Turbopack: analyzer improvement followups by mischnic · Pull Request #92834 · vercel/next.js

mischnic · 2026-04-15T16:20:07Z

defer computing the EsmAssetReference issue source from the Span. means that we have to pass less arguments around as well
make mangle("default export") a "constant" and use that everywhere instead

Some snapshots changed, because the test runner had source: None, so now there are some duplicate module references in there because the new always-set span field forces it to be a new entry in the data.references hashmap.

mischnic · 2026-04-15T16:20:32Z

Turbopack: analyzer improvement followups #92834 👈 (View in Graphite)
Turbopack: refactor export analysis #92781 : 1 other dependent PR (#92830 )
Turbopack: refactor ESM codegen generation #92777
Turbopack: remove webpack chunk detection #92773
canary

This stack of pull requests is managed by Graphite. Learn more about stacking.

codspeed-hq · 2026-04-15T16:45:22Z

Merging this PR will improve performance by 3.94%

⚡ 1 improved benchmark
✅ 16 untouched benchmarks
⏩ 3 skipped benchmarks¹

Performance Changes

	Mode	Benchmark	`BASE`	`HEAD`	Efficiency
⚡	Simulation	`app-page-turbo.runtime.prod.js[full]`	639.4 ms	615.2 ms	+3.94%

_{Comparing mischnic/refactor-export-analysis-followups (732bf49) with canary (92b0789)}

3 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

nextjs-bot · 2026-04-15T16:46:08Z

Tests Passed

nextjs-bot · 2026-04-15T17:00:31Z

Stats from current PR

✅ No significant changes detected

📊 All Metrics

📖 Metrics Glossary

Dev Server Metrics:

Listen = TCP port starts accepting connections
First Request = HTTP server returns successful response
Cold = Fresh build (no cache)
Warm = With cached build artifacts

Build Metrics:

Fresh = Clean build (no .next directory)
Cached = With existing .next directory

Change Thresholds:

Time: Changes < 50ms AND < 10%, OR < 2% are insignificant
Size: Changes < 1KB AND < 1% are insignificant
All other changes are flagged to catch regressions

⚡ Dev Server

Metric	Canary	PR	Change	Trend
Cold (Listen)	456ms	455ms	✓	█▁▁█▁
Cold (Ready in log)	442ms	440ms	✓	█▃█▁█
Cold (First Request)	1.100s	1.154s	✓	▁█▁█▁
Warm (Listen)	457ms	456ms	✓	▁▅▁▅▅
Warm (Ready in log)	445ms	442ms	✓	▃▃▅▅▄
Warm (First Request)	345ms	343ms	✓	▅▄█▄▇

📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric	Canary	PR	Change	Trend
Cold (Listen)	455ms	456ms	✓	▅▅▅▅▅
Cold (Ready in log)	438ms	437ms	✓	▃▂▂▃▂
Cold (First Request)	1.875s	1.861s	✓	▂▅▃▅▃
Warm (Listen)	455ms	457ms	✓	▅▅█▁▅
Warm (Ready in log)	437ms	437ms	✓	▃▂▂▃▁
Warm (First Request)	1.883s	1.875s	✓	▁▅▃▅▄

⚡ Production Builds

Metric	Canary	PR	Change	Trend
Fresh Build	3.927s	3.879s	✓	▃▁▅▃▅
Cached Build	3.939s	3.858s	✓	▃▁▅▁▅

📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric	Canary	PR	Change	Trend
Fresh Build	14.441s	14.429s	✓	▄▃▂▃▁
Cached Build	14.569s	14.571s	✓	▂▃▁▃▂
node_modules Size	493 MB	493 MB	✓	█████

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Total	465 kB	465 kB	⚠️ +39 B

Server

Middleware

	Canary	PR	Change
middleware-b..fest.js gzip	715 B	718 B	✓
Total	715 B	718 B	⚠️ +3 B

Build Details

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_buildManifest.js gzip	434 B	429 B	🟢 5 B (-1%)
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🔄 Shared (bundler-independent)

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app-route.ru..prod.js gzip	52.3 kB	52.3 kB	✓
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pages-api.ru...dev.js gzip	43.9 kB	43.9 kB	✓
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pages.runtim...dev.js gzip	53.3 kB	53.3 kB	✓
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📎 Tarball URL

https://vercel-packages.vercel.app/next/commits/732bf491af99aab80c369c67b5721cf6b8ae4e7a/next

mischnic · 2026-04-15T20:23:15Z

Merge activity

Apr 15, 8:23 PM UTC: @mischnic merged this pull request with Graphite.

nextjs-bot added created-by: Turbopack team PRs by the Turbopack team. Turbopack Related to Turbopack with Next.js. labels Apr 15, 2026

mischnic changed the title ~~ImportMapReference.span instead of issue_source~~ Turbopack: analyzer improvement followups Apr 15, 2026

mischnic requested a review from lukesandberg April 15, 2026 16:20

mischnic marked this pull request as ready for review April 15, 2026 16:21

mischnic changed the base branch from mischnic/refactor-export-analysis to graphite-base/92834 April 15, 2026 16:22

mischnic force-pushed the graphite-base/92834 branch from 3de5acb to de62a96 Compare April 15, 2026 16:24

mischnic force-pushed the mischnic/refactor-export-analysis-followups branch from 573dd75 to c4a4e1e Compare April 15, 2026 16:24

graphite-app Bot changed the base branch from graphite-base/92834 to canary April 15, 2026 16:24

mischnic force-pushed the mischnic/refactor-export-analysis-followups branch from c4a4e1e to 2bcff14 Compare April 15, 2026 16:24

mischnic mentioned this pull request Apr 15, 2026

Turbopack: move assignment_scopes computation into ImportMap #92835

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lukesandberg approved these changes Apr 15, 2026

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mischnic force-pushed the mischnic/refactor-export-analysis-followups branch 2 times, most recently from 32d4a77 to f7afe79 Compare April 15, 2026 18:43

mischnic added 3 commits April 15, 2026 20:52

ImportMapReference.span instead of issue_source

9e65508

MAGIC_IDENTIFIER_DEFAULT_EXPORT

fb9a5b6

update snapshots

732bf49

mischnic force-pushed the mischnic/refactor-export-analysis-followups branch from f7afe79 to 732bf49 Compare April 15, 2026 18:52

mischnic merged commit 69b9c4b into canary Apr 15, 2026
342 of 344 checks passed

mischnic deleted the mischnic/refactor-export-analysis-followups branch April 15, 2026 20:23

This was referenced Apr 23, 2026

fix(deps): vuln next (major → 16.2.4) [website] DataDog/vault#82

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fix(deps): vuln major upgrades — 4 packages (major: 1 · unstable: 1 · minor: 2) [src/frontend] DataDog/opentelemetry-demo#79

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Turbopack: analyzer improvement followups#92834

Turbopack: analyzer improvement followups#92834
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