Change UrlBehavior.static_suffix to ResolvedVc<Option<RcStr>> by lukesandberg · Pull Request #89921 · vercel/next.js

lukesandberg · 2026-02-12T16:56:03Z

Summary

Changes UrlBehavior.static_suffix from Option<RcStr> to ResolvedVc<Option<RcStr>> so that css_url_suffix stays as a Vc longer instead of being eagerly resolved at the call site. This improves caching behavior by keeping the value cell-based through the chunking context construction.

Updated UrlBehavior struct definition in turbopack-core
Updated default fallbacks in browser/nodejs chunking contexts
Updated CSS url reference consumer to .await? the ResolvedVc
Replaced .owned().await? with .to_resolved().await? in next-core callers

lukesandberg · 2026-02-12T16:56:17Z

Change UrlBehavior.static_suffix to ResolvedVc<Option<RcStr>> #89921 👈 (View in Graphite)
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nextjs-bot · 2026-02-12T17:07:56Z

Tests Passed

Keep css_url_suffix as a Vc longer by storing it as a ResolvedVc in UrlBehavior instead of eagerly resolving it to Option<RcStr>.

codspeed-hq · 2026-02-12T17:10:15Z

Merging this PR will not alter performance

✅ 17 untouched benchmarks
⏩ 3 skipped benchmarks¹

_{Comparing longer_vc (c264db0) with canary (ff63646)}

3 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

nextjs-bot · 2026-02-12T17:31:08Z

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)	508ms	507ms	✓	▁▁▁▁▁
Cold (Ready in log)	471ms	465ms	✓	▁▂▁▂▂
Cold (First Request)	1.222s	1.182s	✓	▄▅▁▄▄
Warm (Listen)	507ms	508ms	✓	▁▁▁▁▁
Warm (Ready in log)	471ms	473ms	✓	▁▁▁▁▁
Warm (First Request)	336ms	337ms	✓	▂▁▁▁▁

📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric	Canary	PR	Change	Trend
Cold (Listen)	456ms	456ms	✓	▁▁▁█▁
Cold (Ready in log)	435ms	435ms	✓	▃▃▁█▅
Cold (First Request)	1.745s	1.757s	✓	▂▂▁█▃
Warm (Listen)	456ms	457ms	✓	▁▁▁█▁
Warm (Ready in log)	436ms	434ms	✓	▃▃▁█▄
Warm (First Request)	1.752s	1.766s	✓	▂▂▁█▃

⚡ Production Builds

Metric	Canary	PR	Change	Trend
Fresh Build	4.190s	4.173s	✓	▁▁▂▁▁
Cached Build	4.169s	4.217s	✓	▁▁▂▁▁

📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric	Canary	PR	Change	Trend
Fresh Build	13.734s	13.745s	✓	▁▁▁█▂
Cached Build	13.793s	13.855s	✓	▁▁▁█▂
node_modules Size	472 MB	472 MB	✓	█████

📦 Bundle Sizes

Bundle Sizes

⚡ Turbopack

Client

Main Bundles: **437 kB** → **437 kB** ✅ -2 B

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

Server

Middleware

	Canary	PR	Change
middleware-b..fest.js gzip	765 B	761 B	✓
Total	765 B	761 B	✅ -4 B

Build Details

Build Manifests

	Canary	PR	Change
_buildManifest.js gzip	448 B	451 B	✓
Total	448 B	451 B	⚠️ +3 B

📦 Webpack

Client

Main Bundles

	Canary	PR	Change
5528-HASH.js gzip	5.47 kB	N/A	-
6280-HASH.js gzip	57 kB	N/A	-
6335.HASH.js gzip	169 B	N/A	-
912-HASH.js gzip	4.53 kB	N/A	-
e8aec2e4-HASH.js gzip	62.5 kB	N/A	-
framework-HASH.js gzip	59.7 kB	59.7 kB	✓
main-app-HASH.js gzip	256 B	254 B	✓
main-HASH.js gzip	39.1 kB	39.1 kB	✓
webpack-HASH.js gzip	1.68 kB	1.68 kB	✓
262-HASH.js gzip	N/A	4.53 kB	-
2889.HASH.js gzip	N/A	169 B	-
5602-HASH.js gzip	N/A	5.49 kB	-
6948ada0-HASH.js gzip	N/A	62.5 kB	-
9544-HASH.js gzip	N/A	57.7 kB	-
Total	230 kB	231 kB	⚠️ +636 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	194 B	✓
_error-HASH.js gzip	183 B	180 B	🟢 3 B (-2%)
css-HASH.js gzip	331 B	330 B	✓
dynamic-HASH.js gzip	1.81 kB	1.81 kB	✓
edge-ssr-HASH.js gzip	256 B	256 B	✓
head-HASH.js gzip	351 B	352 B	✓
hooks-HASH.js gzip	384 B	383 B	✓
image-HASH.js gzip	580 B	581 B	✓
index-HASH.js gzip	260 B	260 B	✓
link-HASH.js gzip	2.49 kB	2.49 kB	✓
routerDirect..HASH.js gzip	320 B	319 B	✓
script-HASH.js gzip	386 B	386 B	✓
withRouter-HASH.js gzip	315 B	315 B	✓
1afbb74e6ecf..834.css gzip	106 B	106 B	✓
Total	7.97 kB	7.97 kB	✅ -1 B

Server

Edge SSR

	Canary	PR	Change
edge-ssr.js gzip	126 kB	126 kB	✓
page.js gzip	249 kB	250 kB	✓
Total	375 kB	376 kB	⚠️ +392 B

Middleware

	Canary	PR	Change
middleware-b..fest.js gzip	614 B	614 B	✓
middleware-r..fest.js gzip	156 B	155 B	✓
middleware.js gzip	33.3 kB	33.2 kB	✓
edge-runtime..pack.js gzip	842 B	842 B	✓
Total	34.9 kB	34.8 kB	✅ -123 B

Build Details

Build Manifests

	Canary	PR	Change
_buildManifest.js gzip	733 B	735 B	✓
Total	733 B	735 B	⚠️ +2 B

Build Cache

	Canary	PR	Change
0.pack gzip	3.84 MB	3.85 MB	🔴 +9.02 kB (+0%)
index.pack gzip	102 kB	104 kB	🔴 +1.9 kB (+2%)
index.pack.old gzip	102 kB	103 kB	✓
Total	4.04 MB	4.05 MB	⚠️ +11.8 kB

🔄 Shared (bundler-independent)

Runtimes

	Canary	PR	Change
app-page-exp...dev.js gzip	316 kB	316 kB	✓
app-page-exp..prod.js gzip	168 kB	168 kB	✓
app-page-tur...dev.js gzip	315 kB	315 kB	✓
app-page-tur..prod.js gzip	167 kB	167 kB	✓
app-page-tur...dev.js gzip	312 kB	312 kB	✓
app-page-tur..prod.js gzip	166 kB	166 kB	✓
app-page.run...dev.js gzip	312 kB	312 kB	✓
app-page.run..prod.js gzip	166 kB	166 kB	✓
app-route-ex...dev.js gzip	70.5 kB	70.5 kB	✓
app-route-ex..prod.js gzip	49 kB	49 kB	✓
app-route-tu...dev.js gzip	70.5 kB	70.5 kB	✓
app-route-tu..prod.js gzip	49 kB	49 kB	✓
app-route-tu...dev.js gzip	70.1 kB	70.1 kB	✓
app-route-tu..prod.js gzip	48.8 kB	48.8 kB	✓
app-route.ru...dev.js gzip	70.1 kB	70.1 kB	✓
app-route.ru..prod.js gzip	48.8 kB	48.8 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	43.2 kB	43.2 kB	✓
pages-api-tu..prod.js gzip	32.9 kB	32.9 kB	✓
pages-api.ru...dev.js gzip	43.2 kB	43.2 kB	✓
pages-api.ru..prod.js gzip	32.8 kB	32.8 kB	✓
pages-turbo....dev.js gzip	52.5 kB	52.5 kB	✓
pages-turbo...prod.js gzip	39.4 kB	39.4 kB	✓
pages.runtim...dev.js gzip	52.5 kB	52.5 kB	✓
pages.runtim..prod.js gzip	39.4 kB	39.4 kB	✓
server.runti..prod.js gzip	62.7 kB	62.7 kB	✓
Total	2.8 MB	2.8 MB	⚠️ +2 B

lukesandberg · 2026-02-12T17:52:38Z

Merge activity

Feb 12, 5:52 PM UTC: @lukesandberg merged this pull request with Graphite.

nextjs-bot added created-by: Turbopack team PRs by the Turbopack team. Turbopack Related to Turbopack with Next.js. labels Feb 12, 2026

lukesandberg marked this pull request as ready for review February 12, 2026 16:56

Change UrlBehavior.static_suffix to ResolvedVc<Option<RcStr>>

c264db0

Keep css_url_suffix as a Vc longer by storing it as a ResolvedVc in UrlBehavior instead of eagerly resolving it to Option<RcStr>.

lukesandberg force-pushed the longer_vc branch from cd88c8d to c264db0 Compare February 12, 2026 17:09

lukesandberg requested a review from a team February 12, 2026 17:09

mischnic approved these changes Feb 12, 2026

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lukesandberg merged commit 1486592 into canary Feb 12, 2026
165 checks passed

lukesandberg deleted the longer_vc branch February 12, 2026 17:52

github-actions Bot added the locked label Feb 27, 2026

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Change UrlBehavior.static_suffix to ResolvedVc<Option<RcStr>>#89921

Change UrlBehavior.static_suffix to ResolvedVc<Option<RcStr>>#89921
lukesandberg merged 1 commit into
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lukesandberg commented Feb 12, 2026 •

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Merging this PR will not alter performance

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nextjs-bot commented Feb 12, 2026

Stats from current PR

✅ No significant changes detected

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