Turbopack: refactor ESM codegen generation by mischnic · Pull Request #92777 · vercel/next.js

mischnic · 2026-04-14T12:09:26Z

Move more logic out of the ModuleReferencesVisitor, so that we can remove it at some point.

mischnic · 2026-04-14T12:09:42Z

Turbopack: refactor export analysis #92781 : 3 dependent PRs (#92823 , #92830 , #92834 )
Turbopack: refactor ESM codegen generation #92777 👈 (View in Graphite)
Turbopack: remove webpack chunk detection #92773
canary

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

codspeed-hq · 2026-04-14T12:28:44Z

Merging this PR will improve performance by 4.4%

⚡ 1 improved benchmark
✅ 7 untouched benchmarks
⏩ 12 skipped benchmarks¹

Performance Changes

	Mode	Benchmark	`BASE`	`HEAD`	Efficiency
⚡	Simulation	`packages-bundle.js[full]`	1,025.4 ms	982.2 ms	+4.4%

_{Comparing mischnic/refactor-esm-codegen (41c3115) with canary (ab4ec43)²}

12 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. ↩
No successful run was found on canary (7f3cfff) during the generation of this report, so ab4ec43 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

nextjs-bot · 2026-04-14T12:31:41Z

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)	455ms	455ms	✓	██▁▁▁
Cold (Ready in log)	453ms	456ms	✓	▁▁▁▂▂
Cold (First Request)	879ms	882ms	✓	▁▇▁▁▁
Warm (Listen)	455ms	456ms	✓	▅▅▅▅▅
Warm (Ready in log)	455ms	455ms	✓	▁▃▁▂▂
Warm (First Request)	368ms	362ms	✓	▁▂▁▂▂

📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric	Canary	PR	Change	Trend
Cold (Listen)	456ms	456ms	✓	▅█▅▁▅
Cold (Ready in log)	438ms	439ms	✓	▆▅█▆▂
Cold (First Request)	1.930s	1.925s	✓	▅▆██▂
Warm (Listen)	456ms	456ms	✓	▅▁█▅▅
Warm (Ready in log)	436ms	438ms	✓	▅▄█▄▂
Warm (First Request)	1.929s	1.941s	✓	▅▆█▅▁

⚡ Production Builds

Metric	Canary	PR	Change	Trend
Fresh Build	4.212s	4.224s	✓	▄▁▁▃▃
Cached Build	4.273s	4.289s	✓	▃▁▂▃▂

📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric	Canary	PR	Change	Trend
Fresh Build	14.467s	14.378s	✓	▃▄█▃▆
Cached Build	14.591s	14.544s	✓	▂▁█▂▁
node_modules Size	493 MB	493 MB	✓	▇▇▇▇▇

📦 Bundle Sizes

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📎 Tarball URL

https://vercel-packages.vercel.app/next/commits/90504c42f7c8a9b8adc0c00cd5b8d57a5029ea23/next

mischnic · 2026-04-15T09:44:13Z

Merge activity

Apr 15, 9:44 AM 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 14, 2026

mischnic mentioned this pull request Apr 14, 2026

Turbopack: remove webpack chunk detection #92773

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mischnic marked this pull request as ready for review April 14, 2026 13:40

mischnic requested a review from a team April 14, 2026 13:41

mischnic mentioned this pull request Apr 14, 2026

Turbopack: refactor export analysis #92781

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lukesandberg approved these changes Apr 14, 2026

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Comment thread turbopack/crates/turbopack-ecmascript/src/analyzer/graph.rs

mischnic force-pushed the mischnic/refactor-esm-codegen branch 2 times, most recently from 24026b7 to 90504c4 Compare April 15, 2026 08:37

mischnic force-pushed the mischnic/webpack-handling branch from c1078d2 to 8d134fd Compare April 15, 2026 08:37

mischnic changed the base branch from mischnic/webpack-handling to graphite-base/92777 April 15, 2026 09:11

Turbopack: refactor ESM codegen generation

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mischnic force-pushed the graphite-base/92777 branch from 8d134fd to 7f3cfff Compare April 15, 2026 09:11

mischnic force-pushed the mischnic/refactor-esm-codegen branch from 90504c4 to af22a46 Compare April 15, 2026 09:11

graphite-app Bot changed the base branch from graphite-base/92777 to canary April 15, 2026 09:12

cleanup

41c3115

mischnic force-pushed the mischnic/refactor-esm-codegen branch from af22a46 to 41c3115 Compare April 15, 2026 09:12

mischnic merged commit b6cf70e into canary Apr 15, 2026
185 of 189 checks passed

mischnic deleted the mischnic/refactor-esm-codegen branch April 15, 2026 09:44

This was referenced Apr 15, 2026

Turbopack: compute exports without full analysis #92823

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Turbopack: remove StarImportAnalyzer #92830

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Turbopack: analyzer improvement followups #92834

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Turbopack: move assignment_scopes computation into ImportMap #92835

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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: refactor ESM codegen generation#92777

Turbopack: refactor ESM codegen generation#92777
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