offline navigations: cache fallback and current-build assets (4/10) by feedthejim · Pull Request #93626 · vercel/next.js

feedthejim · 2026-05-08T00:13:52Z

Stack Position

This is PR 4 of 10. It teaches the service worker to cache the fallback document, fallback bootstrap assets, and current-build framework static assets.

Review guide:
https://gist.github.com/feedthejim/a10f757cf07c5550f731adf2fcf1077b

Full Stack

offline navigations: add gated build primitives (1/10) #93736 offline navigations: add gated build primitives (1/10)
offline navigations: generate fallback document artifacts (2/10) #93737 offline navigations: generate fallback document artifacts (2/10)
offline navigations: register pass-through worker (3/10) #93625 offline navigations: register pass-through worker (3/10)
This PR: offline navigations: cache fallback and current-build assets (4/10) #93626 offline navigations: cache fallback and current-build assets (4/10)
offline navigations: serve fallback document offline (5/10) #93627 offline navigations: serve fallback document offline (5/10)
offline navigations: add router-cache persistence primitives (6/10) #93630 offline navigations: add router-cache persistence primitives (6/10)
offline navigations: persist cached router records (7/10) #93640 offline navigations: persist cached router records (7/10)
offline navigations: bootstrap fallback from router records (8/10) #93644 offline navigations: bootstrap fallback from router records (8/10)
offline navigations: support dynamic route patterns (9/10) #93647 offline navigations: support dynamic route patterns (9/10)
offline navigations: add docs and examples (10/10) #93738 offline navigations: add docs and examples (10/10)

What This Changes

This is the runtime caching slice. The service worker caches:

the generated fallback document;
the bootstrap assets needed by that document;
current-build framework-managed _next/static assets that the page has already loaded or prefetched.

The current-build asset handoff intentionally uses browser cache lookups with cache: 'only-if-cached' and mode: 'same-origin', so the service worker does not duplicate network fetches and can preserve deployment query strings such as Vercel ?dpl=....

The generated caching worker source is split into compact concern-based fragments for URL normalization, deployment-query merging, required resource caching, static asset cache-key selection, current-asset promotion, and worker listeners. The emitted worker remains minified and size-budgeted.

This PR also adds a deploy-safe e2e fixture under test/e2e that observes the behavior through browser-visible APIs instead of reading .next.

What Works After This PR

The fallback document and current-build static assets can be present in Cache Storage. The service worker still does not serve the fallback document for failed navigations.

What Does Not Work Yet

Offline document recovery starts in PR 5. Persisted router-cache replay starts in PR 8.

Reviewer Focus

Please focus on the division of responsibility: the service worker owns document survival and static asset survival only. It should not parse Flight payloads, store per-route RSC data, or decide route eligibility.

Proof in This PR

Runtime and deploy-safe asset caching are covered by:

HEADLESS=true pnpm test-start-turbo test/e2e/app-dir/offline-navigations-deploy/offline-navigations-deploy.test.ts
HEADLESS=true pnpm test-start-turbo test/production/app-dir/offline-navigations/offline-navigations.test.ts
HEADLESS=true pnpm test-start-webpack test/production/app-dir/offline-navigations/offline-navigations.test.ts

The production suite also asserts that the emitted worker contains the expected message types, avoids comments and accidental whitespace, and stays under its byte budget. True deploy-mode proof is still pending CI or a custom deploy run. A local test-deploy-turbo attempt timed out during vercel link.

Deferred Coverage

PR 5 proves failed document requests can be answered with the fallback document. PR 8 proves a viewport-prefetched route can be reconstructed offline from persisted router records.

Docs Status

The user-facing guide and config reference land in PR 10.

github-actions · 2026-05-08T00:35:34Z

Failing test suites

Commit: 2cb2dd5 | About building and testing Next.js

pnpm test-deploy test/e2e/app-dir/offline-navigations-deploy/offline-navigations-deploy.test.ts (job)

offlineNavigations deploy-safe runtime behavior > registers the service worker and serves current-build assets from Cache Storage (DD)

Expand output

● offlineNavigations deploy-safe runtime behavior › registers the service worker and serves current-build assets from Cache Storage

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

Expected: "/docs/"
Received: null

   99 |       )
  100 |       expect(serviceWorkerResponse.status).toBe(200)
> 101 |       expect(serviceWorkerResponse.headers.get('service-worker-allowed')).toBe(
      |                                                                           ^
  102 |         '/docs/'
  103 |       )
  104 |

  at Object.toBe (e2e/app-dir/offline-navigations-deploy/offline-navigations-deploy.test.ts:101:75)

pnpm test-deploy test/e2e/app-dir/offline-navigations-deploy/offline-navigations-deploy.test.ts (job)

offlineNavigations deploy-safe runtime behavior > registers the service worker and serves current-build assets from Cache Storage (DD)

Expand output

● offlineNavigations deploy-safe runtime behavior › registers the service worker and serves current-build assets from Cache Storage

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

Expected: "/docs/"
Received: null

   99 |       )
  100 |       expect(serviceWorkerResponse.status).toBe(200)
> 101 |       expect(serviceWorkerResponse.headers.get('service-worker-allowed')).toBe(
      |                                                                           ^
  102 |         '/docs/'
  103 |       )
  104 |

  at Object.toBe (e2e/app-dir/offline-navigations-deploy/offline-navigations-deploy.test.ts:101:75)

vercel

Additional Suggestion:

The next-server-nft inline snapshot is missing the newly added /node_modules/next/dist/build/offline-navigation-service-worker.js entry, causing snapshot test failure.

github-actions · 2026-05-08T21:00:01Z

Stats from current PR

🔴 1 regression

Metric	Canary	PR	Change	Trend
node_modules Size	505 MB	505 MB	🔴 +145 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)	813ms	812ms	✓	███▁█
Cold (Ready in log)	782ms	774ms	✓	▇▇▇▁█
Cold (First Request)	1.224s	1.182s	✓	▅▆▃▂▅
Warm (Listen)	813ms	811ms	✓	▃█▁█▅
Warm (Ready in log)	781ms	771ms	✓	▃▂▃█▇
Warm (First Request)	587ms	570ms	✓	▄▃▃██

📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric	Canary	PR	Change	Trend
Cold (Listen)	813ms	811ms	✓	█████
Cold (Ready in log)	784ms	787ms	✓	█▇▇▆▇
Cold (First Request)	3.208s	3.225s	✓	█▆▄▄▅
Warm (Listen)	811ms	810ms	✓	█████
Warm (Ready in log)	786ms	789ms	✓	█▇▆▆▆
Warm (First Request)	3.260s	3.247s	✓	█▄▄▃▃

⚡ Production Builds

Metric	Canary	PR	Change	Trend
Fresh Build	4.681s	4.732s	✓	▅█▄▅▄
Cached Build	4.708s	4.751s	✓	▄█▅▃▆

📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric	Canary	PR	Change	Trend
Fresh Build	24.501s	24.181s	✓	██▅▂▆
Cached Build	24.092s	24.200s	✓	█▆▄▁▆
node_modules Size	505 MB	505 MB	🔴 +145 kB (+0%)	▁▇▇▇█

📦 Bundle Sizes

Bundle Sizes

⚡ Turbopack

Client

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Server

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	Canary	PR	Change
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Total	717 B	716 B	✅ -1 B

Build Details

Build Manifests

	Canary	PR	Change
_buildManifest.js gzip	433 B	432 B	✓
Total	433 B	432 B	✅ -1 B

📦 Webpack

Client

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Polyfills

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Pages

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Build Details

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🔄 Shared (bundler-independent)

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use-cache-pr...dev.js gzip	68 kB	68 kB	✓
Total	3.36 MB	3.36 MB	⚠️ +4 B

📝 Changed Files (3 files)

Files with changes:

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

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pages.runtime.prod.js

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server.runtime.prod.js

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📎 Tarball URL

https://vercel-packages.vercel.app/next/commits/cfe3cce60577213a8a6e243bc56c9f2076daf6a7/next

Commit: cfe3cce

github-actions Bot added created-by: Next.js team PRs by the Next.js team. tests type: next labels May 8, 2026

This was referenced May 8, 2026

offline navigations: serve fallback document offline (5/10) #93627

Draft

offline navigations: bridge fallback state to useOffline (7/25) #93628

Closed

This was referenced May 8, 2026

offline navigations: add router-cache persistence primitives (6/10) #93630

Draft

offline navigations: persist initial-load navigation data (11/25) #93634

Closed

feedthejim force-pushed the feedthejim/offline-navigations-service-worker branch from 19163ff to ff6adf4 Compare May 8, 2026 04:03

feedthejim force-pushed the feedthejim/offline-navigations-service-worker-cache branch from 33c0b95 to 4001039 Compare May 8, 2026 04:03

vercel Bot reviewed May 8, 2026

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feedthejim force-pushed the feedthejim/offline-navigations-service-worker branch from ff6adf4 to a7a800c Compare May 8, 2026 08:11

feedthejim force-pushed the feedthejim/offline-navigations-service-worker-cache branch from 4001039 to 829dcd8 Compare May 8, 2026 08:12

feedthejim force-pushed the feedthejim/offline-navigations-service-worker branch from a7a800c to 08e8b61 Compare May 8, 2026 17:45

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feedthejim changed the title ~~(5/10) Cache offline navigation artifacts in service worker~~ offline navigations: cache fallback artifacts (5/25) May 8, 2026

feedthejim force-pushed the feedthejim/offline-navigations-service-worker-cache branch from 1284032 to f85d95c Compare May 8, 2026 20:30

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This was referenced May 8, 2026

offline navigations: add gated build primitives (1/13) #93622

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offline navigations: emit fallback manifest data (2/13) #93624

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feedthejim changed the title ~~offline navigations: cache fallback artifacts (5/25)~~ offline navigations: cache fallback artifacts (4/13) May 8, 2026

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feedthejim changed the title ~~offline navigations: cache fallback artifacts (4/13)~~ offline navigations: cache fallback artifacts (4/10) May 10, 2026

This was referenced May 10, 2026

offline navigations: add gated build primitives (1/10) #93736

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offline navigations: generate fallback document artifacts (2/10) #93737

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feedthejim force-pushed the feedthejim/offline-navigations-service-worker branch from 3a6dc55 to a7c6088 Compare May 10, 2026 19:06

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feedthejim changed the title ~~offline navigations: cache fallback artifacts (4/10)~~ offline navigations: cache fallback artifacts (4/11) May 10, 2026

feedthejim mentioned this pull request May 10, 2026

offline navigations: add docs and examples (10/10) #93738

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feedthejim changed the title ~~offline navigations: cache fallback artifacts (4/11)~~ offline navigations: cache fallback and current-build assets (4/10) May 10, 2026

feedthejim force-pushed the feedthejim/offline-navigations-service-worker-cache branch from 694e1d0 to 1732a28 Compare May 11, 2026 03:04

offline navigations: cache fallback and current-build assets (4/10)

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offline navigations: cache fallback and current-build assets (4/10)#93626

offline navigations: cache fallback and current-build assets (4/10)#93626
feedthejim wants to merge 1 commit intofeedthejim/offline-navigations-service-workerfrom
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