Upgrade React from `b546603b-20260121` to `6a0ab4d2-20260121` by nextjs-bot · Pull Request #88902 · vercel/next.js

nextjs-bot · 2026-01-22T16:27:07Z

diff facebook/react@b546603b...6a0ab4d2

React upstream changes

nextjs-bot · 2026-01-22T16:45:41Z

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)	437ms	437ms	✓	▁▁▁▁▂
Cold (First Request)	1.155s	1.177s	✓	▁▁▃▁▃
Warm (Listen)	456ms	457ms	✓	▁▁▁▁▁
Warm (Ready in log)	442ms	442ms	✓	▁▁▁▁▁
Warm (First Request)	338ms	339ms	✓	▁▂▁▂▁

📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric	Canary	PR	Change	Trend
Cold (Listen)	455ms	455ms	✓	▁▁▁▁▁
Cold (Ready in log)	437ms	436ms	✓	▁▁▁▁▁
Cold (First Request)	1.814s	1.806s	✓	▁▁▁▁▁
Warm (Listen)	456ms	455ms	✓	▁▁▁▁▁
Warm (Ready in log)	436ms	436ms	✓	▁▁▁▁▁
Warm (First Request)	1.841s	1.836s	✓	▁▁▁▁▁

⚡ Production Builds

Metric	Canary	PR	Change	Trend
Fresh Build	4.323s	4.284s	✓	▂▂▁▁▁
Cached Build	4.439s	4.380s	✓	▂▂▁▁▁

📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric	Canary	PR	Change	Trend
Fresh Build	13.933s	13.980s	✓	▁▆▃▄▂
Cached Build	14.032s	13.997s	✓	▁▇▃▄▄
node_modules Size	460 MB	460 MB	✓	▁▁▁▁▁

📦 Bundle Sizes

Bundle Sizes

⚡ Turbopack

Client

Main Bundles: **432 kB** → **432 kB** ✅ -64 B

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

Server

Middleware

	Canary	PR	Change
middleware-b..fest.js gzip	764 B	763 B	✓
Total	764 B	763 B	✅ -1 B

Build Details

Build Manifests

	Canary	PR	Change
_buildManifest.js gzip	451 B	450 B	✓
Total	451 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	52.7 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	252 B	254 B	✓
main-HASH.js gzip	38.7 kB	39.1 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	52.4 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	226 kB	226 kB	⚠️ +52 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	✓
index-HASH.js gzip	259 B	258 B	✓
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	243 kB	239 kB	🟢 4.86 kB (-2%)
Total	368 kB	363 kB	✅ -4.84 kB

Middleware

	Canary	PR	Change
middleware-b..fest.js gzip	616 B	616 B	✓
middleware-r..fest.js gzip	155 B	156 B	✓
middleware.js gzip	33.2 kB	33.2 kB	✓
edge-runtime..pack.js gzip	842 B	842 B	✓
Total	34.9 kB	34.9 kB	✓

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	3.69 MB	3.69 MB	🔴 +6.65 kB (+0%)
index.pack gzip	102 kB	100 kB	🟢 1.26 kB (-1%)
index.pack.old gzip	103 kB	101 kB	🟢 1.88 kB (-2%)
Total	3.89 MB	3.9 MB	⚠️ +3.51 kB

🔄 Shared (bundler-independent)

Runtimes

	Canary	PR	Change
app-page-exp...dev.js gzip	305 kB	305 kB	✓
app-page-exp..prod.js gzip	162 kB	162 kB	✓
app-page-tur...dev.js gzip	305 kB	305 kB	✓
app-page-tur..prod.js gzip	162 kB	162 kB	✓
app-page-tur...dev.js gzip	302 kB	302 kB	✓
app-page-tur..prod.js gzip	160 kB	160 kB	✓
app-page.run...dev.js gzip	302 kB	302 kB	✓
app-page.run..prod.js gzip	160 kB	160 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	47.4 kB	47.4 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	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	✓
pages-turbo....dev.js gzip	50.8 kB	50.8 kB	✓
pages-turbo...prod.js gzip	38.2 kB	38.2 kB	✓
pages.runtim...dev.js gzip	50.8 kB	50.8 kB	✓
pages.runtim..prod.js gzip	38.2 kB	38.2 kB	✓
server.runti..prod.js gzip	62.2 kB	62.2 kB	✓
Total	2.71 MB	2.71 MB	✅ -43 B

📝 Changed Files (9 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
app-route-tu..time.prod.js
app-route.ru..time.prod.js
pages-api-tu..time.prod.js
pages-turbo...time.prod.js
server.runtime.prod.js

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app-page-exp..ntime.dev.js

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app-page-tur..ntime.dev.js

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app-page-tur..ntime.dev.js

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app-page.runtime.dev.js

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app-route-tu..time.prod.js

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app-route.ru..time.prod.js

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pages-api-tu..time.prod.js

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pages-turbo...time.prod.js

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server.runtime.prod.js

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eps1lon · 2026-01-22T18:42:58Z

Nothing interesting in here

nextjs-bot added 6 commits January 22, 2026 16:25

Update react@experimental

b7ebbe3

Update react

47cb76c

Updated peer dependency references in apps

b9cc813

Updated peer dependency references in libraries

eb9a5d7

Update lockfile

94a28e6

ncc-compiled

6003f69

nextjs-bot assigned eps1lon Jan 22, 2026

nextjs-bot requested a review from eps1lon January 22, 2026 16:27

nextjs-bot added type: react-sync CI approved Approve running CI for fork type: next labels Jan 22, 2026

eps1lon closed this Jan 22, 2026

eps1lon deleted the update/react/19.3.0-canary-6a0ab4d2-20260121 branch January 22, 2026 18:43

eps1lon restored the update/react/19.3.0-canary-6a0ab4d2-20260121 branch January 22, 2026 18:43

eps1lon deleted the update/react/19.3.0-canary-6a0ab4d2-20260121 branch January 24, 2026 00:24

github-actions bot added the locked label Feb 7, 2026

github-actions bot locked as resolved and limited conversation to collaborators Feb 7, 2026

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Upgrade React from `b546603b-20260121` to `6a0ab4d2-20260121`#88902

Upgrade React from `b546603b-20260121` to `6a0ab4d2-20260121`#88902
nextjs-bot wants to merge 6 commits intocanaryfrom
update/react/19.3.0-canary-6a0ab4d2-20260121

nextjs-bot commented Jan 22, 2026

Uh oh!

nextjs-bot commented Jan 22, 2026

⚡ Dev Server

📦 Dev Server (Webpack)

⚡ Production Builds

📦 Production Builds (Webpack)

Bundle Sizes

⚡ Turbopack

📦 Webpack

🔄 Shared (bundler-independent)

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eps1lon commented Jan 22, 2026

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nextjs-bot commented Jan 22, 2026

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nextjs-bot commented Jan 22, 2026

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!

eps1lon commented Jan 22, 2026

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