Upgrade React from `4a3d993e-20260114` to `bef88f7c-20260116` #88649

nextjs-bot · 2026-01-16T16:24:06Z

diff facebook/[email protected]

React upstream changes

[DevTools] Stop setting unused global variables facebook/react#35532
[DevTools] Clear element inspection if host element not owned by any renderer is selected facebook/react#35504
Typecheck React DevTools extension main script facebook/react#35519
[Fiber] Instrument the lazy initializer thenable in all cases facebook/react#35521
Optimize gesture by allowing the original work in progress tree to be a suspended commit facebook/react#35510
Defer useDeferredValue updates in Gestures facebook/react#35511
Entangle Gesture revert commit with the corresponding Action commit facebook/react#35487
Commit the Gesture lane if a gesture ends closer to the target state facebook/react#35486
[Fiber] fix useId tracking on replay facebook/react#35518
[DevTools] Show fallback in inspected element pane when no element is selected facebook/react#35503
[DevTools] Add React Element pane to browser Elements panel facebook/react#35240
Improve the detection of changed hooks facebook/react#35123

Closes #84029

nextjs-bot · 2026-01-16T16:40:19Z

Tests Passed

nextjs-bot · 2026-01-16T16:43:10Z

Stats from current PR

🔴 1 regression

Metric	Canary	PR	Change	Trend
node_modules Size	458 MB	458 MB	🔴 +74.9 kB (+0%)	▁▁███

📊 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)	439ms	439ms	✓	▂█▂▂▂
Cold (First Request)	1.252s	1.201s	✓	▄█▄▄▄
Warm (Listen)	456ms	456ms	✓	▁█▁▁▁
Warm (Ready in log)	444ms	442ms	✓	▁█▁▁▁
Warm (First Request)	345ms	345ms	✓	▁█▂▁▁

📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric	Canary	PR	Change	Trend
Cold (Listen)	508ms	507ms	✓	▁█▁▁▁
Cold (Ready in log)	472ms	470ms	✓	▇▁▇█▆
Cold (First Request)	1.940s	1.919s	✓	█▂▇▇▇
Warm (Listen)	508ms	508ms	✓	█▅▁▅▅
Warm (Ready in log)	466ms	470ms	✓	▇▁▇█▇
Warm (First Request)	1.960s	1.926s	✓	█▁▇█▇

⚡ Production Builds

Metric	Canary	PR	Change	Trend
Fresh Build	4.415s	4.441s	✓	▁█▁▁▁
Cached Build	4.322s	4.283s	✓	▁█▁▁▁

📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric	Canary	PR	Change	Trend
Fresh Build	15.017s	15.047s	✓	▅█▁▂▅
Cached Build	15.239s	15.132s	✓	██▂▃▇
node_modules Size	458 MB	458 MB	🔴 +74.9 kB (+0%)	▁▁███

📦 Bundle Sizes

Bundle Sizes

⚡ Turbopack

Client

Main Bundles: **430 kB** → **430 kB** ✅ -46 B

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

Server

Middleware

	Canary	PR	Change
middleware-b..fest.js gzip	787 B	790 B	✓
Total	787 B	790 B	⚠️ +3 B

Build Details

Build Manifests

	Canary	PR	Change
_buildManifest.js gzip	452 B	451 B	✓
Total	452 B	451 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	52.3 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	251 B	253 B	✓
main-HASH.js gzip	38.6 kB	38.9 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	51.9 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	225 kB	225 kB	⚠️ +23 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	242 kB	237 kB	🟢 4.8 kB (-2%)
Total	366 kB	362 kB	✅ -4.79 kB

Middleware

	Canary	PR	Change
middleware-b..fest.js gzip	652 B	653 B	✓
middleware-r..fest.js gzip	155 B	156 B	✓
middleware.js gzip	33.1 kB	33.4 kB	✓
edge-runtime..pack.js gzip	842 B	842 B	✓
Total	34.8 kB	35 kB	⚠️ +245 B

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	3.66 MB	3.67 MB	🔴 +8.98 kB (+0%)
index.pack gzip	100 kB	97.5 kB	🟢 2.6 kB (-3%)
index.pack.old gzip	99.3 kB	99 kB	✓
Total	3.86 MB	3.86 MB	⚠️ +6.1 kB

🔄 Shared (bundler-independent)

Runtimes

	Canary	PR	Change
app-page-exp...dev.js gzip	304 kB	304 kB	✓
app-page-exp..prod.js gzip	158 kB	158 kB	✓
app-page-tur...dev.js gzip	304 kB	304 kB	✓
app-page-tur..prod.js gzip	158 kB	158 kB	✓
app-page-tur...dev.js gzip	300 kB	300 kB	✓
app-page-tur..prod.js gzip	156 kB	156 kB	✓
app-page.run...dev.js gzip	300 kB	300 kB	✓
app-page.run..prod.js gzip	156 kB	156 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	47.3 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	50.7 kB	50.7 kB	✓
pages.runtim..prod.js gzip	38.2 kB	38.2 kB	✓
server.runti..prod.js gzip	62.2 kB	62.2 kB	✓
Total	2.69 MB	2.69 MB	⚠️ +245 B

📝 Changed Files (15 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..time.prod.js
app-route-tu..time.prod.js
app-route-tu..time.prod.js
app-route.ru..time.prod.js
server.runtime.prod.js
pages-api-tu..ntime.dev.js
pages-turbo...ntime.dev.js

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server.runtime.prod.js

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pages-api-tu..ntime.dev.js

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pages-turbo...ntime.dev.js

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

Update react@experimental

ca9ba54

Update react

5562c4c

Updated peer dependency references in apps

6775c45

Updated peer dependency references in libraries

48b94cc

Update lockfile

9e0eb89

ncc-compiled

d670518

nextjs-bot assigned eps1lon Jan 16, 2026

nextjs-bot requested a review from eps1lon January 16, 2026 16:24

nextjs-bot added type: react-sync CI approved Approve running CI for fork type: next labels Jan 16, 2026

eps1lon approved these changes Jan 16, 2026

View reviewed changes

eps1lon marked this pull request as draft January 16, 2026 16:28

eps1lon marked this pull request as ready for review January 16, 2026 16:37

eps1lon enabled auto-merge (squash) January 16, 2026 16:37

eps1lon merged commit 52b2a9c into canary Jan 16, 2026
414 of 418 checks passed

eps1lon deleted the update/react/19.3.0-canary-bef88f7c-20260116 branch January 16, 2026 17:13

wyattjoh pushed a commit that referenced this pull request Jan 16, 2026

Upgrade React from 4a3d993e-20260114 to bef88f7c-20260116 (#88649)

380b340

doodirock mentioned this pull request Jan 17, 2026

feat: next.js 16 support payloadcms/payload#14456

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Upgrade React from `4a3d993e-20260114` to `bef88f7c-20260116` #88649

Upgrade React from `4a3d993e-20260114` to `bef88f7c-20260116` #88649

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Upgrade React from 4a3d993e-20260114 to bef88f7c-20260116 #88649

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nextjs-bot commented Jan 16, 2026

Stats from current PR

🔴 1 regression

⚡ Dev Server

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⚡ Production Builds

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Upgrade React from `4a3d993e-20260114` to `bef88f7c-20260116` #88649

Upgrade React from `4a3d993e-20260114` to `bef88f7c-20260116` #88649

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