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(1/1) Cover offline server action boundaries#93685

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(1/1) Cover offline server action boundaries#93685
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Stack Position

This is a focused request-shape stress PR stacked on #93683, (1/1) Cover encoded slash offline misses.

It covers the first MUTATION-01 row from the offline navigations stress plan: server action submissions while the browser is offline. This PR is intentionally test-only. It does not change service worker routing, fallback boot, or server action behavior.

What Changed

  • Adds does not serve fallback HTML to offline server action submissions to the offline navigations production e2e suite.
  • Reuses the existing server action invalidation form on the fixture root page.
  • Asserts the mutation request fails as a POST network request while offline, rather than being answered by generated fallback HTML.

Behavior Covered

The e2e:

  1. Builds and starts the offline navigations fixture.
  2. Loads /docs online and waits for the generated service worker.
  3. Registers a listener for next-offline-navigation-fallback-served messages.
  4. Switches the browser context offline.
  5. Submits the existing invalidateOfflineNavigationAction server action form.
  6. Waits for the POST request to fail with an offline network error.
  7. Asserts no fallback-served message was emitted.
  8. Asserts generated fallback/cache-miss UI did not render.
  9. Asserts the current app page remains intact.

This protects the service worker contract: failed same-origin document navigations may receive the fallback document, but server action POSTs are unsafe app mutations and must pass through or fail normally.

Intentionally Not Covered Yet

  • Plain non-JS form POST fallback behavior.
  • Redirecting server action while offline.
  • Route-handler mutation POSTs beyond the existing fetch POST pass-through probe.
  • Reconnect retry after a failed offline mutation.
  • Successful online retry invalidating durable offline records.

Verification

  • pnpm prettier --with-node-modules --ignore-path .prettierignore --write test/production/app-dir/offline-navigations/offline-navigations.test.ts
  • npx eslint --config eslint.config.mjs --fix test/production/app-dir/offline-navigations/offline-navigations.test.ts
  • git diff --check -- test/production/app-dir/offline-navigations/offline-navigations.test.ts
  • NEXT_SKIP_ISOLATE=1 pnpm test-start-turbo test/production/app-dir/offline-navigations/offline-navigations.test.ts -t "does not serve fallback HTML to offline server action submissions"
  • pnpm test-start-webpack test/production/app-dir/offline-navigations/offline-navigations.test.ts -t "does not serve fallback HTML to offline server action submissions"
  • commit hook: lint-staged reran prettier and eslint for the touched file

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github-actions Bot commented May 8, 2026

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Tests Passed

Commit: 2f88a6c

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Stats from current PR

🔴 1 regression

Metric Canary PR Change Trend
node_modules Size 505 MB 508 MB 🔴 +2.69 MB (+1%) █████
📊 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) 812ms 810ms ▃▅▅▁▅
Cold (Ready in log) 789ms 790ms ▄▁▅▇█
Cold (First Request) 1.231s 1.238s ▄▁▄▄▆
Warm (Listen) 811ms 810ms ▃▆▃▁▆
Warm (Ready in log) 790ms 792ms ▄▁▅▆█
Warm (First Request) 610ms 618ms ▄▁▅▇█
📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric Canary PR Change Trend
Cold (Listen) 812ms 811ms █████
Cold (Ready in log) 785ms 784ms ▇████
Cold (First Request) 3.229s 3.241s ▄▇▇█▆
Warm (Listen) 811ms 810ms █████
Warm (Ready in log) 784ms 786ms ▇███▇
Warm (First Request) 3.237s 3.256s ▄▆▇█▅

⚡ Production Builds

Metric Canary PR Change Trend
Fresh Build 4.741s 4.749s ▃▂█▇▅
Cached Build 4.760s 4.785s ▃▃▃▆▅
📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric Canary PR Change Trend
Fresh Build 24.010s 24.039s ▃█▆▅▆
Cached Build 24.263s 24.202s ▂█▄▄▅
node_modules Size 505 MB 508 MB 🔴 +2.69 MB (+1%) █████
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Total 719 B 717 B ✅ -2 B
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🔄 Shared (bundler-independent)

Runtimes
Canary PR Change
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📝 Changed Files (9 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
  • server.runtime.prod.js
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📎 Tarball URL
https://vercel-packages.vercel.app/next/commits/2f88a6cd0a4a73ed48740a5ed50a9dc6178ad4bd/next

Commit: 2f88a6c

@feedthejim

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Closing this draft as part of the offline navigations first-usable restack.

The current review stack is the 25-PR sequence rooted at #93622, ending at #93656, with #93648 folded into PR 22 and the stress-only rows deferred into named P1/P2 owners. The branch is intentionally left intact so the coverage can be recovered or rebundled later.

Review guide: https://gist.github.com/feedthejim/b3d9fe26a7c05655fd57adcce371b93d

@feedthejim feedthejim closed this May 8, 2026
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