workflow.
3. Check the build output, project root, and deployment platform configuration before redeploying.

Platform/tool-specific checks

• Verify the command, editor, extension, or API client that produced the error.
• Compare local settings with CI, deployment, or editor-level settings when the error appears in only one environment.
• Avoid deleting credentials, local model data, or project settings until the failing scope is clear.

Step-by-step troubleshooting

1. Capture the exact error message and the command, editor action, or request that triggered it.
2. Check whether the failure is account/auth, quota/rate, model/provider, local runtime, or deployment configuration.
3. Review the source evidence below and compare it with your environment.
4. Apply one change at a time and rerun the smallest failing action.
5. Keep the working fix documented for the team or deployment environment.

How to prevent it

• Keep provider/tool configuration documented.
• Record non-secret diagnostics such as tool version, provider name, model name, and command path.
• Add a lightweight check before CI or production workflows depend on the tool.

Sources checked

• https://github.com/vercel/next.js/issues/93901

Evidence note: GitHub Issue #93901 in vercel/next.js (created 2026-05-17). Regression in Next.js 16.2.6 + Turbopack + pnpm causing instrumentation hooks to crash on Vercel prebuilt deployments. Symlink resolution works locally but fails in Vercel containerized environment. Category: Deployment — Vercel hosting platform build/deploy error.

Related errors

• Deployment

FAQ

What should I check first?

Start with the exact Cannot find module 'require-in-the-middle-<hash>' — Failed to load external module require stack error in instrumentation hook during Vercel prebuilt deployment text and the smallest action that reproduces it.

Can I ignore this error?

No. Treat it as a failed Vercel / Next.js workflow until the root cause is understood.

Is this guaranteed to have one fix?

No. The imported evidence supports the troubleshooting path above, but tool behavior can vary by account, plan, version, provider, and local configuration.

How do I know the fix worked?

Rerun the same command, editor action, or request. The fix is working when that action completes without Cannot find module 'require-in-the-middle-<hash>' — Failed to load external module require stack error in instrumentation hook during Vercel prebuilt deployment.