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[16.x] [turbopack] Collapse nested promises in the analyzer - #96675

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lukesandberg merged 1 commit into
next-16-3from
backport-96601-to-next-16-3
Aug 4, 2026
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[16.x] [turbopack] Collapse nested promises in the analyzer#96675
lukesandberg merged 1 commit into
next-16-3from
backport-96601-to-next-16-3

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@sampoder sampoder commented Aug 4, 2026
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Backports #96601 ([turbopack] Collapse nested promises in the analyzer) to next-16-3.

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Stats from current PR

🔴 1 regression, 1 improvement

Metric Canary PR Change Trend
node_modules Size 552 MB 552 MB 🔴 +62.6 kB (+0%) █████
Webpack Build Time 24.720s 24.088s 🟢 632ms (-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) 814ms 813ms ✓ █▂▁▂▂
Cold (Ready in log) 792ms 787ms ✓ █▂▁▁▂
Cold (First Request) 1.314s 1.302s ✓ █▂▁▁▂
Warm (Listen) 814ms 814ms ✓ █▂▁▁▂
Warm (Ready in log) 786ms 788ms ✓ █▂▁▁▁
Warm (First Request) 1.289s 1.292s ✓ █▆▅▅▅
📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric Canary PR Change Trend
Cold (Listen) 813ms 812ms ✓ ▅█▁▁▄
Cold (Ready in log) 786ms 780ms ✓ ▄█▁▁▂
Cold (First Request) 3.372s 3.368s ✓ ▅█▁▁▂
Warm (Listen) 813ms 812ms ✓ ▅█▁▁▄
Warm (Ready in log) 788ms 787ms ✓ ▄█▁▁▂
Warm (First Request) 3.418s 3.380s ✓ ▄█▁▁▁

⚡ Production Builds

Metric Canary PR Change Trend
Fresh Build 6.046s 5.822s ✓ █▂▁▁▁
Cached Build 3.002s 3.003s ✓ ▄▁▁▁▁
📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric Canary PR Change Trend
Fresh Build 24.720s 24.088s 🟢 632ms (-3%) ▆█▁▁▃
Cached Build 24.542s 24.064s ✓ ▄█▁▁▃
node_modules Size 552 MB 552 MB 🔴 +62.6 kB (+0%) █████
📦 Bundle Sizes

Bundle Sizes

⚡ Turbopack

Client

Main Bundles
Canary PR Change
0a-p0meqxynjz.js gzip 8000 10.3 kB N/A -
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0cz1d0mv5g_q7.js gzip 39.4 kB 39.4 kB ✓
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17b30c5w2jqvy.js gzip 160 B N/A -
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1kk-1wg8k7mok.js gzip 161 B N/A -
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1tf1phijqlx9j.js gzip 220 B 220 B ✓
1tw002sq5bo4l.js gzip 10 kB N/A -
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28ldracwhxjtk.js gzip 46.3 kB N/A -
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3utl0u0c4rnt6.js gzip 154 B N/A -
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turbopack-0_..x_qg.js gzip 3.84 kB N/A -
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turbopack-0f..9yja.js gzip 3.84 kB N/A -
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turbopack-1c..j026.js gzip 3.84 kB N/A -
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turbopack-1q..w7g-.js gzip 3.84 kB N/A -
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19v97848yrjp7.js gzip N/A 8.81 kB -
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1oi9pltr_e10m.js gzip N/A 10.6 kB -
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2-vaxeersfyww.js gzip N/A 71.4 kB -
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2paprmyioq1z0.js gzip N/A 156 B -
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341h71ln1jpl3.js gzip N/A 2.29 kB -
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turbopack-3g..kwu1.js gzip N/A 3.84 kB -
Total 450 kB 450 kB ⚠️ +59 B

Server

Middleware
Canary PR Change
middleware-b..fest.js gzip 778 B 775 B ✓
Total 778 B 775 B ✅ -3 B
Build Details
Build Manifests
Canary PR Change
_buildManifest.js gzip 434 B 430 B ✓
Total 434 B 430 B ✅ -4 B
Build Cache
Canary PR Change
00000001.sst gzip 14.7 MB 15.2 MB 🔴 +485 kB (+3%)
00000002.sst gzip 14.7 MB 13.4 MB 🟢 1.3 MB (-9%)
00000003.sst gzip 14.3 MB 13 MB 🟢 1.25 MB (-9%)
00000004.sst gzip 11.6 MB 13.6 MB 🔴 +2.09 MB (+18%)
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00000006.sst gzip 10.3 MB 2.83 MB 🟢 7.45 MB (-72%)
00000007.sst gzip 59 B 59 B ✓
00000008.meta gzip 89 B 89 B ✓
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00000011.meta gzip 298 kB 298 kB ✓
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00000020.sst gzip 59 B 59 B ✓
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00000026.sst gzip 59 B 59 B ✓
00000027.meta gzip 116 B 116 B ✓
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00000032.sst gzip 59 B 59 B ✓
00000033.meta gzip 116 B 116 B ✓
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00000035.meta gzip 370 kB 370 kB ✓
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00000038.sst gzip 59 B 59 B ✓
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00000041.meta gzip 370 kB 370 kB ✓
CURRENT gzip 24 B 24 B ✓
LOG gzip 673 B 685 B 🔴 +12 B (+2%)
Total 80.5 MB 80.5 MB ⚠️ +11.3 kB

📦 Webpack

Client

Main Bundles
Canary PR Change
3322-HASH.js gzip 65 kB N/A -
4191.HASH.js gzip 169 B N/A -
7920-HASH.js gzip 4.68 kB N/A -
9784-HASH.js gzip 5.63 kB N/A -
b1ad9f4c-HASH.js gzip 63.2 kB N/A -
framework-HASH.js gzip 59.7 kB 59.7 kB ✓
main-app-HASH.js gzip 254 B 254 B ✓
main-HASH.js gzip 40 kB 40 kB ✓
webpack-HASH.js gzip 1.68 kB 1.68 kB ✓
3577.HASH.js gzip N/A 168 B -
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8590-HASH.js gzip N/A 5.61 kB -
9750-HASH.js gzip N/A 4.69 kB -
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Total 240 kB 241 kB ⚠️ +711 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 ✓
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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 ⚠️ +1 B

Server

Edge SSR
Canary PR Change
edge-ssr.js gzip 129 kB 128 kB ✓
page.js gzip 293 kB 294 kB ✓
Total 422 kB 422 kB ⚠️ +426 B
Middleware
Canary PR Change
middleware-b..fest.js gzip 618 B 615 B ✓
middleware-r..fest.js gzip 156 B 156 B ✓
middleware.js gzip 45.8 kB 45.2 kB 🟢 553 B (-1%)
edge-runtime..pack.js gzip 842 B 842 B ✓
Total 47.4 kB 46.9 kB ✅ -556 B
Build Details
Build Manifests
Canary PR Change
_buildManifest.js gzip 718 B 718 B ✓
Total 718 B 718 B ✓
Build Cache
Canary PR Change
0.pack gzip 4.87 MB 4.86 MB ✓
index.pack gzip 123 kB 122 kB ✓
index.pack.old gzip 124 kB 123 kB ✓
Total 5.11 MB 5.11 MB ✅ -3.53 kB

🔄 Shared (bundler-independent)

Runtimes
Canary PR Change
app-page-exp...dev.js gzip 373 kB 373 kB ✓
app-page-exp..prod.js gzip 206 kB 206 kB ✓
app-page-tur...dev.js gzip 373 kB 373 kB ✓
app-page-tur..prod.js gzip 206 kB 206 kB ✓
app-page-tur...dev.js gzip 369 kB 369 kB ✓
app-page-tur..prod.js gzip 203 kB 203 kB ✓
app-page.run...dev.js gzip 369 kB 369 kB ✓
app-page.run..prod.js gzip 204 kB 204 kB ✓
app-route-ex...dev.js gzip 83 kB 83 kB ✓
app-route-ex..prod.js gzip 56.1 kB 56.1 kB ✓
app-route-tu...dev.js gzip 83.1 kB 83.1 kB ✓
app-route-tu..prod.js gzip 56.2 kB 56.2 kB ✓
app-route-tu...dev.js gzip 82.6 kB 82.6 kB ✓
app-route-tu..prod.js gzip 55.9 kB 55.9 kB ✓
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app-route.ru..prod.js gzip 55.9 kB 55.9 kB ✓
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dev-validati...dev.js gzip 133 kB 133 kB ✓
dev-validati...dev.js gzip 131 kB 131 kB ✓
dev-validati...dev.js gzip 131 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 kB 46 kB ✓
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pages-api.ru...dev.js gzip 45.9 kB 45.9 kB ✓
pages-api.ru..prod.js gzip 34.3 kB 34.3 kB ✓
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pages.runtim..prod.js gzip 39.8 kB 39.8 kB ✓
server.runti..prod.js gzip 66.9 kB 66.9 kB ✓
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use-cache-pr...dev.js gzip 72.1 kB 72.1 kB ✓
use-cache-pr...dev.js gzip 70.4 kB 70.4 kB ✓
use-cache-pr...dev.js gzip 70.4 kB 70.4 kB ✓
Total 4.09 MB 4.09 MB ⚠️ +571 B
📝 Changed Files (14 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
  • dev-validati..ntime.dev.js
  • dev-validati..ntime.dev.js
  • dev-validati..ntime.dev.js
  • dev-validati..ntime.dev.js
  • pages-api.runtime.dev.js
  • pages.runtime.dev.js
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dev-validati..ntime.dev.js

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dev-validati..ntime.dev.js

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dev-validati..ntime.dev.js

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pages-api.runtime.dev.js

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pages.runtime.dev.js

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📎 Tarball URL 
https://vercel-packages.vercel.app/next/commits/9b49510472d332bd4a8c69a9aa481f340dcad208/next

Commit: 9b49510

@github-actions
github-actions Bot commented Aug 4, 2026 •
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Tests Passed

Commit: 9b49510

@sampoder
sampoder marked this pull request as ready for review August 4, 2026 20:30
@sampoder
sampoder requested a review from lukesandberg August 4, 2026 20:30
@lukesandberg
lukesandberg merged commit b20f297 into next-16-3 Aug 4, 2026
116 checks passed
@lukesandberg
lukesandberg deleted the backport-96601-to-next-16-3 branch August 4, 2026 21:13
@eps1lon eps1lon changed the title [backport] [turbopack] Collapse nested promises in the analyzer [16.x] [turbopack] Collapse nested promises in the analyzer Aug 6, 2026
@ZacxDev ZacxDev mentioned this pull request Aug 18, 2026
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