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partial fallbacks: add adapter flag#90395

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ztanner merged 1 commit intocanaryfrom
02-23-partial_fallbacks_add_adapter_flag_tweak_allowquery
Mar 4, 2026
Merged

partial fallbacks: add adapter flag#90395
ztanner merged 1 commit intocanaryfrom
02-23-partial_fallbacks_add_adapter_flag_tweak_allowquery

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@ztanner ztanner commented Feb 23, 2026 •
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Plumbs the new partialFallback through onBuildComplete, which is consumed by adapter-vercel to signal that a prerender is a partial fallback (PR forthcoming, once this lands, so it's available on the types). For more information on what a partial fallback is, see the downstack PR.

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Stats from current PR

✅ No significant changes detected

📊 All Metrics
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Dev Server Metrics:

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  • Warm = With cached build artifacts

Build Metrics:

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Change Thresholds:

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  • All other changes are flagged to catch regressions

⚡ Dev Server

Metric Canary PR Change Trend
Cold (Listen) 506ms 457ms ✓ ▁▁▁▁▁
Cold (Ready in log) 462ms 459ms ✓ ▂▂▁▁▂
Cold (First Request) 892ms 926ms ✓ ▄▄▁▁▄
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Warm (First Request) 370ms 332ms ✓ ▁▂▂▁▂
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📦 Dev Server (Webpack)

Metric Canary PR Change Trend
Cold (Listen) 458ms 505ms ✓ ▁▁▁▁▁
Cold (Ready in log) 461ms 459ms ✓ ▁▁▁▁▁
Cold (First Request) 2.068s 2.063s ✓ ▁▁▁▁▁
Warm (Listen) 457ms 506ms ✓ ▁▁▁▁▁
Warm (Ready in log) 459ms 462ms ✓ ▁▁▁▁▁
Warm (First Request) 2.082s 2.063s ✓ ▁▁▁▁▁

⚡ Production Builds

Metric Canary PR Change Trend
Fresh Build 4.302s 4.245s ✓ ▁▁▁▁▁
Cached Build 4.349s 4.330s ✓ ▁▁▁▁▁
📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric Canary PR Change Trend
Fresh Build 14.684s 14.735s ✓ ▄▁▃▁▁
Cached Build 14.797s 14.750s ✓ ▃▁▃▁▁
node_modules Size 474 MB 474 MB ✓ █████
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Bundle Sizes

⚡ Turbopack

Client

Main Bundles: **399 kB** → **399 kB** ✅ -8 B

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

Server

Middleware
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middleware-b..fest.js gzip 766 B 761 B ✓
Total 766 B 761 B ✅ -5 B
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Total 448 B 451 B ⚠️ +3 B

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Total 39.4 kB 39.4 kB ✓
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_app-HASH.js gzip 194 B 194 B ✓
_error-HASH.js gzip 183 B 180 B 🟢 3 B (-2%)
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Server

Edge SSR
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edge-ssr.js gzip 125 kB 125 kB ✓
page.js gzip 253 kB 253 kB ✓
Total 377 kB 378 kB ⚠️ +669 B
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middleware-b..fest.js gzip 617 B 615 B ✓
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middleware.js gzip 43.8 kB 43.9 kB ✓
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Build Details
Build Manifests
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_buildManifest.js gzip 715 B 718 B ✓
Total 715 B 718 B ⚠️ +3 B
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0.pack gzip 3.99 MB 4.01 MB 🔴 +13.6 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 (25 files)

Files with changes:

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  • app-page-exp..time.prod.js
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  • pages-api-tu..ntime.dev.js
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📎 Tarball URL 
next@https://vercel-packages.vercel.app/next/prs/90395/next

@ztanner ztanner force-pushed the 01-26-re-introduce_partial_fallback_-_route_upgrading branch from 3c112e2 to b849252 Compare February 25, 2026 19:25
@ztanner ztanner force-pushed the 02-23-partial_fallbacks_add_adapter_flag_tweak_allowquery branch from 161d5d5 to d6f451b Compare February 25, 2026 19:25
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Additional Suggestion:

Segment prerenders incorrectly inherit partialFallback: true from initialOutput.config when created for dynamic routes with partial fallback enabled.

Fix on Vercel

@ztanner ztanner force-pushed the 02-23-partial_fallbacks_add_adapter_flag_tweak_allowquery branch from d6f451b to e3957e3 Compare February 25, 2026 22:00
@ztanner ztanner changed the base branch from 01-26-re-introduce_partial_fallback_-_route_upgrading to graphite-base/90395 March 4, 2026 20:10
@ztanner ztanner force-pushed the 02-23-partial_fallbacks_add_adapter_flag_tweak_allowquery branch from e3957e3 to 22e217d Compare March 4, 2026 20:10
@ztanner ztanner force-pushed the graphite-base/90395 branch from b849252 to 8bd3a2a Compare March 4, 2026 20:10
@ztanner ztanner changed the base branch from graphite-base/90395 to canary March 4, 2026 20:11
@ztanner ztanner changed the title partial fallbacks: add adapter flag & tweak allowQuery partial fallbacks: add adapter flag Mar 4, 2026
@ztanner ztanner force-pushed the 02-23-partial_fallbacks_add_adapter_flag_tweak_allowquery branch from 22e217d to 26b2e69 Compare March 4, 2026 20:27
@ztanner ztanner mentioned this pull request Mar 4, 2026
Merged
@ztanner ztanner marked this pull request as ready for review March 4, 2026 21:06
@ztanner ztanner requested a review from ijjk March 4, 2026 21:06
@ztanner ztanner merged commit 1c9577e into canary Mar 4, 2026
281 of 284 checks passed
@ztanner ztanner deleted the 02-23-partial_fallbacks_add_adapter_flag_tweak_allowquery branch March 4, 2026 21:22
@ijjk ijjk mentioned this pull request Mar 4, 2026
Merged
sokra pushed a commit that referenced this pull request Mar 6, 2026
@ztanner @sokra
partial fallbacks: add adapter flag (#90395)
2dbfe80 
Plumbs the new `partialFallback` through `onBuildComplete`, which is
consumed by `adapter-vercel` to signal that a prerender is a partial
fallback (PR forthcoming, once this lands, so it's available on the
types). For more information on what a partial fallback is, see the
downstack PR.
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