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Merged
sokra merged 1 commit into from
Jan 16, 2026
Merged

Turbopack: use selective reads for merged modules #88560

sokra merged 1 commit into from
Jan 16, 2026
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@sokra sokra commented Jan 14, 2026 •
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What?

Use selective reads for merged modules data.

This is a preparation to make chunking be less dependent on module graph changes.

@nextjs-bot nextjs-bot added created-by: Turbopack team PRs by the Turbopack team. Turbopack Related to Turbopack with Next.js. labels Jan 14, 2026
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sokra commented Jan 14, 2026 •
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nextjs-bot commented Jan 14, 2026 •
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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) 440ms 440ms ✓ ▂▂█▂▂
Cold (First Request) 1.227s 1.197s ✓ ▄▄█▄▄
Warm (Listen) 456ms 457ms ✓ ▁▁█▁▁
Warm (Ready in log) 443ms 444ms ✓ ▁▁█▁▁
Warm (First Request) 343ms 341ms ✓ ▁▁█▂▁
📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric Canary PR Change Trend
Cold (Listen) 455ms 455ms ✓ ▅▁█▁▁
Cold (Ready in log) 437ms 437ms ✓ █▇▁▇█
Cold (First Request) 1.797s 1.796s ✓ ██▂▇▇
Warm (Listen) 456ms 455ms ✓ ▅█▅▁▅
Warm (Ready in log) 436ms 436ms ✓ ▇▇▁▇█
Warm (First Request) 1.815s 1.817s ✓ ██▁▇█

⚡ Production Builds

Metric Canary PR Change Trend
Fresh Build 4.353s 4.361s ✓ ▁▁█▁▁
Cached Build 4.243s 4.343s ✓ ▁▁█▁▁
📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric Canary PR Change Trend
Fresh Build 13.859s 13.866s ✓ ▇▅█▁▃
Cached Build 13.983s 13.983s ✓ ███▂▃
node_modules Size 458 MB 458 MB ✓ ▁▁▁██
📦 Bundle Sizes

Bundle Sizes

⚡ Turbopack

Client

Main Bundles: **430 kB** → **430 kB** ✅ -81 B

82 files with content-based hashes (individual files not comparable between builds)

Server

Middleware
Canary PR Change
middleware-b..fest.js gzip 790 B 785 B ✓
Total 790 B 785 B ✅ -5 B
Build Details
Build Manifests
Canary PR Change
_buildManifest.js gzip 449 B 450 B ✓
Total 449 B 450 B ⚠️ +1 B

📦 Webpack

Client

Main Bundles
Canary PR Change
2086.HASH.js gzip 169 B N/A -
2161-HASH.js gzip 5.41 kB N/A -
2747-HASH.js gzip 4.48 kB N/A -
4322-HASH.js gzip 52.3 kB N/A -
ec793fe8-HASH.js gzip 62.3 kB N/A -
framework-HASH.js gzip 59.8 kB 59.8 kB ✓
main-app-HASH.js gzip 251 B 253 B ✓
main-HASH.js gzip 38.6 kB 38.9 kB ✓
webpack-HASH.js gzip 1.68 kB 1.68 kB ✓
1596.HASH.js gzip N/A 169 B -
2658-HASH.js gzip N/A 51.9 kB -
6349-HASH.js gzip N/A 4.46 kB -
7019-HASH.js gzip N/A 5.43 kB -
b17a3386-HASH.js gzip N/A 62.3 kB -
Total 225 kB 225 kB ✅ -11 B
Polyfills
Canary PR Change
polyfills-HASH.js gzip 39.4 kB 39.4 kB ✓
Total 39.4 kB 39.4 kB ✓
Pages
Canary PR Change
_app-HASH.js gzip 194 B 193 B ✓
_error-HASH.js gzip 182 B 182 B ✓
css-HASH.js gzip 336 B 335 B ✓
dynamic-HASH.js gzip 1.8 kB 1.8 kB ✓
edge-ssr-HASH.js gzip 256 B 256 B ✓
head-HASH.js gzip 352 B 349 B ✓
hooks-HASH.js gzip 385 B 384 B ✓
image-HASH.js gzip 580 B 580 B ✓
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link-HASH.js gzip 2.5 kB 2.51 kB ✓
routerDirect..HASH.js gzip 319 B 317 B ✓
script-HASH.js gzip 385 B 387 B ✓
withRouter-HASH.js gzip 316 B 315 B ✓
1afbb74e6ecf..834.css gzip 106 B 106 B ✓
Total 7.97 kB 7.96 kB ✅ -8 B

Server

Edge SSR
Canary PR Change
edge-ssr.js gzip 125 kB 125 kB ✓
page.js gzip 242 kB 237 kB 🟢 4.85 kB (-2%)
Total 366 kB 362 kB ✅ -4.84 kB
Middleware
Canary PR Change
middleware-b..fest.js gzip 654 B 652 B ✓
middleware-r..fest.js gzip 155 B 156 B ✓
middleware.js gzip 33 kB 33.3 kB 🔴 +333 B (+1%)
edge-runtime..pack.js gzip 842 B 842 B ✓
Total 34.6 kB 35 kB ⚠️ +332 B
Build Details
Build Manifests
Canary PR Change
_buildManifest.js gzip 738 B 738 B ✓
Total 738 B 738 B ✓
Build Cache
Canary PR Change
0.pack gzip 3.66 MB 3.67 MB 🔴 +7.78 kB (+0%)
index.pack gzip 101 kB 98.7 kB 🟢 2.6 kB (-3%)
index.pack.old gzip 99.4 kB 97.9 kB 🟢 1.43 kB (-1%)
Total 3.86 MB 3.86 MB ⚠️ +3.75 kB

🔄 Shared (bundler-independent)

Runtimes
Canary PR Change
app-page-exp...dev.js gzip 304 kB 304 kB ✓
app-page-exp..prod.js gzip 158 kB 158 kB ✓
app-page-tur...dev.js gzip 304 kB 304 kB ✓
app-page-tur..prod.js gzip 158 kB 158 kB ✓
app-page-tur...dev.js gzip 300 kB 300 kB ✓
app-page-tur..prod.js gzip 156 kB 156 kB ✓
app-page.run...dev.js gzip 300 kB 300 kB ✓
app-page.run..prod.js gzip 156 kB 156 kB ✓
app-route-ex...dev.js gzip 68.8 kB 68.8 kB ✓
app-route-ex..prod.js gzip 47.6 kB 47.6 kB ✓
app-route-tu...dev.js gzip 68.8 kB 68.8 kB ✓
app-route-tu..prod.js gzip 47.6 kB 47.6 kB ✓
app-route-tu...dev.js gzip 68.4 kB 68.4 kB ✓
app-route-tu..prod.js gzip 47.4 kB 47.4 kB ✓
app-route.ru...dev.js gzip 68.4 kB 68.4 kB ✓
app-route.ru..prod.js gzip 47.3 kB 47.3 kB ✓
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dist_client_...dev.js gzip 318 B 318 B ✓
dist_client_...dev.js gzip 317 B 317 B ✓
pages-api-tu...dev.js gzip 41.2 kB 41.2 kB ✓
pages-api-tu..prod.js gzip 31.3 kB 31.3 kB ✓
pages-api.ru...dev.js gzip 41.1 kB 41.1 kB ✓
pages-api.ru..prod.js gzip 31.2 kB 31.2 kB ✓
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pages.runtim...dev.js gzip 50.7 kB 50.7 kB ✓
pages.runtim..prod.js gzip 38.2 kB 38.2 kB ✓
server.runti..prod.js gzip 62.2 kB 62.2 kB ✓
Total 2.69 MB 2.69 MB ⚠️ +3 B

@sokra sokra marked this pull request as ready for review January 15, 2026 07:45
@sokra sokra requested a review from mischnic January 15, 2026 07:59
@sokra sokra force-pushed the sokra/merged-modules-selective branch from 01acfb1 to 4b38276 Compare January 15, 2026 07:59
@sokra sokra force-pushed the sokra/chunk-group-info-selective branch from 123468b to 57f3026 Compare January 15, 2026 07:59
@sokra sokra force-pushed the sokra/merged-modules-selective branch from 4b38276 to f655453 Compare January 15, 2026 10:51
@sokra sokra force-pushed the sokra/chunk-group-info-selective branch from 57f3026 to 7ea2ab2 Compare January 15, 2026 10:51
@sokra sokra force-pushed the sokra/merged-modules-selective branch from f655453 to 5d26752 Compare January 15, 2026 10:55
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codspeed-hq bot commented Jan 15, 2026 •
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CodSpeed Performance Report

Merging this PR will not alter performance

Comparing sokra/merged-modules-selective (270b86a) with canary (bbf8aec)

Summary

✅ 17 untouched benchmarks
⏩ 3 skipped benchmarks1

Footnotes

  1. 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. ↩

@sokra sokra force-pushed the sokra/chunk-group-info-selective branch from ac32f08 to 4984f09 Compare January 15, 2026 18:37
@sokra sokra force-pushed the sokra/merged-modules-selective branch from 5d26752 to 6a2c423 Compare January 15, 2026 18:37
@sokra sokra force-pushed the sokra/chunk-group-info-selective branch from 4984f09 to c7a40b1 Compare January 15, 2026 19:23
@sokra sokra force-pushed the sokra/merged-modules-selective branch from 6a2c423 to 417f80f Compare January 15, 2026 19:23
@sokra sokra force-pushed the sokra/chunk-group-info-selective branch 2 times, most recently from 7b4c945 to 0b1cd77 Compare January 16, 2026 05:48
@sokra sokra force-pushed the sokra/merged-modules-selective branch 3 times, most recently from 733a56f to 79c0c1e Compare January 16, 2026 08:38
@sokra sokra force-pushed the sokra/chunk-group-info-selective branch 2 times, most recently from 6b38c6e to d870869 Compare January 16, 2026 09:02
@sokra sokra force-pushed the sokra/merged-modules-selective branch from 79c0c1e to aa766fa Compare January 16, 2026 09:03
@sokra sokra force-pushed the sokra/chunk-group-info-selective branch from d870869 to 0874e3f Compare January 16, 2026 09:44
@sokra sokra force-pushed the sokra/merged-modules-selective branch from aa766fa to 95d32c3 Compare January 16, 2026 09:44
@sokra sokra force-pushed the sokra/chunk-group-info-selective branch from 0874e3f to 3731bb9 Compare January 16, 2026 12:08
@sokra sokra force-pushed the sokra/merged-modules-selective branch from 95d32c3 to 2ea978f Compare January 16, 2026 12:09
@sokra sokra changed the base branch from sokra/chunk-group-info-selective to graphite-base/88560 January 16, 2026 12:27
@sokra sokra force-pushed the graphite-base/88560 branch from 3731bb9 to bcb4795 Compare January 16, 2026 12:28
@sokra sokra force-pushed the sokra/merged-modules-selective branch from 2ea978f to e36980f Compare January 16, 2026 12:28
@sokra sokra changed the base branch from graphite-base/88560 to sokra/chunk-group-info-selective January 16, 2026 12:28
@sokra sokra force-pushed the sokra/chunk-group-info-selective branch 2 times, most recently from a890206 to 866cdb7 Compare January 16, 2026 13:18
@sokra sokra force-pushed the sokra/merged-modules-selective branch from e36980f to f693acb Compare January 16, 2026 13:18
@sokra sokra changed the base branch from sokra/chunk-group-info-selective to graphite-base/88560 January 16, 2026 14:33
@sokra sokra force-pushed the sokra/merged-modules-selective branch from f693acb to 5371a4a Compare January 16, 2026 14:34
@sokra sokra force-pushed the graphite-base/88560 branch from 866cdb7 to bbf8aec Compare January 16, 2026 14:34
@graphite-app graphite-app bot changed the base branch from graphite-base/88560 to canary January 16, 2026 14:34
@sokra sokra force-pushed the sokra/merged-modules-selective branch from 5371a4a to 270b86a Compare January 16, 2026 14:34
@sokra sokra merged commit a8b0f9d into canary Jan 16, 2026
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sokra commented Jan 16, 2026

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@sokra sokra deleted the sokra/merged-modules-selective branch January 16, 2026 15:05
wyattjoh pushed a commit that referenced this pull request Jan 16, 2026
@sokra @wyattjoh
Turbopack: use selective reads for merged modules (#88560)
601b78c 
### What?

Use selective reads for merged modules data.

This is a preparation to make chunking be less dependent on module graph changes.
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