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Remove prefetch from instant config#92761

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Remove prefetch from instant config#92761
gnoff wants to merge 3 commits intocanaryfrom
jstory/remove-prefetch-from-instant

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@gnoff gnoff commented Apr 14, 2026

prefetching is now controlled with the prefetch export and this option is inert on the instant export. this removes the prefetch option as a valid property on the instant config type.

also updates the ts plugin for this export and adds the definition for the previously landed prefetch export

@nextjs-bot nextjs-bot added created-by: Next.js team PRs by the Next.js team. tests Turbopack Related to Turbopack with Next.js. type: next labels Apr 14, 2026
@gnoff gnoff requested review from acdlite and lubieowoce April 14, 2026 00:47
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nextjs-bot commented Apr 14, 2026

Failing test suites

Commit: e6e1d3b | About building and testing Next.js

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nextjs-bot commented Apr 14, 2026

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) 457ms 456ms ▁█▁▁▁
Cold (Ready in log) 444ms 443ms ▁▅▅▃▄
Cold (First Request) 1.128s 1.121s █▁▁█▁
Warm (Listen) 457ms 456ms █▁▁▁▁
Warm (Ready in log) 440ms 441ms ▄▃▂▆▂
Warm (First Request) 352ms 352ms ▁▃▂▆▄
📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric Canary PR Change Trend
Cold (Listen) 456ms 456ms ▁▅▅▁▅
Cold (Ready in log) 436ms 436ms ▂▁█▁▁
Cold (First Request) 1.930s 1.939s ▆▁█▁▄
Warm (Listen) 456ms 456ms ▃▁▃▃▃
Warm (Ready in log) 437ms 436ms ▃▁█▂▁
Warm (First Request) 1.943s 1.944s ▄▁█▁▃

⚡ Production Builds

Metric Canary PR Change Trend
Fresh Build 3.993s 3.914s ▄▅▄▄▆
Cached Build 4.000s 4.017s ▃▅▆▁█
📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric Canary PR Change Trend
Fresh Build 14.392s 14.443s ▂▁█▁▁
Cached Build 14.505s 14.610s ▂▁█▁▁
node_modules Size 493 MB 493 MB ████▁
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Total 7.98 kB 7.97 kB ✅ -10 B

Server

Edge SSR
Canary PR Change
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Total 399 kB 398 kB ✅ -477 B
Middleware
Canary PR Change
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Total 4.61 MB 4.6 MB ✅ -8.7 kB

🔄 Shared (bundler-independent)

Runtimes
Canary PR Change
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app-page-exp..prod.js gzip 192 kB 192 kB
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pages-api.ru..prod.js gzip 33.5 kB 33.5 kB
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server.runti..prod.js gzip 62.9 kB 62.9 kB
Total 3.06 MB 3.06 MB ⚠️ +139 B
📝 Changed Files (8 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
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app-page-tur..ntime.dev.js
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📎 Tarball URL
https://vercel-packages.vercel.app/next/commits/e6e1d3b5d67f6f5c9952981a4e81a97c84ff7747/next

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codspeed-hq bot commented Apr 14, 2026

Merging this PR will improve performance by 3.24%

⚡ 1 improved benchmark
✅ 16 untouched benchmarks
⏩ 3 skipped benchmarks1

Performance Changes

Mode Benchmark BASE HEAD Efficiency
Simulation packages-bundle.js[full] 1,020.4 ms 988.4 ms +3.24%

Comparing jstory/remove-prefetch-from-instant (e6e1d3b) with canary (54e44b4)

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.

Base automatically changed from jstory/add-unstable-prefetch-config to canary April 14, 2026 14:58
gnoff added 2 commits April 14, 2026 08:22
prefetching is now controlled with the prefetch export and this option is inert on the instant export. this removes the prefetch option as a valid property on the instant config type.
@gnoff gnoff force-pushed the jstory/remove-prefetch-from-instant branch from 7bc6d8c to b048604 Compare April 14, 2026 15:22
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Additional Suggestion:

TypeScript plugin autocomplete for unstable_instant suggests { prefetch: "static" } which is rejected by the strict Zod schema that no longer includes a prefetch property, and the type hint is missing true as a valid value.

Fix on Vercel

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