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Upgrade React from f789f203-20260825 to a1124489-20260826 - #97950

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Upgrade React from f789f203-20260825 to a1124489-20260826#97950
next-js-bot[bot] wants to merge 7 commits into
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update/react/19.3.0-canary-a1124489-20260826

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next-js-bot Bot enabled auto-merge (squash) August 26, 2026 16:58
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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) 814ms 814ms ✓ ▂▂▂▂█
Cold (Ready in log) 820ms 819ms ✓ ▁▁▁▁█
Cold (First Request) 1.318s 1.324s ✓ ▁▁▁▁█
Warm (Listen) 816ms 814ms ✓ ▂▁▂▂█
Warm (Ready in log) 821ms 818ms ✓ ▁▁▁▁█
Warm (First Request) 1.321s 1.324s ✓ ▁▁▁▁█
📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric Canary PR Change Trend
Cold (Listen) 813ms 812ms ✓ ▁▁▁▁█
Cold (Ready in log) 805ms 810ms ✓ ▁▁▂▁█
Cold (First Request) 3.412s 3.408s ✓ ▂▁▂▁█
Warm (Listen) 812ms 813ms ✓ ▁▁▁▁▇
Warm (Ready in log) 808ms 812ms ✓ ▁▁▂▁█
Warm (First Request) 3.479s 3.508s ✓ ▁▁▂▁█

⚡ Production Builds

Metric Canary PR Change Trend
Fresh Build 5.933s 6.049s ✓ ▁▁▁▂█
Cached Build 3.197s 3.189s ✓ ▁▁▁▁█
📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric Canary PR Change Trend
Fresh Build 25.196s 24.849s ✓ ▁▁▂▁█
Cached Build 24.964s 25.201s ✓ ▁▁▂▁█
node_modules Size 557 MB 557 MB ✓ █████
📦 Bundle Sizes

Bundle Sizes

⚡ Turbopack

Client

Main Bundles
Canary PR Change
017_4moyv5m34.js gzip 117 B 117 B ✓
05jocc85-b73_.js gzip 341 B N/A -
0cz1d0mv5g_q7.js gzip 39.4 kB 39.4 kB ✓
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1nigpy_mr0xvj.js gzip 339 B N/A -
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2ca40xittx95r.js gzip 8.75 kB N/A -
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2rtriq9lc6zj-.js gzip 116 B N/A -
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342di-crrg9kq.js gzip 119 B N/A -
36hfc2_979aw2.js gzip 119 B N/A -
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3dl1ilk37-30g.js gzip 117 B N/A -
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3kvxagoobts7h.js gzip 117 B N/A -
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41u5s3oe2-erp.js gzip 2.29 kB N/A -
turbopack-0d..9ejy.js gzip 3.74 kB 3.74 kB ✓
02zc7sqlpqxn3.js gzip N/A 119 B -
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137xup2t69ovc.js gzip N/A 1.97 kB -
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20qhkyyj2_tla.js gzip N/A 116 B -
24y_m4562k-05.js gzip N/A 71.5 kB -
2imyufe18bsb7.js gzip N/A 1.36 kB -
2p4n3-8-xixh_.js gzip N/A 341 B -
2vqdfieehz5do.js gzip N/A 8.75 kB -
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34knadd6wu9qg.js gzip N/A 119 B -
37b0_t16yn97f.js gzip N/A 153 B -
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3d61tgick8g6b.js gzip N/A 46.8 kB -
3t121tj-h0kbm.js gzip N/A 125 B -
Total 299 kB 299 kB ⚠️ +3 B

Server

Middleware
Canary PR Change
middleware-b..fest.js gzip 1.02 kB 1.02 kB ✓
Total 1.02 kB 1.02 kB ✓
Build Details
Build Manifests
Canary PR Change
_buildManifest.js gzip 846 B 847 B ✓
Total 846 B 847 B ⚠️ +1 B
Build Cache
Canary PR Change
00000001.sst gzip 13.3 MB 14.6 MB 🔴 +1.25 MB (+9%)
00000002.sst gzip 13.3 MB 12.4 MB 🟢 827 kB (-6%)
00000003.sst gzip 14.3 MB 12.7 MB 🟢 1.63 MB (-11%)
00000004.sst gzip 14 MB 15.2 MB 🔴 +1.22 MB (+9%)
00000005.sst gzip 2.75 MB 10.1 MB 🔴 +7.32 MB (+266%)
00000006.sst gzip 10.1 MB 2.75 MB 🟢 7.32 MB (-73%)
00000007.sst gzip 59 B 59 B ✓
00000008.meta gzip 89 B 89 B ✓
00000009.meta gzip 297 kB 297 kB ✓
00000010.meta gzip 297 kB 297 kB ✓
00000011.meta gzip 297 kB 297 kB ✓
00000012.sst gzip 53.7 kB 52.9 kB 🟢 816 B (-2%)
00000013.sst gzip 1.77 MB 1.78 MB 🔴 +9.89 kB (+1%)
00000014.sst gzip 59 B 59 B ✓
00000015.meta gzip 116 B 116 B ✓
00000016.meta gzip 327 kB 327 kB ✓
00000017.meta gzip 404 kB 404 kB ✓
00000018.sst gzip 54.5 kB 53.6 kB 🟢 944 B (-2%)
00000019.sst gzip 1.35 MB 1.37 MB 🔴 +13.9 kB (+1%)
00000020.sst gzip 59 B 59 B ✓
00000021.meta gzip 116 B 116 B ✓
00000022.meta gzip 327 kB 327 kB ✓
00000023.meta gzip 371 kB 372 kB ✓
00000024.sst gzip 54.6 kB 53.6 kB 🟢 945 B (-2%)
00000025.sst gzip 1.35 MB 1.37 MB 🔴 +14 kB (+1%)
00000026.sst gzip 59 B 59 B ✓
00000027.meta gzip 116 B 116 B ✓
00000028.meta gzip 327 kB 327 kB ✓
00000029.meta gzip 371 kB 372 kB ✓
00000030.sst gzip 53.7 kB 53 kB 🟢 642 B (-1%)
00000031.sst gzip 1.35 MB 1.37 MB 🔴 +13.9 kB (+1%)
00000032.sst gzip 59 B 59 B ✓
00000033.meta gzip 116 B 116 B ✓
00000034.meta gzip 327 kB 327 kB ✓
00000035.meta gzip 371 kB 372 kB ✓
00000036.sst gzip 54.4 kB 53.7 kB 🟢 741 B (-1%)
00000037.sst gzip 1.35 MB 1.37 MB 🔴 +13.9 kB (+1%)
00000038.sst gzip 59 B 59 B ✓
00000039.meta gzip 116 B 116 B ✓
00000040.meta gzip 327 kB 327 kB ✓
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CURRENT gzip 94 B 94 B ✓
LOG gzip 667 B 670 B ✓
Total 79.6 MB 79.7 MB ⚠️ +87.3 kB

📦 Webpack

Client

Main Bundles
Canary PR Change
3322-HASH.js gzip 65.7 kB N/A -
4191.HASH.js gzip 169 B N/A -
9784-HASH.js gzip 5.6 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 254 B 253 B ✓
main-HASH.js gzip 39.8 kB 39.7 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 65.8 kB -
8590-HASH.js gzip N/A 5.57 kB -
a8984546-HASH.js gzip N/A 63.5 kB -
Total 236 kB 237 kB ⚠️ +105 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 5.05 kB 5.05 kB ✓
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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 12.4 kB 12.4 kB ✅ -3 B

Server

Edge SSR
Canary PR Change
edge-ssr.js gzip 128 kB 128 kB ✓
page.js gzip 293 kB 293 kB ✓
Total 422 kB 421 kB ✅ -439 B
Middleware
Canary PR Change
middleware-b..fest.js gzip 599 B 602 B ✓
middleware-r..fest.js gzip 156 B 156 B ✓
middleware.js gzip 45.9 kB 45.3 kB 🟢 538 B (-1%)
edge-runtime..pack.js gzip 842 B 842 B ✓
Total 47.5 kB 46.9 kB ✅ -535 B
Build Details
Build Manifests
Canary PR Change
_buildManifest.js gzip 699 B 700 B ✓
Total 699 B 700 B ⚠️ +1 B
Build Cache
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0.pack gzip 4.8 MB 4.79 MB 🟢 8.69 kB (0%)
index.pack gzip 123 kB 123 kB ✓
index.pack.old gzip 123 kB 123 kB ✓
Total 5.05 MB 5.04 MB ✅ -8.69 kB

🔄 Shared (bundler-independent)

Runtimes
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app-page-exp...dev.js gzip 375 kB 375 kB ✓
app-page-exp..prod.js gzip 206 kB 206 kB ✓
app-page-tur...dev.js gzip 374 kB 374 kB ✓
app-page-tur..prod.js gzip 206 kB 206 kB ✓
app-page-tur...dev.js gzip 371 kB 371 kB ✓
app-page-tur..prod.js gzip 204 kB 204 kB ✓
app-page.run...dev.js gzip 371 kB 371 kB ✓
app-page.run..prod.js gzip 204 kB 204 kB ✓
app-route-ex...dev.js gzip 82.9 kB 82.9 kB ✓
app-route-ex..prod.js gzip 55.8 kB 55.8 kB ✓
app-route-tu...dev.js gzip 82.9 kB 82.9 kB ✓
app-route-tu..prod.js gzip 55.9 kB 55.9 kB ✓
app-route-tu...dev.js gzip 82.5 kB 82.5 kB ✓
app-route-tu..prod.js gzip 55.6 kB 55.6 kB ✓
app-route.ru...dev.js gzip 82.4 kB 82.4 kB ✓
app-route.ru..prod.js gzip 55.6 kB 55.6 kB ✓
dev-validati...dev.js gzip 134 kB 134 kB ✓
dev-validati...dev.js gzip 134 kB 134 kB ✓
dev-validati...dev.js gzip 132 kB 132 kB ✓
dev-validati...dev.js gzip 132 kB 132 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 46.3 kB 46.3 kB ✓
pages-api-tu..prod.js gzip 34.3 kB 34.3 kB ✓
pages-api.ru...dev.js gzip 46.2 kB 46.2 kB ✓
pages-api.ru..prod.js gzip 34.3 kB 34.3 kB ✓
pages-turbo....dev.js gzip 54.7 kB 54.7 kB ✓
pages-turbo...prod.js gzip 39.7 kB 39.7 kB ✓
pages.runtim...dev.js gzip 54.7 kB 54.7 kB ✓
pages.runtim..prod.js gzip 39.6 kB 39.6 kB ✓
server.runti..prod.js gzip 66 kB 66 kB ✓
use-cache-pr...dev.js gzip 73.4 kB 73.4 kB ✓
use-cache-pr...dev.js gzip 73.4 kB 73.4 kB ✓
use-cache-pr...dev.js gzip 71.7 kB 71.7 kB ✓
use-cache-pr...dev.js gzip 71.6 kB 71.6 kB ✓
Total 4.1 MB 4.1 MB ✅ -31 B
📝 Changed Files (4 files)

Files with changes:

  • app-page-exp..ntime.dev.js
  • app-page-tur..ntime.dev.js
  • app-page-tur..ntime.dev.js
  • app-page.runtime.dev.js
View diffs
app-page-exp..ntime.dev.js 
failed to diff
app-page-tur..ntime.dev.js 
failed to diff
app-page-tur..ntime.dev.js 
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app-page.runtime.dev.js 
failed to diff
📎 Tarball URL 
https://vercel-packages.vercel.app/next/commits/1275a188f7f3c1126bd514482372529034adbcef/next

Commit: 1275a18

@github-actions

github-actions Bot commented Aug 26, 2026 •
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Failing test suites

Commit: 1275a18 | About building and testing Next.js

pnpm test-start test/production/app-dir/sync-io-blocks-root/sync-io-blocks-root.test.ts (job)

  • sync IO that blocks the root > does not hang the build and reports sync IO errors - with --debug-prerender > /sync-root-async-page (DD)
  • sync IO that blocks the root > does not hang the build and reports sync IO errors - with --debug-prerender > /sync-root-sync-page (DD)
Expand output

● sync IO that blocks the root › does not hang the build and reports sync IO errors - with --debug-prerender › /sync-root-async-page

expect(received).toContain(expected) // indexOf

Expected substring: "Error: Route \"/sync-root-async-page\": Next.js encountered the unstable value `Date.now()` while prerendering."
Received string:    "⚠ Prerendering is running in debug mode with NODE_ENV='development'. This will affect performance and should not be used for production.
▲ Next.js 16.4.0-canary.8 (webpack)
✓ Running next.config.js took 21ms
- Cache Components enabled
- Experiments (use with caution):
  ✓ allowDevelopmentBuild (enabled by `--debug-prerender`)
  ⨯ prerenderEarlyExit (disabled by `--debug-prerender`)
  ⨯ serverMinification (disabled by `--debug-prerender`)
  ✓ serverSourceMaps (enabled by `--debug-prerender`)
  · staticGenerationMaxConcurrency: 1
  · staticGenerationRetryCount: 1
  ✓ strictRouteTypes (enabled by `__NEXT_EXPERIMENTAL_STRICT_ROUTE_TYPES`)·
  Creating an optimized production build ...
✓ Compiled successfully in 1704ms
  Running TypeScript ...
⚠ `experimental.useTypeScriptCli` checks the complete TypeScript project; `--debug-build-paths` does not limit type checking.
  Finished TypeScript in 1377ms ...
  Collecting page data using 4 workers ...
  Generating static pages using 4 workers (0/3) ...·
> Export encountered errors on 1 path:
	/sync-root-async-page/page: /sync-root-async-page
"

  44 |         const result = await next.build({ args })
  45 |
> 46 |         expect(result.cliOutput).toContain(
     |                                  ^
  47 |           `Error: Route "${route}": Next.js encountered the unstable value \`Date.now()\` while prerendering.`
  48 |         )
  49 |         expect(result.cliOutput).not.toMatch(

  at toContain (production/app-dir/sync-io-blocks-root/sync-io-blocks-root.test.ts:46:34)

● sync IO that blocks the root › does not hang the build and reports sync IO errors - with --debug-prerender › /sync-root-sync-page

expect(received).toContain(expected) // indexOf

Expected substring: "Error: Route \"/sync-root-sync-page\": Next.js encountered the unstable value `Date.now()` while prerendering."
Received string:    "⚠ Prerendering is running in debug mode with NODE_ENV='development'. This will affect performance and should not be used for production.
▲ Next.js 16.4.0-canary.8 (webpack)
✓ Running next.config.js took 21ms
- Cache Components enabled
- Experiments (use with caution):
  ✓ allowDevelopmentBuild (enabled by `--debug-prerender`)
  ⨯ prerenderEarlyExit (disabled by `--debug-prerender`)
  ⨯ serverMinification (disabled by `--debug-prerender`)
  ✓ serverSourceMaps (enabled by `--debug-prerender`)
  · staticGenerationMaxConcurrency: 1
  · staticGenerationRetryCount: 1
  ✓ strictRouteTypes (enabled by `__NEXT_EXPERIMENTAL_STRICT_ROUTE_TYPES`)·
  Creating an optimized production build ...
✓ Compiled successfully in 1701ms
  Running TypeScript ...
⚠ `experimental.useTypeScriptCli` checks the complete TypeScript project; `--debug-build-paths` does not limit type checking.
  Finished TypeScript in 1399ms ...
  Collecting page data using 4 workers ...
  Generating static pages using 4 workers (0/3) ...·
> Export encountered errors on 1 path:
	/sync-root-sync-page/page: /sync-root-sync-page
"

  44 |         const result = await next.build({ args })
  45 |
> 46 |         expect(result.cliOutput).toContain(
     |                                  ^
  47 |           `Error: Route "${route}": Next.js encountered the unstable value \`Date.now()\` while prerendering.`
  48 |         )
  49 |         expect(result.cliOutput).not.toMatch(

  at toContain (production/app-dir/sync-io-blocks-root/sync-io-blocks-root.test.ts:46:34)

pnpm test-start-turbo test/production/deterministic-build/deployment-id.test.ts (turbopack) (job)

  • deterministic build - changing deployment id > build output API - standard adapter > should produce identical build outputs even when changing deployment id (DD)
  • deterministic build - changing deployment id > build output API - standard builder > should produce identical build outputs even when changing deployment id (DD)
Expand output

● deterministic build - changing deployment id › build output API - standard builder › should produce identical build outputs even when changing deployment id

expect(received).toBe(expected) // Object.is equality

Expected: 0
Received: 1

  143 |   // First build
  144 |   next.env['NEXT_DEPLOYMENT_ID'] = 'foo-dpl-id'
> 145 |   expect((await next.build()).exitCode).toBe(0)
      |                                         ^
  146 |   let run1 = await readFiles(next)
  147 |
  148 |   // Second build

  at toBe (production/deterministic-build/deployment-id.test.ts:145:41)
  at Object.<anonymous> (production/deterministic-build/deployment-id.test.ts:259:32)

● deterministic build - changing deployment id › build output API - standard adapter › should produce identical build outputs even when changing deployment id

expect(received).toBe(expected) // Object.is equality

Expected: 0
Received: 1

  143 |   // First build
  144 |   next.env['NEXT_DEPLOYMENT_ID'] = 'foo-dpl-id'
> 145 |   expect((await next.build()).exitCode).toBe(0)
      |                                         ^
  146 |   let run1 = await readFiles(next)
  147 |
  148 |   // Second build

  at toBe (production/deterministic-build/deployment-id.test.ts:145:41)
  at Object.<anonymous> (production/deterministic-build/deployment-id.test.ts:259:32)

@eps1lon

eps1lon commented Aug 31, 2026

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Landed in #97995

@eps1lon eps1lon closed this Aug 31, 2026
auto-merge was automatically disabled August 31, 2026 14:17

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