Simplify loader flight and render acknowledgement ownership

[Sheraff]

Summary

This stacks on #7805 and simplifies its match-loading rewrite around one rule: each match ID has at most one discoverable loader generation, each flight has one normalized outcome, and lane ownership decides where that outcome may publish.

The change closes the supported orchestration races selected from #7911 without adding another flag, counter, deadline, or completion promise. After the final automated formatting pass, the production diff is +153/-173 lines (net -20).

Architecture

• Loader work is claimed synchronously after a lane completes beforeLoad contextualization, before the async frame yields. This removes the zero-owner handoff gap without a retry loop.
• Consumers already joined to a loader flight share its outcome, including error and notFound.
• A non-success flight is removed from discovery before normalization callbacks run. Existing consumers retain it through their leases, while a later navigation or an onError-reentrant navigation starts a fresh generation.
• Preload redirect continuation is owned by the preload's _preloads controller entry rather than an unrelated foreground _tx.
• React render completion acknowledges the exact offered matches-array reference through one router-owned tuple. This replaces structural match signatures and component-local acknowledgement state.
• Lazy option installation, pending-component readiness, and normal-component readiness are distinct phases. An active client lane reuses its existing pending-offer callback once a newly installed pendingComponent finishes its own preload; route success still waits for the normal component. The correction moves the existing chunk wake-up earlier rather than adding another offer or authority.

The resulting authorities are deliberately narrow:

• _tx owns foreground publication.
• _preloads owns speculative cancellation and private redirect continuation.
• The loader-flight registry controls discovery.
• Match leases control loader lifetime.
• The exact React receipt controls render acknowledgement.

The lazy pending callback is internal. RouterCore.loadRouteChunk retains its previous two-argument public type.

Intentional semantics and compromises

• A provider owns one router for its lifetime. Router swapping and separate Activity/unmount completion machinery are intentionally not supported.
• Every lane runs its own uncached beforeLoad; its context and control flow remain lane-local.
• Loader results are cached, and discovery is single-flight per match ID. A joined loader can therefore publish a value produced with the context of the lane that started it.
• shouldReload: true requires a loader generation but does not bypass discoverable same-ID work. The active-flight overlap is otherwise undefined; using the uniform rule preserves the relevant main behavior and removes bytes.
• A navigation that has joined a pending preload consumes that loader's shared error or notFound. A navigation planned after the terminal flight has retired retries normally.
• invalidate() reruns planning and beforeLoad, but does not introduce matches owned only by an active speculative preload as a second invalidation/admission authority. Same-ID loader work owned only by that preload can remain discoverable and reusable, including its old-context value.
• Replacing a default pending fallback with a lazy route fallback keeps the same pending session and absolute reveal deadline. It does not restart pendingMs or rebase a pendingMinMs deadline that an exact render acknowledgement has already established. If the replacement supersedes an unacknowledged offer, its own exact acknowledgement establishes the minimum-visible deadline under the existing receipt rules.

How #7911 was integrated

#7911, the independent audit, and the proposed mechanism were used as sources of candidate specifications and reproductions, not adopted wholesale.

Adopted or reformulated

• Pending preload error and notFound are shared with an already-joined navigation. The final tests use deterministic public-API gates.
• A failed pending parent preload remains shared while independently started descendant work can settle.
• A later navigation retries after a completed failed preload while retaining reusable successful ancestor loader data.
• A standalone preload redirect continues privately and cannot overwrite an unrelated navigation error.
• The background-successor probe was reduced to a public-API test proving that a successor does not fall back to older cached data while a generation is in flight. It intentionally does not constrain whether the successor joins that generation or starts a later one.
• React has public Suspense coverage proving that a suspended same-membership publication cannot acknowledge its successor. Exact-reference acknowledgement is the implementation used to enforce that contract.
• The Router defaultPendingComponent Not effective(version:1.121.24) #4467 Solid lazy-pending test is retained as a public phase contract and strengthened with four independent gates: lazy options, lazy pending-component preload, normal component preload, and loader completion. It proves that the default fallback remains until the lazy fallback is render-ready, then the lazy fallback replaces it while the normal component and loader are still pending. The first PR revision failed this contract in CI because it waited for the normal component too.
• The Route head function can still execute before loader function finishes #6221 Vite SSR E2E verifies body/head consistency after browser back and reproduces the demonstrated main regression where the body is fresh but the head/title remains stale. Unlike the React receipt test, this is a demonstrated main regression.

Corrected to match supported behavior

• The AbortController is not properly caught in parent loader #3928 rapid-successor test now preserves main semantics: one active same-ID parent loader may serve multiple successors, including its old-context value, while loaderDeps-keyed child loaders supersede normally.
• Same-generation failures normalize once for joined consumers.
• A navigation started from onError receives a fresh generation because the terminal flight is retired before callbacks.
• A superseded terminal reservation cannot poison a successor delayed in beforeLoad.

Intentionally not adopted

• Provider router swapping.
• A second React Activity/unmount completion authority or private HMR _refreshRoute behavior.
• Forcing shouldReload: true to duplicate active same-ID loader work.
• Turning invalidation into a separate active-preload admission/cancellation model.
• A guarantee that loaders always observe or publish the newest beforeLoad context.
• Mask coverage that already passed on main, redundant cases, and probes that required mutating internals.
• The broader unrelated SSR, protocol, and framework fixes explored by wip for fix-router-core-lane-match-loader #7911.

Size and performance

Compared with the exact base commit b8204ea9ad:

• react-router.minimal: -67 B gzip, -65 B initial gzip, -227 B raw, and -73 B Brotli.
• solid-router.minimal: -13 B gzip, -13 B initial gzip, -92 B raw, and +24 B Brotli.
• All 17 bundle scenarios improve gzip by 6–88 B, with no JS chunk-count changes.
• Summed scenario snapshots: -622 B gzip, -622 B initial gzip, -2,539 B raw, and -941 B Brotli.

The Solid CI correction costs 31 B gzip in react-router.minimal, 29 B in solid-router.minimal, and 598 B summed across the 17 scenarios relative to the first PR revision. Several equivalent phase implementations were measured and rejected; the retained callback-threaded version ties for the smallest gzip result that also waits for the pending component's own framework preload, while keeping the better Brotli result and clearer source. The complete PR remains smaller than the exact base in every gzip scenario.

Three individual scenario totals have small Brotli increases despite raw and gzip improvements; aggregate Brotli decreases and no chunks are added.

Focused runtime benchmarks on the first PR revision showed no regression signal. The lazy-phase follow-up moves an existing notification on a path those workloads do not exercise:

• Base navigation, async pipeline, and mount deltas were within RME (-0.16%, -0.11%, and +0.24% throughput).
• Loader throughput improved 1.13% with mean time down 1.12%.
• Preload throughput improved 1.85% with mean time down 1.81%.

Validation

• Router core: 104 files, 1,513 passed, 3 expected failures.
• React Router: 73 files, 987 passed, 1 skipped.
• Solid Router: 54 client files with 837 passed and 1 skipped; 3 server files with 3 passed.
• Vue Router: 54 files, 814 passed, 1 skipped.
• The strengthened Solid lazy-pending regression passed explicitly on the final formatted source.
• Focused orchestration coverage: 154/154 passed.
• Router core, React, and Solid type tests passed with TypeScript 5.6, 5.7, 5.8, 5.9, 6.0, and 7.0; Vue's type suite passed 138/138.
• ESLint completed with zero errors; existing warnings remain.
• Automated formatting and git diff --check passed.
• The comprehensive test and bundle checks passed on the final autofixed head.
• CodSpeed's external analysis remains report-only red. Its own result warns that the comparison used different runtime environments and shows large bidirectional memory swings across unrelated workloads; the final lazy-phase path is not exercised by those benchmarks, so no runtime patch was layered on from that signal.
• Route head function can still execute before loader function finishes #6221 Vite SSR E2E: 1/1 passed.
• Both React memory smoke runs passed all six workloads. These were correctness smokes, not memory measurements.

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☁️ Nx Cloud last updated this comment at 2026-07-30 18:36:53 UTC

[github-actions]

🚀 Changeset Version Preview

4 package(s) bumped directly, 19 bumped as dependents.

🟩 Patch bumps

Package	Version	Reason
@tanstack/react-router	1.170.18 → 1.170.19	Changeset
@tanstack/router-core	1.171.15 → 1.171.16	Changeset
@tanstack/solid-router	1.170.18 → 1.170.19	Changeset
@tanstack/vue-router	1.170.17 → 1.170.18	Changeset
@tanstack/react-start	1.168.32 → 1.168.33	Dependent
@tanstack/react-start-client	1.168.16 → 1.168.17	Dependent
@tanstack/react-start-rsc	0.1.31 → 0.1.32	Dependent
@tanstack/react-start-server	1.167.22 → 1.167.23	Dependent
@tanstack/router-cli	1.167.21 → 1.167.22	Dependent
@tanstack/router-generator	1.167.21 → 1.167.22	Dependent
@tanstack/router-plugin	1.168.23 → 1.168.24	Dependent
@tanstack/router-vite-plugin	1.167.23 → 1.167.24	Dependent
@tanstack/solid-start	1.168.32 → 1.168.33	Dependent
@tanstack/solid-start-client	1.168.16 → 1.168.17	Dependent
@tanstack/solid-start-server	1.167.22 → 1.167.23	Dependent
@tanstack/start-client-core	1.170.14 → 1.170.15	Dependent
@tanstack/start-plugin-core	1.171.24 → 1.171.25	Dependent
@tanstack/start-server-core	1.169.17 → 1.169.18	Dependent
@tanstack/start-static-server-functions	1.167.19 → 1.167.20	Dependent
@tanstack/start-storage-context	1.167.17 → 1.167.18	Dependent
@tanstack/vue-start	1.168.31 → 1.168.32	Dependent
@tanstack/vue-start-client	1.167.19 → 1.167.20	Dependent
@tanstack/vue-start-server	1.167.22 → 1.167.23	Dependent

[github-actions]

Bundle Size Benchmarks

• Commit: 24dc0c538e7d
• Measured at: 2026-07-30T18:26:23.511Z
• Baseline source: history:a3ee355b5934
• Dashboard: bundle-size history

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

Scenario	Current (gzip)	Delta vs baseline	Initial gzip	Raw	Brotli	Trend
react-router.minimal	87.14 KiB	-212 B (-0.24%)	87.00 KiB	269.24 KiB	75.87 KiB	███████████▁
react-router.full	90.93 KiB	-131 B (-0.14%)	90.80 KiB	281.25 KiB	79.18 KiB	███████████▁
solid-router.minimal	34.90 KiB	-642 B (-1.76%)	34.77 KiB	100.15 KiB	31.50 KiB	███████████▁
solid-router.full	40.01 KiB	-588 B (-1.41%)	39.88 KiB	115.38 KiB	35.98 KiB	███████████▁
vue-router.minimal	52.20 KiB	-815 B (-1.50%)	52.07 KiB	143.31 KiB	47.00 KiB	███████████▁
vue-router.full	58.16 KiB	-795 B (-1.32%)	58.03 KiB	162.08 KiB	52.21 KiB	███████████▁
react-start.minimal	102.15 KiB	+170 B (+0.16%)	102.01 KiB	318.39 KiB	88.68 KiB	▁▁▁▁▁▁▁▁▁▁▁█
react-start.deferred-hydration	102.89 KiB	+169 B (+0.16%)	102.04 KiB	319.77 KiB	89.35 KiB	▁▁▁▁▁▁▁▁▁▁▁█
react-start.full	105.52 KiB	+163 B (+0.15%)	105.38 KiB	328.39 KiB	91.49 KiB	▁▁▁▁▁▁▁▁▁▁▁█
react-start.rsbuild.minimal	99.88 KiB	+187 B (+0.18%)	99.71 KiB	312.81 KiB	86.13 KiB	▁▁▁▁▁▁▁▁▁▂▂█
react-start.rsbuild.minimal-iife	100.28 KiB	+187 B (+0.18%)	100.11 KiB	313.75 KiB	86.47 KiB	▁▁▁▁▁▁▁▁▁▂▂█
react-start.rsbuild.full	103.21 KiB	+309 B (+0.29%)	103.04 KiB	322.96 KiB	88.89 KiB	▁▁▁▁▁▁▁▁▁▁▁█
solid-start.minimal	49.79 KiB	+187 B (+0.37%)	49.66 KiB	148.19 KiB	44.19 KiB	▁▁▁▁▁▁▁▁▁▁▁█
solid-start.deferred-hydration	53.05 KiB	+189 B (+0.35%)	49.72 KiB	156.23 KiB	47.23 KiB	▁▁▁▁▁▁▁▁▁▁▁█
solid-start.full	55.09 KiB	-343 B (-0.60%)	54.96 KiB	163.98 KiB	48.75 KiB	███████████▁
vue-start.minimal	70.58 KiB	-458 B (-0.63%)	70.45 KiB	201.22 KiB	62.70 KiB	███████████▁
vue-start.full	74.55 KiB	-489 B (-0.64%)	74.42 KiB	213.84 KiB	66.11 KiB	███████████▁

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.

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commit: 270f2f9

[codspeed-hq]

Merging this PR will regress 12 benchmarks

⚠️ 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

⚡ 11 improved benchmarks
❌ 12 regressed benchmarks
✅ 157 untouched benchmarks

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Memory	mem server error-paths unmatched (react)	262.7 KB	604.3 KB	-56.53%
❌	Memory	mem server serialization-payload (vue)	3.5 MB	6.1 MB	-42.46%
❌	Memory	mem server error-paths not-found (vue)	329.3 KB	420.2 KB	-21.62%
❌	Memory	mem client navigation-churn (react)	442 KB	542.2 KB	-18.47%
❌	Memory	mem server error-paths not-found (solid)	414.9 KB	459.4 KB	-9.7%
❌	Simulation	ssr server-fn not-found (solid)	61.8 ms	66.8 ms	-7.5%
❌	Memory	mem client navigation-churn (solid)	497 KB	536.2 KB	-7.3%
❌	Simulation	ssr server-fn POST (solid)	64.7 ms	69.5 ms	-6.9%
❌	Memory	mem server peak-large-page (vue)	784.5 KB	835.4 KB	-6.09%
❌	Simulation	ssr server-fn send-context (solid)	65.9 ms	69.6 ms	-5.34%
❌	Simulation	ssr server-fn GET (solid)	70.6 ms	74.3 ms	-4.88%
❌	Memory	mem server server-fn-churn (solid)	264.5 KB	274.8 KB	-3.76%
⚡	Memory	mem server server-fn-churn (vue)	4,139.7 KB	263.7 KB	×16
⚡	Memory	mem server error-paths redirect (solid)	777.5 KB	283.1 KB	×2.7
⚡	Memory	mem client unique-location-churn (solid)	598.8 KB	342.3 KB	+74.95%
⚡	Memory	mem client interrupted-navigations (react)	409.3 KB	251.6 KB	+62.66%
⚡	Memory	mem server serialization-payload (react)	5.2 MB	3.2 MB	+61.84%
⚡	Memory	mem server request-churn (react)	653 KB	498.1 KB	+31.09%
⚡	Memory	mem client interrupted-navigations (solid)	403.7 KB	340.6 KB	+18.53%
⚡	Memory	mem server error-paths redirect (vue)	351.7 KB	303.4 KB	+15.89%
...	...	...	...	...	...

ℹ️ Only the first 20 benchmarks are displayed. Go to the app to view all benchmarks.

Tip

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

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_{Comparing codex/simplify-match-loading-orchestration (270f2f9) with fix-router-core-lane-match-loader (b8204ea)}