fix(router-core): reserve same-ID loader work until a navigation plans by Sheraff · Pull Request #8645 · TanStack/router

Sheraff · 2026-10-09T18:16:38Z

AI-authored (Claude Code), opened at the maintainer's request.

🎯 Changes

Fixes #8644. With staleReloadMode: 'background', a navigation started from an effect of the revealed route dropped the pending background reload.

Cause

The superseded transaction released its background candidates after the React render ack.
In React, that happens after the successor is installed but before it plans loaders.
No reservation covered that window. The baseline grace only applied while the successor was visibly in beforeLoad, so the flight was aborted.
The successor (cause: 'stay') then never reloaded.

Fix
Keeping same-ID work alive until the successor decides was spread across three mechanisms:

deferSameIdFlight at supersession;
the isFetching === 'beforeLoad' grace in releaseOwnedFlight;
the global zero-lease sweep after planning.

These are replaced with one explicit reservation. When installed, a transaction records the discoverable same-ID flights:

for (const match of matches) {
  const flight = router._flights?.get(match.id)
  if (flight) {
    reserved.push([match.id, flight])
  }
}

Any owner that drops a reserved flight's last lease leaves it discoverable, whether that's the predecessor's lane, its background candidates, or a preload. Planning, or supersession, ends the reservation and retires the unadopted flights. A reservation is not a lease: an unowned reserved generation that fails still aborts without onError. Existing tests pin this.

Dev-only refresh moves to tuple slot 7, so production transactions stay packed.

Tests

react-router: issue repro. Fails on main.
router-core: a preload that exits early on a child redirect, while the successor is in beforeLoad, must donate its pending loader.
solid-router, vue-router: issue scenario. Passes on main too, because their ack ordering hides the race.

Bundle size vs main: −21 to −38 B raw in every app; gzip −15 to +17 B.

✅ Checklist

I have followed the steps in the Contributing guide.
I have tested code changes locally with the relevant test commands, or tests do not apply to this pull request.
I fully understand the code in this pull request, including any code generated with AI assistance.

🚀 Release Impact

This change affects published code, and I have generated a changeset.
This change is docs/CI/dev-only (no release).

🤖 Generated with Claude Code

Summary by CodeRabbit

Bug Fixes
- Background reloads can carry over to a navigation, allowing the destination to display the latest loader data.
- Fixed stale displayed data when a save-related navigation updates the page and clears its search parameters. Verified in React, Solid, and Vue Routers.
- Fixed cases where a superseding navigation could abort pending loader work needed by the winning navigation or trigger duplicate loads. A pending load is now reused when appropriate and stopped when no longer needed.

A navigation started from an effect of a route revealed with stale data (staleReloadMode 'background') discarded the pending background reload: the superseded transaction released its private background candidates with no recipient before the successor planned, so the flight was aborted and the successor (cause 'stay') never reloaded. The transaction now references its lane until background publication, and supersession hands the predecessor's background candidates to the successor through the same same-ID transfer used for its foreground matches. The dev-only refresh slot moves to index 7 so production transactions stay packed. Fixes #8644 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

changeset-bot · 2026-10-09T18:16:44Z

🦋 Changeset detected

Latest commit: 7a5fc9d

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 23 packages

Name	Type
@tanstack/router-core	Patch
@tanstack/react-router	Patch
@tanstack/react-start-client	Patch
@tanstack/react-start-rsc	Patch
@tanstack/react-start-server	Patch
@tanstack/router-generator	Patch
@tanstack/router-plugin	Patch
@tanstack/solid-router	Patch
@tanstack/solid-start-client	Patch
@tanstack/solid-start-server	Patch
@tanstack/start-client-core	Patch
@tanstack/start-plugin-core	Patch
@tanstack/start-server-core	Patch
@tanstack/start-storage-context	Patch
@tanstack/vue-router	Patch
@tanstack/vue-start-client	Patch
@tanstack/vue-start-server	Patch
@tanstack/react-start	Patch
@tanstack/router-cli	Patch
@tanstack/router-vite-plugin	Patch
@tanstack/solid-start	Patch
@tanstack/start-static-server-functions	Patch
@tanstack/vue-start	Patch

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nx-cloud · 2026-10-09T18:17:09Z

View your CI Pipeline Execution ↗ for commit 7a5fc9d

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☁️ Nx Cloud last updated this comment at 2026-10-10 10:25:06 UTC

coderabbitai · 2026-10-09T18:17:27Z

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packages/router-core/tests/loader-architecture-regressions.test.ts

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packages/router-core/tests/loader-architecture-regressions.test.ts

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📝 Walkthrough

Walkthrough

Router-core transactions reserve matching loader flights until loader planning ends. Reservations can keep flights discoverable after their final lease is released. Regression tests cover loader reuse and effect-triggered replacement navigation across React, Solid, and Vue.

Changes

Loader-flight handoff

Layer / File(s)	Summary
Transaction reservations and flight lifecycle `packages/router-core/src/load-client.ts`, `packages/router-core/INTERNALS.md`, `.changeset/background-reload-effect-handoff.md`, `packages/router-core/tests/hmr-refresh-lifecycle.test.ts`	Transactions reserve registered flights for matching IDs when installed. Releasing a flight preserves it while reserved; ending reservations retires and aborts unleased flights. Loader planning ends the current transaction’s reservations instead of sweeping all zero-lease flights. The internals document describes this behavior, the changeset records the router-core patch, and the development refresh tuple moves from slot 6 to slot 7.
Regression coverage `packages/router-core/tests/loader-architecture-regressions.test.ts`, `packages/react-router/tests/issue-8644-background-reload-effect-navigation.test.tsx`, `packages/solid-router/tests/issue-8644-background-reload-effect-navigation.test.tsx`, `packages/vue-router/tests/issue-8644-background-reload-effect-navigation.test.tsx`	Core tests cover pending loader reuse across navigations and abortion when a newer navigation leaves before loader planning ends. Framework tests cover save navigation followed by search replacement while a background reload is pending.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix · Severity of issue fixed: Medium

Merge Risk: ⚪ Minimal · up to 7a5fc

The loader-handoff regression test now checks the loader count after pending work has had a chance to run. No outstanding issue in this change prevents merging after normal checks.

Pre-merge checks | 4 | 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 25.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 12 functions across 6 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check		The title clearly and concisely describes the main change: reserving same-ID loader work until navigation planning.
Description check		The description explains the issue, cause, fix, tests, release impact, AI authorship, and changeset. The checklist is mostly complete; only the code-understanding item remains unchecked.
Linked Issues check		Issue `#8644` requires the default background reload to survive a navigation started by the revealed route effect and update loader data. The React regression test reproduces the save flow, effect navig…
Out of Scope Changes check		The changes stay within issue `#8644`. The reservation lifecycle implements the reload handoff. The router-core, React, Solid, and Vue tests cover the reported race and related lifecycle cases. The inte…

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github-actions · 2026-10-09T18:18:10Z

🚀 Changeset Version Preview

1 package(s) bumped directly, 22 bumped as dependents.

🟩 Patch bumps

Package	Version	Reason
`@tanstack/router-core`	1.171.35 → 1.171.36	Changeset
`@tanstack/react-router`	1.170.42 → 1.170.43	Dependent
`@tanstack/react-start`	1.168.61 → 1.168.62	Dependent
`@tanstack/react-start-client`	1.168.40 → 1.168.41	Dependent
`@tanstack/react-start-rsc`	0.1.60 → 0.1.61	Dependent
`@tanstack/react-start-server`	1.167.47 → 1.167.48	Dependent
`@tanstack/router-cli`	1.167.41 → 1.167.42	Dependent
`@tanstack/router-generator`	1.167.41 → 1.167.42	Dependent
`@tanstack/router-plugin`	1.168.43 → 1.168.44	Dependent
`@tanstack/router-vite-plugin`	1.167.43 → 1.167.44	Dependent
`@tanstack/solid-router`	1.170.39 → 1.170.40	Dependent
`@tanstack/solid-start`	1.168.58 → 1.168.59	Dependent
`@tanstack/solid-start-client`	1.168.38 → 1.168.39	Dependent
`@tanstack/solid-start-server`	1.167.45 → 1.167.46	Dependent
`@tanstack/start-client-core`	1.170.35 → 1.170.36	Dependent
`@tanstack/start-plugin-core`	1.171.50 → 1.171.51	Dependent
`@tanstack/start-server-core`	1.169.40 → 1.169.41	Dependent
`@tanstack/start-static-server-functions`	1.167.40 → 1.167.41	Dependent
`@tanstack/start-storage-context`	1.167.37 → 1.167.38	Dependent
`@tanstack/vue-router`	1.170.38 → 1.170.39	Dependent
`@tanstack/vue-start`	1.168.57 → 1.168.58	Dependent
`@tanstack/vue-start-client`	1.167.41 → 1.167.42	Dependent
`@tanstack/vue-start-server`	1.167.45 → 1.167.46	Dependent

github-actions · 2026-10-09T18:21:05Z

Bundle Size Benchmarks

Commit: 94f3145a583a
Measured at: 2026-10-10T10:15:28.623Z
Baseline source: history:ff9f753c090c
Dashboard: bundle-size history

The following scenarios have bundle-size changes compared with the baseline:

Scenario	Current (gzip)	Initial (gzip)	Raw	Brotli	Trend
`react-router.minimal`	84.0 KiB +133 B	83.9 KiB +132 B	261.4 KiB +312 B	73.2 KiB +143 B	▅▅▅▅▅▅▅▁▅██▇
`react-router.full`	87.6 KiB +50 B	87.4 KiB +54 B	273.3 KiB +107 B	76.4 KiB +29 B	▂▂▂▂▂▂▂▁▂███
`solid-router.minimal`	33.3 KiB -72 B	33.2 KiB -70 B	95.2 KiB -114 B	30.2 KiB +8 B	███████▄█▁▁▁
`solid-router.full`	38.2 KiB -93 B	38.1 KiB -95 B	110.0 KiB -270 B	34.5 KiB -91 B	███████▅█▁▁▁
`vue-router.minimal`	49.4 KiB +7 B	49.3 KiB +8 B	136.4 KiB +23 B	44.8 KiB +66 B	███████▁█▂▂▂
`vue-router.full`	55.0 KiB -37 B	54.9 KiB -36 B	154.6 KiB -135 B	49.7 KiB +75 B	███████▄█▁▁▁
`react-start.minimal`	96.8 KiB +75 B	96.6 KiB +75 B	302.3 KiB +216 B	84.0 KiB +6 B	▇▇▇▇▇▇▃▁▃███
`react-start.query-integration`	104.2 KiB +62 B	104.1 KiB +62 B	328.9 KiB +191 B	90.4 KiB -19 B	██████▃▁▃▆▆▆
`react-start.deferred-hydration`	97.5 KiB +86 B	96.7 KiB +83 B	303.7 KiB +211 B	84.7 KiB +31 B	▇▇▇▇▇▇▃▁▃███
`react-start.full`	100.0 KiB +73 B	99.8 KiB +76 B	312.1 KiB +132 B	86.8 KiB +64 B	▆▆▆▆▆▆▂▁▂▆▆█
`react-start.rsbuild.minimal`	100.3 KiB +39 B	100.2 KiB +40 B	313.2 KiB +118 B	86.7 KiB +32 B	██████▃▁▃▃▃▄
`react-start.rsbuild.minimal-iife`	100.8 KiB +42 B	100.6 KiB +43 B	314.1 KiB +119 B	87.0 KiB -22 B	██████▃▁▃▃▃▄
`react-start.rsbuild.full`	103.6 KiB +11 B	103.4 KiB +12 B	323.3 KiB +20 B	89.5 KiB +91 B	██████▂▁▂▂▂▂
`solid-start.minimal`	46.2 KiB -19 B	46.0 KiB -19 B	135.0 KiB +32 B	41.2 KiB +16 B	██████▆▂▆▁▁▁
`solid-start.deferred-hydration`	49.2 KiB -12 B	46.1 KiB -3 B	142.3 KiB -4 B	43.9 KiB -18 B	██████▆▂▆▁▁▁
`solid-start.full`	51.3 KiB -55 B	51.2 KiB -53 B	150.4 KiB -96 B	45.5 KiB -134 B	██████▆▄▆▁▁▁
`vue-start.minimal`	65.3 KiB -39 B	65.2 KiB -38 B	185.6 KiB -135 B	58.4 KiB -69 B	██████▆▃▆▁▁▁
`vue-start.full`	69.2 KiB -40 B	69.1 KiB -38 B	198.0 KiB -128 B	61.6 KiB -56 B	██████▆▃▆▂▂▁

Current gzip tracks all emitted client JS chunks. Initial gzip tracks only the entry/import graph. Trend sparkline is historical current gzip ending with this PR measurement; lower is better.

pkg-pr-new · 2026-10-09T18:22:50Z

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commit: 7a5fc9d

codspeed · 2026-10-09T18:36:00Z

Merging this PR will regress 1 benchmark

ℹ️ 3 benchmarks have no flame graph

The flamegraph could not be generated because too much time was spent in runtime internals, making the visualization not useful for performance analysis.

client-search-params navigation loop (solid)

hydrate restored route state and mixed Links (solid)

client-links navigation loop (solid)

⚠️

Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 5 improved benchmarks
❌ 1 regressed benchmark
✅ 188 untouched benchmarks
⏩ 3 skipped benchmarks¹

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	`BASE`	`HEAD`	Efficiency
❌	Memory	`mem client loader-data-retention (vue)`	94.8 KB	106.3 KB	-10.87%
⚡	Memory	`mem client navigation-churn (solid)`	98.1 KB	85.5 KB	+14.8%
⚡	Memory	`mem client unique-location-churn (solid)`	62.2 KB	57.9 KB	+7.32%
⚡	Memory	`mem client unique-location-churn (vue)`	96.5 KB	90.4 KB	+6.71%
⚡	Memory	`mem server error-paths redirect (react)`	12 KB	11.7 KB	+3.35%
⚡	Memory	`mem client navigation-churn (vue)`	116.2 KB	112.7 KB	+3.14%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

_{Comparing fix/background-reload-effect-handoff (7a5fc9d) with main (c79c620)}

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. ↩

…-effect-handoff

… plans Replace the supersession handoff of background candidates with one reservation concept: a navigation records the same-ID flights that are discoverable when it is installed, and until its loader planning ends that reservation, any owner losing a reserved flight's final lease leaves it discoverable instead of aborting it. Planning (or supersession) retires every reserved flight nobody adopted. This subsumes the predecessor's deferred same-ID leases, the `isFetching === 'beforeLoad'` grace in `releaseOwnedFlight`, and the post-planning zero-lease sweep, and removes the transaction lane slot. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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Review comments at @packages/router-core/src/load-client.ts:
- Around line 1427-1429: Update runClientTransaction to release the completing
tx’s reservations when executeClientLane throws, then rethrow the error. When
handling a canceled result, call endReservations only if router._tx === tx, so
cancellation of a predecessor cannot clear a successor’s reservations.

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.changeset/background-reload-effect-handoff.md
packages/router-core/INTERNALS.md
packages/router-core/src/load-client.ts

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.changeset/background-reload-effect-handoff.md

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…anning A navigation canceled through its public abortController still reaches loader planning, but the reservation release was gated on a live signal, so its stale reservations kept protecting unowned same-ID loaders until the next navigation. End them whenever the lane's own transaction is still current; a successor has already ended them otherwise. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

…efore planning" A navigation's controller is only aborted internally by supersession, whose successor already ends the reservations, or by the redirect limit after planning. Aborting it from user code is unsupported, so the state is unreachable. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Leaving before loader planning must retire same-ID work the superseded navigation reserved and nobody adopted, aborting its loader signal. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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Inline comments:
Review comments at
@packages/router-core/tests/loader-architecture-regressions.test.ts:
- Around line 608-620: In the supersession regression test, flush the pending
`beforeLoad` continuation and deferred loader work after
`beforeLoadGate.resolve()` and before checking `signals`. Keep the `/other`
location and aborted-signal assertions unchanged, and ensure the loader-count
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…aders Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

github-actions Bot added package: react-router package: router-core package: solid-router package: vue-router labels Oct 9, 2026

Sheraff and others added 2 commits October 9, 2026 20:42

Merge remote-tracking branch 'origin/main' into fix/background-reload…

24d1371

…-effect-handoff

Sheraff changed the title ~~fix(router-core): hand superseded background reloads to the successor~~ fix(router-core): reserve same-ID loader work until a navigation plans Oct 9, 2026

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Comment thread packages/router-core/src/load-client.ts

Sheraff and others added 3 commits October 9, 2026 21:23

test(router-core): cover ending a superseded navigation's reservations

a53e1b8

Leaving before loader planning must retire same-ID work the superseded navigation reserved and nobody adopted, aborting its loader signal. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

coderabbitai Bot reviewed Oct 9, 2026

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Comment thread packages/router-core/tests/loader-architecture-regressions.test.ts

test(router-core): flush the superseded beforeLoad before counting lo…

7a5fc9d

…aders Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Sheraff mentioned this pull request Oct 15, 2026

fix(router-core): keep same-ID loader work discoverable until a navigation plans #8722

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fix(router-core): reserve same-ID loader work until a navigation plans - #8645

fix(router-core): reserve same-ID loader work until a navigation plans#8645
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fix/background-reload-effect-handoff

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