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segment cache: add test for passing unawaited promise to context provider#89339

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01-31-add_failing_test_for_unresolved_prefetch_promises
Feb 21, 2026
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segment cache: add test for passing unawaited promise to context provider#89339
ztanner merged 1 commit intocanaryfrom
01-31-add_failing_test_for_unresolved_prefetch_promises

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@ztanner ztanner commented Jan 31, 2026 •
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Adds a failing test proving that if the RSC response from a prefetch contains an unresolved promise, navigating to the page will cause the Suspense boundary wrapping the use of that promise to remain in fallback state indefinitely.

This appears to have regressed in e9a03ac, though the theory is that this is just uncovering a React bug rather than causing the issue.

Fixed via facebook/react#35839

Closes #89170

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Stats from current PR

✅ No significant changes detected

📊 All Metrics
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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) 507ms 507ms ✓ ▁█▁█▂
Cold (Ready in log) 484ms 483ms ✓ ▁█▁█▃
Cold (First Request) 1.049s 1.042s ✓ ▁█▄█▄
Warm (Listen) 508ms 508ms ✓ ▁█▁█▂
Warm (Ready in log) 480ms 479ms ✓ ▁█▁█▃
Warm (First Request) 375ms 380ms ✓ ▁█▁█▃
📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric Canary PR Change Trend
Cold (Listen) 456ms 457ms ✓ ▁▁▁▁▁
Cold (Ready in log) 453ms 453ms ✓ ▁▃▁▁▃
Cold (First Request) 2.102s 2.062s ✓ ▁▁▁▁▃
Warm (Listen) 456ms 456ms ✓ ▁▁▁▁▁
Warm (Ready in log) 452ms 453ms ✓ ▁▂▁▁▂
Warm (First Request) 2.077s 2.065s ✓ ▁▁▁▁▃

⚡ Production Builds

Metric Canary PR Change Trend
Fresh Build 4.741s 4.735s ✓ ▁█▁▇▅
Cached Build 4.664s 4.730s ✓ ▁█▁█▅
📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric Canary PR Change Trend
Fresh Build 14.963s 14.948s ✓ ▁▁▁▁▄
Cached Build 15.039s 14.984s ✓ ▁▁▁▁▄
node_modules Size 474 MB 474 MB ✓ ▁▁▁▁▁
📦 Bundle Sizes

Bundle Sizes

⚡ Turbopack

Client

Main Bundles: **399 kB** → **399 kB** ✅ -5 B

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

Server

Middleware
Canary PR Change
middleware-b..fest.js gzip 768 B 763 B ✓
Total 768 B 763 B ✅ -5 B
Build Details
Build Manifests
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📦 Webpack

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5528-HASH.js gzip 5.48 kB N/A -
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Pages
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Canary PR Change
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Total 377 kB 378 kB ⚠️ +276 B
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Canary PR Change
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Canary PR Change
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Total 715 B 718 B ⚠️ +3 B
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Canary PR Change
0.pack gzip 3.96 MB 3.97 MB 🔴 +6.96 kB (+0%)
index.pack gzip 103 kB 103 kB ✓
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🔄 Shared (bundler-independent)

Runtimes
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app-page-exp...dev.js gzip 318 kB 318 kB ✓
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📝 Changed Files (4 files)

Files with changes:

  • pages-api-tu..time.prod.js
  • pages-api.runtime.dev.js
  • pages-turbo...time.prod.js
  • pages.runtime.dev.js
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@ztanner ztanner mentioned this pull request Jan 31, 2026
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@ztanner ztanner force-pushed the 01-31-add_failing_test_for_unresolved_prefetch_promises branch from bc1adb2 to e0c8338 Compare February 17, 2026 00:24
@ztanner ztanner changed the title add failing test for unresolved prefetch promises segment cache: keep descendant PPR cache nodes deferred under pending parent Feb 17, 2026
@ztanner ztanner force-pushed the 01-31-add_failing_test_for_unresolved_prefetch_promises branch from e0c8338 to ece5534 Compare February 17, 2026 01:13
@ztanner ztanner changed the title segment cache: keep descendant PPR cache nodes deferred under pending parent segment cache: add failing test for unresolved prefetch promises Feb 17, 2026
@eps1lon eps1lon force-pushed the 01-31-add_failing_test_for_unresolved_prefetch_promises branch from ece5534 to 1308c99 Compare February 21, 2026 17:57
@ztanner ztanner marked this pull request as ready for review February 21, 2026 18:25
@ztanner ztanner changed the title segment cache: add failing test for unresolved prefetch promises segment cache: add test for passing unawaited promise to context provider Feb 21, 2026
@ztanner ztanner enabled auto-merge (squash) February 21, 2026 18:26
@ztanner ztanner requested a review from eps1lon February 21, 2026 18:28
@ztanner ztanner merged commit fd38d5b into canary Feb 21, 2026
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@ztanner ztanner deleted the 01-31-add_failing_test_for_unresolved_prefetch_promises branch February 21, 2026 18:29
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