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[16.3.x] Fix Turbopack worker chunk loading with asset prefix - #97419

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timneutkens merged 2 commits into
next-16-3from
codex/backport-96636-to-next-16-3
Aug 20, 2026
Merged

[16.3.x] Fix Turbopack worker chunk loading with asset prefix#97419
timneutkens merged 2 commits into
next-16-3from
codex/backport-96636-to-next-16-3

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## Summary

- propagate the effective worker asset prefix through the worker
bootstrap so runtime chunk registration and loading use the same base
path
- verify workers execute with both explicit and empty
`turbopackWorkerAssetPrefix` overrides
- add coverage for the Resvg WASM worker reproduction

Fixes #96613

## Verification

- `NEXT_TEST_PREFER_OFFLINE=1 pnpm test-start-turbo
test/e2e/turbopack-worker-asset-prefix/turbopack-worker-asset-prefix.test.ts`
- `NEXT_TEST_PREFER_OFFLINE=1 pnpm test-dev-turbo
test/e2e/turbopack-worker-asset-prefix/turbopack-worker-asset-prefix.test.ts`
- Resvg WASM worker test in production and development Turbopack
- focused `turbopack-tests` worker and ignore-comments snapshots
- `pnpm swc-build-native`
- Full `pnpm build-all` did not complete locally because of unrelated
existing `httpxy` and proxy-request type errors

<!-- NEXT_JS_LLM -->

---------

Co-authored-by: Tobias Koppers <tobias.koppers@googlemail.com>
(cherry picked from commit 7577fa3)
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Tests Passed

Commit: e540f2e

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Stats from current PR

🟢 3 improvements

Metric Canary PR Change Trend
node_modules Size 554 MB 553 MB 🟢 1.51 MB (0%) ▁████
Webpack Cold (First Request) 3.448s 3.323s 🟢 125ms (-4%) ▂▆█▆▂
Webpack Warm (First Request) 3.450s 3.342s 🟢 108ms (-3%) ▃▆█▅▃
📊 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) 812ms 813ms ▁▁▁▁▁
Cold (Ready in log) 791ms 784ms ▁▁▂▁▁
Cold (First Request) 1.250s 1.289s ▁▁▃▂▂
Warm (Listen) 813ms 813ms ▁▁▂▁▁
Warm (Ready in log) 802ms 785ms ▁▁▂▂▁
Warm (First Request) 1.261s 1.287s ▆▇██▇
📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric Canary PR Change Trend
Cold (Listen) 813ms 812ms ▇▇▇▇█
Cold (Ready in log) 814ms 779ms ▂█▇▅▄
Cold (First Request) 3.448s 3.323s 🟢 125ms (-4%) ▂▆█▆▂
Warm (Listen) 813ms 813ms █████
Warm (Ready in log) 809ms 792ms ▄▇█▆▆
Warm (First Request) 3.450s 3.342s 🟢 108ms (-3%) ▃▆█▅▃

⚡ Production Builds

Metric Canary PR Change Trend
Fresh Build 5.579s 5.689s ▁▁▄▄▂
Cached Build 2.923s 2.895s ▁▁▄▃▂
📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric Canary PR Change Trend
Fresh Build 24.960s 24.928s ▃▆▆▃▃
Cached Build 25.068s 24.762s ▅▆█▅▄
node_modules Size 554 MB 553 MB 🟢 1.51 MB (0%) ▁████
📦 Bundle Sizes

Bundle Sizes

⚡ Turbopack

Client

Main Bundles
Canary PR Change
03w7r9j3lejb_.js gzip 154 B N/A -
050icza-xjz0i.js gzip 5.73 kB N/A -
07jdby0ue616s.js gzip 450 B N/A -
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1-3y752pkth5-.js gzip 10 kB N/A -
19gb-1_5udxfb.js gzip 13.2 kB N/A -
1cz3ginsmcle0.js gzip 154 B N/A -
1elt1qium-r2m.css gzip 115 B 115 B
1tf1phijqlx9j.js gzip 220 B 220 B
1uzabyd1120a1.js gzip 8.71 kB N/A -
1x38nkal_v7pc.js gzip 155 B N/A -
2_ln1vao-rk0y.js gzip 157 B N/A -
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22ayitm_chlxg.js gzip 156 B N/A -
28dhc6t85q1_p.js gzip 8.78 kB N/A -
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2pflec0m3q9fw.js gzip 154 B N/A -
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2vmba87tvhgta.js gzip 151 B N/A -
2vxi673cz1-t4.js gzip 8.79 kB N/A -
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2xejdu2qay51r.js gzip 71.6 kB N/A -
38-q43pzktqhs.js gzip 1.46 kB N/A -
3f977fytahn5a.js gzip 7.53 kB N/A -
3lh70vgwg4fu0.js gzip 157 B N/A -
3lrfocd661skw.js gzip 65.6 kB N/A -
3nbojhxiy1qv_.js gzip 13.7 kB N/A -
3r9mg09sag_yr.js gzip 47 kB N/A -
3wvoy-0kg4nyj.js gzip 155 B N/A -
41u5s3oe2-erp.js gzip 2.29 kB N/A -
443fsfu98ohj2.js gzip 154 B N/A -
445s_9hf8o7ao.js gzip 8.76 kB N/A -
turbopack-0d..9ejy.js gzip 3.74 kB N/A -
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14j95hw2e7a3z.js gzip N/A 8.74 kB -
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1frm88k70_rxf.js gzip N/A 8.78 kB -
1sw-3udjjm8tn.js gzip N/A 156 B -
1ynlcmklb8_j3.js gzip N/A 9.45 kB -
1z8mo3qhn8sjx.js gzip N/A 71.4 kB -
211gfm233vnxp.js gzip N/A 156 B -
21rbomn5ucvi9.js gzip N/A 7.45 kB -
2307m3bxzu-lk.js gzip N/A 153 B -
2a_p4b_g75xdo.js gzip N/A 8.8 kB -
2d3j86ktn7rzb.js gzip N/A 157 B -
2dn0ae5-nmkio.js gzip N/A 13.6 kB -
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2kolt5lwxt8o0.js gzip N/A 10 kB -
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38v3pncooy-ug.js gzip N/A 154 B -
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3y0of5nncl2hl.js gzip N/A 154 B -
turbopack-02..0bws.js gzip N/A 3.84 kB -
turbopack-0w..vu5q.js gzip N/A 3.84 kB -
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turbopack-2h..5ii8.js gzip N/A 3.85 kB -
turbopack-2q..kw-y.js gzip N/A 3.85 kB -
turbopack-2s.._2tz.js gzip N/A 3.85 kB -
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turbopack-3b..cq-1.js gzip N/A 3.85 kB -
turbopack-3h..yo3p.js gzip N/A 3.84 kB -
turbopack-3k..qq9l.js gzip N/A 3.84 kB -
turbopack-3s..0903.js gzip N/A 3.85 kB -
turbopack-3y..s518.js gzip N/A 3.85 kB -
Total 401 kB 451 kB ⚠️ +49.3 kB

Server

Middleware
Canary PR Change
middleware-b..fest.js gzip 1.05 kB 779 B 🟢 276 B (-26%)
Total 1.05 kB 779 B ✅ -276 B
Build Details
Build Manifests
Canary PR Change
_buildManifest.js gzip 879 B 434 B 🟢 445 B (-51%)
Total 879 B 434 B ✅ -445 B
Build Cache
Canary PR Change
00000001.sst gzip 13.2 MB 14.2 MB 🔴 +1.03 MB (+8%)
00000002.sst gzip 10.5 MB 15.2 MB 🔴 +4.64 MB (+44%)
00000003.sst gzip 15.1 MB 13 MB 🟢 2.15 MB (-14%)
00000004.sst gzip 16.7 MB 13.1 MB 🟢 3.61 MB (-22%)
00000005.sst gzip 10.2 MB 10.3 MB 🔴 +51.3 kB (+1%)
00000006.sst gzip 2.8 MB 2.84 MB 🔴 +33 kB (+1%)
00000007.sst gzip 59 B 59 B
00000008.meta gzip 89 B 89 B
00000009.meta gzip 298 kB 299 kB
00000010.meta gzip 298 kB 298 kB
00000011.meta gzip 298 kB 298 kB
00000012.sst gzip 52 kB 51.5 kB 🟢 521 B (-1%)
00000013.sst gzip 1.87 MB 1.88 MB 🔴 +13.1 kB (+1%)
00000014.sst gzip 59 B 59 B
00000015.meta gzip 116 B 116 B
00000016.meta gzip 328 kB 324 kB 🟢 3.12 kB (-1%)
00000017.meta gzip 407 kB 405 kB 🟢 2.58 kB (-1%)
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00000019.sst gzip 1.4 MB 1.38 MB 🟢 15.1 kB (-1%)
00000020.sst gzip 59 B 59 B
00000021.meta gzip 116 B 116 B
00000022.meta gzip 328 kB 324 kB 🟢 3.12 kB (-1%)
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00000024.sst gzip 52.9 kB 52.2 kB 🟢 663 B (-1%)
00000025.sst gzip 1.4 MB 1.38 MB 🟢 15.1 kB (-1%)
00000026.sst gzip 59 B 59 B
00000027.meta gzip 116 B 116 B
00000028.meta gzip 328 kB 324 kB 🟢 3.12 kB (-1%)
00000029.meta gzip 373 kB 371 kB 🟢 2.77 kB (-1%)
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00000032.sst gzip 59 B 59 B
00000033.meta gzip 116 B 116 B
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00000038.sst gzip 59 B 59 B
00000039.meta gzip 116 B 116 B
00000040.meta gzip 328 kB 324 kB 🟢 3.12 kB (-1%)
00000041.meta gzip 373 kB 371 kB 🟢 2.77 kB (-1%)
CURRENT gzip 94 B 92 B 🟢 2 B (-2%)
LOG gzip 672 B 673 B
Total 80.7 MB 80.7 MB ✅ -76.3 kB

📦 Webpack

Client

Main Bundles
Canary PR Change
3322-HASH.js gzip 66.1 kB N/A -
4191.HASH.js gzip 169 B N/A -
7920-HASH.js gzip 4.67 kB N/A -
9784-HASH.js gzip 5.63 kB N/A -
b1ad9f4c-HASH.js gzip 63.5 kB N/A -
framework-HASH.js gzip 59.7 kB 59.7 kB
main-app-HASH.js gzip 253 B 254 B
main-HASH.js gzip 40.2 kB 40 kB
webpack-HASH.js gzip 1.68 kB 1.68 kB
3577.HASH.js gzip N/A 168 B -
578-HASH.js gzip N/A 66.2 kB -
8590-HASH.js gzip N/A 5.6 kB -
9750-HASH.js gzip N/A 4.68 kB -
a8984546-HASH.js gzip N/A 63.2 kB -
Total 242 kB 241 kB ✅ -548 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 181 B 182 B
css-HASH.js gzip 334 B 331 B
dynamic-HASH.js gzip 1.81 kB 1.81 kB
edge-ssr-HASH.js gzip 255 B 253 B
head-HASH.js gzip 349 B 351 B
hooks-HASH.js gzip 382 B 384 B
image-HASH.js gzip 581 B 582 B
index-HASH.js gzip 260 B 259 B
link-HASH.js gzip 2.48 kB 2.48 kB
routerDirect..HASH.js gzip 317 B 318 B
script-HASH.js gzip 384 B 386 B
withRouter-HASH.js gzip 316 B 315 B
1afbb74e6ecf..834.css gzip 106 B 106 B
Total 7.95 kB 7.95 kB ✅ -2 B

Server

Edge SSR
Canary PR Change
edge-ssr.js gzip 129 kB 128 kB
page.js gzip 294 kB 295 kB
Total 423 kB 423 kB ✅ -430 B
Middleware
Canary PR Change
middleware-b..fest.js gzip 618 B 617 B
middleware-r..fest.js gzip 156 B 156 B
middleware.js gzip 46 kB 45.7 kB
edge-runtime..pack.js gzip 842 B 842 B
Total 47.6 kB 47.3 kB ✅ -275 B
Build Details
Build Manifests
Canary PR Change
_buildManifest.js gzip 717 B 718 B
Total 717 B 718 B ⚠️ +1 B
Build Cache
Canary PR Change
0.pack gzip 4.83 MB 4.92 MB 🔴 +90 kB (+2%)
index.pack gzip 123 kB 123 kB
index.pack.old gzip 123 kB 122 kB
Total 5.08 MB 5.17 MB ⚠️ +89.8 kB

🔄 Shared (bundler-independent)

Runtimes
Canary PR Change
app-page-exp...dev.js gzip 376 kB 374 kB 🟢 2.09 kB (-1%)
app-page-exp..prod.js gzip 207 kB 206 kB
app-page-tur...dev.js gzip 375 kB 373 kB 🟢 2.08 kB (-1%)
app-page-tur..prod.js gzip 206 kB 206 kB
app-page-tur...dev.js gzip 372 kB 370 kB
app-page-tur..prod.js gzip 204 kB 204 kB
app-page.run...dev.js gzip 372 kB 370 kB
app-page.run..prod.js gzip 204 kB 204 kB
app-route-ex...dev.js gzip 83.2 kB 83.4 kB
app-route-ex..prod.js gzip 56.2 kB 56.5 kB
app-route-tu...dev.js gzip 83.2 kB 83.4 kB
app-route-tu..prod.js gzip 56.2 kB 56.5 kB
app-route-tu...dev.js gzip 82.8 kB 83 kB
app-route-tu..prod.js gzip 56 kB 56.2 kB
app-route.ru...dev.js gzip 82.8 kB 83 kB
app-route.ru..prod.js gzip 55.9 kB 56.2 kB
dev-validati...dev.js gzip 134 kB 133 kB
dev-validati...dev.js gzip 134 kB 133 kB
dev-validati...dev.js gzip 132 kB 131 kB
dev-validati...dev.js gzip 132 kB 131 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 46.5 kB 46.3 kB
pages-api-tu..prod.js gzip 34.7 kB 34.6 kB
pages-api.ru...dev.js gzip 46.5 kB 46.3 kB
pages-api.ru..prod.js gzip 34.7 kB 34.6 kB
pages-turbo....dev.js gzip 55.3 kB 55.1 kB
pages-turbo...prod.js gzip 40.2 kB 40.2 kB
pages.runtim...dev.js gzip 55.3 kB 55.1 kB
pages.runtim..prod.js gzip 40.2 kB 40.1 kB
server.runti..prod.js gzip 66.6 kB 67.3 kB 🔴 +668 B (+1%)
use-cache-pr...dev.js gzip 72.7 kB 72.4 kB
use-cache-pr...dev.js gzip 72.7 kB 72.4 kB
use-cache-pr...dev.js gzip 70.9 kB 70.7 kB
use-cache-pr...dev.js gzip 70.9 kB 70.7 kB
Total 4.11 MB 4.1 MB ✅ -9.63 kB
📝 Changed Files (33 files)

Files with changes:

  • app-page-exp..ntime.dev.js
  • app-page-exp..time.prod.js
  • app-page-tur..ntime.dev.js
  • app-page-tur..time.prod.js
  • app-page-tur..ntime.dev.js
  • app-page-tur..time.prod.js
  • app-page.runtime.dev.js
  • app-page.runtime.prod.js
  • app-route-ex..ntime.dev.js
  • app-route-ex..time.prod.js
  • app-route-tu..ntime.dev.js
  • app-route-tu..time.prod.js
  • app-route-tu..ntime.dev.js
  • app-route-tu..time.prod.js
  • app-route.runtime.dev.js
  • app-route.ru..time.prod.js
  • dev-validati..ntime.dev.js
  • dev-validati..ntime.dev.js
  • dev-validati..ntime.dev.js
  • dev-validati..ntime.dev.js
  • ... and 13 more
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📎 Tarball URL
https://vercel-packages.vercel.app/next/commits/e540f2e3d09bc275ae3dd4b84fbfa88f6988157d/next

Commit: e540f2e

@timneutkens
timneutkens marked this pull request as ready for review August 18, 2026 10:57
@eps1lon eps1lon changed the title [backport] Fix Turbopack worker chunk loading with asset prefix [16.3.x] Fix Turbopack worker chunk loading with asset prefix Aug 18, 2026
@timneutkens
timneutkens merged commit cd714d9 into next-16-3 Aug 20, 2026
519 of 546 checks passed
@timneutkens
timneutkens deleted the codex/backport-96636-to-next-16-3 branch August 20, 2026 07:39
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