chore: upgrade React experimental to 0.0.0-experimental-f4e0d4ed-20260429

[react-server-bot]

Automated daily upgrade of React packages to the latest experimental version.

Previous version: 0.0.0-experimental-561ed529-20260423
New version: 0.0.0-experimental-f4e0d4ed-20260429

Updated locations

• packages/react-server/package.json — react, react-dom, react-is
• package.json — all pnpm.overrides for React
• docs/ — micro-frontends MDX (en + ja) esm.sh URLs
• pnpm-lock.yaml

Smoke test

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

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Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	react-server-docs	520d2b1	May 01 2026, 06:58 AM

[github-actions]

⚡ Flight Protocol Benchmark

Commit: e34f083

Serialization (renderToReadableStream)

Scenario	@lazarv/rsc	webpack	vs webpack
react: minimal element	228.1K	30.6K	🟢 +645.3%
react: shallow wide (1000)	2.1K	350	🟢 +513.4%
react: deep nested (100)	17.3K	6.1K	🟢 +183.5%
react: product list (50)	5.5K	2.0K	🟢 +181.4%
react: large table (500x10)	286	89	🟢 +221.7%
data: primitives	175.7K	41.6K	🟢 +322.1%
data: large string (100KB)	7.0K	6.7K	🟢 +4.2%
data: nested objects (20)	58.4K	24.7K	🟢 +136.8%
data: large array (10K)	118	109	🟢 +8.2%
data: Map & Set	10.4K	5.7K	🟢 +84.0%
data: Date/BigInt/Symbol	166.0K	34.4K	🟢 +383.1%
data: typed arrays	32.7K	13.1K	🟢 +149.5%
data: mixed payload	8.0K	4.0K	🟢 +97.5%

Prerender (prerender)

Scenario	@lazarv/rsc ops/s	mean
react: minimal element	256.5K	3.9 µs
react: shallow wide (1000)	2.1K	487.7 µs
react: deep nested (100)	15.9K	62.8 µs
react: product list (50)	5.7K	175.8 µs
react: large table (500x10)	270	3.71 ms
data: primitives	193.7K	5.2 µs
data: large string (100KB)	690	1.45 ms
data: nested objects (20)	58.6K	17.1 µs
data: large array (10K)	114	8.74 ms
data: Map & Set	11.1K	90.4 µs
data: Date/BigInt/Symbol	183.0K	5.5 µs
data: typed arrays	671	1.49 ms
data: mixed payload	7.6K	131.6 µs

Deserialization (createFromReadableStream)

Scenario	@lazarv/rsc	webpack	vs webpack
react: minimal element	165.0K	140.9K	🟢 +17.1%
react: shallow wide (1000)	24.1K	1.5K	🟢 +1461.6%
react: deep nested (100)	99.2K	18.8K	🟢 +428.8%
react: product list (50)	51.6K	12.8K	🟢 +304.2%
react: large table (500x10)	4.2K	2.3K	🟢 +86.1%
data: primitives	132.8K	125.2K	🟢 +6.1%
data: large string (100KB)	39.5K	34.7K	🟢 +13.9%
data: nested objects (20)	82.7K	69.2K	🟢 +19.5%
data: large array (10K)	283	262	🟢 +8.3%
data: Map & Set	16.8K	14.4K	🟢 +16.7%
data: Date/BigInt/Symbol	136.8K	104.2K	🟢 +31.2%
data: typed arrays	52.3K	43.6K	🟢 +20.0%
data: mixed payload	26.0K	14.6K	🟢 +77.9%

Roundtrip (serialize + deserialize)

Scenario	@lazarv/rsc	webpack	vs webpack
react: minimal element	100.9K	20.9K	🟢 +383.6%
react: shallow wide (1000)	1.7K	275	🟢 +518.3%
react: deep nested (100)	14.2K	4.3K	🟢 +227.9%
react: product list (50)	5.3K	1.6K	🟢 +222.7%
react: large table (500x10)	269	84	🟢 +220.1%
data: primitives	80.3K	27.9K	🟢 +187.9%
data: large string (100KB)	6.1K	6.1K	⚪ -0.1%
data: nested objects (20)	33.1K	17.8K	🟢 +85.7%
data: large array (10K)	86	75	🟢 +14.0%
data: Map & Set	6.2K	4.0K	🟢 +56.4%
data: Date/BigInt/Symbol	69.9K	22.3K	🟢 +212.6%
data: typed arrays	25.5K	11.6K	🟢 +119.4%
data: mixed payload	5.9K	3.0K	🟢 +96.3%

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.

[codecov-commenter]

❌ 2 Tests Failed:

Tests completed	Failed	Passed	Skipped
1003	2	1001	1

View the top 2 failed test(s) by shortest run time

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

Stack Traces | 0.00141s 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: router > builds the app

Stack Traces | 0.00939s run time

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

- Expected
+ Received

- true
+ false

 ❯ __test__/deno.spec.mjs:70:58

To view more test analytics, go to the Test Analytics Dashboard
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[github-actions]

⚡ Benchmark Results

	PR 520d2b1	main 9af9b44
Config	50 connections, 10s/test	50 connections, 10s/test

Benchmark	Req/s	vs main	Avg Latency	vs main	P99 Latency	Throughput
minimal	1213	🔴 -3.0%	40.59 ms	🔴 +3.2%	76 ms	0.8 MB/s
small	1246	🔴 -3.6%	39.44 ms	🔴 +3.7%	74 ms	1.3 MB/s
medium	372	🔴 -2.9%	132.34 ms	🔴 +2.6%	195 ms	5.5 MB/s
large	46	⚪ -0.2%	1023.46 ms	🔴 +1.1%	2223 ms	4.7 MB/s
deep	819	🔴 -7.7%	60.09 ms	🔴 +8.3%	93 ms	2.8 MB/s
wide	71	🔴 -2.2%	693.32 ms	🔴 +5.9%	1250 ms	3.9 MB/s
cached	2968	🔴 -15.4%	16.33 ms	🔴 +19.6%	31 ms	43.7 MB/s
client-min	430	🔴 -5.6%	114.91 ms	🔴 +5.9%	190 ms	1.9 MB/s
client-small	445	🔴 -6.4%	111.39 ms	🔴 +7.4%	158 ms	2.1 MB/s
client-med	334	🔴 -7.2%	148.09 ms	🔴 +8.1%	219 ms	6.2 MB/s
client-large	79	🔴 -7.1%	612.44 ms	🔴 +7.0%	1308 ms	8.3 MB/s
client-deep	423	🔴 -4.0%	117 ms	🔴 +4.6%	172 ms	3.0 MB/s
client-wide	133	🔴 -5.2%	364.05 ms	🔴 +4.9%	651 ms	7.8 MB/s
rsc-client-large	1031	🔴 -4.7%	47.79 ms	🔴 +5.0%	66 ms	2.7 MB/s
rsc-client-wide	1041	🔴 -5.5%	47.33 ms	🔴 +5.9%	64 ms	2.7 MB/s
static-json	6618	🔴 -13.9%	7.1 ms	🔴 +15.8%	17 ms	2.8 MB/s
static-js	6925	🔴 -6.9%	6.71 ms	🔴 +7.4%	17 ms	8.7 MB/s
404-miss	4714	🔴 -2.7%	10.11 ms	🔴 +3.7%	22 ms	0.6 MB/s
hybrid-min	428	🔴 -5.2%	115.22 ms	🔴 +4.9%	170 ms	2.1 MB/s
hybrid-small	421	🔴 -3.1%	117.87 ms	🔴 +3.6%	180 ms	2.5 MB/s
hybrid-medium	222	🔴 -4.7%	220.83 ms	🔴 +4.9%	303 ms	9.5 MB/s
hybrid-large	40	⚪ -0.2%	1202.56 ms	🔴 +3.5%	2133 ms	12.8 MB/s
hybrid-deep	339	🔴 -5.6%	146.09 ms	🔴 +6.7%	210 ms	4.7 MB/s
hybrid-wide	61	🟢 +1.2%	807.93 ms	🔴 +3.0%	1309 ms	12.0 MB/s
hybrid-cached	2890	🔴 -3.9%	16.72 ms	🔴 +3.9%	32 ms	123.2 MB/s
hybrid-client-min	474	🔴 -1.6%	103.84 ms	🔴 +1.3%	155 ms	2.1 MB/s
hybrid-client-small	478	🟢 +1.4%	103.24 ms	🟢 -1.6%	153 ms	2.3 MB/s
hybrid-client-medium	349	🔴 -2.9%	140.88 ms	🔴 +2.5%	204 ms	6.5 MB/s
hybrid-client-large	82	🔴 -2.5%	588.26 ms	⚪ +0.9%	1067 ms	8.7 MB/s
hybrid-client-deep	441	🟢 +1.7%	112.15 ms	🟢 -1.2%	160 ms	3.2 MB/s
hybrid-client-wide	138	🔴 -2.0%	350.76 ms	⚪ +0.3%	619 ms	8.1 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.