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[backport] Fix CSS HMR on Safari#92174

Merged
lukesandberg merged 3 commits intonext-16-2from
backport/92123-to-16-2
Mar 31, 2026
Merged

[backport] Fix CSS HMR on Safari#92174
lukesandberg merged 3 commits intonext-16-2from
backport/92123-to-16-2

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Summary

Test plan

  • UPDATE=1 cargo nextest r -p turbopack-tests — all 297 tests pass
  • pnpm build-all — clean build, no issues with generated-native.d.ts

@nextjs-bot nextjs-bot added created-by: Turbopack team PRs by the Turbopack team. Turbopack Related to Turbopack with Next.js. type: next labels Mar 31, 2026
lukesandberg and others added 3 commits March 31, 2026 14:59
Fixes #91818

**Regression source:** Commit `b7e4c6a011` ("Turbopack: transpile
CHUNK_SUFFIX") introduced `getChunkSuffixFromScriptSrc()` which reads
query strings from `<script>` tags. On Safari, this picks up the `?ts=`
param injected by the server-side cache-busting workaround in
`render.tsx` (for [WebKit
into `ASSET_SUFFIX`. This causes HMR CSS URLs to match the preloaded URL
exactly, re-triggering the Safari preload cache bug and preventing style
updates.

**Changes:**

- **`dev-backend-dom.ts`**: Match existing `<link>` elements by base
path (strip query string) so selectors work across HMR updates with
different `?ts=` values. Add Safari to the Firefox cache-busting branch
so new stylesheet links always get a fresh `?ts=`.
- **`hmr-client.ts`**: Fix `mergeChunkUpdates` so a `total` update
always supersedes any prior update type.

(cherry picked from commit 8be5a3c)
@lukesandberg lukesandberg marked this pull request as ready for review March 31, 2026 21:59
@lukesandberg lukesandberg force-pushed the backport/92123-to-16-2 branch from bc422ce to 83064d3 Compare March 31, 2026 21:59
@lukesandberg lukesandberg merged commit 1a319ea into next-16-2 Mar 31, 2026
130 of 136 checks passed
@lukesandberg lukesandberg deleted the backport/92123-to-16-2 branch March 31, 2026 22:05
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nextjs-bot commented Mar 31, 2026

Failing test suites

Commit: 83064d3 | About building and testing Next.js

pnpm test-dev-turbo test/development/pages-dir/client-navigation/url-hash.test.ts (turbopack) (job)

  • Client navigation with URL hash > when hash changes with state > when passing state via hash change > should increment the shallow history state counter (DD)
Expand output

● Client navigation with URL hash › when hash changes with state › when passing state via hash change › should increment the shallow history state counter

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

Expected: "SHALLOW HISTORY COUNT: 2"
Received: "SHALLOW HISTORY COUNT: 1"

  253 |           .text()
  254 |
> 255 |         expect(historyCount).toBe('SHALLOW HISTORY COUNT: 2')
      |                              ^
  256 |
  257 |         const counter = await browser.elementByCss('p').text()
  258 |

  at Object.toBe (development/pages-dir/client-navigation/url-hash.test.ts:255:30)

pnpm test-start test/e2e/app-dir/segment-cache/prefetch-layout-sharing/prefetch-layout-sharing.test.ts (job)

  • layout sharing in non-static prefetches > full prefetches should omit layouts that were already prefetched with a full prefetch (DD)
  • layout sharing in non-static prefetches > navigations should omit layouts that were already prefetched with a full prefetch (DD)
  • layout sharing in non-static prefetches > segment-level prefetch config > statically prefetches a fully-static page segment if all its runtime-prefetchable parents are available (DD)
Expand output

● layout sharing in non-static prefetches › full prefetches should omit layouts that were already prefetched with a full prefetch

thrown: "Exceeded timeout of 60000 ms for a test.
Add a timeout value to this test to increase the timeout, if this is a long-running test. See https://jestjs.io/docs/api#testname-fn-timeout."

  50 |       }
  51 |
> 52 |       const result = Reflect.apply(target, thisArg, args)
     |                              ^
  53 |       return typeof result === 'function' ? wrapJestTestFn(result) : result
  54 |     },
  55 |     get(target, prop, receiver) {

  at Object.apply (lib/e2e-utils/index.ts:52:30)
  at it (e2e/app-dir/segment-cache/prefetch-layout-sharing/prefetch-layout-sharing.test.ts:121:3)
  at Object.describe (e2e/app-dir/segment-cache/prefetch-layout-sharing/prefetch-layout-sharing.test.ts:6:1)

● layout sharing in non-static prefetches › navigations should omit layouts that were already prefetched with a full prefetch

thrown: "Exceeded timeout of 60000 ms for a test.
Add a timeout value to this test to increase the timeout, if this is a long-running test. See https://jestjs.io/docs/api#testname-fn-timeout."

  50 |       }
  51 |
> 52 |       const result = Reflect.apply(target, thisArg, args)
     |                              ^
  53 |       return typeof result === 'function' ? wrapJestTestFn(result) : result
  54 |     },
  55 |     get(target, prop, receiver) {

  at Object.apply (lib/e2e-utils/index.ts:52:30)
  at it (e2e/app-dir/segment-cache/prefetch-layout-sharing/prefetch-layout-sharing.test.ts:184:3)
  at Object.describe (e2e/app-dir/segment-cache/prefetch-layout-sharing/prefetch-layout-sharing.test.ts:6:1)

● layout sharing in non-static prefetches › segment-level prefetch config › statically prefetches a fully-static page segment if all its runtime-prefetchable parents are available

thrown: "Exceeded timeout of 60000 ms for a test.
Add a timeout value to this test to increase the timeout, if this is a long-running test. See https://jestjs.io/docs/api#testname-fn-timeout."

  50 |       }
  51 |
> 52 |       const result = Reflect.apply(target, thisArg, args)
     |                              ^
  53 |       return typeof result === 'function' ? wrapJestTestFn(result) : result
  54 |     },
  55 |     get(target, prop, receiver) {

  at Object.apply (lib/e2e-utils/index.ts:52:30)
  at it (e2e/app-dir/segment-cache/prefetch-layout-sharing/prefetch-layout-sharing.test.ts:649:5)
  at describe (e2e/app-dir/segment-cache/prefetch-layout-sharing/prefetch-layout-sharing.test.ts:584:3)
  at Object.describe (e2e/app-dir/segment-cache/prefetch-layout-sharing/prefetch-layout-sharing.test.ts:6:1)

pnpm test-start-turbo test/e2e/css-data-url-global-pages/css-data-url-global-pages.test.ts (turbopack) (job)

  • css-data-url-global-pages > should apply styles from data url correctly (DD)
Expand output

● css-data-url-global-pages › should apply styles from data url correctly

next build failed with code/signal 1

   97 |             if (code || signal)
   98 |               reject(
>  99 |                 new Error(
      |                 ^
  100 |                   `next build failed with code/signal ${code || signal}`
  101 |                 )
  102 |               )

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:99:17)

pnpm test-dev test/e2e/app-dir/use-cache/use-cache.test.ts (job)

  • use-cache > should revalidate caches during on-demand revalidation (DD)
Expand output

● use-cache › should revalidate caches during on-demand revalidation

page.waitForSelector: Timeout 10000ms exceeded.
Call log:
  - waiting for locator('#revalidate-api-route:enabled') to be visible

  545 |
  546 |     return this.startChain(async () => {
> 547 |       const el = await page.waitForSelector(selector, {
      |                             ^
  548 |         timeout,
  549 |         state,
  550 |       })

  at waitForSelector (lib/browsers/playwright.ts:547:29)
  at Playwright._chain (lib/browsers/playwright.ts:677:23)
  at Playwright._chain [as startChain] (lib/browsers/playwright.ts:658:17)
  at Playwright.startChain [as waitForElementByCss] (lib/browsers/playwright.ts:546:17)
  at Object.waitForElementByCss (e2e/app-dir/use-cache/use-cache.test.ts:396:19)

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Stats from current PR

🟢 1 improvement

Metric Canary PR Change Trend
node_modules Size 485 MB 484 MB 🟢 1.57 MB (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) 456ms 456ms ▁▁▁▁█
Cold (Ready in log) 444ms 443ms ▁▁▁▁█
Cold (First Request) 1.093s 1.162s ▁▁▁▁█
Warm (Listen) 458ms 457ms ▁▁▁▁█
Warm (Ready in log) 448ms 447ms ▁▁▁▁█
Warm (First Request) 347ms 354ms ▁▁▁▁█
📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric Canary PR Change Trend
Cold (Listen) 455ms 456ms ▁▅▅█▅
Cold (Ready in log) 438ms 438ms ▂▁▁▄▁
Cold (First Request) 1.947s 1.958s ▄▂▅▅▄
Warm (Listen) 457ms 456ms ▃▃▃▁▁
Warm (Ready in log) 441ms 438ms ▁▁▁▂▁
Warm (First Request) 1.973s 1.955s ▅▂▆▄▄

⚡ Production Builds

Metric Canary PR Change Trend
Fresh Build 3.806s 3.894s ▁▁▁▁█
Cached Build 3.827s 3.844s ▁▁▁▁█
📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric Canary PR Change Trend
Fresh Build 14.407s 14.409s ▂▁▂▃▁
Cached Build 14.602s 14.623s ▁▁▂▃▁
node_modules Size 485 MB 484 MB 🟢 1.57 MB (0%) █████
📦 Bundle Sizes

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🔄 Shared (bundler-independent)

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📝 Changed Files (25 files)

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  • app-page-exp..ntime.dev.js
  • app-page-exp..time.prod.js
  • app-page-tur..ntime.dev.js
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  • pages-api-tu..ntime.dev.js
  • pages-api-tu..time.prod.js
  • pages-api.runtime.dev.js
  • pages-api.ru..time.prod.js
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📎 Tarball URL
https://vercel-packages.vercel.app/next/commits/83064d31b0c75bdd2ff6b12b0b5ceac6a1bc46be/next

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codspeed-hq bot commented Mar 31, 2026

Merging this PR will degrade performance by 5.04%

⚡ 1 improved benchmark
❌ 1 regressed benchmark
✅ 15 untouched benchmarks
⏩ 3 skipped benchmarks1

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

Mode Benchmark BASE HEAD Efficiency
Simulation build[lucide-react-all] 6.5 s 6.2 s +6.18%
Simulation jsonwebtoken.js[full] 276.2 ms 290.8 ms -5.04%

Comparing backport/92123-to-16-2 (83064d3) with canary (8be5a3c)2

Open in CodSpeed

Footnotes

  1. 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.

  2. No successful run was found on next-16-2 (c4779d1) during the generation of this report, so canary (8be5a3c) was used instead as the comparison base. There might be some changes unrelated to this pull request in this report.

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