Don't include build id in runtime files if not needed by mischnic · Pull Request #89112 · vercel/next.js

mischnic · 2026-01-27T14:43:01Z

After

we don't need the build id at runtime anymore when a deployment id is available.

Closes PACK-6756

mischnic · 2026-01-27T14:43:18Z

Don't include build id in runtime files if not needed #89112 👈 (View in Graphite)
Replace flight navigation build id field with header #88855 : 1 other dependent PR (#89325 )
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nextjs-bot · 2026-01-27T14:47:29Z

Tests Passed

packages/next/src/server/app-render/app-render.tsx

packages/next/src/server/route-modules/app-route/module.ts

packages/next/src/build/index.ts

nextjs-bot · 2026-01-27T17:38:10Z

Stats from current PR

🔴 1 regression

Metric	Canary	PR	Change	Trend
node_modules Size	464 MB	465 MB	🔴 +173 kB (+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)	457ms	457ms	✓	▁▁▁█▁
Cold (Ready in log)	459ms	459ms	✓	▁▁▂█▁
Cold (First Request)	861ms	866ms	✓	▁▁▂█▁
Warm (Listen)	456ms	457ms	✓	▁▁▁█▁
Warm (Ready in log)	458ms	458ms	✓	▁▁▁█▁
Warm (First Request)	372ms	370ms	✓	▁▁▂█▂

📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric	Canary	PR	Change	Trend
Cold (Listen)	456ms	455ms	✓	███▁█
Cold (Ready in log)	441ms	441ms	✓	██▆▆▇
Cold (First Request)	1.833s	1.839s	✓	▄▄▄▃▅
Warm (Listen)	456ms	456ms	✓	█▅▁▅▅
Warm (Ready in log)	440ms	440ms	✓	▇▆▅▄▅
Warm (First Request)	1.855s	1.844s	✓	▅▄▄▃▅

⚡ Production Builds

Metric	Canary	PR	Change	Trend
Fresh Build	4.200s	4.311s	✓	▁▁▃█▂
Cached Build	4.282s	4.287s	✓	▁▁▃█▂

📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric	Canary	PR	Change	Trend
Fresh Build	13.840s	13.864s	✓	▁▁▂▁▄
Cached Build	13.920s	13.948s	✓	▁▂▂▁▄
node_modules Size	464 MB	465 MB	🔴 +173 kB (+0%)	▁▁▁▁▁

📦 Bundle Sizes

Bundle Sizes

⚡ Turbopack

Client

Main Bundles: **434 kB** → **437 kB** ⚠️ +2.35 kB

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

Server

Middleware

	Canary	PR	Change
middleware-b..fest.js gzip	764 B	764 B	✓
Total	764 B	764 B	✓

Build Details

Build Manifests

	Canary	PR	Change
_buildManifest.js gzip	451 B	451 B	✓
Total	451 B	451 B	✓

📦 Webpack

Client

Main Bundles

	Canary	PR	Change
5528-HASH.js gzip	5.47 kB	N/A	-
6280-HASH.js gzip	54.5 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	255 B	254 B	✓
main-HASH.js gzip	39 kB	39.1 kB	✓
webpack-HASH.js gzip	1.68 kB	1.68 kB	✓
262-HASH.js gzip	N/A	4.52 kB	-
2889.HASH.js gzip	N/A	169 B	-
5602-HASH.js gzip	N/A	5.48 kB	-
6948ada0-HASH.js gzip	N/A	62.5 kB	-
9544-HASH.js gzip	N/A	57.4 kB	-
Total	228 kB	231 kB	⚠️ +2.99 kB

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	248 kB	249 kB	✓
Total	375 kB	375 kB	⚠️ +542 B

Middleware

	Canary	PR	Change
middleware-b..fest.js gzip	615 B	613 B	✓
middleware-r..fest.js gzip	156 B	155 B	✓
middleware.js gzip	32.9 kB	33.2 kB	✓
edge-runtime..pack.js gzip	842 B	842 B	✓
Total	34.5 kB	34.8 kB	⚠️ +254 B

Build Details

Build Manifests

	Canary	PR	Change
_buildManifest.js gzip	732 B	736 B	✓
Total	732 B	736 B	⚠️ +4 B

Build Cache

	Canary	PR	Change
0.pack gzip	3.79 MB	3.83 MB	🔴 +36.4 kB (+1%)
index.pack gzip	103 kB	103 kB	✓
index.pack.old gzip	103 kB	102 kB	🟢 1.93 kB (-2%)
Total	4 MB	4.03 MB	⚠️ +33.8 kB

🔄 Shared (bundler-independent)

Runtimes

	Canary	PR	Change
app-page-exp...dev.js gzip	311 kB	312 kB	✓
app-page-exp..prod.js gzip	166 kB	166 kB	✓
app-page-tur...dev.js gzip	311 kB	311 kB	✓
app-page-tur..prod.js gzip	166 kB	166 kB	✓
app-page-tur...dev.js gzip	308 kB	308 kB	✓
app-page-tur..prod.js gzip	164 kB	164 kB	✓
app-page.run...dev.js gzip	308 kB	308 kB	✓
app-page.run..prod.js gzip	164 kB	164 kB	✓
app-route-ex...dev.js gzip	70.4 kB	70.5 kB	✓
app-route-ex..prod.js gzip	48.9 kB	49 kB	✓
app-route-tu...dev.js gzip	70.4 kB	70.5 kB	✓
app-route-tu..prod.js gzip	49 kB	49 kB	✓
app-route-tu...dev.js gzip	70 kB	70.1 kB	✓
app-route-tu..prod.js gzip	48.7 kB	48.8 kB	✓
app-route.ru...dev.js gzip	70 kB	70.1 kB	✓
app-route.ru..prod.js gzip	48.7 kB	48.7 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	43.1 kB	43.2 kB	✓
pages-api-tu..prod.js gzip	32.9 kB	32.9 kB	✓
pages-api.ru...dev.js gzip	43.1 kB	43.2 kB	✓
pages-api.ru..prod.js gzip	32.8 kB	32.9 kB	✓
pages-turbo....dev.js gzip	52.4 kB	52.5 kB	✓
pages-turbo...prod.js gzip	39.4 kB	39.4 kB	✓
pages.runtim...dev.js gzip	52.4 kB	52.5 kB	✓
pages.runtim..prod.js gzip	39.3 kB	39.4 kB	✓
server.runti..prod.js gzip	62.5 kB	62.6 kB	✓
Total	2.77 MB	2.78 MB	⚠️ +2.24 kB

📝 Changed Files (25 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
app-route-ex..ntime.dev.js
app-route-ex..time.prod.js
app-route-tu..ntime.dev.js
app-route-tu..time.prod.js
app-route-tu..ntime.dev.js
app-route-tu..time.prod.js
app-route.runtime.dev.js
app-route.ru..time.prod.js
pages-api-tu..ntime.dev.js
pages-api-tu..time.prod.js
pages-api.runtime.dev.js
pages-api.ru..time.prod.js
... and 5 more

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app-page.runtime.dev.js

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app-route-ex..time.prod.js

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app-route-tu..ntime.dev.js

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app-route-tu..time.prod.js

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app-route.runtime.dev.js

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app-route.ru..time.prod.js

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pages-api-tu..ntime.dev.js

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pages-api-tu..time.prod.js

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pages-api.runtime.dev.js

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pages-api.ru..time.prod.js

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pages-turbo...ntime.dev.js

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pages-turbo...time.prod.js

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pages.runtime.dev.js

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pages.runtime.prod.js

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server.runtime.prod.js

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codspeed-hq · 2026-01-27T17:47:38Z

CodSpeed Performance Report

Merging this PR will degrade performance by 6.17%

_{Comparing mischnic/remove-build-id (0063c95) with mischnic/flight-nav-requests-build-id (e0e23b6)}

Summary

❌ 3 regressed benchmarks
✅ 14 untouched benchmarks
⏩ 3 skipped benchmarks¹

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

Performance Changes

	Mode	Benchmark	`BASE`	`HEAD`	Efficiency
❌	Simulation	`packages-bundle.js[full]`	999.1 ms	1,051.6 ms	-4.99%
❌	Simulation	`app-page-turbo.runtime.prod.js[full]`	654.1 ms	697.1 ms	-6.17%
❌	Simulation	`app-page-turbo.runtime.prod.js[tracing]`	571.2 ms	594.4 ms	-3.9%

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 added created-by: Turbopack team PRs by the Turbopack team. type: next labels Jan 27, 2026

mischnic mentioned this pull request Jan 27, 2026

Replace flight navigation build id field with header #88855

Merged

2 tasks

This was referenced Jan 27, 2026

Replace build id in Pages data routes with deployment id #88959

Merged

[test] Improve deployment skew test for Pages Router data routes #89038

Merged

vercel bot reviewed Jan 27, 2026

View reviewed changes

packages/next/src/server/app-render/app-render.tsx Outdated Show resolved Hide resolved

packages/next/src/server/route-modules/app-route/module.ts Outdated Show resolved Hide resolved

packages/next/src/build/index.ts Outdated Show resolved Hide resolved

mischnic changed the title ~~WIP don't load build id if missing~~ Don't include build id in runtime files if not needed Jan 27, 2026

nextjs-bot added the Turbopack Related to Turbopack with Next.js. label Jan 27, 2026

mischnic force-pushed the mischnic/flight-nav-requests-build-id branch from 223f376 to 76b4cf6 Compare January 27, 2026 19:43

mischnic force-pushed the mischnic/remove-build-id branch from 27682e6 to 18645bb Compare January 27, 2026 19:43

mischnic mentioned this pull request Jan 27, 2026

Proper e2e test of function determinism #88908

Merged

mischnic force-pushed the mischnic/flight-nav-requests-build-id branch from 76b4cf6 to ea8e86b Compare January 28, 2026 09:04

mischnic force-pushed the mischnic/remove-build-id branch 2 times, most recently from 7bd2a14 to 99fecc0 Compare January 28, 2026 10:38

mischnic force-pushed the mischnic/flight-nav-requests-build-id branch from ea8e86b to cad2c36 Compare January 28, 2026 10:38

mischnic force-pushed the mischnic/remove-build-id branch from 6621d9e to c3687a4 Compare January 28, 2026 16:24

mischnic force-pushed the mischnic/flight-nav-requests-build-id branch from cad2c36 to d5ca54e Compare January 29, 2026 08:55

mischnic force-pushed the mischnic/remove-build-id branch from c3687a4 to 4526717 Compare January 29, 2026 08:55

mischnic force-pushed the mischnic/flight-nav-requests-build-id branch from d5ca54e to 685d815 Compare January 29, 2026 10:52

mischnic force-pushed the mischnic/remove-build-id branch from 4526717 to 27eb1b8 Compare January 29, 2026 10:52

mischnic force-pushed the mischnic/flight-nav-requests-build-id branch from 685d815 to e240cec Compare January 29, 2026 13:24

mischnic force-pushed the mischnic/remove-build-id branch 2 times, most recently from c0e1fdb to 9f3a1e6 Compare January 29, 2026 13:35

mischnic force-pushed the mischnic/flight-nav-requests-build-id branch from e240cec to 4aa0a2d Compare January 29, 2026 13:35

mischnic force-pushed the mischnic/remove-build-id branch from 9f3a1e6 to a6d330d Compare January 29, 2026 13:59

mischnic force-pushed the mischnic/flight-nav-requests-build-id branch from 4aa0a2d to df56610 Compare January 29, 2026 13:59

mischnic force-pushed the mischnic/remove-build-id branch from a6d330d to fc4a347 Compare January 29, 2026 14:03

mischnic force-pushed the mischnic/flight-nav-requests-build-id branch from df56610 to 06dcfd5 Compare January 29, 2026 14:03

mischnic force-pushed the mischnic/remove-build-id branch 2 times, most recently from 5b35cd8 to 8cefa74 Compare January 29, 2026 16:59

mischnic marked this pull request as ready for review January 29, 2026 21:09

mischnic requested a review from timneutkens January 29, 2026 21:10

mischnic force-pushed the mischnic/remove-build-id branch from 8cefa74 to 81f7649 Compare January 30, 2026 11:40

mischnic force-pushed the mischnic/flight-nav-requests-build-id branch 2 times, most recently from fed758a to a595e10 Compare January 30, 2026 17:26

mischnic force-pushed the mischnic/remove-build-id branch from 81f7649 to 9a935fc Compare January 30, 2026 17:26

mischnic added 6 commits January 31, 2026 00:05

Don't load build id if missing

46f4b30

don't put .next/BUILD_ID into serverless function

edc8b9d

remove __NEXT_BUILD_ID for edge functions

96bfd47

fixup

1eb6986

cleanup

7429319

revert packages/next/src/server/lib/router-utils/filesystem.ts

0063c95

mischnic force-pushed the mischnic/flight-nav-requests-build-id branch from a595e10 to e0e23b6 Compare January 30, 2026 23:07

mischnic force-pushed the mischnic/remove-build-id branch from 9a935fc to 0063c95 Compare January 30, 2026 23:07

mischnic mentioned this pull request Jan 30, 2026

Handle Pages data route skew with deployment id header, take 2 #89325

Merged

mischnic changed the base branch from mischnic/flight-nav-requests-build-id to graphite-base/89112 February 3, 2026 09:13

mischnic closed this Feb 3, 2026

mischnic mentioned this pull request Feb 5, 2026

Proper e2e test of function determinism - adapter #89522

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Don't include build id in runtime files if not needed#89112

Don't include build id in runtime files if not needed#89112
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Stats from current PR

🔴 1 regression

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CodSpeed Performance Report

Merging this PR will degrade performance by 6.17%

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Performance Changes

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mischnic commented Jan 27, 2026 •

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