perf(start-client-core): compact private frame decoder result keys

[Sheraff]

What changed

• Rename the private createFrameDecoder result keys from getOrCreateStream/jsonChunks to getStream/chunks.
• Update the sole production consumer and direct decoder tests in lockstep.
• Keep the existing two-property object shape, function/stream identities, property order, and public exports unchanged.

Bundle impact

Across the full 17-scenario matrix, all 11 Start scenarios improve by 4–12 B gzip and 24 B raw; all six router-only scenarios are byte-identical. Both renames also improve independently on react-start.minimal: getStream saves 6 B gzip / 16 B raw, and chunks saves 1 B gzip / 8 B raw. Brotli is mixed and documented in the evidence report.

Validation

• start-client-core frame-decoder unit suite: 19 passed
• TypeScript 5.6, 5.7, 5.8, 5.9, 6.0, and 7.0 matrices passed
• ESLint passed with no new errors
• React Start Vite/SSR client-RPC RawStream e2e: 6 passed
• Full 17-scenario bundle matrix passed
• Runtime allocation/destructure benchmark found no directional change
• Five independent bundle, runtime, API, integration, and codegen reviews approved

Detailed artifacts and attribution are recorded in RESULT-optimization-frame-decoder-compact-result.md.

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☁️ Nx Cloud last updated this comment at 2026-08-06 07:32:05 UTC

[github-actions]

🚀 Changeset Version Preview

5 package(s) bumped directly, 18 bumped as dependents.

🟩 Patch bumps

Package	Version	Reason
@tanstack/react-router	1.170.20 → 1.170.21	Changeset
@tanstack/router-core	1.171.17 → 1.171.18	Changeset
@tanstack/solid-router	1.170.20 → 1.170.21	Changeset
@tanstack/start-server-core	1.169.20 → 1.169.21	Changeset
@tanstack/vue-router	1.170.19 → 1.170.20	Changeset
@tanstack/react-start	1.168.37 → 1.168.38	Dependent
@tanstack/react-start-client	1.168.18 → 1.168.19	Dependent
@tanstack/react-start-rsc	0.1.36 → 0.1.37	Dependent
@tanstack/react-start-server	1.167.25 → 1.167.26	Dependent
@tanstack/router-cli	1.167.23 → 1.167.24	Dependent
@tanstack/router-generator	1.167.23 → 1.167.24	Dependent
@tanstack/router-plugin	1.168.25 → 1.168.26	Dependent
@tanstack/router-vite-plugin	1.167.25 → 1.167.26	Dependent
@tanstack/solid-start	1.168.36 → 1.168.37	Dependent
@tanstack/solid-start-client	1.168.18 → 1.168.19	Dependent
@tanstack/solid-start-server	1.167.25 → 1.167.26	Dependent
@tanstack/start-client-core	1.170.16 → 1.170.17	Dependent
@tanstack/start-plugin-core	1.171.28 → 1.171.29	Dependent
@tanstack/start-static-server-functions	1.167.21 → 1.167.22	Dependent
@tanstack/start-storage-context	1.167.19 → 1.167.20	Dependent
@tanstack/vue-start	1.168.35 → 1.168.36	Dependent
@tanstack/vue-start-client	1.167.21 → 1.167.22	Dependent
@tanstack/vue-start-server	1.167.25 → 1.167.26	Dependent

[github-actions]

Bundle Size Benchmarks

• Commit: bc1051ffba6b
• Measured at: 2026-08-06T03:58:03.700Z
• Baseline source: history:697ebb6ddbd4
• 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-start.minimal	100.59 KiB	-8 B (-0.01%)	100.45 KiB	312.26 KiB	87.51 KiB	███████▁▁▁▁▁
react-start.deferred-hydration	101.33 KiB	-11 B (-0.01%)	100.48 KiB	313.64 KiB	88.03 KiB	███████▁▁▁▁▁
react-start.full	103.91 KiB	-8 B (-0.01%)	103.78 KiB	322.21 KiB	90.23 KiB	███████▁▁▁▁▁
react-start.rsbuild.minimal	100.23 KiB	-9 B (-0.01%)	100.06 KiB	316.76 KiB	86.39 KiB	▁▁▁▁▂▂▂█████
react-start.rsbuild.minimal-iife	100.63 KiB	-10 B (-0.01%)	100.47 KiB	317.70 KiB	86.82 KiB	▁▁▁▁▂▂▂█████
react-start.rsbuild.full	103.56 KiB	-12 B (-0.01%)	103.39 KiB	326.85 KiB	89.19 KiB	▁▁▁▁▃▃▃█████
solid-start.minimal	48.18 KiB	-6 B (-0.01%)	48.05 KiB	142.08 KiB	42.81 KiB	███████▁▁▁▁▁
solid-start.deferred-hydration	51.44 KiB	-7 B (-0.01%)	48.10 KiB	150.12 KiB	45.83 KiB	███████▁▁▁▁▁
solid-start.full	53.42 KiB	-9 B (-0.02%)	53.29 KiB	157.82 KiB	47.33 KiB	████▆▆▆▁▁▁▁▁
vue-start.minimal	68.96 KiB	-7 B (-0.01%)	68.84 KiB	195.09 KiB	61.46 KiB	████▆▆▆▁▁▁▁▁
vue-start.full	72.93 KiB	-4 B (-0.01%)	72.80 KiB	207.60 KiB	64.78 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.

[pkg-pr-new]

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commit: b0c4ab1

[codspeed-hq]

Merging this PR will regress 4 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

⚡ 8 improved benchmarks
❌ 4 regressed benchmarks
✅ 168 untouched benchmarks

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Memory	mem server server-fn-churn (solid)	269.8 KB	3,683.3 KB	-92.68%
❌	Memory	mem server error-paths not-found (solid)	415.1 KB	784.7 KB	-47.1%
❌	Simulation	ssr server-fn during document ssr (react)	62.9 ms	66.2 ms	-5.05%
❌	Memory	mem server error-paths not-found (react)	277.7 KB	286.9 KB	-3.23%
⚡	Memory	mem server server-fn-churn (vue)	4,147.3 KB	275.8 KB	×15
⚡	Memory	mem server error-paths unmatched (vue)	2,142.1 KB	479 KB	×4.5
⚡	Memory	mem server peak-large-page (react)	1,737.5 KB	952.1 KB	+82.49%
⚡	Memory	mem server error-paths redirect (solid)	388 KB	283.5 KB	+36.87%
⚡	Memory	mem server error-paths redirect (vue)	338.6 KB	294.7 KB	+14.89%
⚡	Memory	mem server error-paths unmatched (react)	317.5 KB	296 KB	+7.27%
⚡	Memory	mem client navigation-churn (vue)	1.3 MB	1.2 MB	+3.62%
⚡	Memory	mem client navigation-churn (solid)	580.3 KB	560.9 KB	+3.44%

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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