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fix(build): select Nitro server entry from multiple chunks - #4668

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pi0 merged 4 commits into
nitrojs:mainfrom
tonoizer:fix/select-nitro-server-entry
Oct 3, 2026
Merged

pi0 merged 4 commits into
nitrojs:mainfrom
tonoizer:fix/select-nitro-server-entry

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@tonoizer

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Summary

  • Select Nitro's server chunk by matching the emitted entry's facadeModuleId to nitro.options.entry, instead of assuming the first entry chunk belongs to Nitro.
  • Preserve the previous first-entry fallback when the bundler does not expose a matching facade ID.
  • Add a fixture-backed regression test using real Rolldown output with an additional entry before Nitro's entry.

This is the Module Federation serverEntry issue from #4352. The Azure SWA portion of that PR was addressed by #4195; this build metadata issue remains on main.

Reproduction and verification

  • Repro: https://github.com/tonoizer/demo-nitro-vite-module-federation-serverEntry-bug
  • With the original selection logic, the fixture test fails: server/exposed.mjs is recorded instead of server/server.mjs.
  • With this patch, the repro built against a locally linked Nitro package records server/index.mjs instead of server/_chunks/app.mjs. vite preview serves both / and /api/hello with HTTP 200; the API returns {"api":"works!"}.

Testing

  • pnpm build — passed.
  • pnpm typecheck — passed.
  • Targeted Rolldown and Rollup runs (test/unit/build-info.test.ts and test/presets/node.test.ts) — 61 passed, 4 skipped, 1 todo in each run.
  • oxlint and oxfmt --check on all four changed files — passed.
  • Full vitest run on Windows — 74 test files passed; unrelated failures in Deno server startup and existing Windows path-sensitive Cloudflare/public-assets tests. Full pnpm lint also reports repo-wide formatting differences in this Windows checkout; changed files pass targeted lint and format checks.

Risk

When no entry facade matches, metadata selection keeps its prior first-entry behavior. The Module Federation repro emits the matching Nitro facade ID.

@tonoizer
tonoizer requested a review from pi0 as a code owner September 25, 2026 18:42
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@tonoizer is attempting to deploy a commit to the Nitro Team on Vercel.

A member of the Team first needs to authorize it.

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Reviewing files that changed from the base of the PR and between 91100e9 and 128cc54.

📒 Files selected for processing (4)
  • src/build/_extensions.ts
  • src/build/config.ts
  • src/build/info.ts
  • test/unit/build-info.test.ts
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📒 Files selected for processing (4)
  • src/build/config.ts
  • src/build/info.ts
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  • test/unit/build-info.test.ts
🚧 Files skipped from review as they are similar to previous changes (2)
  • test/unit/build-info.test.ts
  • src/build/info.ts

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📝 Walkthrough

Walkthrough

writeBuildInfo now selects the output chunk that matches Nitro’s configured entry when available. It resolves non-# entries using BUILD_EXTENSIONS and uses the configured path for # entries. If no chunk matches, it selects the first entry chunk.

Changes

Build entry selection

Layer / File(s) Summary
Resolve the configured server entry
src/build/info.ts, src/build/config.ts
writeBuildInfo resolves Nitro’s configured entry before matching output chunk facades. BUILD_EXTENSIONS is exported and copied when build configuration initializes its extensions. The resolver retains the first-entry fallback.
Verify entry selection
test/unit/build-info.test.ts, test/fixture/build-info/*
Tests cover entry order, customized output filenames, missing facade IDs, Rolldown output, and matching an extension-resolved TypeScript entry. They check that the returned entry path matches the saved serverEntry.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix

Merge Risk: ⚪ Minimal · up to 91100

The change selects Nitro’s configured entry when its facade is available and retains the existing fallback otherwise. The described regression tests cover competing entries, and no concrete merge-blocking risk remains.

Security Architecture Review

Security architecture risk: 🔵 Low · up to 91100

The new selection uses the configured server entry rather than output order, while retaining the previous fallback. The reviewed change does not establish a new exposed endpoint or attack path, but the full downstream use of the metadata has not been verified.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

  • inferred — The demonstrated effect is on generated server-entry metadata for builds with multiple entry chunks. The reviewed evidence does not establish expanded network reachability or a production caller of the fixture export.

Trust Boundaries and Controls

  • observed — The selection is based on configured entry and bundler facade paths, accepts only entry chunks for a match, and retains the prior first-entry fallback. The evidence does not establish that an external attacker controls either input.

Resilience and Maintainability Implications

  • observed — The writer still saves nitro.json before last-build.json; the change alters the computed serverEntry, not the existing write sequence or fallback behavior.
🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name Status Explanation Resolution
Docstring Coverage ⚠️ Warning Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 7 functions across 6 files. Write docstrings for the functions missing them to satisfy the coverage threshold.
✅ Passed checks (4 passed)
Check name Status Explanation
Title check ✅ Passed The title follows Conventional Commits with the valid fix(build): prefix and accurately describes the Nitro server entry selection fix.
Description check ✅ Passed The description directly explains the server-entry selection change, fallback behavior, regression tests, verification results, and known unrelated failures.
Linked Issues check ✅ Passed Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check ✅ Passed Check skipped because no linked issues were found for this pull request.
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Actionable comments posted: 1


  • 🪄 Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.

Inline comments:
In `@src/build/info.ts`:
- Line 142: Update the facade matching in writeBuildInfo to compare against
Nitro’s bundler-resolved input ID instead of accepting any facade with the same
path stem. Add a regression case with both server.ts and server.js, verifying
that serverEntry points to the resolved server.ts entry.

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📒 Files selected for processing (4)
  • src/build/info.ts
  • test/fixture/build-info/exposed.ts
  • test/fixture/build-info/server.ts
  • test/unit/build-info.test.ts

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Comment thread src/build/info.ts Outdated
tonoizer and others added 2 commits September 25, 2026 21:29
- match facade ids by resolved path only, drop stem fallback
- warn when no output chunk matches the nitro entry
- move BUILD_EXTENSIONS to a standalone module to keep info.ts light
- generate unit test fixtures in a temp dir
…tro-server-entry

# Conflicts:
#	src/build/config.ts
@pi0
pi0 merged commit 136fb29 into nitrojs:main Oct 3, 2026
9 of 10 checks passed
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2 participants