Turbopack: use ChunkGroupEntry::Shared, part 2 by mischnic · Pull Request #91279 · vercel/next.js

mischnic · 2026-03-12T20:09:31Z

Followup to #90978, which fixed the ChunkGroups passed to .chunk_group(), forgot to update the the module graph entry types, which didn't match up.

The ChunkGroupEntry::Shared(ResolvedVc::upcast(*server_component)) one was more involved:

We used to have layout.js [app-rsc] (Next.js Server Component) --ChunkingType::Shared--> layout.js [app-rsc] (the actual module)
But this meant that the actual chunk group was Shared(server_component.await?.module) (the inner one)
This wasn't possible to use for the module graph construction though, as the client reference transform needs to see the layout.js [app-rsc] (Next.js Server Component) module during the traversal, to infer the parent server component of the given subgraph.

So instead, move to

loader-tree in the template
--ChunkingType::Shared-->
layout.js [app-rsc] (Next.js Server Component)
--ChunkingType::Parallel-->
layout.js [app-rsc]

The reason for that ChunkingType::Shared is so that we can chunk arbitrary modules that are loaded by ChunkGroup::Entry. Meaning that we can do chunk_group(Shared(root_layout))).concat(chunk_group(Shared(layout))).concat(chunk_group(Entry(page))) and rely on turbotask caching to deduplicate layout chunking across pages.

mischnic · 2026-03-12T20:09:44Z

Turbopack: reimplement server actions using emit/collect #91212
Turbopack: emit/collect #91100
Turbopack: use ChunkGroupEntry::Shared, part 2 #91279 👈 (View in Graphite)
Turbopack: require(/* turbopackChunkingType: parallel */ #91278 : 1 other dependent PR (#91317 )
[turbopack] Remove turbo_tasks::function from ModuleReference getters #91229
canary

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

codspeed-hq · 2026-03-12T20:25:17Z

Merging this PR will not alter performance

✅ 17 untouched benchmarks
⏩ 3 skipped benchmarks¹

_{Comparing mischnic/layout-segment-chunkgroupentry-shared (a2bb760) with canary (4a99afc)}

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 · 2026-03-12T20:41:59Z

Tests Passed

nextjs-bot · 2026-03-12T20:46:29Z

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	456ms	✓	▆█▁▁▁
Cold (Ready in log)	440ms	440ms	✓	▄█▁▁▁
Cold (First Request)	1.144s	1.125s	✓	▄█▁▁▁
Warm (Listen)	457ms	457ms	✓	▆█▁▁▁
Warm (Ready in log)	443ms	443ms	✓	▄█▁▁▁
Warm (First Request)	345ms	346ms	✓	▃█▁▁▁

📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric	Canary	PR	Change	Trend
Cold (Listen)	507ms	508ms	✓	▁▁▁▁▁
Cold (Ready in log)	465ms	467ms	✓	▁▃▄▁▃
Cold (First Request)	2.144s	2.109s	✓	▁▂▂▁▂
Warm (Listen)	508ms	508ms	✓	▁▁▁▁▁
Warm (Ready in log)	466ms	466ms	✓	▁▃▄▁▄
Warm (First Request)	2.135s	2.134s	✓	▁▂▂▁▂

⚡ Production Builds

Metric	Canary	PR	Change	Trend
Fresh Build	3.804s	3.731s	✓	▅█▁▁▁
Cached Build	3.787s	3.728s	✓	▅█▂▁▁

📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric	Canary	PR	Change	Trend
Fresh Build	15.974s	15.927s	✓	▁▁▁▁▁
Cached Build	16.091s	16.042s	✓	▁▁▁▁▁
node_modules Size	483 MB	483 MB	✓	▁████

📦 Bundle Sizes

Bundle Sizes

⚡ Turbopack

Client

Main Bundles

	Canary	PR	Change
0-m3lxn9ivp_d.js gzip	162 B	N/A	-
0.-r71sd1j_zb.js gzip	7.61 kB	N/A	-
0~-plqowrxaiq.js gzip	170 B	N/A	-
0~lwfcrlb4v_9.css gzip	115 B	115 B	✓
00h0nz7r436~l.js gzip	13.3 kB	N/A	-
029_0n_61aap-.js gzip	70.8 kB	N/A	-
02ku7edzc_wf7.js gzip	450 B	N/A	-
03~yq9q893hmn.js gzip	39.4 kB	39.4 kB	✓
092lcb3fqrrf9.js gzip	8.52 kB	N/A	-
0ac.phskjau0b.js gzip	158 B	N/A	-
0aj~xs1l1g8tg.js gzip	8.53 kB	N/A	-
0g0avicw0a5.l.js gzip	156 B	N/A	-
0gcm6h40wgorw.js gzip	48.2 kB	N/A	-
0h~_p6c6krw3f.js gzip	155 B	N/A	-
0h35gmp9u328z.js gzip	8.54 kB	N/A	-
0h6fkavebp.iz.js gzip	8.47 kB	N/A	-
0ino_yf1k3h6k.js gzip	10.4 kB	N/A	-
0k.sixc712dq1.js gzip	10.1 kB	N/A	-
0kkm7tesfinr6.js gzip	12.9 kB	N/A	-
0l4bu6-iylytu.js gzip	156 B	N/A	-
0moy~uao4dl.m.js gzip	9.19 kB	N/A	-
0oxfh9vf9xol0.js gzip	156 B	N/A	-
0q50rtpusjy90.js gzip	2.28 kB	N/A	-
0smgy2grrrlka.js gzip	8.58 kB	N/A	-
0t1dzhdfh0txh.js gzip	215 B	215 B	✓
0u2bvb3fwjc.j.js gzip	155 B	N/A	-
0vwpsns7_n8j5.js gzip	13.6 kB	N/A	-
0yedy2nlxl.ia.js gzip	162 B	N/A	-
0zid7o0-vupvp.js gzip	225 B	N/A	-
10p-bsrowjca0.js gzip	158 B	N/A	-
11s6x9pcj4vxt.js gzip	157 B	N/A	-
11yo3xfd6b147.js gzip	12.9 kB	N/A	-
13.84hqxl_1p7.js gzip	9.76 kB	N/A	-
14v2a7u4xu22z.js gzip	157 B	N/A	-
1554wr-t7p6z-.js gzip	8.55 kB	N/A	-
15s.go9_6chuz.js gzip	65.7 kB	N/A	-
15tjst79~qy3_.js gzip	1.46 kB	N/A	-
15z_v00ne4ud0.js gzip	8.47 kB	N/A	-
17d_m3p4j9w6r.js gzip	5.62 kB	N/A	-
17yu~3yiu7d2m.js gzip	8.52 kB	N/A	-
188gain_2u3k9.js gzip	157 B	N/A	-
turbopack-0...b8_0.js gzip	4.16 kB	N/A	-
turbopack-03..u6-n.js gzip	4.16 kB	N/A	-
turbopack-06...odu.js gzip	4.14 kB	N/A	-
turbopack-09..jw41.js gzip	4.16 kB	N/A	-
turbopack-09..i1z9.js gzip	4.16 kB	N/A	-
turbopack-0m..vxy3.js gzip	4.16 kB	N/A	-
turbopack-0m..~hqc.js gzip	4.15 kB	N/A	-
turbopack-0o..8~3x.js gzip	4.16 kB	N/A	-
turbopack-0q..mhg_.js gzip	4.16 kB	N/A	-
turbopack-0s..gliq.js gzip	4.16 kB	N/A	-
turbopack-0u..k9zu.js gzip	4.16 kB	N/A	-
turbopack-10..8sax.js gzip	4.15 kB	N/A	-
turbopack-11..4bv0.js gzip	4.16 kB	N/A	-
turbopack-15..tsj9.js gzip	4.17 kB	N/A	-
01umcdex4f~m9.js gzip	N/A	13.6 kB	-
02gzbp8wsyfo-.js gzip	N/A	70.8 kB	-
03t__~.5lvgeu.js gzip	N/A	5.62 kB	-
04d6ll75jqx3r.js gzip	N/A	9.19 kB	-
04yegd4pwdu3f.js gzip	N/A	152 B	-
05.z3nadwcjhm.js gzip	N/A	155 B	-
0508ye.nu_ii2.js gzip	N/A	157 B	-
05673jb9k5ren.js gzip	N/A	157 B	-
0583exyh-yhc7.js gzip	N/A	9.76 kB	-
05b07nana~4_..js gzip	N/A	10.1 kB	-
072lv63r8dcz~.js gzip	N/A	8.58 kB	-
076vw6tg50945.js gzip	N/A	153 B	-
08refq~-egobr.js gzip	N/A	156 B	-
09j2nyjh-gde8.js gzip	N/A	158 B	-
0ar1~bwpezfgw.js gzip	N/A	13.3 kB	-
0c3leaugxcvgb.js gzip	N/A	155 B	-
0c99mq1ez2bke.js gzip	N/A	450 B	-
0cq-cmde_ws6u.js gzip	N/A	8.47 kB	-
0fwf102w10o9~.js gzip	N/A	8.52 kB	-
0gtmn.q_j1v5r.js gzip	N/A	10.4 kB	-
0l4d~z7ixj3wz.js gzip	N/A	12.9 kB	-
0n7bzm036.uw3.js gzip	N/A	160 B	-
0nclq9z6yzzm5.js gzip	N/A	1.46 kB	-
0nvnmuxpdyn-t.js gzip	N/A	65.7 kB	-
0nzumcogektg7.js gzip	N/A	8.55 kB	-
0s.c-cn5eebrx.js gzip	N/A	8.47 kB	-
0s5ej0rhsf.3a.js gzip	N/A	169 B	-
0tna7lg6q4zne.js gzip	N/A	12.9 kB	-
0votdfxr5fb5u.js gzip	N/A	2.28 kB	-
0xkuhv202qqhu.js gzip	N/A	7.6 kB	-
0y~srtt-b14d..js gzip	N/A	155 B	-
0ykl9bs_qj.5..js gzip	N/A	8.52 kB	-
0zfen0tnxp4gh.js gzip	N/A	8.55 kB	-
10wkq1h9jzkg..js gzip	N/A	225 B	-
13ncdn~mslimg.js gzip	N/A	162 B	-
149ndfh8zfcaz.js gzip	N/A	8.53 kB	-
14baw4rjxv_ds.js gzip	N/A	48.1 kB	-
14ix9emhgsyxn.js gzip	N/A	154 B	-
turbopack-0_..zz7r.js gzip	N/A	4.16 kB	-
turbopack-0...0dw_.js gzip	N/A	4.16 kB	-
turbopack-0~..tg3z.js gzip	N/A	4.16 kB	-
turbopack-0~..azp4.js gzip	N/A	4.16 kB	-
turbopack-0c..2hn8.js gzip	N/A	4.16 kB	-
turbopack-0h..-gyh.js gzip	N/A	4.16 kB	-
turbopack-0i..np7y.js gzip	N/A	4.14 kB	-
turbopack-0p..~xt1.js gzip	N/A	4.16 kB	-
turbopack-0r..lj0f.js gzip	N/A	4.16 kB	-
turbopack-0v..mnsx.js gzip	N/A	4.16 kB	-
turbopack-0y..jxh8.js gzip	N/A	4.16 kB	-
turbopack-10..yp1k.js gzip	N/A	4.16 kB	-
turbopack-11..47ja.js gzip	N/A	4.17 kB	-
turbopack-16..~v78.js gzip	N/A	4.16 kB	-
Total	463 kB	462 kB	✅ -15 B

Server

Middleware

	Canary	PR	Change
middleware-b..fest.js gzip	712 B	716 B	✓
Total	712 B	716 B	⚠️ +4 B

Build Details

Build Manifests

	Canary	PR	Change
_buildManifest.js gzip	426 B	429 B	✓
Total	426 B	429 B	⚠️ +3 B

📦 Webpack

Client

Main Bundles

	Canary	PR	Change
5528-HASH.js gzip	5.54 kB	N/A	-
6280-HASH.js gzip	60.1 kB	N/A	-
6335.HASH.js gzip	169 B	N/A	-
912-HASH.js gzip	4.59 kB	N/A	-
e8aec2e4-HASH.js gzip	62.7 kB	N/A	-
framework-HASH.js gzip	59.7 kB	59.7 kB	✓
main-app-HASH.js gzip	256 B	254 B	✓
main-HASH.js gzip	39.2 kB	39.2 kB	✓
webpack-HASH.js gzip	1.68 kB	1.68 kB	✓
262-HASH.js gzip	N/A	4.59 kB	-
2889.HASH.js gzip	N/A	169 B	-
5602-HASH.js gzip	N/A	5.55 kB	-
6948ada0-HASH.js gzip	N/A	62.7 kB	-
9544-HASH.js gzip	N/A	60.8 kB	-
Total	234 kB	235 kB	⚠️ +689 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	194 B	✓
_error-HASH.js gzip	183 B	180 B	🟢 3 B (-2%)
css-HASH.js gzip	331 B	330 B	✓
dynamic-HASH.js gzip	1.81 kB	1.81 kB	✓
edge-ssr-HASH.js gzip	256 B	256 B	✓
head-HASH.js gzip	351 B	352 B	✓
hooks-HASH.js gzip	384 B	383 B	✓
image-HASH.js gzip	580 B	581 B	✓
index-HASH.js gzip	260 B	260 B	✓
link-HASH.js gzip	2.51 kB	2.51 kB	✓
routerDirect..HASH.js gzip	320 B	319 B	✓
script-HASH.js gzip	386 B	386 B	✓
withRouter-HASH.js gzip	315 B	315 B	✓
1afbb74e6ecf..834.css gzip	106 B	106 B	✓
Total	7.98 kB	7.98 kB	✅ -1 B

Server

Edge SSR

	Canary	PR	Change
edge-ssr.js gzip	125 kB	125 kB	✓
page.js gzip	268 kB	267 kB	✓
Total	393 kB	392 kB	✅ -339 B

Middleware

	Canary	PR	Change
middleware-b..fest.js gzip	616 B	612 B	✓
middleware-r..fest.js gzip	156 B	155 B	✓
middleware.js gzip	43.8 kB	43.7 kB	✓
edge-runtime..pack.js gzip	842 B	842 B	✓
Total	45.5 kB	45.3 kB	✅ -145 B

Build Details

Build Manifests

	Canary	PR	Change
_buildManifest.js gzip	715 B	718 B	✓
Total	715 B	718 B	⚠️ +3 B

Build Cache

	Canary	PR	Change
0.pack gzip	4.26 MB	4.25 MB	✓
index.pack gzip	109 kB	108 kB	✓
index.pack.old gzip	108 kB	108 kB	✓
Total	4.47 MB	4.47 MB	✅ -3.68 kB

🔄 Shared (bundler-independent)

Runtimes

	Canary	PR	Change
app-page-exp...dev.js gzip	332 kB	332 kB	✓
app-page-exp..prod.js gzip	180 kB	180 kB	✓
app-page-tur...dev.js gzip	332 kB	332 kB	✓
app-page-tur..prod.js gzip	180 kB	180 kB	✓
app-page-tur...dev.js gzip	328 kB	328 kB	✓
app-page-tur..prod.js gzip	178 kB	178 kB	✓
app-page.run...dev.js gzip	329 kB	329 kB	✓
app-page.run..prod.js gzip	179 kB	179 kB	✓
app-route-ex...dev.js gzip	76 kB	76 kB	✓
app-route-ex..prod.js gzip	51.7 kB	51.7 kB	✓
app-route-tu...dev.js gzip	76 kB	76 kB	✓
app-route-tu..prod.js gzip	51.7 kB	51.7 kB	✓
app-route-tu...dev.js gzip	75.6 kB	75.6 kB	✓
app-route-tu..prod.js gzip	51.5 kB	51.5 kB	✓
app-route.ru...dev.js gzip	75.5 kB	75.5 kB	✓
app-route.ru..prod.js gzip	51.4 kB	51.4 kB	✓
dist_client_...dev.js gzip	324 B	324 B	✓
dist_client_...dev.js gzip	326 B	326 B	✓
dist_client_...dev.js gzip	318 B	318 B	✓
dist_client_...dev.js gzip	317 B	317 B	✓
pages-api-tu...dev.js gzip	43.3 kB	43.3 kB	✓
pages-api-tu..prod.js gzip	33 kB	33 kB	✓
pages-api.ru...dev.js gzip	43.3 kB	43.3 kB	✓
pages-api.ru..prod.js gzip	33 kB	33 kB	✓
pages-turbo....dev.js gzip	52.7 kB	52.7 kB	✓
pages-turbo...prod.js gzip	38.6 kB	38.6 kB	✓
pages.runtim...dev.js gzip	52.7 kB	52.7 kB	✓
pages.runtim..prod.js gzip	38.6 kB	38.6 kB	✓
server.runti..prod.js gzip	62.4 kB	62.4 kB	✓
Total	2.95 MB	2.95 MB	✅ -1 B

📎 Tarball URL

https://vercel-packages.vercel.app/next/commits/a2bb760159b4e10a1b506463ce89e13bc2bf91ce/next

nextjs-bot added created-by: Turbopack team PRs by the Turbopack team. Turbopack Related to Turbopack with Next.js. labels Mar 12, 2026

mischnic mentioned this pull request Mar 12, 2026

Turbopack: require(/* turbopackChunkingType: parallel */ #91278

Merged

mischnic changed the title ~~Turbopack: use ChunkGroup::Shared, part 2~~ Turbopack: use ChunkGroupEntry::Shared, part 2 Mar 12, 2026

mischnic marked this pull request as ready for review March 12, 2026 20:11

mischnic requested a review from a team March 12, 2026 20:13

mischnic force-pushed the mischnic/layout-segment-chunkgroupentry-shared branch from 42d13ec to c06fa83 Compare March 12, 2026 20:24

mischnic force-pushed the mischnic/require-turbopackChunkingType branch from bc9cf2c to 5ce35de Compare March 12, 2026 20:24

This was referenced Mar 12, 2026

Turbopack: emit/collect #91100

Draft

Turbopack: reimplement server actions using emit/collect #91212

Draft

mischnic changed the base branch from mischnic/require-turbopackChunkingType to graphite-base/91279 March 13, 2026 14:18

mischnic mentioned this pull request Mar 13, 2026

Turbopack: use camel case for import attributes #91317

Open

mischnic force-pushed the graphite-base/91279 branch from 5ce35de to f617334 Compare March 13, 2026 15:06

mischnic force-pushed the mischnic/layout-segment-chunkgroupentry-shared branch from c06fa83 to cf4dc27 Compare March 13, 2026 15:06

mischnic changed the base branch from graphite-base/91279 to mischnic/require-turbopackChunkingType March 13, 2026 15:06

mischnic force-pushed the mischnic/require-turbopackChunkingType branch from f617334 to 7a620f4 Compare March 13, 2026 15:40

mischnic force-pushed the mischnic/layout-segment-chunkgroupentry-shared branch 2 times, most recently from 372fe44 to f7c4fb3 Compare March 13, 2026 18:19

mischnic force-pushed the mischnic/require-turbopackChunkingType branch from 7a620f4 to a9d5f25 Compare March 13, 2026 18:19

mischnic mentioned this pull request Mar 13, 2026

[turbopack] Remove turbo_tasks::function from ModuleReference getters #91229

Merged

lukesandberg force-pushed the mischnic/require-turbopackChunkingType branch 2 times, most recently from e63dd0a to de4534b Compare March 13, 2026 18:56

lukesandberg force-pushed the mischnic/layout-segment-chunkgroupentry-shared branch from f7c4fb3 to 2596d96 Compare March 13, 2026 18:56

mischnic force-pushed the mischnic/require-turbopackChunkingType branch from de4534b to f1eb8a9 Compare March 14, 2026 10:52

mischnic force-pushed the mischnic/layout-segment-chunkgroupentry-shared branch from 2596d96 to 3c2709e Compare March 14, 2026 10:52

mischnic changed the base branch from mischnic/require-turbopackChunkingType to graphite-base/91279 March 14, 2026 12:05

mischnic force-pushed the mischnic/layout-segment-chunkgroupentry-shared branch from 3c2709e to d27300e Compare March 14, 2026 12:06

mischnic force-pushed the graphite-base/91279 branch from f1eb8a9 to 855f0a3 Compare March 14, 2026 12:06

graphite-app bot changed the base branch from graphite-base/91279 to canary March 14, 2026 12:07

mischnic force-pushed the mischnic/layout-segment-chunkgroupentry-shared branch from d27300e to 3171e2c Compare March 14, 2026 12:07

mischnic added 2 commits March 15, 2026 23:33

Turbopack: use ChunkGroup::Shared, part 2

a73232d

fixup

a2bb760

mischnic force-pushed the mischnic/layout-segment-chunkgroupentry-shared branch from 3171e2c to a2bb760 Compare March 15, 2026 22:41

sokra approved these changes Mar 16, 2026

View reviewed changes

mischnic merged commit d9751ea into canary Mar 16, 2026
290 of 292 checks passed

mischnic deleted the mischnic/layout-segment-chunkgroupentry-shared branch March 16, 2026 11:02

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

Turbopack: use ChunkGroupEntry::Shared, part 2#91279

Turbopack: use ChunkGroupEntry::Shared, part 2#91279
mischnic merged 2 commits intocanaryfrom
mischnic/layout-segment-chunkgroupentry-shared

mischnic commented Mar 12, 2026 •

edited

Loading

Uh oh!

mischnic commented Mar 12, 2026 •

edited

Loading

Uh oh!

codspeed-hq bot commented Mar 12, 2026 •

edited

Loading

Uh oh!

nextjs-bot commented Mar 12, 2026 •

edited

Loading

Uh oh!

nextjs-bot commented Mar 12, 2026 •

edited

Loading

⚡ Dev Server

📦 Dev Server (Webpack)

⚡ Production Builds

📦 Production Builds (Webpack)

Bundle Sizes

⚡ Turbopack

📦 Webpack

🔄 Shared (bundler-independent)

Uh oh!

Uh oh!

Reviewers

Assignees

Labels

Projects

Milestone

Development

Uh oh!

3 participants

Conversation

mischnic commented Mar 12, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

mischnic commented Mar 12, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

codspeed-hq bot commented Mar 12, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Merging this PR will not alter performance

Footnotes

Uh oh!

nextjs-bot commented Mar 12, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Tests Passed

Uh oh!

nextjs-bot commented Mar 12, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Stats from current PR

✅ No significant changes detected

⚡ Dev Server

📦 Dev Server (Webpack)

⚡ Production Builds

📦 Production Builds (Webpack)

Bundle Sizes

⚡ Turbopack

📦 Webpack

🔄 Shared (bundler-independent)

Uh oh!

Uh oh!

Reviewers

Assignees

Labels

Projects

Milestone

Development

Uh oh!

3 participants

mischnic commented Mar 12, 2026 •

edited

Loading

mischnic commented Mar 12, 2026 •

edited

Loading

codspeed-hq bot commented Mar 12, 2026 •

edited

Loading

nextjs-bot commented Mar 12, 2026 •

edited

Loading

nextjs-bot commented Mar 12, 2026 •

edited

Loading