chore: upgrade Vitest 5.0.0-beta.1

[react-server-bot]

Automated daily upgrade of Vite, Rolldown, and/or Vitest to the latest available versions.

Vitest: 4.1.5 → 5.0.0-beta.1

Updated locations

• packages/react-server/package.json — vite, rolldown
• test/package.json — vite, rolldown, vitest, @vitest/ui
• packages/rsc/package.json — vitest, @vitest/*
• packages/create-react-server/test/package.json — vitest
• package.json — all pnpm.overrides for Vite
• pnpm-lock.yaml

Smoke test

• Dev mode — hello world test passed ✅
• Build+start mode — hello world test passed ✅

[codecov-commenter]

❌ 3 Tests Failed:

Tests completed	Failed	Passed	Skipped
2199	3	2196	19

View the top 3 failed test(s) by shortest run time

__test__/deno.spec.mjs > create-react-server: deno runtime (pnpm) > preset: get-started > starts in production mode

Stack Traces | 0.00091s run time

AssertionError: production start should work: expected false to be true // Object.is equality

- Expected
+ Received

- true
+ false

 ❯ __test__/deno.spec.mjs:74:66

__test__/deno.spec.mjs > create-react-server: deno runtime (pnpm) > preset: get-started > builds the app

Stack Traces | 0.00135s run time

AssertionError: build should succeed: expected false to be true // Object.is equality

- Expected
+ Received

- true
+ false

 ❯ __test__/deno.spec.mjs:70:58

__test__/deno.spec.mjs > create-react-server: deno runtime (pnpm) > preset: get-started > dev mode starts and serves the app

Stack Traces | 0.00739s run time

AssertionError: dev mode should work: expected false to be true // Object.is equality

- Expected
+ Received

- true
+ false

 ❯ __test__/deno.spec.mjs:66:56

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[github-actions]

⚡ Flight Protocol Benchmark

Commit: 9ff8601

Serialization (renderToReadableStream)

Scenario	@lazarv/rsc	webpack	vs webpack
react: minimal element	226.5K	29.1K	🟢 +678.4%
react: shallow wide (1000)	2.2K	353	🟢 +521.5%
react: deep nested (100)	17.4K	6.2K	🟢 +183.2%
react: product list (50)	6.2K	1.9K	🟢 +218.2%
react: large table (500x10)	287	96	🟢 +199.4%
data: primitives	177.3K	38.3K	🟢 +363.0%
data: large string (100KB)	7.6K	7.1K	🟢 +7.8%
data: nested objects (20)	57.5K	26.4K	🟢 +117.8%
data: large array (10K)	115	112	🟢 +2.4%
data: Map & Set	11.1K	5.6K	🟢 +95.8%
data: Date/BigInt/Symbol	164.4K	35.5K	🟢 +363.7%
data: typed arrays	35.1K	13.1K	🟢 +168.0%
data: mixed payload	8.1K	4.1K	🟢 +97.0%

Prerender (prerender)

Scenario	@lazarv/rsc ops/s	mean
react: minimal element	258.6K	3.9 µs
react: shallow wide (1000)	2.0K	504.6 µs
react: deep nested (100)	15.8K	63.3 µs
react: product list (50)	5.8K	173.3 µs
react: large table (500x10)	271	3.69 ms
data: primitives	195.3K	5.1 µs
data: large string (100KB)	689	1.45 ms
data: nested objects (20)	57.7K	17.3 µs
data: large array (10K)	116	8.63 ms
data: Map & Set	11.3K	88.8 µs
data: Date/BigInt/Symbol	185.3K	5.4 µs
data: typed arrays	676	1.48 ms
data: mixed payload	7.6K	131.0 µs

Deserialization (createFromReadableStream)

Scenario	@lazarv/rsc	webpack	vs webpack
react: minimal element	173.6K	141.9K	🟢 +22.4%
react: shallow wide (1000)	24.1K	2.0K	🟢 +1134.4%
react: deep nested (100)	103.0K	19.4K	🟢 +431.3%
react: product list (50)	53.0K	14.8K	🟢 +257.8%
react: large table (500x10)	4.3K	2.1K	🟢 +101.9%
data: primitives	145.0K	131.4K	🟢 +10.3%
data: large string (100KB)	38.5K	31.6K	🟢 +21.8%
data: nested objects (20)	86.1K	71.0K	🟢 +21.3%
data: large array (10K)	286	262	🟢 +9.2%
data: Map & Set	17.0K	14.5K	🟢 +17.3%
data: Date/BigInt/Symbol	140.4K	111.4K	🟢 +26.1%
data: typed arrays	59.6K	46.0K	🟢 +29.7%
data: mixed payload	26.3K	14.6K	🟢 +80.9%

Roundtrip (serialize + deserialize)

Scenario	@lazarv/rsc	webpack	vs webpack
react: minimal element	106.8K	22.0K	🟢 +385.2%
react: shallow wide (1000)	1.7K	294	🟢 +491.0%
react: deep nested (100)	14.5K	4.3K	🟢 +236.7%
react: product list (50)	5.3K	1.6K	🟢 +222.1%
react: large table (500x10)	271	84	🟢 +224.8%
data: primitives	84.8K	30.4K	🟢 +179.1%
data: large string (100KB)	6.7K	6.5K	🟢 +2.5%
data: nested objects (20)	34.2K	18.6K	🟢 +84.0%
data: large array (10K)	85	78	🟢 +8.5%
data: Map & Set	6.2K	3.9K	🟢 +58.7%
data: Date/BigInt/Symbol	73.7K	24.3K	🟢 +203.1%
data: typed arrays	26.3K	11.9K	🟢 +121.4%
data: mixed payload	6.0K	3.0K	🟢 +97.8%

Legend & methodology

Indicators: 🟢 > 1% faster | 🔴 > 1% slower | ⚪ within noise margin

vs webpack: compares @lazarv/rsc against react-server-dom-webpack within the same run.
vs baseline: compares @lazarv/rsc against the previous main branch run.

Values shown are operations/second (higher is better). Each scenario runs for at least 100 iterations with warmup.

Benchmarks run on GitHub Actions runners (shared infrastructure) — expect ~5% variance between runs. Consistent directional changes across multiple scenarios are more meaningful than any single number.

[github-actions]

⚡ Benchmark Results

	PR 4cb42be	main 280f54e
Config	50 connections, 10s/test	50 connections, 10s/test

Benchmark	Req/s	vs main	Avg Latency	vs main	P99 Latency	Throughput
minimal	1447	🟢 +11.6%	34.01 ms	🟢 -10.6%	75 ms	1.0 MB/s
small	1479	🟢 +6.4%	33.22 ms	🟢 -6.0%	66 ms	1.5 MB/s
medium	392	🔴 -3.5%	125.84 ms	🔴 +3.1%	171 ms	5.8 MB/s
large	44	🔴 -6.0%	1041.72 ms	🔴 +2.4%	2001 ms	4.5 MB/s
deep	911	🟢 +3.2%	54.29 ms	🟢 -3.1%	91 ms	3.1 MB/s
wide	67	🔴 -2.3%	719.13 ms	⚪ +0.3%	1291 ms	3.7 MB/s
cached	3204	🔴 -8.5%	15.14 ms	🔴 +9.2%	26 ms	47.1 MB/s
client-min	513	🟢 +1.8%	96.81 ms	🟢 -1.5%	164 ms	2.2 MB/s
client-small	521	🔴 -5.5%	94.72 ms	🔴 +5.2%	143 ms	2.5 MB/s
client-med	371	🔴 -5.1%	133.29 ms	🔴 +5.9%	197 ms	6.8 MB/s
client-large	76	🔴 -7.8%	632.02 ms	🔴 +7.8%	1213 ms	7.9 MB/s
client-deep	482	🔴 -3.4%	102.41 ms	🔴 +3.0%	159 ms	3.4 MB/s
client-wide	129	🔴 -14.2%	381.22 ms	🔴 +16.9%	671 ms	7.5 MB/s
rsc-client-large	1146	🔴 -7.3%	43.05 ms	🔴 +7.9%	65 ms	3.0 MB/s
rsc-client-wide	1193	🔴 -3.4%	41.34 ms	🔴 +3.6%	65 ms	3.1 MB/s
static-json	10598	🟢 +12.0%	4.17 ms	🟢 -11.5%	13 ms	4.4 MB/s
static-js	10618	🟢 +14.4%	4.29 ms	🟢 -10.8%	13 ms	6.3 MB/s
404-miss	6147	🟢 +13.5%	7.64 ms	🟢 -14.4%	16 ms	0.8 MB/s
hybrid-min	533	⚪ +0.8%	92.91 ms	⚪ -0.9%	165 ms	2.6 MB/s
hybrid-small	517	🟢 +3.8%	95.87 ms	🟢 -4.0%	146 ms	3.0 MB/s
hybrid-medium	255	⚪ +0.2%	193.15 ms	⚪ -0.6%	267 ms	10.9 MB/s
hybrid-large	42	⚪ 0.0%	1154.59 ms	🔴 +4.2%	2075 ms	13.5 MB/s
hybrid-deep	396	⚪ -1.0%	124.43 ms	⚪ +0.2%	179 ms	5.5 MB/s
hybrid-wide	61	🔴 -2.9%	781.65 ms	🔴 +5.4%	1412 ms	12.0 MB/s
hybrid-cached	3081	🟢 +3.9%	15.71 ms	🟢 -4.0%	30 ms	130.9 MB/s
hybrid-client-min	563	🟢 +1.2%	87.74 ms	🟢 -1.4%	131 ms	2.5 MB/s
hybrid-client-small	565	🟢 +4.5%	87.43 ms	🟢 -4.5%	133 ms	2.7 MB/s
hybrid-client-medium	402	🟢 +1.4%	122.99 ms	🟢 -1.2%	188 ms	7.5 MB/s
hybrid-client-large	78	🔴 -9.7%	618.97 ms	🔴 +12.4%	1136 ms	8.2 MB/s
hybrid-client-deep	492	🔴 -1.1%	100.99 ms	🔴 +1.7%	157 ms	3.6 MB/s
hybrid-client-wide	128	🔴 -13.3%	377.79 ms	🔴 +14.4%	719 ms	7.5 MB/s

Legend

🟢 > 1% improvement | 🔴 > 1% regression | ⚪ within noise margin

Benchmarks run on GitHub Actions runners (shared infrastructure) — expect ~5% variance between runs. Consistent directional changes across multiple routes are more meaningful than any single number.