test: enable step source-map assertions for vite local dev

[TooTallNate]

Summary

• Vite local-dev e2e tests basic step error preserves message and stack trace and cross-file step error preserves message and function names in stack have been failing consistently since #1827 bumped workbench/vite from vite@^7.1.12 to vite@^7.3.2.
• The newer vite preserves step bundle source maps in dev mode, so stack traces now point at original files (99_e2e.ts, helpers.ts). However, hasStepSourceMaps() in packages/core/e2e/utils.ts still hard-codes vite as having no step source maps in any local environment, so the assertion expect(stack).not.toContain('99_e2e.ts') fails.
• Fix: drop the vite-specific block in hasStepSourceMaps() entirely. Vite local dev now falls through to the default return true, while vite local prod is still caught by the existing !DEV_TEST_CONFIG guard further down — so local-prod behavior is unchanged.

Why this took 6 days to surface

1. The push for [workflow] Bump Vite #1827 had Local Dev tests skipped due to matrix selection at the time.
2. The next push (Lock next@canary test version #1860) introduced a CI env-var bug that prevented Local Dev tests from running at all.
3. ci: fix VERCEL_WORKFLOW_SERVER_* env var ternary on main #1859 (28dc089e) fixed the env-var bug, finally letting vite local dev run — and it surfaced this assertion failure.

Reference failing run: https://github.com/vercel/workflow/actions/runs/25067758534/job/73444472541

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[changeset-bot]

🦋 Changeset detected

Latest commit: 072a4d0

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

This PR includes changesets to release 0 packages

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🧪 E2E Test Results

✅ All tests passed

Summary

	Passed	Failed	Skipped	Total
✅ ▲ Vercel Production	978	0	67	1045
✅ 💻 Local Development	1054	0	86	1140
✅ 📦 Local Production	1054	0	86	1140
✅ 🐘 Local Postgres	1054	0	86	1140
✅ 🪟 Windows	95	0	0	95
✅ 📋 Other	267	0	18	285
Total	4502	0	343	4845

Details by Category

✅ ▲ Vercel Production

App	Passed	Failed	Skipped
✅ astro	88	0	7
✅ example	88	0	7
✅ express	88	0	7
✅ fastify	88	0	7
✅ hono	88	0	7
✅ nextjs-turbopack	93	0	2
✅ nextjs-webpack	93	0	2
✅ nitro	88	0	7
✅ nuxt	88	0	7
✅ sveltekit	88	0	7
✅ vite	88	0	7

✅ 💻 Local Development

App	Passed	Failed	Skipped
✅ astro-stable	89	0	6
✅ express-stable	89	0	6
✅ fastify-stable	89	0	6
✅ hono-stable	89	0	6
✅ nextjs-turbopack-canary	76	0	19
✅ nextjs-turbopack-stable	95	0	0
✅ nextjs-webpack-canary	76	0	19
✅ nextjs-webpack-stable	95	0	0
✅ nitro-stable	89	0	6
✅ nuxt-stable	89	0	6
✅ sveltekit-stable	89	0	6
✅ vite-stable	89	0	6

✅ 📦 Local Production

App	Passed	Failed	Skipped
✅ astro-stable	89	0	6
✅ express-stable	89	0	6
✅ fastify-stable	89	0	6
✅ hono-stable	89	0	6
✅ nextjs-turbopack-canary	76	0	19
✅ nextjs-turbopack-stable	95	0	0
✅ nextjs-webpack-canary	76	0	19
✅ nextjs-webpack-stable	95	0	0
✅ nitro-stable	89	0	6
✅ nuxt-stable	89	0	6
✅ sveltekit-stable	89	0	6
✅ vite-stable	89	0	6

✅ 🐘 Local Postgres

App	Passed	Failed	Skipped
✅ astro-stable	89	0	6
✅ express-stable	89	0	6
✅ fastify-stable	89	0	6
✅ hono-stable	89	0	6
✅ nextjs-turbopack-canary	76	0	19
✅ nextjs-turbopack-stable	95	0	0
✅ nextjs-webpack-canary	76	0	19
✅ nextjs-webpack-stable	95	0	0
✅ nitro-stable	89	0	6
✅ nuxt-stable	89	0	6
✅ sveltekit-stable	89	0	6
✅ vite-stable	89	0	6

✅ 🪟 Windows

App	Passed	Failed	Skipped
✅ nextjs-turbopack	95	0	0

✅ 📋 Other

App	Passed	Failed	Skipped
✅ e2e-local-dev-nest-stable	89	0	6
✅ e2e-local-postgres-nest-stable	89	0	6
✅ e2e-local-prod-nest-stable	89	0	6

---

📋 View full workflow run

[github-actions]

📊 Benchmark Results

📈 Comparing against baseline from main branch. Green 🟢 = faster, Red 🔺 = slower.

workflow with no steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Express	0.040s (-9.3% 🟢)	1.005s (~)	0.965s	10	1.00x
💻 Local	Nitro	0.046s (+6.7% 🔺)	1.005s (~)	0.959s	10	1.14x
🐘 Postgres	Nitro	0.049s (-48.3% 🟢)	1.011s (-3.1%)	0.961s	10	1.22x
💻 Local	Next.js (Turbopack)	0.051s	1.005s	0.954s	10	1.27x
🐘 Postgres	Express	0.053s (-8.4% 🟢)	1.012s (~)	0.959s	10	1.32x
🐘 Postgres	Next.js (Turbopack)	0.057s	1.009s	0.952s	10	1.42x

workflow with 1 step

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Next.js (Turbopack)	1.120s	2.005s	0.886s	10	1.00x
💻 Local	Express	1.127s (~)	2.005s (~)	0.878s	10	1.01x
🐘 Postgres	Nitro	1.128s (-1.1%)	2.008s (~)	0.880s	10	1.01x
💻 Local	Nitro	1.137s (+0.5%)	2.006s (~)	0.869s	10	1.02x
🐘 Postgres	Express	1.144s (~)	2.010s (~)	0.867s	10	1.02x
🐘 Postgres	Next.js (Turbopack)	1.150s	2.012s	0.862s	10	1.03x

workflow with 10 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	10.770s (-0.9%)	11.023s (~)	0.253s	3	1.00x
🐘 Postgres	Express	10.787s (-1.6%)	11.025s (~)	0.238s	3	1.00x
💻 Local	Next.js (Turbopack)	10.789s	11.024s	0.235s	3	1.00x
🐘 Postgres	Next.js (Turbopack)	10.879s	11.025s	0.146s	3	1.01x
💻 Local	Express	10.922s (~)	11.023s (~)	0.100s	3	1.01x
💻 Local	Nitro	10.955s (~)	11.024s (~)	0.069s	3	1.02x

workflow with 25 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	14.344s (-1.6%)	15.034s (~)	0.691s	4	1.00x
🐘 Postgres	Next.js (Turbopack)	14.467s	15.023s	0.556s	4	1.01x
💻 Local	Next.js (Turbopack)	14.720s	15.030s	0.310s	4	1.03x
🐘 Postgres	Nitro	14.789s (+1.3%)	15.529s (+3.3%)	0.740s	4	1.03x
💻 Local	Express	14.980s (~)	15.029s (~)	0.049s	4	1.04x
💻 Local	Nitro	15.104s (~)	16.033s (~)	0.929s	4	1.05x

workflow with 50 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	13.522s (-3.5%)	14.029s (-3.9%)	0.507s	7	1.00x
🐘 Postgres	Next.js (Turbopack)	13.921s	14.022s	0.101s	7	1.03x
🐘 Postgres	Nitro	14.610s (+4.6%)	15.355s (+7.3% 🔺)	0.745s	6	1.08x
💻 Local	Next.js (Turbopack)	16.229s	17.032s	0.803s	6	1.20x
💻 Local	Express	16.828s (+1.4%)	17.198s (+1.0%)	0.370s	6	1.24x
💻 Local	Nitro	16.921s (+0.8%)	17.032s (~)	0.111s	6	1.25x

Promise.all with 10 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	1.203s (-5.6% 🟢)	2.010s (~)	0.807s	15	1.00x
🐘 Postgres	Next.js (Turbopack)	1.233s	2.010s	0.777s	15	1.03x
🐘 Postgres	Express	1.234s (-2.1%)	2.011s (~)	0.777s	15	1.03x
💻 Local	Next.js (Turbopack)	1.509s	2.006s	0.497s	15	1.25x
💻 Local	Express	1.526s (+2.5%)	2.006s (~)	0.480s	15	1.27x
💻 Local	Nitro	1.561s (-4.3%)	2.006s (-3.3%)	0.445s	15	1.30x

Promise.all with 25 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	2.304s (-2.0%)	3.026s (+0.6%)	0.722s	10	1.00x
🐘 Postgres	Express	2.376s (+0.6%)	3.011s (~)	0.635s	10	1.03x
🐘 Postgres	Next.js (Turbopack)	2.406s	3.009s	0.603s	10	1.04x
💻 Local	Next.js (Turbopack)	2.809s	3.454s	0.645s	9	1.22x
💻 Local	Nitro	3.045s (-3.1%)	3.453s (-11.1% 🟢)	0.407s	9	1.32x
💻 Local	Express	3.066s (+3.8%)	3.885s (+12.5% 🔺)	0.819s	8	1.33x

Promise.all with 50 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	3.494s (~)	4.014s (~)	0.520s	8	1.00x
🐘 Postgres	Nitro	3.496s (~)	4.026s (~)	0.530s	8	1.00x
🐘 Postgres	Next.js (Turbopack)	3.682s	4.011s	0.329s	8	1.05x
💻 Local	Next.js (Turbopack)	7.885s	8.519s	0.634s	4	2.26x
💻 Local	Express	8.294s (-0.5%)	9.022s (~)	0.728s	4	2.37x
💻 Local	Nitro	9.038s (+8.2% 🔺)	9.522s (+5.6% 🔺)	0.485s	4	2.59x

Promise.race with 10 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	1.206s (-4.0%)	2.007s (~)	0.801s	15	1.00x
🐘 Postgres	Next.js (Turbopack)	1.239s	2.010s	0.771s	15	1.03x
🐘 Postgres	Express	1.247s (-0.8%)	2.010s (~)	0.763s	15	1.03x
💻 Local	Next.js (Turbopack)	1.520s	2.006s	0.486s	15	1.26x
💻 Local	Nitro	1.566s (-16.1% 🟢)	2.006s (-14.3% 🟢)	0.440s	15	1.30x
💻 Local	Express	1.678s (-11.4% 🟢)	2.222s (-6.0% 🟢)	0.544s	14	1.39x

Promise.race with 25 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	2.270s (-3.0%)	3.007s (~)	0.737s	10	1.00x
🐘 Postgres	Express	2.342s (~)	3.009s (~)	0.667s	10	1.03x
🐘 Postgres	Next.js (Turbopack)	2.402s	3.010s	0.608s	10	1.06x
💻 Local	Next.js (Turbopack)	2.983s	3.760s	0.776s	8	1.31x
💻 Local	Nitro	3.004s (-2.0%)	3.760s (-3.3%)	0.756s	8	1.32x
💻 Local	Express	3.144s (~)	4.010s (+6.6% 🔺)	0.866s	8	1.39x

Promise.race with 50 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	3.416s (-1.9%)	4.008s (~)	0.593s	8	1.00x
🐘 Postgres	Express	3.448s (-1.5%)	4.011s (~)	0.563s	8	1.01x
🐘 Postgres	Next.js (Turbopack)	3.649s	4.014s	0.365s	8	1.07x
💻 Local	Next.js (Turbopack)	8.305s	9.021s	0.716s	4	2.43x
💻 Local	Express	8.866s (+0.7%)	9.273s (~)	0.406s	4	2.60x
💻 Local	Nitro	9.213s (+0.8%)	9.772s (-2.5%)	0.559s	4	2.70x

workflow with 10 sequential data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	0.714s (-15.0% 🟢)	1.007s (-1.6%)	0.293s	60	1.00x
🐘 Postgres	Next.js (Turbopack)	0.781s	1.006s	0.226s	60	1.09x
💻 Local	Next.js (Turbopack)	0.890s	1.039s	0.149s	58	1.25x
🐘 Postgres	Nitro	0.982s (+19.7% 🔺)	1.346s (+33.7% 🔺)	0.363s	45	1.38x
💻 Local	Nitro	1.014s (+3.4%)	1.720s (+57.2% 🔺)	0.706s	35	1.42x
💻 Local	Express	1.128s (+14.6% 🔺)	1.570s (+45.9% 🔺)	0.442s	39	1.58x

workflow with 25 sequential data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	1.698s (-14.1% 🟢)	2.009s (-11.0% 🟢)	0.311s	45	1.00x
🐘 Postgres	Nitro	1.728s (-10.3% 🟢)	2.100s (~)	0.372s	43	1.02x
🐘 Postgres	Next.js (Turbopack)	1.932s	2.173s	0.241s	42	1.14x
💻 Local	Next.js (Turbopack)	2.943s	3.223s	0.280s	28	1.73x
💻 Local	Express	3.035s (+0.6%)	3.586s (~)	0.550s	26	1.79x
💻 Local	Nitro	3.041s (~)	3.843s (+2.3%)	0.803s	24	1.79x

workflow with 50 sequential data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	3.431s (-16.4% 🟢)	4.108s (-10.8% 🟢)	0.678s	30	1.00x
🐘 Postgres	Express	3.498s (-12.3% 🟢)	4.012s (-8.2% 🟢)	0.514s	30	1.02x
🐘 Postgres	Next.js (Turbopack)	3.864s	4.045s	0.181s	30	1.13x
💻 Local	Next.js (Turbopack)	8.870s	9.161s	0.291s	14	2.59x
💻 Local	Nitro	9.175s (-1.3%)	9.787s (-2.3%)	0.613s	13	2.67x
💻 Local	Express	9.295s (+0.9%)	9.941s (-0.8%)	0.646s	13	2.71x

workflow with 10 concurrent data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	0.244s (-13.9% 🟢)	1.007s (~)	0.764s	60	1.00x
🐘 Postgres	Next.js (Turbopack)	0.248s	1.007s	0.759s	60	1.02x
🐘 Postgres	Express	0.261s (-7.6% 🟢)	1.008s (~)	0.747s	60	1.07x
💻 Local	Express	0.595s (+6.1% 🔺)	1.005s (~)	0.410s	60	2.44x
💻 Local	Nitro	0.599s (-1.0%)	1.005s (-1.6%)	0.406s	60	2.46x
💻 Local	Next.js (Turbopack)	0.607s	1.022s	0.415s	59	2.49x

workflow with 25 concurrent data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	0.409s (-19.7% 🟢)	1.007s (~)	0.598s	90	1.00x
🐘 Postgres	Nitro	0.426s (-14.1% 🟢)	1.009s (~)	0.583s	90	1.04x
🐘 Postgres	Next.js (Turbopack)	0.504s	1.007s	0.503s	90	1.23x
💻 Local	Nitro	2.548s (~)	3.009s (~)	0.461s	30	6.23x
💻 Local	Next.js (Turbopack)	2.681s	3.009s	0.328s	30	6.55x
💻 Local	Express	2.844s (+13.1% 🔺)	3.472s (+15.4% 🔺)	0.629s	26	6.95x

workflow with 50 concurrent data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	0.654s (-20.1% 🟢)	1.016s (~)	0.362s	119	1.00x
🐘 Postgres	Nitro	0.657s (-16.8% 🟢)	1.054s (+4.7%)	0.397s	114	1.01x
🐘 Postgres	Next.js (Turbopack)	0.820s	1.016s	0.196s	119	1.25x
💻 Local	Nitro	11.257s (+0.6%)	11.938s (+2.3%)	0.681s	11	17.21x
💻 Local	Next.js (Turbopack)	11.270s	11.847s	0.577s	11	17.23x
💻 Local	Express	12.606s (+12.7% 🔺)	13.033s (+9.1% 🔺)	0.426s	10	19.28x

Stream Benchmarks(includes TTFB metrics)

workflow with stream

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Next.js (Turbopack)	0.180s	1.002s	0.013s	1.019s	0.839s	10	1.00x
🐘 Postgres	Next.js (Turbopack)	0.198s	1.000s	0.001s	1.010s	0.812s	10	1.10x
💻 Local	Express	0.201s (+0.8%)	1.005s (~)	0.012s (-0.8%)	1.018s (~)	0.818s	10	1.12x
💻 Local	Nitro	0.209s (-2.2%)	1.004s (~)	0.013s (+3.2%)	1.019s (~)	0.810s	10	1.16x
🐘 Postgres	Express	0.255s (+24.3% 🔺)	1.000s (~)	0.045s (+2712.5% 🔺)	1.056s (+4.4%)	0.801s	10	1.42x
🐘 Postgres	Nitro	0.330s (+60.9% 🔺)	1.008s (+0.8%)	0.124s (+8166.7% 🔺)	1.159s (+14.6% 🔺)	0.829s	10	1.84x

stream pipeline with 5 transform steps (1MB)

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	0.585s (-6.3% 🟢)	1.040s (+3.3%)	0.032s (+667.7% 🔺)	1.083s (+5.9% 🔺)	0.499s	56	1.00x
🐘 Postgres	Express	0.600s (-4.7%)	1.008s (~)	0.005s (+32.7% 🔺)	1.025s (~)	0.425s	59	1.03x
🐘 Postgres	Next.js (Turbopack)	0.650s	1.026s	0.007s	1.042s	0.392s	58	1.11x
💻 Local	Next.js (Turbopack)	0.680s	1.011s	0.009s	1.023s	0.343s	59	1.16x
💻 Local	Express	0.825s (+8.9% 🔺)	1.013s (-1.5%)	0.015s (+59.3% 🔺)	1.030s (-0.9%)	0.206s	59	1.41x
💻 Local	Nitro	0.847s (+0.9%)	1.012s (~)	0.010s (+4.2%)	1.116s (~)	0.269s	54	1.45x

10 parallel streams (1MB each)

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Next.js (Turbopack)	0.965s	1.250s	0.000s	1.264s	0.299s	48	1.00x
🐘 Postgres	Express	1.015s (+5.6% 🔺)	1.463s (+14.5% 🔺)	0.000s (-43.9% 🟢)	1.478s (+13.1% 🔺)	0.463s	41	1.05x
🐘 Postgres	Nitro	1.144s (+18.1% 🔺)	1.461s (+17.1% 🔺)	0.000s (-41.5% 🟢)	1.481s (+17.7% 🔺)	0.336s	41	1.19x
💻 Local	Nitro	1.252s (+2.4%)	2.022s (~)	0.000s (+266.7% 🔺)	2.024s (~)	0.772s	30	1.30x
💻 Local	Next.js (Turbopack)	1.309s	2.020s	0.000s	2.023s	0.714s	30	1.36x
💻 Local	Express	1.374s (+12.2% 🔺)	2.022s (~)	0.001s (+60.0% 🔺)	2.025s (~)	0.651s	30	1.42x

fan-out fan-in 10 streams (1MB each)

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	1.888s (+6.5% 🔺)	2.312s (+6.2% 🔺)	0.000s (NaN%)	2.331s (+6.0% 🔺)	0.443s	26	1.00x
🐘 Postgres	Next.js (Turbopack)	1.890s	2.146s	0.000s	2.153s	0.264s	28	1.00x
🐘 Postgres	Nitro	1.917s (+7.0% 🔺)	2.465s (+15.1% 🔺)	0.000s (-100.0% 🟢)	2.532s (+16.4% 🔺)	0.615s	25	1.02x
💻 Local	Next.js (Turbopack)	3.662s	4.032s	0.001s	4.038s	0.376s	15	1.94x
💻 Local	Nitro	3.709s (+9.5% 🔺)	4.234s (+5.0% 🔺)	0.000s (-25.0% 🟢)	4.236s (+5.0%)	0.528s	15	1.96x
💻 Local	Express	4.304s (+24.1% 🔺)	4.423s (+9.7% 🔺)	0.000s (-42.3% 🟢)	4.812s (+19.2% 🔺)	0.507s	13	2.28x

Summary

Fastest Framework by World

Winner determined by most benchmark wins

World	🥇 Fastest Framework	Wins
💻 Local	Next.js (Turbopack)	16/21
🐘 Postgres	Nitro	11/21

Fastest World by Framework

Winner determined by most benchmark wins

Framework	🥇 Fastest World	Wins
Express	🐘 Postgres	18/21
Next.js (Turbopack)	🐘 Postgres	17/21
Nitro	🐘 Postgres	19/21

Column Definitions

• Workflow Time: Runtime reported by workflow (completedAt - createdAt) - primary metric
• TTFB: Time to First Byte - time from workflow start until first stream byte received (stream benchmarks only)
• Slurp: Time from first byte to complete stream consumption (stream benchmarks only)
• Wall Time: Total testbench time (trigger workflow + poll for result)
• Overhead: Testbench overhead (Wall Time - Workflow Time)
• Samples: Number of benchmark iterations run
• vs Fastest: How much slower compared to the fastest configuration for this benchmark

Worlds:

• 💻 Local: In-memory filesystem world (local development)
• 🐘 Postgres: PostgreSQL database world (local development)
• ▲ Vercel: Vercel production/preview deployment
• 🌐 Turso: Community world (local development)
• 🌐 MongoDB: Community world (local development)
• 🌐 Redis: Community world (local development)
• 🌐 Jazz: Community world (local development)

---

📋 View full workflow run

[Copilot]

Pull request overview

Adjusts the e2e “step error preserves stack trace” assertions for Vite local dev after the Vite upgrade started preserving step bundle source maps in dev mode.

Changes:

• Update hasStepSourceMaps() to allow Vite local dev to assert original source filenames in stacks (while keeping local prod behavior unchanged).
• Add an (empty) changeset note documenting the Vite local-dev e2e fix.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
packages/core/e2e/utils.ts	Refines step sourcemap support matrix so Vite local dev no longer disables stack source assertions.
.changeset/fix-vite-step-source-maps-e2e.md	Documents the reason for the Vite local-dev e2e assertion change.

---

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[TooTallNate]

Summary

• Vite local-dev e2e tests basic step error preserves message and stack trace and cross-file step error preserves message and function names in stack have been failing consistently since #1827 bumped workbench/vite from vite@^7.1.12 to vite@^7.3.2.
• The newer vite preserves step bundle source maps in dev mode, so stack traces now point at original files (99_e2e.ts, helpers.ts). However, hasStepSourceMaps() in packages/core/e2e/utils.ts still hard-codes vite as having no step source maps in any local environment, so the assertion expect(stack).not.toContain('99_e2e.ts') fails.
• Fix: drop the vite-specific block in hasStepSourceMaps() entirely. Vite local dev now falls through to the default return true, while vite local prod is still caught by the existing !DEV_TEST_CONFIG guard further down — so local-prod behavior is unchanged.

Why this took 6 days to surface

1. The push for [workflow] Bump Vite #1827 had Local Dev tests skipped due to matrix selection at the time.
2. The next push (Lock next@canary test version #1860) introduced a CI env-var bug that prevented Local Dev tests from running at all.
3. ci: fix VERCEL_WORKFLOW_SERVER_* env var ternary on main #1859 (28dc089e) fixed the env-var bug, finally letting vite local dev run — and it surfaced this assertion failure.

Reference failing run: https://github.com/vercel/workflow/actions/runs/25067758534/job/73444472541

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
example-nextjs-workflow-turbopack	Ready	Preview, Comment	Apr 28, 2026 7:01pm
example-nextjs-workflow-webpack	Ready	Preview, Comment	Apr 28, 2026 7:01pm
example-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-astro-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-express-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-fastify-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-hono-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-nitro-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-nuxt-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-sveltekit-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-vite-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workflow-docs	Ready	Preview, Comment, Open in v0	Apr 28, 2026 7:01pm
workflow-swc-playground	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workflow-web	Ready	Preview, Comment	Apr 28, 2026 7:01pm

[changeset-bot]

🦋 Changeset detected

Latest commit: 072a4d0

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

This PR includes changesets to release 0 packages

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions]

🧪 E2E Test Results

✅ All tests passed

Summary

	Passed	Failed	Skipped	Total
✅ ▲ Vercel Production	978	0	67	1045
✅ 💻 Local Development	1054	0	86	1140
✅ 📦 Local Production	1054	0	86	1140
✅ 🐘 Local Postgres	1054	0	86	1140
✅ 🪟 Windows	95	0	0	95
✅ 📋 Other	267	0	18	285
Total	4502	0	343	4845

Details by Category

✅ ▲ Vercel Production

App	Passed	Failed	Skipped
✅ astro	88	0	7
✅ example	88	0	7
✅ express	88	0	7
✅ fastify	88	0	7
✅ hono	88	0	7
✅ nextjs-turbopack	93	0	2
✅ nextjs-webpack	93	0	2
✅ nitro	88	0	7
✅ nuxt	88	0	7
✅ sveltekit	88	0	7
✅ vite	88	0	7

✅ 💻 Local Development

App	Passed	Failed	Skipped
✅ astro-stable	89	0	6
✅ express-stable	89	0	6
✅ fastify-stable	89	0	6
✅ hono-stable	89	0	6
✅ nextjs-turbopack-canary	76	0	19
✅ nextjs-turbopack-stable	95	0	0
✅ nextjs-webpack-canary	76	0	19
✅ nextjs-webpack-stable	95	0	0
✅ nitro-stable	89	0	6
✅ nuxt-stable	89	0	6
✅ sveltekit-stable	89	0	6
✅ vite-stable	89	0	6

✅ 📦 Local Production

App	Passed	Failed	Skipped
✅ astro-stable	89	0	6
✅ express-stable	89	0	6
✅ fastify-stable	89	0	6
✅ hono-stable	89	0	6
✅ nextjs-turbopack-canary	76	0	19
✅ nextjs-turbopack-stable	95	0	0
✅ nextjs-webpack-canary	76	0	19
✅ nextjs-webpack-stable	95	0	0
✅ nitro-stable	89	0	6
✅ nuxt-stable	89	0	6
✅ sveltekit-stable	89	0	6
✅ vite-stable	89	0	6

✅ 🐘 Local Postgres

App	Passed	Failed	Skipped
✅ astro-stable	89	0	6
✅ express-stable	89	0	6
✅ fastify-stable	89	0	6
✅ hono-stable	89	0	6
✅ nextjs-turbopack-canary	76	0	19
✅ nextjs-turbopack-stable	95	0	0
✅ nextjs-webpack-canary	76	0	19
✅ nextjs-webpack-stable	95	0	0
✅ nitro-stable	89	0	6
✅ nuxt-stable	89	0	6
✅ sveltekit-stable	89	0	6
✅ vite-stable	89	0	6

✅ 🪟 Windows

App	Passed	Failed	Skipped
✅ nextjs-turbopack	95	0	0

✅ 📋 Other

App	Passed	Failed	Skipped
✅ e2e-local-dev-nest-stable	89	0	6
✅ e2e-local-postgres-nest-stable	89	0	6
✅ e2e-local-prod-nest-stable	89	0	6

---

📋 View full workflow run

[github-actions]

📊 Benchmark Results

📈 Comparing against baseline from main branch. Green 🟢 = faster, Red 🔺 = slower.

workflow with no steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Express	0.040s (-9.3% 🟢)	1.005s (~)	0.965s	10	1.00x
💻 Local	Nitro	0.046s (+6.7% 🔺)	1.005s (~)	0.959s	10	1.14x
🐘 Postgres	Nitro	0.049s (-48.3% 🟢)	1.011s (-3.1%)	0.961s	10	1.22x
💻 Local	Next.js (Turbopack)	0.051s	1.005s	0.954s	10	1.27x
🐘 Postgres	Express	0.053s (-8.4% 🟢)	1.012s (~)	0.959s	10	1.32x
🐘 Postgres	Next.js (Turbopack)	0.057s	1.009s	0.952s	10	1.42x

workflow with 1 step

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Next.js (Turbopack)	1.120s	2.005s	0.886s	10	1.00x
💻 Local	Express	1.127s (~)	2.005s (~)	0.878s	10	1.01x
🐘 Postgres	Nitro	1.128s (-1.1%)	2.008s (~)	0.880s	10	1.01x
💻 Local	Nitro	1.137s (+0.5%)	2.006s (~)	0.869s	10	1.02x
🐘 Postgres	Express	1.144s (~)	2.010s (~)	0.867s	10	1.02x
🐘 Postgres	Next.js (Turbopack)	1.150s	2.012s	0.862s	10	1.03x

workflow with 10 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	10.770s (-0.9%)	11.023s (~)	0.253s	3	1.00x
🐘 Postgres	Express	10.787s (-1.6%)	11.025s (~)	0.238s	3	1.00x
💻 Local	Next.js (Turbopack)	10.789s	11.024s	0.235s	3	1.00x
🐘 Postgres	Next.js (Turbopack)	10.879s	11.025s	0.146s	3	1.01x
💻 Local	Express	10.922s (~)	11.023s (~)	0.100s	3	1.01x
💻 Local	Nitro	10.955s (~)	11.024s (~)	0.069s	3	1.02x

workflow with 25 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	14.344s (-1.6%)	15.034s (~)	0.691s	4	1.00x
🐘 Postgres	Next.js (Turbopack)	14.467s	15.023s	0.556s	4	1.01x
💻 Local	Next.js (Turbopack)	14.720s	15.030s	0.310s	4	1.03x
🐘 Postgres	Nitro	14.789s (+1.3%)	15.529s (+3.3%)	0.740s	4	1.03x
💻 Local	Express	14.980s (~)	15.029s (~)	0.049s	4	1.04x
💻 Local	Nitro	15.104s (~)	16.033s (~)	0.929s	4	1.05x

workflow with 50 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	13.522s (-3.5%)	14.029s (-3.9%)	0.507s	7	1.00x
🐘 Postgres	Next.js (Turbopack)	13.921s	14.022s	0.101s	7	1.03x
🐘 Postgres	Nitro	14.610s (+4.6%)	15.355s (+7.3% 🔺)	0.745s	6	1.08x
💻 Local	Next.js (Turbopack)	16.229s	17.032s	0.803s	6	1.20x
💻 Local	Express	16.828s (+1.4%)	17.198s (+1.0%)	0.370s	6	1.24x
💻 Local	Nitro	16.921s (+0.8%)	17.032s (~)	0.111s	6	1.25x

Promise.all with 10 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	1.203s (-5.6% 🟢)	2.010s (~)	0.807s	15	1.00x
🐘 Postgres	Next.js (Turbopack)	1.233s	2.010s	0.777s	15	1.03x
🐘 Postgres	Express	1.234s (-2.1%)	2.011s (~)	0.777s	15	1.03x
💻 Local	Next.js (Turbopack)	1.509s	2.006s	0.497s	15	1.25x
💻 Local	Express	1.526s (+2.5%)	2.006s (~)	0.480s	15	1.27x
💻 Local	Nitro	1.561s (-4.3%)	2.006s (-3.3%)	0.445s	15	1.30x

Promise.all with 25 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	2.304s (-2.0%)	3.026s (+0.6%)	0.722s	10	1.00x
🐘 Postgres	Express	2.376s (+0.6%)	3.011s (~)	0.635s	10	1.03x
🐘 Postgres	Next.js (Turbopack)	2.406s	3.009s	0.603s	10	1.04x
💻 Local	Next.js (Turbopack)	2.809s	3.454s	0.645s	9	1.22x
💻 Local	Nitro	3.045s (-3.1%)	3.453s (-11.1% 🟢)	0.407s	9	1.32x
💻 Local	Express	3.066s (+3.8%)	3.885s (+12.5% 🔺)	0.819s	8	1.33x

Promise.all with 50 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	3.494s (~)	4.014s (~)	0.520s	8	1.00x
🐘 Postgres	Nitro	3.496s (~)	4.026s (~)	0.530s	8	1.00x
🐘 Postgres	Next.js (Turbopack)	3.682s	4.011s	0.329s	8	1.05x
💻 Local	Next.js (Turbopack)	7.885s	8.519s	0.634s	4	2.26x
💻 Local	Express	8.294s (-0.5%)	9.022s (~)	0.728s	4	2.37x
💻 Local	Nitro	9.038s (+8.2% 🔺)	9.522s (+5.6% 🔺)	0.485s	4	2.59x

Promise.race with 10 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	1.206s (-4.0%)	2.007s (~)	0.801s	15	1.00x
🐘 Postgres	Next.js (Turbopack)	1.239s	2.010s	0.771s	15	1.03x
🐘 Postgres	Express	1.247s (-0.8%)	2.010s (~)	0.763s	15	1.03x
💻 Local	Next.js (Turbopack)	1.520s	2.006s	0.486s	15	1.26x
💻 Local	Nitro	1.566s (-16.1% 🟢)	2.006s (-14.3% 🟢)	0.440s	15	1.30x
💻 Local	Express	1.678s (-11.4% 🟢)	2.222s (-6.0% 🟢)	0.544s	14	1.39x

Promise.race with 25 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	2.270s (-3.0%)	3.007s (~)	0.737s	10	1.00x
🐘 Postgres	Express	2.342s (~)	3.009s (~)	0.667s	10	1.03x
🐘 Postgres	Next.js (Turbopack)	2.402s	3.010s	0.608s	10	1.06x
💻 Local	Next.js (Turbopack)	2.983s	3.760s	0.776s	8	1.31x
💻 Local	Nitro	3.004s (-2.0%)	3.760s (-3.3%)	0.756s	8	1.32x
💻 Local	Express	3.144s (~)	4.010s (+6.6% 🔺)	0.866s	8	1.39x

Promise.race with 50 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	3.416s (-1.9%)	4.008s (~)	0.593s	8	1.00x
🐘 Postgres	Express	3.448s (-1.5%)	4.011s (~)	0.563s	8	1.01x
🐘 Postgres	Next.js (Turbopack)	3.649s	4.014s	0.365s	8	1.07x
💻 Local	Next.js (Turbopack)	8.305s	9.021s	0.716s	4	2.43x
💻 Local	Express	8.866s (+0.7%)	9.273s (~)	0.406s	4	2.60x
💻 Local	Nitro	9.213s (+0.8%)	9.772s (-2.5%)	0.559s	4	2.70x

workflow with 10 sequential data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	0.714s (-15.0% 🟢)	1.007s (-1.6%)	0.293s	60	1.00x
🐘 Postgres	Next.js (Turbopack)	0.781s	1.006s	0.226s	60	1.09x
💻 Local	Next.js (Turbopack)	0.890s	1.039s	0.149s	58	1.25x
🐘 Postgres	Nitro	0.982s (+19.7% 🔺)	1.346s (+33.7% 🔺)	0.363s	45	1.38x
💻 Local	Nitro	1.014s (+3.4%)	1.720s (+57.2% 🔺)	0.706s	35	1.42x
💻 Local	Express	1.128s (+14.6% 🔺)	1.570s (+45.9% 🔺)	0.442s	39	1.58x

workflow with 25 sequential data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	1.698s (-14.1% 🟢)	2.009s (-11.0% 🟢)	0.311s	45	1.00x
🐘 Postgres	Nitro	1.728s (-10.3% 🟢)	2.100s (~)	0.372s	43	1.02x
🐘 Postgres	Next.js (Turbopack)	1.932s	2.173s	0.241s	42	1.14x
💻 Local	Next.js (Turbopack)	2.943s	3.223s	0.280s	28	1.73x
💻 Local	Express	3.035s (+0.6%)	3.586s (~)	0.550s	26	1.79x
💻 Local	Nitro	3.041s (~)	3.843s (+2.3%)	0.803s	24	1.79x

workflow with 50 sequential data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	3.431s (-16.4% 🟢)	4.108s (-10.8% 🟢)	0.678s	30	1.00x
🐘 Postgres	Express	3.498s (-12.3% 🟢)	4.012s (-8.2% 🟢)	0.514s	30	1.02x
🐘 Postgres	Next.js (Turbopack)	3.864s	4.045s	0.181s	30	1.13x
💻 Local	Next.js (Turbopack)	8.870s	9.161s	0.291s	14	2.59x
💻 Local	Nitro	9.175s (-1.3%)	9.787s (-2.3%)	0.613s	13	2.67x
💻 Local	Express	9.295s (+0.9%)	9.941s (-0.8%)	0.646s	13	2.71x

workflow with 10 concurrent data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	0.244s (-13.9% 🟢)	1.007s (~)	0.764s	60	1.00x
🐘 Postgres	Next.js (Turbopack)	0.248s	1.007s	0.759s	60	1.02x
🐘 Postgres	Express	0.261s (-7.6% 🟢)	1.008s (~)	0.747s	60	1.07x
💻 Local	Express	0.595s (+6.1% 🔺)	1.005s (~)	0.410s	60	2.44x
💻 Local	Nitro	0.599s (-1.0%)	1.005s (-1.6%)	0.406s	60	2.46x
💻 Local	Next.js (Turbopack)	0.607s	1.022s	0.415s	59	2.49x

workflow with 25 concurrent data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	0.409s (-19.7% 🟢)	1.007s (~)	0.598s	90	1.00x
🐘 Postgres	Nitro	0.426s (-14.1% 🟢)	1.009s (~)	0.583s	90	1.04x
🐘 Postgres	Next.js (Turbopack)	0.504s	1.007s	0.503s	90	1.23x
💻 Local	Nitro	2.548s (~)	3.009s (~)	0.461s	30	6.23x
💻 Local	Next.js (Turbopack)	2.681s	3.009s	0.328s	30	6.55x
💻 Local	Express	2.844s (+13.1% 🔺)	3.472s (+15.4% 🔺)	0.629s	26	6.95x

workflow with 50 concurrent data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	0.654s (-20.1% 🟢)	1.016s (~)	0.362s	119	1.00x
🐘 Postgres	Nitro	0.657s (-16.8% 🟢)	1.054s (+4.7%)	0.397s	114	1.01x
🐘 Postgres	Next.js (Turbopack)	0.820s	1.016s	0.196s	119	1.25x
💻 Local	Nitro	11.257s (+0.6%)	11.938s (+2.3%)	0.681s	11	17.21x
💻 Local	Next.js (Turbopack)	11.270s	11.847s	0.577s	11	17.23x
💻 Local	Express	12.606s (+12.7% 🔺)	13.033s (+9.1% 🔺)	0.426s	10	19.28x

Stream Benchmarks(includes TTFB metrics)

workflow with stream

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Next.js (Turbopack)	0.180s	1.002s	0.013s	1.019s	0.839s	10	1.00x
🐘 Postgres	Next.js (Turbopack)	0.198s	1.000s	0.001s	1.010s	0.812s	10	1.10x
💻 Local	Express	0.201s (+0.8%)	1.005s (~)	0.012s (-0.8%)	1.018s (~)	0.818s	10	1.12x
💻 Local	Nitro	0.209s (-2.2%)	1.004s (~)	0.013s (+3.2%)	1.019s (~)	0.810s	10	1.16x
🐘 Postgres	Express	0.255s (+24.3% 🔺)	1.000s (~)	0.045s (+2712.5% 🔺)	1.056s (+4.4%)	0.801s	10	1.42x
🐘 Postgres	Nitro	0.330s (+60.9% 🔺)	1.008s (+0.8%)	0.124s (+8166.7% 🔺)	1.159s (+14.6% 🔺)	0.829s	10	1.84x

stream pipeline with 5 transform steps (1MB)

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	0.585s (-6.3% 🟢)	1.040s (+3.3%)	0.032s (+667.7% 🔺)	1.083s (+5.9% 🔺)	0.499s	56	1.00x
🐘 Postgres	Express	0.600s (-4.7%)	1.008s (~)	0.005s (+32.7% 🔺)	1.025s (~)	0.425s	59	1.03x
🐘 Postgres	Next.js (Turbopack)	0.650s	1.026s	0.007s	1.042s	0.392s	58	1.11x
💻 Local	Next.js (Turbopack)	0.680s	1.011s	0.009s	1.023s	0.343s	59	1.16x
💻 Local	Express	0.825s (+8.9% 🔺)	1.013s (-1.5%)	0.015s (+59.3% 🔺)	1.030s (-0.9%)	0.206s	59	1.41x
💻 Local	Nitro	0.847s (+0.9%)	1.012s (~)	0.010s (+4.2%)	1.116s (~)	0.269s	54	1.45x

10 parallel streams (1MB each)

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Next.js (Turbopack)	0.965s	1.250s	0.000s	1.264s	0.299s	48	1.00x
🐘 Postgres	Express	1.015s (+5.6% 🔺)	1.463s (+14.5% 🔺)	0.000s (-43.9% 🟢)	1.478s (+13.1% 🔺)	0.463s	41	1.05x
🐘 Postgres	Nitro	1.144s (+18.1% 🔺)	1.461s (+17.1% 🔺)	0.000s (-41.5% 🟢)	1.481s (+17.7% 🔺)	0.336s	41	1.19x
💻 Local	Nitro	1.252s (+2.4%)	2.022s (~)	0.000s (+266.7% 🔺)	2.024s (~)	0.772s	30	1.30x
💻 Local	Next.js (Turbopack)	1.309s	2.020s	0.000s	2.023s	0.714s	30	1.36x
💻 Local	Express	1.374s (+12.2% 🔺)	2.022s (~)	0.001s (+60.0% 🔺)	2.025s (~)	0.651s	30	1.42x

fan-out fan-in 10 streams (1MB each)

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	1.888s (+6.5% 🔺)	2.312s (+6.2% 🔺)	0.000s (NaN%)	2.331s (+6.0% 🔺)	0.443s	26	1.00x
🐘 Postgres	Next.js (Turbopack)	1.890s	2.146s	0.000s	2.153s	0.264s	28	1.00x
🐘 Postgres	Nitro	1.917s (+7.0% 🔺)	2.465s (+15.1% 🔺)	0.000s (-100.0% 🟢)	2.532s (+16.4% 🔺)	0.615s	25	1.02x
💻 Local	Next.js (Turbopack)	3.662s	4.032s	0.001s	4.038s	0.376s	15	1.94x
💻 Local	Nitro	3.709s (+9.5% 🔺)	4.234s (+5.0% 🔺)	0.000s (-25.0% 🟢)	4.236s (+5.0%)	0.528s	15	1.96x
💻 Local	Express	4.304s (+24.1% 🔺)	4.423s (+9.7% 🔺)	0.000s (-42.3% 🟢)	4.812s (+19.2% 🔺)	0.507s	13	2.28x

Summary

Fastest Framework by World

Winner determined by most benchmark wins

World	🥇 Fastest Framework	Wins
💻 Local	Next.js (Turbopack)	16/21
🐘 Postgres	Nitro	11/21

Fastest World by Framework

Winner determined by most benchmark wins

Framework	🥇 Fastest World	Wins
Express	🐘 Postgres	18/21
Next.js (Turbopack)	🐘 Postgres	17/21
Nitro	🐘 Postgres	19/21

Column Definitions

• Workflow Time: Runtime reported by workflow (completedAt - createdAt) - primary metric
• TTFB: Time to First Byte - time from workflow start until first stream byte received (stream benchmarks only)
• Slurp: Time from first byte to complete stream consumption (stream benchmarks only)
• Wall Time: Total testbench time (trigger workflow + poll for result)
• Overhead: Testbench overhead (Wall Time - Workflow Time)
• Samples: Number of benchmark iterations run
• vs Fastest: How much slower compared to the fastest configuration for this benchmark

Worlds:

• 💻 Local: In-memory filesystem world (local development)
• 🐘 Postgres: PostgreSQL database world (local development)
• ▲ Vercel: Vercel production/preview deployment
• 🌐 Turso: Community world (local development)
• 🌐 MongoDB: Community world (local development)
• 🌐 Redis: Community world (local development)
• 🌐 Jazz: Community world (local development)

---

📋 View full workflow run

[Copilot]

Pull request overview

Adjusts the e2e “step error preserves stack trace” assertions for Vite local dev after the Vite upgrade started preserving step bundle source maps in dev mode.

Changes:

• Update hasStepSourceMaps() to allow Vite local dev to assert original source filenames in stacks (while keeping local prod behavior unchanged).
• Add an (empty) changeset note documenting the Vite local-dev e2e fix.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
packages/core/e2e/utils.ts	Refines step sourcemap support matrix so Vite local dev no longer disables stack source assertions.
.changeset/fix-vite-step-source-maps-e2e.md	Documents the reason for the Vite local-dev e2e assertion change.

---

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[TooTallNate]

Summary

• Vite local-dev e2e tests basic step error preserves message and stack trace and cross-file step error preserves message and function names in stack have been failing consistently since #1827 bumped workbench/vite from vite@^7.1.12 to vite@^7.3.2.
• The newer vite preserves step bundle source maps in dev mode, so stack traces now point at original files (99_e2e.ts, helpers.ts). However, hasStepSourceMaps() in packages/core/e2e/utils.ts still hard-codes vite as having no step source maps in any local environment, so the assertion expect(stack).not.toContain('99_e2e.ts') fails.
• Fix: drop the vite-specific block in hasStepSourceMaps() entirely. Vite local dev now falls through to the default return true, while vite local prod is still caught by the existing !DEV_TEST_CONFIG guard further down — so local-prod behavior is unchanged.

Why this took 6 days to surface

1. The push for [workflow] Bump Vite #1827 had Local Dev tests skipped due to matrix selection at the time.
2. The next push (Lock next@canary test version #1860) introduced a CI env-var bug that prevented Local Dev tests from running at all.
3. ci: fix VERCEL_WORKFLOW_SERVER_* env var ternary on main #1859 (28dc089e) fixed the env-var bug, finally letting vite local dev run — and it surfaced this assertion failure.

Reference failing run: https://github.com/vercel/workflow/actions/runs/25067758534/job/73444472541

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
example-nextjs-workflow-turbopack	Ready	Preview, Comment	Apr 28, 2026 7:01pm
example-nextjs-workflow-webpack	Ready	Preview, Comment	Apr 28, 2026 7:01pm
example-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-astro-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-express-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-fastify-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-hono-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-nitro-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-nuxt-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-sveltekit-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-vite-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workflow-docs	Ready	Preview, Comment, Open in v0	Apr 28, 2026 7:01pm
workflow-swc-playground	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workflow-web	Ready	Preview, Comment	Apr 28, 2026 7:01pm

[changeset-bot]

🦋 Changeset detected

Latest commit: 072a4d0

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

This PR includes changesets to release 0 packages

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions]

🧪 E2E Test Results

✅ All tests passed

Summary

	Passed	Failed	Skipped	Total
✅ ▲ Vercel Production	978	0	67	1045
✅ 💻 Local Development	1054	0	86	1140
✅ 📦 Local Production	1054	0	86	1140
✅ 🐘 Local Postgres	1054	0	86	1140
✅ 🪟 Windows	95	0	0	95
✅ 📋 Other	267	0	18	285
Total	4502	0	343	4845

Details by Category

✅ ▲ Vercel Production

App	Passed	Failed	Skipped
✅ astro	88	0	7
✅ example	88	0	7
✅ express	88	0	7
✅ fastify	88	0	7
✅ hono	88	0	7
✅ nextjs-turbopack	93	0	2
✅ nextjs-webpack	93	0	2
✅ nitro	88	0	7
✅ nuxt	88	0	7
✅ sveltekit	88	0	7
✅ vite	88	0	7

✅ 💻 Local Development

App	Passed	Failed	Skipped
✅ astro-stable	89	0	6
✅ express-stable	89	0	6
✅ fastify-stable	89	0	6
✅ hono-stable	89	0	6
✅ nextjs-turbopack-canary	76	0	19
✅ nextjs-turbopack-stable	95	0	0
✅ nextjs-webpack-canary	76	0	19
✅ nextjs-webpack-stable	95	0	0
✅ nitro-stable	89	0	6
✅ nuxt-stable	89	0	6
✅ sveltekit-stable	89	0	6
✅ vite-stable	89	0	6

✅ 📦 Local Production

App	Passed	Failed	Skipped
✅ astro-stable	89	0	6
✅ express-stable	89	0	6
✅ fastify-stable	89	0	6
✅ hono-stable	89	0	6
✅ nextjs-turbopack-canary	76	0	19
✅ nextjs-turbopack-stable	95	0	0
✅ nextjs-webpack-canary	76	0	19
✅ nextjs-webpack-stable	95	0	0
✅ nitro-stable	89	0	6
✅ nuxt-stable	89	0	6
✅ sveltekit-stable	89	0	6
✅ vite-stable	89	0	6

✅ 🐘 Local Postgres

App	Passed	Failed	Skipped
✅ astro-stable	89	0	6
✅ express-stable	89	0	6
✅ fastify-stable	89	0	6
✅ hono-stable	89	0	6
✅ nextjs-turbopack-canary	76	0	19
✅ nextjs-turbopack-stable	95	0	0
✅ nextjs-webpack-canary	76	0	19
✅ nextjs-webpack-stable	95	0	0
✅ nitro-stable	89	0	6
✅ nuxt-stable	89	0	6
✅ sveltekit-stable	89	0	6
✅ vite-stable	89	0	6

✅ 🪟 Windows

App	Passed	Failed	Skipped
✅ nextjs-turbopack	95	0	0

✅ 📋 Other

App	Passed	Failed	Skipped
✅ e2e-local-dev-nest-stable	89	0	6
✅ e2e-local-postgres-nest-stable	89	0	6
✅ e2e-local-prod-nest-stable	89	0	6

---

📋 View full workflow run

[github-actions]

📊 Benchmark Results

📈 Comparing against baseline from main branch. Green 🟢 = faster, Red 🔺 = slower.

workflow with no steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Express	0.040s (-9.3% 🟢)	1.005s (~)	0.965s	10	1.00x
💻 Local	Nitro	0.046s (+6.7% 🔺)	1.005s (~)	0.959s	10	1.14x
🐘 Postgres	Nitro	0.049s (-48.3% 🟢)	1.011s (-3.1%)	0.961s	10	1.22x
💻 Local	Next.js (Turbopack)	0.051s	1.005s	0.954s	10	1.27x
🐘 Postgres	Express	0.053s (-8.4% 🟢)	1.012s (~)	0.959s	10	1.32x
🐘 Postgres	Next.js (Turbopack)	0.057s	1.009s	0.952s	10	1.42x

workflow with 1 step

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Next.js (Turbopack)	1.120s	2.005s	0.886s	10	1.00x
💻 Local	Express	1.127s (~)	2.005s (~)	0.878s	10	1.01x
🐘 Postgres	Nitro	1.128s (-1.1%)	2.008s (~)	0.880s	10	1.01x
💻 Local	Nitro	1.137s (+0.5%)	2.006s (~)	0.869s	10	1.02x
🐘 Postgres	Express	1.144s (~)	2.010s (~)	0.867s	10	1.02x
🐘 Postgres	Next.js (Turbopack)	1.150s	2.012s	0.862s	10	1.03x

workflow with 10 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	10.770s (-0.9%)	11.023s (~)	0.253s	3	1.00x
🐘 Postgres	Express	10.787s (-1.6%)	11.025s (~)	0.238s	3	1.00x
💻 Local	Next.js (Turbopack)	10.789s	11.024s	0.235s	3	1.00x
🐘 Postgres	Next.js (Turbopack)	10.879s	11.025s	0.146s	3	1.01x
💻 Local	Express	10.922s (~)	11.023s (~)	0.100s	3	1.01x
💻 Local	Nitro	10.955s (~)	11.024s (~)	0.069s	3	1.02x

workflow with 25 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	14.344s (-1.6%)	15.034s (~)	0.691s	4	1.00x
🐘 Postgres	Next.js (Turbopack)	14.467s	15.023s	0.556s	4	1.01x
💻 Local	Next.js (Turbopack)	14.720s	15.030s	0.310s	4	1.03x
🐘 Postgres	Nitro	14.789s (+1.3%)	15.529s (+3.3%)	0.740s	4	1.03x
💻 Local	Express	14.980s (~)	15.029s (~)	0.049s	4	1.04x
💻 Local	Nitro	15.104s (~)	16.033s (~)	0.929s	4	1.05x

workflow with 50 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	13.522s (-3.5%)	14.029s (-3.9%)	0.507s	7	1.00x
🐘 Postgres	Next.js (Turbopack)	13.921s	14.022s	0.101s	7	1.03x
🐘 Postgres	Nitro	14.610s (+4.6%)	15.355s (+7.3% 🔺)	0.745s	6	1.08x
💻 Local	Next.js (Turbopack)	16.229s	17.032s	0.803s	6	1.20x
💻 Local	Express	16.828s (+1.4%)	17.198s (+1.0%)	0.370s	6	1.24x
💻 Local	Nitro	16.921s (+0.8%)	17.032s (~)	0.111s	6	1.25x

Promise.all with 10 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	1.203s (-5.6% 🟢)	2.010s (~)	0.807s	15	1.00x
🐘 Postgres	Next.js (Turbopack)	1.233s	2.010s	0.777s	15	1.03x
🐘 Postgres	Express	1.234s (-2.1%)	2.011s (~)	0.777s	15	1.03x
💻 Local	Next.js (Turbopack)	1.509s	2.006s	0.497s	15	1.25x
💻 Local	Express	1.526s (+2.5%)	2.006s (~)	0.480s	15	1.27x
💻 Local	Nitro	1.561s (-4.3%)	2.006s (-3.3%)	0.445s	15	1.30x

Promise.all with 25 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	2.304s (-2.0%)	3.026s (+0.6%)	0.722s	10	1.00x
🐘 Postgres	Express	2.376s (+0.6%)	3.011s (~)	0.635s	10	1.03x
🐘 Postgres	Next.js (Turbopack)	2.406s	3.009s	0.603s	10	1.04x
💻 Local	Next.js (Turbopack)	2.809s	3.454s	0.645s	9	1.22x
💻 Local	Nitro	3.045s (-3.1%)	3.453s (-11.1% 🟢)	0.407s	9	1.32x
💻 Local	Express	3.066s (+3.8%)	3.885s (+12.5% 🔺)	0.819s	8	1.33x

Promise.all with 50 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	3.494s (~)	4.014s (~)	0.520s	8	1.00x
🐘 Postgres	Nitro	3.496s (~)	4.026s (~)	0.530s	8	1.00x
🐘 Postgres	Next.js (Turbopack)	3.682s	4.011s	0.329s	8	1.05x
💻 Local	Next.js (Turbopack)	7.885s	8.519s	0.634s	4	2.26x
💻 Local	Express	8.294s (-0.5%)	9.022s (~)	0.728s	4	2.37x
💻 Local	Nitro	9.038s (+8.2% 🔺)	9.522s (+5.6% 🔺)	0.485s	4	2.59x

Promise.race with 10 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	1.206s (-4.0%)	2.007s (~)	0.801s	15	1.00x
🐘 Postgres	Next.js (Turbopack)	1.239s	2.010s	0.771s	15	1.03x
🐘 Postgres	Express	1.247s (-0.8%)	2.010s (~)	0.763s	15	1.03x
💻 Local	Next.js (Turbopack)	1.520s	2.006s	0.486s	15	1.26x
💻 Local	Nitro	1.566s (-16.1% 🟢)	2.006s (-14.3% 🟢)	0.440s	15	1.30x
💻 Local	Express	1.678s (-11.4% 🟢)	2.222s (-6.0% 🟢)	0.544s	14	1.39x

Promise.race with 25 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	2.270s (-3.0%)	3.007s (~)	0.737s	10	1.00x
🐘 Postgres	Express	2.342s (~)	3.009s (~)	0.667s	10	1.03x
🐘 Postgres	Next.js (Turbopack)	2.402s	3.010s	0.608s	10	1.06x
💻 Local	Next.js (Turbopack)	2.983s	3.760s	0.776s	8	1.31x
💻 Local	Nitro	3.004s (-2.0%)	3.760s (-3.3%)	0.756s	8	1.32x
💻 Local	Express	3.144s (~)	4.010s (+6.6% 🔺)	0.866s	8	1.39x

Promise.race with 50 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	3.416s (-1.9%)	4.008s (~)	0.593s	8	1.00x
🐘 Postgres	Express	3.448s (-1.5%)	4.011s (~)	0.563s	8	1.01x
🐘 Postgres	Next.js (Turbopack)	3.649s	4.014s	0.365s	8	1.07x
💻 Local	Next.js (Turbopack)	8.305s	9.021s	0.716s	4	2.43x
💻 Local	Express	8.866s (+0.7%)	9.273s (~)	0.406s	4	2.60x
💻 Local	Nitro	9.213s (+0.8%)	9.772s (-2.5%)	0.559s	4	2.70x

workflow with 10 sequential data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	0.714s (-15.0% 🟢)	1.007s (-1.6%)	0.293s	60	1.00x
🐘 Postgres	Next.js (Turbopack)	0.781s	1.006s	0.226s	60	1.09x
💻 Local	Next.js (Turbopack)	0.890s	1.039s	0.149s	58	1.25x
🐘 Postgres	Nitro	0.982s (+19.7% 🔺)	1.346s (+33.7% 🔺)	0.363s	45	1.38x
💻 Local	Nitro	1.014s (+3.4%)	1.720s (+57.2% 🔺)	0.706s	35	1.42x
💻 Local	Express	1.128s (+14.6% 🔺)	1.570s (+45.9% 🔺)	0.442s	39	1.58x

workflow with 25 sequential data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	1.698s (-14.1% 🟢)	2.009s (-11.0% 🟢)	0.311s	45	1.00x
🐘 Postgres	Nitro	1.728s (-10.3% 🟢)	2.100s (~)	0.372s	43	1.02x
🐘 Postgres	Next.js (Turbopack)	1.932s	2.173s	0.241s	42	1.14x
💻 Local	Next.js (Turbopack)	2.943s	3.223s	0.280s	28	1.73x
💻 Local	Express	3.035s (+0.6%)	3.586s (~)	0.550s	26	1.79x
💻 Local	Nitro	3.041s (~)	3.843s (+2.3%)	0.803s	24	1.79x

workflow with 50 sequential data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	3.431s (-16.4% 🟢)	4.108s (-10.8% 🟢)	0.678s	30	1.00x
🐘 Postgres	Express	3.498s (-12.3% 🟢)	4.012s (-8.2% 🟢)	0.514s	30	1.02x
🐘 Postgres	Next.js (Turbopack)	3.864s	4.045s	0.181s	30	1.13x
💻 Local	Next.js (Turbopack)	8.870s	9.161s	0.291s	14	2.59x
💻 Local	Nitro	9.175s (-1.3%)	9.787s (-2.3%)	0.613s	13	2.67x
💻 Local	Express	9.295s (+0.9%)	9.941s (-0.8%)	0.646s	13	2.71x

workflow with 10 concurrent data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	0.244s (-13.9% 🟢)	1.007s (~)	0.764s	60	1.00x
🐘 Postgres	Next.js (Turbopack)	0.248s	1.007s	0.759s	60	1.02x
🐘 Postgres	Express	0.261s (-7.6% 🟢)	1.008s (~)	0.747s	60	1.07x
💻 Local	Express	0.595s (+6.1% 🔺)	1.005s (~)	0.410s	60	2.44x
💻 Local	Nitro	0.599s (-1.0%)	1.005s (-1.6%)	0.406s	60	2.46x
💻 Local	Next.js (Turbopack)	0.607s	1.022s	0.415s	59	2.49x

workflow with 25 concurrent data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	0.409s (-19.7% 🟢)	1.007s (~)	0.598s	90	1.00x
🐘 Postgres	Nitro	0.426s (-14.1% 🟢)	1.009s (~)	0.583s	90	1.04x
🐘 Postgres	Next.js (Turbopack)	0.504s	1.007s	0.503s	90	1.23x
💻 Local	Nitro	2.548s (~)	3.009s (~)	0.461s	30	6.23x
💻 Local	Next.js (Turbopack)	2.681s	3.009s	0.328s	30	6.55x
💻 Local	Express	2.844s (+13.1% 🔺)	3.472s (+15.4% 🔺)	0.629s	26	6.95x

workflow with 50 concurrent data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	0.654s (-20.1% 🟢)	1.016s (~)	0.362s	119	1.00x
🐘 Postgres	Nitro	0.657s (-16.8% 🟢)	1.054s (+4.7%)	0.397s	114	1.01x
🐘 Postgres	Next.js (Turbopack)	0.820s	1.016s	0.196s	119	1.25x
💻 Local	Nitro	11.257s (+0.6%)	11.938s (+2.3%)	0.681s	11	17.21x
💻 Local	Next.js (Turbopack)	11.270s	11.847s	0.577s	11	17.23x
💻 Local	Express	12.606s (+12.7% 🔺)	13.033s (+9.1% 🔺)	0.426s	10	19.28x

Stream Benchmarks(includes TTFB metrics)

workflow with stream

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Next.js (Turbopack)	0.180s	1.002s	0.013s	1.019s	0.839s	10	1.00x
🐘 Postgres	Next.js (Turbopack)	0.198s	1.000s	0.001s	1.010s	0.812s	10	1.10x
💻 Local	Express	0.201s (+0.8%)	1.005s (~)	0.012s (-0.8%)	1.018s (~)	0.818s	10	1.12x
💻 Local	Nitro	0.209s (-2.2%)	1.004s (~)	0.013s (+3.2%)	1.019s (~)	0.810s	10	1.16x
🐘 Postgres	Express	0.255s (+24.3% 🔺)	1.000s (~)	0.045s (+2712.5% 🔺)	1.056s (+4.4%)	0.801s	10	1.42x
🐘 Postgres	Nitro	0.330s (+60.9% 🔺)	1.008s (+0.8%)	0.124s (+8166.7% 🔺)	1.159s (+14.6% 🔺)	0.829s	10	1.84x

stream pipeline with 5 transform steps (1MB)

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	0.585s (-6.3% 🟢)	1.040s (+3.3%)	0.032s (+667.7% 🔺)	1.083s (+5.9% 🔺)	0.499s	56	1.00x
🐘 Postgres	Express	0.600s (-4.7%)	1.008s (~)	0.005s (+32.7% 🔺)	1.025s (~)	0.425s	59	1.03x
🐘 Postgres	Next.js (Turbopack)	0.650s	1.026s	0.007s	1.042s	0.392s	58	1.11x
💻 Local	Next.js (Turbopack)	0.680s	1.011s	0.009s	1.023s	0.343s	59	1.16x
💻 Local	Express	0.825s (+8.9% 🔺)	1.013s (-1.5%)	0.015s (+59.3% 🔺)	1.030s (-0.9%)	0.206s	59	1.41x
💻 Local	Nitro	0.847s (+0.9%)	1.012s (~)	0.010s (+4.2%)	1.116s (~)	0.269s	54	1.45x

10 parallel streams (1MB each)

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Next.js (Turbopack)	0.965s	1.250s	0.000s	1.264s	0.299s	48	1.00x
🐘 Postgres	Express	1.015s (+5.6% 🔺)	1.463s (+14.5% 🔺)	0.000s (-43.9% 🟢)	1.478s (+13.1% 🔺)	0.463s	41	1.05x
🐘 Postgres	Nitro	1.144s (+18.1% 🔺)	1.461s (+17.1% 🔺)	0.000s (-41.5% 🟢)	1.481s (+17.7% 🔺)	0.336s	41	1.19x
💻 Local	Nitro	1.252s (+2.4%)	2.022s (~)	0.000s (+266.7% 🔺)	2.024s (~)	0.772s	30	1.30x
💻 Local	Next.js (Turbopack)	1.309s	2.020s	0.000s	2.023s	0.714s	30	1.36x
💻 Local	Express	1.374s (+12.2% 🔺)	2.022s (~)	0.001s (+60.0% 🔺)	2.025s (~)	0.651s	30	1.42x

fan-out fan-in 10 streams (1MB each)

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	1.888s (+6.5% 🔺)	2.312s (+6.2% 🔺)	0.000s (NaN%)	2.331s (+6.0% 🔺)	0.443s	26	1.00x
🐘 Postgres	Next.js (Turbopack)	1.890s	2.146s	0.000s	2.153s	0.264s	28	1.00x
🐘 Postgres	Nitro	1.917s (+7.0% 🔺)	2.465s (+15.1% 🔺)	0.000s (-100.0% 🟢)	2.532s (+16.4% 🔺)	0.615s	25	1.02x
💻 Local	Next.js (Turbopack)	3.662s	4.032s	0.001s	4.038s	0.376s	15	1.94x
💻 Local	Nitro	3.709s (+9.5% 🔺)	4.234s (+5.0% 🔺)	0.000s (-25.0% 🟢)	4.236s (+5.0%)	0.528s	15	1.96x
💻 Local	Express	4.304s (+24.1% 🔺)	4.423s (+9.7% 🔺)	0.000s (-42.3% 🟢)	4.812s (+19.2% 🔺)	0.507s	13	2.28x

Summary

Fastest Framework by World

Winner determined by most benchmark wins

World	🥇 Fastest Framework	Wins
💻 Local	Next.js (Turbopack)	16/21
🐘 Postgres	Nitro	11/21

Fastest World by Framework

Winner determined by most benchmark wins

Framework	🥇 Fastest World	Wins
Express	🐘 Postgres	18/21
Next.js (Turbopack)	🐘 Postgres	17/21
Nitro	🐘 Postgres	19/21

Column Definitions

• Workflow Time: Runtime reported by workflow (completedAt - createdAt) - primary metric
• TTFB: Time to First Byte - time from workflow start until first stream byte received (stream benchmarks only)
• Slurp: Time from first byte to complete stream consumption (stream benchmarks only)
• Wall Time: Total testbench time (trigger workflow + poll for result)
• Overhead: Testbench overhead (Wall Time - Workflow Time)
• Samples: Number of benchmark iterations run
• vs Fastest: How much slower compared to the fastest configuration for this benchmark

Worlds:

• 💻 Local: In-memory filesystem world (local development)
• 🐘 Postgres: PostgreSQL database world (local development)
• ▲ Vercel: Vercel production/preview deployment
• 🌐 Turso: Community world (local development)
• 🌐 MongoDB: Community world (local development)
• 🌐 Redis: Community world (local development)
• 🌐 Jazz: Community world (local development)

---

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[Copilot]

Pull request overview

Adjusts the e2e “step error preserves stack trace” assertions for Vite local dev after the Vite upgrade started preserving step bundle source maps in dev mode.

Changes:

• Update hasStepSourceMaps() to allow Vite local dev to assert original source filenames in stacks (while keeping local prod behavior unchanged).
• Add an (empty) changeset note documenting the Vite local-dev e2e fix.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
packages/core/e2e/utils.ts	Refines step sourcemap support matrix so Vite local dev no longer disables stack source assertions.
.changeset/fix-vite-step-source-maps-e2e.md	Documents the reason for the Vite local-dev e2e assertion change.

---

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[TooTallNate]

Summary

• Vite local-dev e2e tests basic step error preserves message and stack trace and cross-file step error preserves message and function names in stack have been failing consistently since #1827 bumped workbench/vite from vite@^7.1.12 to vite@^7.3.2.
• The newer vite preserves step bundle source maps in dev mode, so stack traces now point at original files (99_e2e.ts, helpers.ts). However, hasStepSourceMaps() in packages/core/e2e/utils.ts still hard-codes vite as having no step source maps in any local environment, so the assertion expect(stack).not.toContain('99_e2e.ts') fails.
• Fix: drop the vite-specific block in hasStepSourceMaps() entirely. Vite local dev now falls through to the default return true, while vite local prod is still caught by the existing !DEV_TEST_CONFIG guard further down — so local-prod behavior is unchanged.

Why this took 6 days to surface

1. The push for [workflow] Bump Vite #1827 had Local Dev tests skipped due to matrix selection at the time.
2. The next push (Lock next@canary test version #1860) introduced a CI env-var bug that prevented Local Dev tests from running at all.
3. ci: fix VERCEL_WORKFLOW_SERVER_* env var ternary on main #1859 (28dc089e) fixed the env-var bug, finally letting vite local dev run — and it surfaced this assertion failure.

Reference failing run: https://github.com/vercel/workflow/actions/runs/25067758534/job/73444472541

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
example-nextjs-workflow-turbopack	Ready	Preview, Comment	Apr 28, 2026 7:01pm
example-nextjs-workflow-webpack	Ready	Preview, Comment	Apr 28, 2026 7:01pm
example-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-astro-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-express-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-fastify-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-hono-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-nitro-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-nuxt-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-sveltekit-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-vite-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workflow-docs	Ready	Preview, Comment, Open in v0	Apr 28, 2026 7:01pm
workflow-swc-playground	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workflow-web	Ready	Preview, Comment	Apr 28, 2026 7:01pm

[changeset-bot]

🦋 Changeset detected

Latest commit: 072a4d0

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

This PR includes changesets to release 0 packages

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions]

🧪 E2E Test Results

✅ All tests passed

Summary

	Passed	Failed	Skipped	Total
✅ ▲ Vercel Production	978	0	67	1045
✅ 💻 Local Development	1054	0	86	1140
✅ 📦 Local Production	1054	0	86	1140
✅ 🐘 Local Postgres	1054	0	86	1140
✅ 🪟 Windows	95	0	0	95
✅ 📋 Other	267	0	18	285
Total	4502	0	343	4845

Details by Category

✅ ▲ Vercel Production

App	Passed	Failed	Skipped
✅ astro	88	0	7
✅ example	88	0	7
✅ express	88	0	7
✅ fastify	88	0	7
✅ hono	88	0	7
✅ nextjs-turbopack	93	0	2
✅ nextjs-webpack	93	0	2
✅ nitro	88	0	7
✅ nuxt	88	0	7
✅ sveltekit	88	0	7
✅ vite	88	0	7

✅ 💻 Local Development

App	Passed	Failed	Skipped
✅ astro-stable	89	0	6
✅ express-stable	89	0	6
✅ fastify-stable	89	0	6
✅ hono-stable	89	0	6
✅ nextjs-turbopack-canary	76	0	19
✅ nextjs-turbopack-stable	95	0	0
✅ nextjs-webpack-canary	76	0	19
✅ nextjs-webpack-stable	95	0	0
✅ nitro-stable	89	0	6
✅ nuxt-stable	89	0	6
✅ sveltekit-stable	89	0	6
✅ vite-stable	89	0	6

✅ 📦 Local Production

App	Passed	Failed	Skipped
✅ astro-stable	89	0	6
✅ express-stable	89	0	6
✅ fastify-stable	89	0	6
✅ hono-stable	89	0	6
✅ nextjs-turbopack-canary	76	0	19
✅ nextjs-turbopack-stable	95	0	0
✅ nextjs-webpack-canary	76	0	19
✅ nextjs-webpack-stable	95	0	0
✅ nitro-stable	89	0	6
✅ nuxt-stable	89	0	6
✅ sveltekit-stable	89	0	6
✅ vite-stable	89	0	6

✅ 🐘 Local Postgres

App	Passed	Failed	Skipped
✅ astro-stable	89	0	6
✅ express-stable	89	0	6
✅ fastify-stable	89	0	6
✅ hono-stable	89	0	6
✅ nextjs-turbopack-canary	76	0	19
✅ nextjs-turbopack-stable	95	0	0
✅ nextjs-webpack-canary	76	0	19
✅ nextjs-webpack-stable	95	0	0
✅ nitro-stable	89	0	6
✅ nuxt-stable	89	0	6
✅ sveltekit-stable	89	0	6
✅ vite-stable	89	0	6

✅ 🪟 Windows

App	Passed	Failed	Skipped
✅ nextjs-turbopack	95	0	0

✅ 📋 Other

App	Passed	Failed	Skipped
✅ e2e-local-dev-nest-stable	89	0	6
✅ e2e-local-postgres-nest-stable	89	0	6
✅ e2e-local-prod-nest-stable	89	0	6

---

📋 View full workflow run

[github-actions]

📊 Benchmark Results

📈 Comparing against baseline from main branch. Green 🟢 = faster, Red 🔺 = slower.

workflow with no steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Express	0.040s (-9.3% 🟢)	1.005s (~)	0.965s	10	1.00x
💻 Local	Nitro	0.046s (+6.7% 🔺)	1.005s (~)	0.959s	10	1.14x
🐘 Postgres	Nitro	0.049s (-48.3% 🟢)	1.011s (-3.1%)	0.961s	10	1.22x
💻 Local	Next.js (Turbopack)	0.051s	1.005s	0.954s	10	1.27x
🐘 Postgres	Express	0.053s (-8.4% 🟢)	1.012s (~)	0.959s	10	1.32x
🐘 Postgres	Next.js (Turbopack)	0.057s	1.009s	0.952s	10	1.42x

workflow with 1 step

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Next.js (Turbopack)	1.120s	2.005s	0.886s	10	1.00x
💻 Local	Express	1.127s (~)	2.005s (~)	0.878s	10	1.01x
🐘 Postgres	Nitro	1.128s (-1.1%)	2.008s (~)	0.880s	10	1.01x
💻 Local	Nitro	1.137s (+0.5%)	2.006s (~)	0.869s	10	1.02x
🐘 Postgres	Express	1.144s (~)	2.010s (~)	0.867s	10	1.02x
🐘 Postgres	Next.js (Turbopack)	1.150s	2.012s	0.862s	10	1.03x

workflow with 10 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	10.770s (-0.9%)	11.023s (~)	0.253s	3	1.00x
🐘 Postgres	Express	10.787s (-1.6%)	11.025s (~)	0.238s	3	1.00x
💻 Local	Next.js (Turbopack)	10.789s	11.024s	0.235s	3	1.00x
🐘 Postgres	Next.js (Turbopack)	10.879s	11.025s	0.146s	3	1.01x
💻 Local	Express	10.922s (~)	11.023s (~)	0.100s	3	1.01x
💻 Local	Nitro	10.955s (~)	11.024s (~)	0.069s	3	1.02x

workflow with 25 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	14.344s (-1.6%)	15.034s (~)	0.691s	4	1.00x
🐘 Postgres	Next.js (Turbopack)	14.467s	15.023s	0.556s	4	1.01x
💻 Local	Next.js (Turbopack)	14.720s	15.030s	0.310s	4	1.03x
🐘 Postgres	Nitro	14.789s (+1.3%)	15.529s (+3.3%)	0.740s	4	1.03x
💻 Local	Express	14.980s (~)	15.029s (~)	0.049s	4	1.04x
💻 Local	Nitro	15.104s (~)	16.033s (~)	0.929s	4	1.05x

workflow with 50 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	13.522s (-3.5%)	14.029s (-3.9%)	0.507s	7	1.00x
🐘 Postgres	Next.js (Turbopack)	13.921s	14.022s	0.101s	7	1.03x
🐘 Postgres	Nitro	14.610s (+4.6%)	15.355s (+7.3% 🔺)	0.745s	6	1.08x
💻 Local	Next.js (Turbopack)	16.229s	17.032s	0.803s	6	1.20x
💻 Local	Express	16.828s (+1.4%)	17.198s (+1.0%)	0.370s	6	1.24x
💻 Local	Nitro	16.921s (+0.8%)	17.032s (~)	0.111s	6	1.25x

Promise.all with 10 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	1.203s (-5.6% 🟢)	2.010s (~)	0.807s	15	1.00x
🐘 Postgres	Next.js (Turbopack)	1.233s	2.010s	0.777s	15	1.03x
🐘 Postgres	Express	1.234s (-2.1%)	2.011s (~)	0.777s	15	1.03x
💻 Local	Next.js (Turbopack)	1.509s	2.006s	0.497s	15	1.25x
💻 Local	Express	1.526s (+2.5%)	2.006s (~)	0.480s	15	1.27x
💻 Local	Nitro	1.561s (-4.3%)	2.006s (-3.3%)	0.445s	15	1.30x

Promise.all with 25 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	2.304s (-2.0%)	3.026s (+0.6%)	0.722s	10	1.00x
🐘 Postgres	Express	2.376s (+0.6%)	3.011s (~)	0.635s	10	1.03x
🐘 Postgres	Next.js (Turbopack)	2.406s	3.009s	0.603s	10	1.04x
💻 Local	Next.js (Turbopack)	2.809s	3.454s	0.645s	9	1.22x
💻 Local	Nitro	3.045s (-3.1%)	3.453s (-11.1% 🟢)	0.407s	9	1.32x
💻 Local	Express	3.066s (+3.8%)	3.885s (+12.5% 🔺)	0.819s	8	1.33x

Promise.all with 50 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	3.494s (~)	4.014s (~)	0.520s	8	1.00x
🐘 Postgres	Nitro	3.496s (~)	4.026s (~)	0.530s	8	1.00x
🐘 Postgres	Next.js (Turbopack)	3.682s	4.011s	0.329s	8	1.05x
💻 Local	Next.js (Turbopack)	7.885s	8.519s	0.634s	4	2.26x
💻 Local	Express	8.294s (-0.5%)	9.022s (~)	0.728s	4	2.37x
💻 Local	Nitro	9.038s (+8.2% 🔺)	9.522s (+5.6% 🔺)	0.485s	4	2.59x

Promise.race with 10 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	1.206s (-4.0%)	2.007s (~)	0.801s	15	1.00x
🐘 Postgres	Next.js (Turbopack)	1.239s	2.010s	0.771s	15	1.03x
🐘 Postgres	Express	1.247s (-0.8%)	2.010s (~)	0.763s	15	1.03x
💻 Local	Next.js (Turbopack)	1.520s	2.006s	0.486s	15	1.26x
💻 Local	Nitro	1.566s (-16.1% 🟢)	2.006s (-14.3% 🟢)	0.440s	15	1.30x
💻 Local	Express	1.678s (-11.4% 🟢)	2.222s (-6.0% 🟢)	0.544s	14	1.39x

Promise.race with 25 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	2.270s (-3.0%)	3.007s (~)	0.737s	10	1.00x
🐘 Postgres	Express	2.342s (~)	3.009s (~)	0.667s	10	1.03x
🐘 Postgres	Next.js (Turbopack)	2.402s	3.010s	0.608s	10	1.06x
💻 Local	Next.js (Turbopack)	2.983s	3.760s	0.776s	8	1.31x
💻 Local	Nitro	3.004s (-2.0%)	3.760s (-3.3%)	0.756s	8	1.32x
💻 Local	Express	3.144s (~)	4.010s (+6.6% 🔺)	0.866s	8	1.39x

Promise.race with 50 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	3.416s (-1.9%)	4.008s (~)	0.593s	8	1.00x
🐘 Postgres	Express	3.448s (-1.5%)	4.011s (~)	0.563s	8	1.01x
🐘 Postgres	Next.js (Turbopack)	3.649s	4.014s	0.365s	8	1.07x
💻 Local	Next.js (Turbopack)	8.305s	9.021s	0.716s	4	2.43x
💻 Local	Express	8.866s (+0.7%)	9.273s (~)	0.406s	4	2.60x
💻 Local	Nitro	9.213s (+0.8%)	9.772s (-2.5%)	0.559s	4	2.70x

workflow with 10 sequential data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	0.714s (-15.0% 🟢)	1.007s (-1.6%)	0.293s	60	1.00x
🐘 Postgres	Next.js (Turbopack)	0.781s	1.006s	0.226s	60	1.09x
💻 Local	Next.js (Turbopack)	0.890s	1.039s	0.149s	58	1.25x
🐘 Postgres	Nitro	0.982s (+19.7% 🔺)	1.346s (+33.7% 🔺)	0.363s	45	1.38x
💻 Local	Nitro	1.014s (+3.4%)	1.720s (+57.2% 🔺)	0.706s	35	1.42x
💻 Local	Express	1.128s (+14.6% 🔺)	1.570s (+45.9% 🔺)	0.442s	39	1.58x

workflow with 25 sequential data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	1.698s (-14.1% 🟢)	2.009s (-11.0% 🟢)	0.311s	45	1.00x
🐘 Postgres	Nitro	1.728s (-10.3% 🟢)	2.100s (~)	0.372s	43	1.02x
🐘 Postgres	Next.js (Turbopack)	1.932s	2.173s	0.241s	42	1.14x
💻 Local	Next.js (Turbopack)	2.943s	3.223s	0.280s	28	1.73x
💻 Local	Express	3.035s (+0.6%)	3.586s (~)	0.550s	26	1.79x
💻 Local	Nitro	3.041s (~)	3.843s (+2.3%)	0.803s	24	1.79x

workflow with 50 sequential data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	3.431s (-16.4% 🟢)	4.108s (-10.8% 🟢)	0.678s	30	1.00x
🐘 Postgres	Express	3.498s (-12.3% 🟢)	4.012s (-8.2% 🟢)	0.514s	30	1.02x
🐘 Postgres	Next.js (Turbopack)	3.864s	4.045s	0.181s	30	1.13x
💻 Local	Next.js (Turbopack)	8.870s	9.161s	0.291s	14	2.59x
💻 Local	Nitro	9.175s (-1.3%)	9.787s (-2.3%)	0.613s	13	2.67x
💻 Local	Express	9.295s (+0.9%)	9.941s (-0.8%)	0.646s	13	2.71x

workflow with 10 concurrent data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	0.244s (-13.9% 🟢)	1.007s (~)	0.764s	60	1.00x
🐘 Postgres	Next.js (Turbopack)	0.248s	1.007s	0.759s	60	1.02x
🐘 Postgres	Express	0.261s (-7.6% 🟢)	1.008s (~)	0.747s	60	1.07x
💻 Local	Express	0.595s (+6.1% 🔺)	1.005s (~)	0.410s	60	2.44x
💻 Local	Nitro	0.599s (-1.0%)	1.005s (-1.6%)	0.406s	60	2.46x
💻 Local	Next.js (Turbopack)	0.607s	1.022s	0.415s	59	2.49x

workflow with 25 concurrent data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	0.409s (-19.7% 🟢)	1.007s (~)	0.598s	90	1.00x
🐘 Postgres	Nitro	0.426s (-14.1% 🟢)	1.009s (~)	0.583s	90	1.04x
🐘 Postgres	Next.js (Turbopack)	0.504s	1.007s	0.503s	90	1.23x
💻 Local	Nitro	2.548s (~)	3.009s (~)	0.461s	30	6.23x
💻 Local	Next.js (Turbopack)	2.681s	3.009s	0.328s	30	6.55x
💻 Local	Express	2.844s (+13.1% 🔺)	3.472s (+15.4% 🔺)	0.629s	26	6.95x

workflow with 50 concurrent data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	0.654s (-20.1% 🟢)	1.016s (~)	0.362s	119	1.00x
🐘 Postgres	Nitro	0.657s (-16.8% 🟢)	1.054s (+4.7%)	0.397s	114	1.01x
🐘 Postgres	Next.js (Turbopack)	0.820s	1.016s	0.196s	119	1.25x
💻 Local	Nitro	11.257s (+0.6%)	11.938s (+2.3%)	0.681s	11	17.21x
💻 Local	Next.js (Turbopack)	11.270s	11.847s	0.577s	11	17.23x
💻 Local	Express	12.606s (+12.7% 🔺)	13.033s (+9.1% 🔺)	0.426s	10	19.28x

Stream Benchmarks(includes TTFB metrics)

workflow with stream

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Next.js (Turbopack)	0.180s	1.002s	0.013s	1.019s	0.839s	10	1.00x
🐘 Postgres	Next.js (Turbopack)	0.198s	1.000s	0.001s	1.010s	0.812s	10	1.10x
💻 Local	Express	0.201s (+0.8%)	1.005s (~)	0.012s (-0.8%)	1.018s (~)	0.818s	10	1.12x
💻 Local	Nitro	0.209s (-2.2%)	1.004s (~)	0.013s (+3.2%)	1.019s (~)	0.810s	10	1.16x
🐘 Postgres	Express	0.255s (+24.3% 🔺)	1.000s (~)	0.045s (+2712.5% 🔺)	1.056s (+4.4%)	0.801s	10	1.42x
🐘 Postgres	Nitro	0.330s (+60.9% 🔺)	1.008s (+0.8%)	0.124s (+8166.7% 🔺)	1.159s (+14.6% 🔺)	0.829s	10	1.84x

stream pipeline with 5 transform steps (1MB)

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	0.585s (-6.3% 🟢)	1.040s (+3.3%)	0.032s (+667.7% 🔺)	1.083s (+5.9% 🔺)	0.499s	56	1.00x
🐘 Postgres	Express	0.600s (-4.7%)	1.008s (~)	0.005s (+32.7% 🔺)	1.025s (~)	0.425s	59	1.03x
🐘 Postgres	Next.js (Turbopack)	0.650s	1.026s	0.007s	1.042s	0.392s	58	1.11x
💻 Local	Next.js (Turbopack)	0.680s	1.011s	0.009s	1.023s	0.343s	59	1.16x
💻 Local	Express	0.825s (+8.9% 🔺)	1.013s (-1.5%)	0.015s (+59.3% 🔺)	1.030s (-0.9%)	0.206s	59	1.41x
💻 Local	Nitro	0.847s (+0.9%)	1.012s (~)	0.010s (+4.2%)	1.116s (~)	0.269s	54	1.45x

10 parallel streams (1MB each)

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Next.js (Turbopack)	0.965s	1.250s	0.000s	1.264s	0.299s	48	1.00x
🐘 Postgres	Express	1.015s (+5.6% 🔺)	1.463s (+14.5% 🔺)	0.000s (-43.9% 🟢)	1.478s (+13.1% 🔺)	0.463s	41	1.05x
🐘 Postgres	Nitro	1.144s (+18.1% 🔺)	1.461s (+17.1% 🔺)	0.000s (-41.5% 🟢)	1.481s (+17.7% 🔺)	0.336s	41	1.19x
💻 Local	Nitro	1.252s (+2.4%)	2.022s (~)	0.000s (+266.7% 🔺)	2.024s (~)	0.772s	30	1.30x
💻 Local	Next.js (Turbopack)	1.309s	2.020s	0.000s	2.023s	0.714s	30	1.36x
💻 Local	Express	1.374s (+12.2% 🔺)	2.022s (~)	0.001s (+60.0% 🔺)	2.025s (~)	0.651s	30	1.42x

fan-out fan-in 10 streams (1MB each)

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	1.888s (+6.5% 🔺)	2.312s (+6.2% 🔺)	0.000s (NaN%)	2.331s (+6.0% 🔺)	0.443s	26	1.00x
🐘 Postgres	Next.js (Turbopack)	1.890s	2.146s	0.000s	2.153s	0.264s	28	1.00x
🐘 Postgres	Nitro	1.917s (+7.0% 🔺)	2.465s (+15.1% 🔺)	0.000s (-100.0% 🟢)	2.532s (+16.4% 🔺)	0.615s	25	1.02x
💻 Local	Next.js (Turbopack)	3.662s	4.032s	0.001s	4.038s	0.376s	15	1.94x
💻 Local	Nitro	3.709s (+9.5% 🔺)	4.234s (+5.0% 🔺)	0.000s (-25.0% 🟢)	4.236s (+5.0%)	0.528s	15	1.96x
💻 Local	Express	4.304s (+24.1% 🔺)	4.423s (+9.7% 🔺)	0.000s (-42.3% 🟢)	4.812s (+19.2% 🔺)	0.507s	13	2.28x

Summary

Fastest Framework by World

Winner determined by most benchmark wins

World	🥇 Fastest Framework	Wins
💻 Local	Next.js (Turbopack)	16/21
🐘 Postgres	Nitro	11/21

Fastest World by Framework

Winner determined by most benchmark wins

Framework	🥇 Fastest World	Wins
Express	🐘 Postgres	18/21
Next.js (Turbopack)	🐘 Postgres	17/21
Nitro	🐘 Postgres	19/21

Column Definitions

• Workflow Time: Runtime reported by workflow (completedAt - createdAt) - primary metric
• TTFB: Time to First Byte - time from workflow start until first stream byte received (stream benchmarks only)
• Slurp: Time from first byte to complete stream consumption (stream benchmarks only)
• Wall Time: Total testbench time (trigger workflow + poll for result)
• Overhead: Testbench overhead (Wall Time - Workflow Time)
• Samples: Number of benchmark iterations run
• vs Fastest: How much slower compared to the fastest configuration for this benchmark

Worlds:

• 💻 Local: In-memory filesystem world (local development)
• 🐘 Postgres: PostgreSQL database world (local development)
• ▲ Vercel: Vercel production/preview deployment
• 🌐 Turso: Community world (local development)
• 🌐 MongoDB: Community world (local development)
• 🌐 Redis: Community world (local development)
• 🌐 Jazz: Community world (local development)

---

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[Copilot]

Pull request overview

Adjusts the e2e “step error preserves stack trace” assertions for Vite local dev after the Vite upgrade started preserving step bundle source maps in dev mode.

Changes:

• Update hasStepSourceMaps() to allow Vite local dev to assert original source filenames in stacks (while keeping local prod behavior unchanged).
• Add an (empty) changeset note documenting the Vite local-dev e2e fix.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
packages/core/e2e/utils.ts	Refines step sourcemap support matrix so Vite local dev no longer disables stack source assertions.
.changeset/fix-vite-step-source-maps-e2e.md	Documents the reason for the Vite local-dev e2e assertion change.

---

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[TooTallNate]

Summary

• Vite local-dev e2e tests basic step error preserves message and stack trace and cross-file step error preserves message and function names in stack have been failing consistently since #1827 bumped workbench/vite from vite@^7.1.12 to vite@^7.3.2.
• The newer vite preserves step bundle source maps in dev mode, so stack traces now point at original files (99_e2e.ts, helpers.ts). However, hasStepSourceMaps() in packages/core/e2e/utils.ts still hard-codes vite as having no step source maps in any local environment, so the assertion expect(stack).not.toContain('99_e2e.ts') fails.
• Fix: drop the vite-specific block in hasStepSourceMaps() entirely. Vite local dev now falls through to the default return true, while vite local prod is still caught by the existing !DEV_TEST_CONFIG guard further down — so local-prod behavior is unchanged.

Why this took 6 days to surface

1. The push for [workflow] Bump Vite #1827 had Local Dev tests skipped due to matrix selection at the time.
2. The next push (Lock next@canary test version #1860) introduced a CI env-var bug that prevented Local Dev tests from running at all.
3. ci: fix VERCEL_WORKFLOW_SERVER_* env var ternary on main #1859 (28dc089e) fixed the env-var bug, finally letting vite local dev run — and it surfaced this assertion failure.

Reference failing run: https://github.com/vercel/workflow/actions/runs/25067758534/job/73444472541

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
example-nextjs-workflow-turbopack	Ready	Preview, Comment	Apr 28, 2026 7:01pm
example-nextjs-workflow-webpack	Ready	Preview, Comment	Apr 28, 2026 7:01pm
example-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-astro-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-express-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-fastify-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-hono-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-nitro-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-nuxt-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-sveltekit-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-vite-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workflow-docs	Ready	Preview, Comment, Open in v0	Apr 28, 2026 7:01pm
workflow-swc-playground	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workflow-web	Ready	Preview, Comment	Apr 28, 2026 7:01pm

[changeset-bot]

🦋 Changeset detected

Latest commit: 072a4d0

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

This PR includes changesets to release 0 packages

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions]

🧪 E2E Test Results

✅ All tests passed

Summary

	Passed	Failed	Skipped	Total
✅ ▲ Vercel Production	978	0	67	1045
✅ 💻 Local Development	1054	0	86	1140
✅ 📦 Local Production	1054	0	86	1140
✅ 🐘 Local Postgres	1054	0	86	1140
✅ 🪟 Windows	95	0	0	95
✅ 📋 Other	267	0	18	285
Total	4502	0	343	4845

Details by Category

✅ ▲ Vercel Production

App	Passed	Failed	Skipped
✅ astro	88	0	7
✅ example	88	0	7
✅ express	88	0	7
✅ fastify	88	0	7
✅ hono	88	0	7
✅ nextjs-turbopack	93	0	2
✅ nextjs-webpack	93	0	2
✅ nitro	88	0	7
✅ nuxt	88	0	7
✅ sveltekit	88	0	7
✅ vite	88	0	7

✅ 💻 Local Development

App	Passed	Failed	Skipped
✅ astro-stable	89	0	6
✅ express-stable	89	0	6
✅ fastify-stable	89	0	6
✅ hono-stable	89	0	6
✅ nextjs-turbopack-canary	76	0	19
✅ nextjs-turbopack-stable	95	0	0
✅ nextjs-webpack-canary	76	0	19
✅ nextjs-webpack-stable	95	0	0
✅ nitro-stable	89	0	6
✅ nuxt-stable	89	0	6
✅ sveltekit-stable	89	0	6
✅ vite-stable	89	0	6

✅ 📦 Local Production

App	Passed	Failed	Skipped
✅ astro-stable	89	0	6
✅ express-stable	89	0	6
✅ fastify-stable	89	0	6
✅ hono-stable	89	0	6
✅ nextjs-turbopack-canary	76	0	19
✅ nextjs-turbopack-stable	95	0	0
✅ nextjs-webpack-canary	76	0	19
✅ nextjs-webpack-stable	95	0	0
✅ nitro-stable	89	0	6
✅ nuxt-stable	89	0	6
✅ sveltekit-stable	89	0	6
✅ vite-stable	89	0	6

✅ 🐘 Local Postgres

App	Passed	Failed	Skipped
✅ astro-stable	89	0	6
✅ express-stable	89	0	6
✅ fastify-stable	89	0	6
✅ hono-stable	89	0	6
✅ nextjs-turbopack-canary	76	0	19
✅ nextjs-turbopack-stable	95	0	0
✅ nextjs-webpack-canary	76	0	19
✅ nextjs-webpack-stable	95	0	0
✅ nitro-stable	89	0	6
✅ nuxt-stable	89	0	6
✅ sveltekit-stable	89	0	6
✅ vite-stable	89	0	6

✅ 🪟 Windows

App	Passed	Failed	Skipped
✅ nextjs-turbopack	95	0	0

✅ 📋 Other

App	Passed	Failed	Skipped
✅ e2e-local-dev-nest-stable	89	0	6
✅ e2e-local-postgres-nest-stable	89	0	6
✅ e2e-local-prod-nest-stable	89	0	6

---

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[github-actions]

📊 Benchmark Results

📈 Comparing against baseline from main branch. Green 🟢 = faster, Red 🔺 = slower.

workflow with no steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Express	0.040s (-9.3% 🟢)	1.005s (~)	0.965s	10	1.00x
💻 Local	Nitro	0.046s (+6.7% 🔺)	1.005s (~)	0.959s	10	1.14x
🐘 Postgres	Nitro	0.049s (-48.3% 🟢)	1.011s (-3.1%)	0.961s	10	1.22x
💻 Local	Next.js (Turbopack)	0.051s	1.005s	0.954s	10	1.27x
🐘 Postgres	Express	0.053s (-8.4% 🟢)	1.012s (~)	0.959s	10	1.32x
🐘 Postgres	Next.js (Turbopack)	0.057s	1.009s	0.952s	10	1.42x

workflow with 1 step

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Next.js (Turbopack)	1.120s	2.005s	0.886s	10	1.00x
💻 Local	Express	1.127s (~)	2.005s (~)	0.878s	10	1.01x
🐘 Postgres	Nitro	1.128s (-1.1%)	2.008s (~)	0.880s	10	1.01x
💻 Local	Nitro	1.137s (+0.5%)	2.006s (~)	0.869s	10	1.02x
🐘 Postgres	Express	1.144s (~)	2.010s (~)	0.867s	10	1.02x
🐘 Postgres	Next.js (Turbopack)	1.150s	2.012s	0.862s	10	1.03x

workflow with 10 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	10.770s (-0.9%)	11.023s (~)	0.253s	3	1.00x
🐘 Postgres	Express	10.787s (-1.6%)	11.025s (~)	0.238s	3	1.00x
💻 Local	Next.js (Turbopack)	10.789s	11.024s	0.235s	3	1.00x
🐘 Postgres	Next.js (Turbopack)	10.879s	11.025s	0.146s	3	1.01x
💻 Local	Express	10.922s (~)	11.023s (~)	0.100s	3	1.01x
💻 Local	Nitro	10.955s (~)	11.024s (~)	0.069s	3	1.02x

workflow with 25 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	14.344s (-1.6%)	15.034s (~)	0.691s	4	1.00x
🐘 Postgres	Next.js (Turbopack)	14.467s	15.023s	0.556s	4	1.01x
💻 Local	Next.js (Turbopack)	14.720s	15.030s	0.310s	4	1.03x
🐘 Postgres	Nitro	14.789s (+1.3%)	15.529s (+3.3%)	0.740s	4	1.03x
💻 Local	Express	14.980s (~)	15.029s (~)	0.049s	4	1.04x
💻 Local	Nitro	15.104s (~)	16.033s (~)	0.929s	4	1.05x

workflow with 50 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	13.522s (-3.5%)	14.029s (-3.9%)	0.507s	7	1.00x
🐘 Postgres	Next.js (Turbopack)	13.921s	14.022s	0.101s	7	1.03x
🐘 Postgres	Nitro	14.610s (+4.6%)	15.355s (+7.3% 🔺)	0.745s	6	1.08x
💻 Local	Next.js (Turbopack)	16.229s	17.032s	0.803s	6	1.20x
💻 Local	Express	16.828s (+1.4%)	17.198s (+1.0%)	0.370s	6	1.24x
💻 Local	Nitro	16.921s (+0.8%)	17.032s (~)	0.111s	6	1.25x

Promise.all with 10 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	1.203s (-5.6% 🟢)	2.010s (~)	0.807s	15	1.00x
🐘 Postgres	Next.js (Turbopack)	1.233s	2.010s	0.777s	15	1.03x
🐘 Postgres	Express	1.234s (-2.1%)	2.011s (~)	0.777s	15	1.03x
💻 Local	Next.js (Turbopack)	1.509s	2.006s	0.497s	15	1.25x
💻 Local	Express	1.526s (+2.5%)	2.006s (~)	0.480s	15	1.27x
💻 Local	Nitro	1.561s (-4.3%)	2.006s (-3.3%)	0.445s	15	1.30x

Promise.all with 25 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	2.304s (-2.0%)	3.026s (+0.6%)	0.722s	10	1.00x
🐘 Postgres	Express	2.376s (+0.6%)	3.011s (~)	0.635s	10	1.03x
🐘 Postgres	Next.js (Turbopack)	2.406s	3.009s	0.603s	10	1.04x
💻 Local	Next.js (Turbopack)	2.809s	3.454s	0.645s	9	1.22x
💻 Local	Nitro	3.045s (-3.1%)	3.453s (-11.1% 🟢)	0.407s	9	1.32x
💻 Local	Express	3.066s (+3.8%)	3.885s (+12.5% 🔺)	0.819s	8	1.33x

Promise.all with 50 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	3.494s (~)	4.014s (~)	0.520s	8	1.00x
🐘 Postgres	Nitro	3.496s (~)	4.026s (~)	0.530s	8	1.00x
🐘 Postgres	Next.js (Turbopack)	3.682s	4.011s	0.329s	8	1.05x
💻 Local	Next.js (Turbopack)	7.885s	8.519s	0.634s	4	2.26x
💻 Local	Express	8.294s (-0.5%)	9.022s (~)	0.728s	4	2.37x
💻 Local	Nitro	9.038s (+8.2% 🔺)	9.522s (+5.6% 🔺)	0.485s	4	2.59x

Promise.race with 10 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	1.206s (-4.0%)	2.007s (~)	0.801s	15	1.00x
🐘 Postgres	Next.js (Turbopack)	1.239s	2.010s	0.771s	15	1.03x
🐘 Postgres	Express	1.247s (-0.8%)	2.010s (~)	0.763s	15	1.03x
💻 Local	Next.js (Turbopack)	1.520s	2.006s	0.486s	15	1.26x
💻 Local	Nitro	1.566s (-16.1% 🟢)	2.006s (-14.3% 🟢)	0.440s	15	1.30x
💻 Local	Express	1.678s (-11.4% 🟢)	2.222s (-6.0% 🟢)	0.544s	14	1.39x

Promise.race with 25 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	2.270s (-3.0%)	3.007s (~)	0.737s	10	1.00x
🐘 Postgres	Express	2.342s (~)	3.009s (~)	0.667s	10	1.03x
🐘 Postgres	Next.js (Turbopack)	2.402s	3.010s	0.608s	10	1.06x
💻 Local	Next.js (Turbopack)	2.983s	3.760s	0.776s	8	1.31x
💻 Local	Nitro	3.004s (-2.0%)	3.760s (-3.3%)	0.756s	8	1.32x
💻 Local	Express	3.144s (~)	4.010s (+6.6% 🔺)	0.866s	8	1.39x

Promise.race with 50 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	3.416s (-1.9%)	4.008s (~)	0.593s	8	1.00x
🐘 Postgres	Express	3.448s (-1.5%)	4.011s (~)	0.563s	8	1.01x
🐘 Postgres	Next.js (Turbopack)	3.649s	4.014s	0.365s	8	1.07x
💻 Local	Next.js (Turbopack)	8.305s	9.021s	0.716s	4	2.43x
💻 Local	Express	8.866s (+0.7%)	9.273s (~)	0.406s	4	2.60x
💻 Local	Nitro	9.213s (+0.8%)	9.772s (-2.5%)	0.559s	4	2.70x

workflow with 10 sequential data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	0.714s (-15.0% 🟢)	1.007s (-1.6%)	0.293s	60	1.00x
🐘 Postgres	Next.js (Turbopack)	0.781s	1.006s	0.226s	60	1.09x
💻 Local	Next.js (Turbopack)	0.890s	1.039s	0.149s	58	1.25x
🐘 Postgres	Nitro	0.982s (+19.7% 🔺)	1.346s (+33.7% 🔺)	0.363s	45	1.38x
💻 Local	Nitro	1.014s (+3.4%)	1.720s (+57.2% 🔺)	0.706s	35	1.42x
💻 Local	Express	1.128s (+14.6% 🔺)	1.570s (+45.9% 🔺)	0.442s	39	1.58x

workflow with 25 sequential data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	1.698s (-14.1% 🟢)	2.009s (-11.0% 🟢)	0.311s	45	1.00x
🐘 Postgres	Nitro	1.728s (-10.3% 🟢)	2.100s (~)	0.372s	43	1.02x
🐘 Postgres	Next.js (Turbopack)	1.932s	2.173s	0.241s	42	1.14x
💻 Local	Next.js (Turbopack)	2.943s	3.223s	0.280s	28	1.73x
💻 Local	Express	3.035s (+0.6%)	3.586s (~)	0.550s	26	1.79x
💻 Local	Nitro	3.041s (~)	3.843s (+2.3%)	0.803s	24	1.79x

workflow with 50 sequential data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	3.431s (-16.4% 🟢)	4.108s (-10.8% 🟢)	0.678s	30	1.00x
🐘 Postgres	Express	3.498s (-12.3% 🟢)	4.012s (-8.2% 🟢)	0.514s	30	1.02x
🐘 Postgres	Next.js (Turbopack)	3.864s	4.045s	0.181s	30	1.13x
💻 Local	Next.js (Turbopack)	8.870s	9.161s	0.291s	14	2.59x
💻 Local	Nitro	9.175s (-1.3%)	9.787s (-2.3%)	0.613s	13	2.67x
💻 Local	Express	9.295s (+0.9%)	9.941s (-0.8%)	0.646s	13	2.71x

workflow with 10 concurrent data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	0.244s (-13.9% 🟢)	1.007s (~)	0.764s	60	1.00x
🐘 Postgres	Next.js (Turbopack)	0.248s	1.007s	0.759s	60	1.02x
🐘 Postgres	Express	0.261s (-7.6% 🟢)	1.008s (~)	0.747s	60	1.07x
💻 Local	Express	0.595s (+6.1% 🔺)	1.005s (~)	0.410s	60	2.44x
💻 Local	Nitro	0.599s (-1.0%)	1.005s (-1.6%)	0.406s	60	2.46x
💻 Local	Next.js (Turbopack)	0.607s	1.022s	0.415s	59	2.49x

workflow with 25 concurrent data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	0.409s (-19.7% 🟢)	1.007s (~)	0.598s	90	1.00x
🐘 Postgres	Nitro	0.426s (-14.1% 🟢)	1.009s (~)	0.583s	90	1.04x
🐘 Postgres	Next.js (Turbopack)	0.504s	1.007s	0.503s	90	1.23x
💻 Local	Nitro	2.548s (~)	3.009s (~)	0.461s	30	6.23x
💻 Local	Next.js (Turbopack)	2.681s	3.009s	0.328s	30	6.55x
💻 Local	Express	2.844s (+13.1% 🔺)	3.472s (+15.4% 🔺)	0.629s	26	6.95x

workflow with 50 concurrent data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	0.654s (-20.1% 🟢)	1.016s (~)	0.362s	119	1.00x
🐘 Postgres	Nitro	0.657s (-16.8% 🟢)	1.054s (+4.7%)	0.397s	114	1.01x
🐘 Postgres	Next.js (Turbopack)	0.820s	1.016s	0.196s	119	1.25x
💻 Local	Nitro	11.257s (+0.6%)	11.938s (+2.3%)	0.681s	11	17.21x
💻 Local	Next.js (Turbopack)	11.270s	11.847s	0.577s	11	17.23x
💻 Local	Express	12.606s (+12.7% 🔺)	13.033s (+9.1% 🔺)	0.426s	10	19.28x

Stream Benchmarks(includes TTFB metrics)

workflow with stream

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Next.js (Turbopack)	0.180s	1.002s	0.013s	1.019s	0.839s	10	1.00x
🐘 Postgres	Next.js (Turbopack)	0.198s	1.000s	0.001s	1.010s	0.812s	10	1.10x
💻 Local	Express	0.201s (+0.8%)	1.005s (~)	0.012s (-0.8%)	1.018s (~)	0.818s	10	1.12x
💻 Local	Nitro	0.209s (-2.2%)	1.004s (~)	0.013s (+3.2%)	1.019s (~)	0.810s	10	1.16x
🐘 Postgres	Express	0.255s (+24.3% 🔺)	1.000s (~)	0.045s (+2712.5% 🔺)	1.056s (+4.4%)	0.801s	10	1.42x
🐘 Postgres	Nitro	0.330s (+60.9% 🔺)	1.008s (+0.8%)	0.124s (+8166.7% 🔺)	1.159s (+14.6% 🔺)	0.829s	10	1.84x

stream pipeline with 5 transform steps (1MB)

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	0.585s (-6.3% 🟢)	1.040s (+3.3%)	0.032s (+667.7% 🔺)	1.083s (+5.9% 🔺)	0.499s	56	1.00x
🐘 Postgres	Express	0.600s (-4.7%)	1.008s (~)	0.005s (+32.7% 🔺)	1.025s (~)	0.425s	59	1.03x
🐘 Postgres	Next.js (Turbopack)	0.650s	1.026s	0.007s	1.042s	0.392s	58	1.11x
💻 Local	Next.js (Turbopack)	0.680s	1.011s	0.009s	1.023s	0.343s	59	1.16x
💻 Local	Express	0.825s (+8.9% 🔺)	1.013s (-1.5%)	0.015s (+59.3% 🔺)	1.030s (-0.9%)	0.206s	59	1.41x
💻 Local	Nitro	0.847s (+0.9%)	1.012s (~)	0.010s (+4.2%)	1.116s (~)	0.269s	54	1.45x

10 parallel streams (1MB each)

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Next.js (Turbopack)	0.965s	1.250s	0.000s	1.264s	0.299s	48	1.00x
🐘 Postgres	Express	1.015s (+5.6% 🔺)	1.463s (+14.5% 🔺)	0.000s (-43.9% 🟢)	1.478s (+13.1% 🔺)	0.463s	41	1.05x
🐘 Postgres	Nitro	1.144s (+18.1% 🔺)	1.461s (+17.1% 🔺)	0.000s (-41.5% 🟢)	1.481s (+17.7% 🔺)	0.336s	41	1.19x
💻 Local	Nitro	1.252s (+2.4%)	2.022s (~)	0.000s (+266.7% 🔺)	2.024s (~)	0.772s	30	1.30x
💻 Local	Next.js (Turbopack)	1.309s	2.020s	0.000s	2.023s	0.714s	30	1.36x
💻 Local	Express	1.374s (+12.2% 🔺)	2.022s (~)	0.001s (+60.0% 🔺)	2.025s (~)	0.651s	30	1.42x

fan-out fan-in 10 streams (1MB each)

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	1.888s (+6.5% 🔺)	2.312s (+6.2% 🔺)	0.000s (NaN%)	2.331s (+6.0% 🔺)	0.443s	26	1.00x
🐘 Postgres	Next.js (Turbopack)	1.890s	2.146s	0.000s	2.153s	0.264s	28	1.00x
🐘 Postgres	Nitro	1.917s (+7.0% 🔺)	2.465s (+15.1% 🔺)	0.000s (-100.0% 🟢)	2.532s (+16.4% 🔺)	0.615s	25	1.02x
💻 Local	Next.js (Turbopack)	3.662s	4.032s	0.001s	4.038s	0.376s	15	1.94x
💻 Local	Nitro	3.709s (+9.5% 🔺)	4.234s (+5.0% 🔺)	0.000s (-25.0% 🟢)	4.236s (+5.0%)	0.528s	15	1.96x
💻 Local	Express	4.304s (+24.1% 🔺)	4.423s (+9.7% 🔺)	0.000s (-42.3% 🟢)	4.812s (+19.2% 🔺)	0.507s	13	2.28x

Summary

Fastest Framework by World

Winner determined by most benchmark wins

World	🥇 Fastest Framework	Wins
💻 Local	Next.js (Turbopack)	16/21
🐘 Postgres	Nitro	11/21

Fastest World by Framework

Winner determined by most benchmark wins

Framework	🥇 Fastest World	Wins
Express	🐘 Postgres	18/21
Next.js (Turbopack)	🐘 Postgres	17/21
Nitro	🐘 Postgres	19/21

Column Definitions

• Workflow Time: Runtime reported by workflow (completedAt - createdAt) - primary metric
• TTFB: Time to First Byte - time from workflow start until first stream byte received (stream benchmarks only)
• Slurp: Time from first byte to complete stream consumption (stream benchmarks only)
• Wall Time: Total testbench time (trigger workflow + poll for result)
• Overhead: Testbench overhead (Wall Time - Workflow Time)
• Samples: Number of benchmark iterations run
• vs Fastest: How much slower compared to the fastest configuration for this benchmark

Worlds:

• 💻 Local: In-memory filesystem world (local development)
• 🐘 Postgres: PostgreSQL database world (local development)
• ▲ Vercel: Vercel production/preview deployment
• 🌐 Turso: Community world (local development)
• 🌐 MongoDB: Community world (local development)
• 🌐 Redis: Community world (local development)
• 🌐 Jazz: Community world (local development)

---

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[Copilot]

Pull request overview

Adjusts the e2e “step error preserves stack trace” assertions for Vite local dev after the Vite upgrade started preserving step bundle source maps in dev mode.

Changes:

• Update hasStepSourceMaps() to allow Vite local dev to assert original source filenames in stacks (while keeping local prod behavior unchanged).
• Add an (empty) changeset note documenting the Vite local-dev e2e fix.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
packages/core/e2e/utils.ts	Refines step sourcemap support matrix so Vite local dev no longer disables stack source assertions.
.changeset/fix-vite-step-source-maps-e2e.md	Documents the reason for the Vite local-dev e2e assertion change.

---

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[TooTallNate]

Summary

• Vite local-dev e2e tests basic step error preserves message and stack trace and cross-file step error preserves message and function names in stack have been failing consistently since #1827 bumped workbench/vite from vite@^7.1.12 to vite@^7.3.2.
• The newer vite preserves step bundle source maps in dev mode, so stack traces now point at original files (99_e2e.ts, helpers.ts). However, hasStepSourceMaps() in packages/core/e2e/utils.ts still hard-codes vite as having no step source maps in any local environment, so the assertion expect(stack).not.toContain('99_e2e.ts') fails.
• Fix: drop the vite-specific block in hasStepSourceMaps() entirely. Vite local dev now falls through to the default return true, while vite local prod is still caught by the existing !DEV_TEST_CONFIG guard further down — so local-prod behavior is unchanged.

Why this took 6 days to surface

1. The push for [workflow] Bump Vite #1827 had Local Dev tests skipped due to matrix selection at the time.
2. The next push (Lock next@canary test version #1860) introduced a CI env-var bug that prevented Local Dev tests from running at all.
3. ci: fix VERCEL_WORKFLOW_SERVER_* env var ternary on main #1859 (28dc089e) fixed the env-var bug, finally letting vite local dev run — and it surfaced this assertion failure.

Reference failing run: https://github.com/vercel/workflow/actions/runs/25067758534/job/73444472541

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
example-nextjs-workflow-turbopack	Ready	Preview, Comment	Apr 28, 2026 7:01pm
example-nextjs-workflow-webpack	Ready	Preview, Comment	Apr 28, 2026 7:01pm
example-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-astro-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-express-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-fastify-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-hono-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-nitro-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-nuxt-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-sveltekit-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-vite-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workflow-docs	Ready	Preview, Comment, Open in v0	Apr 28, 2026 7:01pm
workflow-swc-playground	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workflow-web	Ready	Preview, Comment	Apr 28, 2026 7:01pm

[changeset-bot]

🦋 Changeset detected

Latest commit: 072a4d0

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

This PR includes changesets to release 0 packages

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions]

🧪 E2E Test Results

✅ All tests passed

Summary

	Passed	Failed	Skipped	Total
✅ ▲ Vercel Production	978	0	67	1045
✅ 💻 Local Development	1054	0	86	1140
✅ 📦 Local Production	1054	0	86	1140
✅ 🐘 Local Postgres	1054	0	86	1140
✅ 🪟 Windows	95	0	0	95
✅ 📋 Other	267	0	18	285
Total	4502	0	343	4845

Details by Category

✅ ▲ Vercel Production

App	Passed	Failed	Skipped
✅ astro	88	0	7
✅ example	88	0	7
✅ express	88	0	7
✅ fastify	88	0	7
✅ hono	88	0	7
✅ nextjs-turbopack	93	0	2
✅ nextjs-webpack	93	0	2
✅ nitro	88	0	7
✅ nuxt	88	0	7
✅ sveltekit	88	0	7
✅ vite	88	0	7

✅ 💻 Local Development

App	Passed	Failed	Skipped
✅ astro-stable	89	0	6
✅ express-stable	89	0	6
✅ fastify-stable	89	0	6
✅ hono-stable	89	0	6
✅ nextjs-turbopack-canary	76	0	19
✅ nextjs-turbopack-stable	95	0	0
✅ nextjs-webpack-canary	76	0	19
✅ nextjs-webpack-stable	95	0	0
✅ nitro-stable	89	0	6
✅ nuxt-stable	89	0	6
✅ sveltekit-stable	89	0	6
✅ vite-stable	89	0	6

✅ 📦 Local Production

App	Passed	Failed	Skipped
✅ astro-stable	89	0	6
✅ express-stable	89	0	6
✅ fastify-stable	89	0	6
✅ hono-stable	89	0	6
✅ nextjs-turbopack-canary	76	0	19
✅ nextjs-turbopack-stable	95	0	0
✅ nextjs-webpack-canary	76	0	19
✅ nextjs-webpack-stable	95	0	0
✅ nitro-stable	89	0	6
✅ nuxt-stable	89	0	6
✅ sveltekit-stable	89	0	6
✅ vite-stable	89	0	6

✅ 🐘 Local Postgres

App	Passed	Failed	Skipped
✅ astro-stable	89	0	6
✅ express-stable	89	0	6
✅ fastify-stable	89	0	6
✅ hono-stable	89	0	6
✅ nextjs-turbopack-canary	76	0	19
✅ nextjs-turbopack-stable	95	0	0
✅ nextjs-webpack-canary	76	0	19
✅ nextjs-webpack-stable	95	0	0
✅ nitro-stable	89	0	6
✅ nuxt-stable	89	0	6
✅ sveltekit-stable	89	0	6
✅ vite-stable	89	0	6

✅ 🪟 Windows

App	Passed	Failed	Skipped
✅ nextjs-turbopack	95	0	0

✅ 📋 Other

App	Passed	Failed	Skipped
✅ e2e-local-dev-nest-stable	89	0	6
✅ e2e-local-postgres-nest-stable	89	0	6
✅ e2e-local-prod-nest-stable	89	0	6

---

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[github-actions]

📊 Benchmark Results

📈 Comparing against baseline from main branch. Green 🟢 = faster, Red 🔺 = slower.

workflow with no steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Express	0.040s (-9.3% 🟢)	1.005s (~)	0.965s	10	1.00x
💻 Local	Nitro	0.046s (+6.7% 🔺)	1.005s (~)	0.959s	10	1.14x
🐘 Postgres	Nitro	0.049s (-48.3% 🟢)	1.011s (-3.1%)	0.961s	10	1.22x
💻 Local	Next.js (Turbopack)	0.051s	1.005s	0.954s	10	1.27x
🐘 Postgres	Express	0.053s (-8.4% 🟢)	1.012s (~)	0.959s	10	1.32x
🐘 Postgres	Next.js (Turbopack)	0.057s	1.009s	0.952s	10	1.42x

workflow with 1 step

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Next.js (Turbopack)	1.120s	2.005s	0.886s	10	1.00x
💻 Local	Express	1.127s (~)	2.005s (~)	0.878s	10	1.01x
🐘 Postgres	Nitro	1.128s (-1.1%)	2.008s (~)	0.880s	10	1.01x
💻 Local	Nitro	1.137s (+0.5%)	2.006s (~)	0.869s	10	1.02x
🐘 Postgres	Express	1.144s (~)	2.010s (~)	0.867s	10	1.02x
🐘 Postgres	Next.js (Turbopack)	1.150s	2.012s	0.862s	10	1.03x

workflow with 10 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	10.770s (-0.9%)	11.023s (~)	0.253s	3	1.00x
🐘 Postgres	Express	10.787s (-1.6%)	11.025s (~)	0.238s	3	1.00x
💻 Local	Next.js (Turbopack)	10.789s	11.024s	0.235s	3	1.00x
🐘 Postgres	Next.js (Turbopack)	10.879s	11.025s	0.146s	3	1.01x
💻 Local	Express	10.922s (~)	11.023s (~)	0.100s	3	1.01x
💻 Local	Nitro	10.955s (~)	11.024s (~)	0.069s	3	1.02x

workflow with 25 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	14.344s (-1.6%)	15.034s (~)	0.691s	4	1.00x
🐘 Postgres	Next.js (Turbopack)	14.467s	15.023s	0.556s	4	1.01x
💻 Local	Next.js (Turbopack)	14.720s	15.030s	0.310s	4	1.03x
🐘 Postgres	Nitro	14.789s (+1.3%)	15.529s (+3.3%)	0.740s	4	1.03x
💻 Local	Express	14.980s (~)	15.029s (~)	0.049s	4	1.04x
💻 Local	Nitro	15.104s (~)	16.033s (~)	0.929s	4	1.05x

workflow with 50 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	13.522s (-3.5%)	14.029s (-3.9%)	0.507s	7	1.00x
🐘 Postgres	Next.js (Turbopack)	13.921s	14.022s	0.101s	7	1.03x
🐘 Postgres	Nitro	14.610s (+4.6%)	15.355s (+7.3% 🔺)	0.745s	6	1.08x
💻 Local	Next.js (Turbopack)	16.229s	17.032s	0.803s	6	1.20x
💻 Local	Express	16.828s (+1.4%)	17.198s (+1.0%)	0.370s	6	1.24x
💻 Local	Nitro	16.921s (+0.8%)	17.032s (~)	0.111s	6	1.25x

Promise.all with 10 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	1.203s (-5.6% 🟢)	2.010s (~)	0.807s	15	1.00x
🐘 Postgres	Next.js (Turbopack)	1.233s	2.010s	0.777s	15	1.03x
🐘 Postgres	Express	1.234s (-2.1%)	2.011s (~)	0.777s	15	1.03x
💻 Local	Next.js (Turbopack)	1.509s	2.006s	0.497s	15	1.25x
💻 Local	Express	1.526s (+2.5%)	2.006s (~)	0.480s	15	1.27x
💻 Local	Nitro	1.561s (-4.3%)	2.006s (-3.3%)	0.445s	15	1.30x

Promise.all with 25 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	2.304s (-2.0%)	3.026s (+0.6%)	0.722s	10	1.00x
🐘 Postgres	Express	2.376s (+0.6%)	3.011s (~)	0.635s	10	1.03x
🐘 Postgres	Next.js (Turbopack)	2.406s	3.009s	0.603s	10	1.04x
💻 Local	Next.js (Turbopack)	2.809s	3.454s	0.645s	9	1.22x
💻 Local	Nitro	3.045s (-3.1%)	3.453s (-11.1% 🟢)	0.407s	9	1.32x
💻 Local	Express	3.066s (+3.8%)	3.885s (+12.5% 🔺)	0.819s	8	1.33x

Promise.all with 50 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	3.494s (~)	4.014s (~)	0.520s	8	1.00x
🐘 Postgres	Nitro	3.496s (~)	4.026s (~)	0.530s	8	1.00x
🐘 Postgres	Next.js (Turbopack)	3.682s	4.011s	0.329s	8	1.05x
💻 Local	Next.js (Turbopack)	7.885s	8.519s	0.634s	4	2.26x
💻 Local	Express	8.294s (-0.5%)	9.022s (~)	0.728s	4	2.37x
💻 Local	Nitro	9.038s (+8.2% 🔺)	9.522s (+5.6% 🔺)	0.485s	4	2.59x

Promise.race with 10 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	1.206s (-4.0%)	2.007s (~)	0.801s	15	1.00x
🐘 Postgres	Next.js (Turbopack)	1.239s	2.010s	0.771s	15	1.03x
🐘 Postgres	Express	1.247s (-0.8%)	2.010s (~)	0.763s	15	1.03x
💻 Local	Next.js (Turbopack)	1.520s	2.006s	0.486s	15	1.26x
💻 Local	Nitro	1.566s (-16.1% 🟢)	2.006s (-14.3% 🟢)	0.440s	15	1.30x
💻 Local	Express	1.678s (-11.4% 🟢)	2.222s (-6.0% 🟢)	0.544s	14	1.39x

Promise.race with 25 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	2.270s (-3.0%)	3.007s (~)	0.737s	10	1.00x
🐘 Postgres	Express	2.342s (~)	3.009s (~)	0.667s	10	1.03x
🐘 Postgres	Next.js (Turbopack)	2.402s	3.010s	0.608s	10	1.06x
💻 Local	Next.js (Turbopack)	2.983s	3.760s	0.776s	8	1.31x
💻 Local	Nitro	3.004s (-2.0%)	3.760s (-3.3%)	0.756s	8	1.32x
💻 Local	Express	3.144s (~)	4.010s (+6.6% 🔺)	0.866s	8	1.39x

Promise.race with 50 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	3.416s (-1.9%)	4.008s (~)	0.593s	8	1.00x
🐘 Postgres	Express	3.448s (-1.5%)	4.011s (~)	0.563s	8	1.01x
🐘 Postgres	Next.js (Turbopack)	3.649s	4.014s	0.365s	8	1.07x
💻 Local	Next.js (Turbopack)	8.305s	9.021s	0.716s	4	2.43x
💻 Local	Express	8.866s (+0.7%)	9.273s (~)	0.406s	4	2.60x
💻 Local	Nitro	9.213s (+0.8%)	9.772s (-2.5%)	0.559s	4	2.70x

workflow with 10 sequential data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	0.714s (-15.0% 🟢)	1.007s (-1.6%)	0.293s	60	1.00x
🐘 Postgres	Next.js (Turbopack)	0.781s	1.006s	0.226s	60	1.09x
💻 Local	Next.js (Turbopack)	0.890s	1.039s	0.149s	58	1.25x
🐘 Postgres	Nitro	0.982s (+19.7% 🔺)	1.346s (+33.7% 🔺)	0.363s	45	1.38x
💻 Local	Nitro	1.014s (+3.4%)	1.720s (+57.2% 🔺)	0.706s	35	1.42x
💻 Local	Express	1.128s (+14.6% 🔺)	1.570s (+45.9% 🔺)	0.442s	39	1.58x

workflow with 25 sequential data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	1.698s (-14.1% 🟢)	2.009s (-11.0% 🟢)	0.311s	45	1.00x
🐘 Postgres	Nitro	1.728s (-10.3% 🟢)	2.100s (~)	0.372s	43	1.02x
🐘 Postgres	Next.js (Turbopack)	1.932s	2.173s	0.241s	42	1.14x
💻 Local	Next.js (Turbopack)	2.943s	3.223s	0.280s	28	1.73x
💻 Local	Express	3.035s (+0.6%)	3.586s (~)	0.550s	26	1.79x
💻 Local	Nitro	3.041s (~)	3.843s (+2.3%)	0.803s	24	1.79x

workflow with 50 sequential data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	3.431s (-16.4% 🟢)	4.108s (-10.8% 🟢)	0.678s	30	1.00x
🐘 Postgres	Express	3.498s (-12.3% 🟢)	4.012s (-8.2% 🟢)	0.514s	30	1.02x
🐘 Postgres	Next.js (Turbopack)	3.864s	4.045s	0.181s	30	1.13x
💻 Local	Next.js (Turbopack)	8.870s	9.161s	0.291s	14	2.59x
💻 Local	Nitro	9.175s (-1.3%)	9.787s (-2.3%)	0.613s	13	2.67x
💻 Local	Express	9.295s (+0.9%)	9.941s (-0.8%)	0.646s	13	2.71x

workflow with 10 concurrent data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	0.244s (-13.9% 🟢)	1.007s (~)	0.764s	60	1.00x
🐘 Postgres	Next.js (Turbopack)	0.248s	1.007s	0.759s	60	1.02x
🐘 Postgres	Express	0.261s (-7.6% 🟢)	1.008s (~)	0.747s	60	1.07x
💻 Local	Express	0.595s (+6.1% 🔺)	1.005s (~)	0.410s	60	2.44x
💻 Local	Nitro	0.599s (-1.0%)	1.005s (-1.6%)	0.406s	60	2.46x
💻 Local	Next.js (Turbopack)	0.607s	1.022s	0.415s	59	2.49x

workflow with 25 concurrent data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	0.409s (-19.7% 🟢)	1.007s (~)	0.598s	90	1.00x
🐘 Postgres	Nitro	0.426s (-14.1% 🟢)	1.009s (~)	0.583s	90	1.04x
🐘 Postgres	Next.js (Turbopack)	0.504s	1.007s	0.503s	90	1.23x
💻 Local	Nitro	2.548s (~)	3.009s (~)	0.461s	30	6.23x
💻 Local	Next.js (Turbopack)	2.681s	3.009s	0.328s	30	6.55x
💻 Local	Express	2.844s (+13.1% 🔺)	3.472s (+15.4% 🔺)	0.629s	26	6.95x

workflow with 50 concurrent data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	0.654s (-20.1% 🟢)	1.016s (~)	0.362s	119	1.00x
🐘 Postgres	Nitro	0.657s (-16.8% 🟢)	1.054s (+4.7%)	0.397s	114	1.01x
🐘 Postgres	Next.js (Turbopack)	0.820s	1.016s	0.196s	119	1.25x
💻 Local	Nitro	11.257s (+0.6%)	11.938s (+2.3%)	0.681s	11	17.21x
💻 Local	Next.js (Turbopack)	11.270s	11.847s	0.577s	11	17.23x
💻 Local	Express	12.606s (+12.7% 🔺)	13.033s (+9.1% 🔺)	0.426s	10	19.28x

Stream Benchmarks(includes TTFB metrics)

workflow with stream

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Next.js (Turbopack)	0.180s	1.002s	0.013s	1.019s	0.839s	10	1.00x
🐘 Postgres	Next.js (Turbopack)	0.198s	1.000s	0.001s	1.010s	0.812s	10	1.10x
💻 Local	Express	0.201s (+0.8%)	1.005s (~)	0.012s (-0.8%)	1.018s (~)	0.818s	10	1.12x
💻 Local	Nitro	0.209s (-2.2%)	1.004s (~)	0.013s (+3.2%)	1.019s (~)	0.810s	10	1.16x
🐘 Postgres	Express	0.255s (+24.3% 🔺)	1.000s (~)	0.045s (+2712.5% 🔺)	1.056s (+4.4%)	0.801s	10	1.42x
🐘 Postgres	Nitro	0.330s (+60.9% 🔺)	1.008s (+0.8%)	0.124s (+8166.7% 🔺)	1.159s (+14.6% 🔺)	0.829s	10	1.84x

stream pipeline with 5 transform steps (1MB)

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	0.585s (-6.3% 🟢)	1.040s (+3.3%)	0.032s (+667.7% 🔺)	1.083s (+5.9% 🔺)	0.499s	56	1.00x
🐘 Postgres	Express	0.600s (-4.7%)	1.008s (~)	0.005s (+32.7% 🔺)	1.025s (~)	0.425s	59	1.03x
🐘 Postgres	Next.js (Turbopack)	0.650s	1.026s	0.007s	1.042s	0.392s	58	1.11x
💻 Local	Next.js (Turbopack)	0.680s	1.011s	0.009s	1.023s	0.343s	59	1.16x
💻 Local	Express	0.825s (+8.9% 🔺)	1.013s (-1.5%)	0.015s (+59.3% 🔺)	1.030s (-0.9%)	0.206s	59	1.41x
💻 Local	Nitro	0.847s (+0.9%)	1.012s (~)	0.010s (+4.2%)	1.116s (~)	0.269s	54	1.45x

10 parallel streams (1MB each)

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Next.js (Turbopack)	0.965s	1.250s	0.000s	1.264s	0.299s	48	1.00x
🐘 Postgres	Express	1.015s (+5.6% 🔺)	1.463s (+14.5% 🔺)	0.000s (-43.9% 🟢)	1.478s (+13.1% 🔺)	0.463s	41	1.05x
🐘 Postgres	Nitro	1.144s (+18.1% 🔺)	1.461s (+17.1% 🔺)	0.000s (-41.5% 🟢)	1.481s (+17.7% 🔺)	0.336s	41	1.19x
💻 Local	Nitro	1.252s (+2.4%)	2.022s (~)	0.000s (+266.7% 🔺)	2.024s (~)	0.772s	30	1.30x
💻 Local	Next.js (Turbopack)	1.309s	2.020s	0.000s	2.023s	0.714s	30	1.36x
💻 Local	Express	1.374s (+12.2% 🔺)	2.022s (~)	0.001s (+60.0% 🔺)	2.025s (~)	0.651s	30	1.42x

fan-out fan-in 10 streams (1MB each)

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	1.888s (+6.5% 🔺)	2.312s (+6.2% 🔺)	0.000s (NaN%)	2.331s (+6.0% 🔺)	0.443s	26	1.00x
🐘 Postgres	Next.js (Turbopack)	1.890s	2.146s	0.000s	2.153s	0.264s	28	1.00x
🐘 Postgres	Nitro	1.917s (+7.0% 🔺)	2.465s (+15.1% 🔺)	0.000s (-100.0% 🟢)	2.532s (+16.4% 🔺)	0.615s	25	1.02x
💻 Local	Next.js (Turbopack)	3.662s	4.032s	0.001s	4.038s	0.376s	15	1.94x
💻 Local	Nitro	3.709s (+9.5% 🔺)	4.234s (+5.0% 🔺)	0.000s (-25.0% 🟢)	4.236s (+5.0%)	0.528s	15	1.96x
💻 Local	Express	4.304s (+24.1% 🔺)	4.423s (+9.7% 🔺)	0.000s (-42.3% 🟢)	4.812s (+19.2% 🔺)	0.507s	13	2.28x

Summary

Fastest Framework by World

Winner determined by most benchmark wins

World	🥇 Fastest Framework	Wins
💻 Local	Next.js (Turbopack)	16/21
🐘 Postgres	Nitro	11/21

Fastest World by Framework

Winner determined by most benchmark wins

Framework	🥇 Fastest World	Wins
Express	🐘 Postgres	18/21
Next.js (Turbopack)	🐘 Postgres	17/21
Nitro	🐘 Postgres	19/21

Column Definitions

• Workflow Time: Runtime reported by workflow (completedAt - createdAt) - primary metric
• TTFB: Time to First Byte - time from workflow start until first stream byte received (stream benchmarks only)
• Slurp: Time from first byte to complete stream consumption (stream benchmarks only)
• Wall Time: Total testbench time (trigger workflow + poll for result)
• Overhead: Testbench overhead (Wall Time - Workflow Time)
• Samples: Number of benchmark iterations run
• vs Fastest: How much slower compared to the fastest configuration for this benchmark

Worlds:

• 💻 Local: In-memory filesystem world (local development)
• 🐘 Postgres: PostgreSQL database world (local development)
• ▲ Vercel: Vercel production/preview deployment
• 🌐 Turso: Community world (local development)
• 🌐 MongoDB: Community world (local development)
• 🌐 Redis: Community world (local development)
• 🌐 Jazz: Community world (local development)

---

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[Copilot]

Pull request overview

Adjusts the e2e “step error preserves stack trace” assertions for Vite local dev after the Vite upgrade started preserving step bundle source maps in dev mode.

Changes:

• Update hasStepSourceMaps() to allow Vite local dev to assert original source filenames in stacks (while keeping local prod behavior unchanged).
• Add an (empty) changeset note documenting the Vite local-dev e2e fix.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
packages/core/e2e/utils.ts	Refines step sourcemap support matrix so Vite local dev no longer disables stack source assertions.
.changeset/fix-vite-step-source-maps-e2e.md	Documents the reason for the Vite local-dev e2e assertion change.

---

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[TooTallNate]

Summary

• Vite local-dev e2e tests basic step error preserves message and stack trace and cross-file step error preserves message and function names in stack have been failing consistently since #1827 bumped workbench/vite from vite@^7.1.12 to vite@^7.3.2.
• The newer vite preserves step bundle source maps in dev mode, so stack traces now point at original files (99_e2e.ts, helpers.ts). However, hasStepSourceMaps() in packages/core/e2e/utils.ts still hard-codes vite as having no step source maps in any local environment, so the assertion expect(stack).not.toContain('99_e2e.ts') fails.
• Fix: drop the vite-specific block in hasStepSourceMaps() entirely. Vite local dev now falls through to the default return true, while vite local prod is still caught by the existing !DEV_TEST_CONFIG guard further down — so local-prod behavior is unchanged.

Why this took 6 days to surface

1. The push for [workflow] Bump Vite #1827 had Local Dev tests skipped due to matrix selection at the time.
2. The next push (Lock next@canary test version #1860) introduced a CI env-var bug that prevented Local Dev tests from running at all.
3. ci: fix VERCEL_WORKFLOW_SERVER_* env var ternary on main #1859 (28dc089e) fixed the env-var bug, finally letting vite local dev run — and it surfaced this assertion failure.

Reference failing run: https://github.com/vercel/workflow/actions/runs/25067758534/job/73444472541

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
example-nextjs-workflow-turbopack	Ready	Preview, Comment	Apr 28, 2026 7:01pm
example-nextjs-workflow-webpack	Ready	Preview, Comment	Apr 28, 2026 7:01pm
example-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-astro-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-express-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-fastify-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-hono-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-nitro-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-nuxt-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-sveltekit-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workbench-vite-workflow	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workflow-docs	Ready	Preview, Comment, Open in v0	Apr 28, 2026 7:01pm
workflow-swc-playground	Ready	Preview, Comment	Apr 28, 2026 7:01pm
workflow-web	Ready	Preview, Comment	Apr 28, 2026 7:01pm

[changeset-bot]

🦋 Changeset detected

Latest commit: 072a4d0

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

This PR includes changesets to release 0 packages

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[github-actions]

🧪 E2E Test Results

✅ All tests passed

Summary

	Passed	Failed	Skipped	Total
✅ ▲ Vercel Production	978	0	67	1045
✅ 💻 Local Development	1054	0	86	1140
✅ 📦 Local Production	1054	0	86	1140
✅ 🐘 Local Postgres	1054	0	86	1140
✅ 🪟 Windows	95	0	0	95
✅ 📋 Other	267	0	18	285
Total	4502	0	343	4845

Details by Category

✅ ▲ Vercel Production

App	Passed	Failed	Skipped
✅ astro	88	0	7
✅ example	88	0	7
✅ express	88	0	7
✅ fastify	88	0	7
✅ hono	88	0	7
✅ nextjs-turbopack	93	0	2
✅ nextjs-webpack	93	0	2
✅ nitro	88	0	7
✅ nuxt	88	0	7
✅ sveltekit	88	0	7
✅ vite	88	0	7

✅ 💻 Local Development

App	Passed	Failed	Skipped
✅ astro-stable	89	0	6
✅ express-stable	89	0	6
✅ fastify-stable	89	0	6
✅ hono-stable	89	0	6
✅ nextjs-turbopack-canary	76	0	19
✅ nextjs-turbopack-stable	95	0	0
✅ nextjs-webpack-canary	76	0	19
✅ nextjs-webpack-stable	95	0	0
✅ nitro-stable	89	0	6
✅ nuxt-stable	89	0	6
✅ sveltekit-stable	89	0	6
✅ vite-stable	89	0	6

✅ 📦 Local Production

App	Passed	Failed	Skipped
✅ astro-stable	89	0	6
✅ express-stable	89	0	6
✅ fastify-stable	89	0	6
✅ hono-stable	89	0	6
✅ nextjs-turbopack-canary	76	0	19
✅ nextjs-turbopack-stable	95	0	0
✅ nextjs-webpack-canary	76	0	19
✅ nextjs-webpack-stable	95	0	0
✅ nitro-stable	89	0	6
✅ nuxt-stable	89	0	6
✅ sveltekit-stable	89	0	6
✅ vite-stable	89	0	6

✅ 🐘 Local Postgres

App	Passed	Failed	Skipped
✅ astro-stable	89	0	6
✅ express-stable	89	0	6
✅ fastify-stable	89	0	6
✅ hono-stable	89	0	6
✅ nextjs-turbopack-canary	76	0	19
✅ nextjs-turbopack-stable	95	0	0
✅ nextjs-webpack-canary	76	0	19
✅ nextjs-webpack-stable	95	0	0
✅ nitro-stable	89	0	6
✅ nuxt-stable	89	0	6
✅ sveltekit-stable	89	0	6
✅ vite-stable	89	0	6

✅ 🪟 Windows

App	Passed	Failed	Skipped
✅ nextjs-turbopack	95	0	0

✅ 📋 Other

App	Passed	Failed	Skipped
✅ e2e-local-dev-nest-stable	89	0	6
✅ e2e-local-postgres-nest-stable	89	0	6
✅ e2e-local-prod-nest-stable	89	0	6

---

📋 View full workflow run

[github-actions]

📊 Benchmark Results

📈 Comparing against baseline from main branch. Green 🟢 = faster, Red 🔺 = slower.

workflow with no steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Express	0.040s (-9.3% 🟢)	1.005s (~)	0.965s	10	1.00x
💻 Local	Nitro	0.046s (+6.7% 🔺)	1.005s (~)	0.959s	10	1.14x
🐘 Postgres	Nitro	0.049s (-48.3% 🟢)	1.011s (-3.1%)	0.961s	10	1.22x
💻 Local	Next.js (Turbopack)	0.051s	1.005s	0.954s	10	1.27x
🐘 Postgres	Express	0.053s (-8.4% 🟢)	1.012s (~)	0.959s	10	1.32x
🐘 Postgres	Next.js (Turbopack)	0.057s	1.009s	0.952s	10	1.42x

workflow with 1 step

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Next.js (Turbopack)	1.120s	2.005s	0.886s	10	1.00x
💻 Local	Express	1.127s (~)	2.005s (~)	0.878s	10	1.01x
🐘 Postgres	Nitro	1.128s (-1.1%)	2.008s (~)	0.880s	10	1.01x
💻 Local	Nitro	1.137s (+0.5%)	2.006s (~)	0.869s	10	1.02x
🐘 Postgres	Express	1.144s (~)	2.010s (~)	0.867s	10	1.02x
🐘 Postgres	Next.js (Turbopack)	1.150s	2.012s	0.862s	10	1.03x

workflow with 10 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	10.770s (-0.9%)	11.023s (~)	0.253s	3	1.00x
🐘 Postgres	Express	10.787s (-1.6%)	11.025s (~)	0.238s	3	1.00x
💻 Local	Next.js (Turbopack)	10.789s	11.024s	0.235s	3	1.00x
🐘 Postgres	Next.js (Turbopack)	10.879s	11.025s	0.146s	3	1.01x
💻 Local	Express	10.922s (~)	11.023s (~)	0.100s	3	1.01x
💻 Local	Nitro	10.955s (~)	11.024s (~)	0.069s	3	1.02x

workflow with 25 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	14.344s (-1.6%)	15.034s (~)	0.691s	4	1.00x
🐘 Postgres	Next.js (Turbopack)	14.467s	15.023s	0.556s	4	1.01x
💻 Local	Next.js (Turbopack)	14.720s	15.030s	0.310s	4	1.03x
🐘 Postgres	Nitro	14.789s (+1.3%)	15.529s (+3.3%)	0.740s	4	1.03x
💻 Local	Express	14.980s (~)	15.029s (~)	0.049s	4	1.04x
💻 Local	Nitro	15.104s (~)	16.033s (~)	0.929s	4	1.05x

workflow with 50 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	13.522s (-3.5%)	14.029s (-3.9%)	0.507s	7	1.00x
🐘 Postgres	Next.js (Turbopack)	13.921s	14.022s	0.101s	7	1.03x
🐘 Postgres	Nitro	14.610s (+4.6%)	15.355s (+7.3% 🔺)	0.745s	6	1.08x
💻 Local	Next.js (Turbopack)	16.229s	17.032s	0.803s	6	1.20x
💻 Local	Express	16.828s (+1.4%)	17.198s (+1.0%)	0.370s	6	1.24x
💻 Local	Nitro	16.921s (+0.8%)	17.032s (~)	0.111s	6	1.25x

Promise.all with 10 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	1.203s (-5.6% 🟢)	2.010s (~)	0.807s	15	1.00x
🐘 Postgres	Next.js (Turbopack)	1.233s	2.010s	0.777s	15	1.03x
🐘 Postgres	Express	1.234s (-2.1%)	2.011s (~)	0.777s	15	1.03x
💻 Local	Next.js (Turbopack)	1.509s	2.006s	0.497s	15	1.25x
💻 Local	Express	1.526s (+2.5%)	2.006s (~)	0.480s	15	1.27x
💻 Local	Nitro	1.561s (-4.3%)	2.006s (-3.3%)	0.445s	15	1.30x

Promise.all with 25 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	2.304s (-2.0%)	3.026s (+0.6%)	0.722s	10	1.00x
🐘 Postgres	Express	2.376s (+0.6%)	3.011s (~)	0.635s	10	1.03x
🐘 Postgres	Next.js (Turbopack)	2.406s	3.009s	0.603s	10	1.04x
💻 Local	Next.js (Turbopack)	2.809s	3.454s	0.645s	9	1.22x
💻 Local	Nitro	3.045s (-3.1%)	3.453s (-11.1% 🟢)	0.407s	9	1.32x
💻 Local	Express	3.066s (+3.8%)	3.885s (+12.5% 🔺)	0.819s	8	1.33x

Promise.all with 50 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	3.494s (~)	4.014s (~)	0.520s	8	1.00x
🐘 Postgres	Nitro	3.496s (~)	4.026s (~)	0.530s	8	1.00x
🐘 Postgres	Next.js (Turbopack)	3.682s	4.011s	0.329s	8	1.05x
💻 Local	Next.js (Turbopack)	7.885s	8.519s	0.634s	4	2.26x
💻 Local	Express	8.294s (-0.5%)	9.022s (~)	0.728s	4	2.37x
💻 Local	Nitro	9.038s (+8.2% 🔺)	9.522s (+5.6% 🔺)	0.485s	4	2.59x

Promise.race with 10 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	1.206s (-4.0%)	2.007s (~)	0.801s	15	1.00x
🐘 Postgres	Next.js (Turbopack)	1.239s	2.010s	0.771s	15	1.03x
🐘 Postgres	Express	1.247s (-0.8%)	2.010s (~)	0.763s	15	1.03x
💻 Local	Next.js (Turbopack)	1.520s	2.006s	0.486s	15	1.26x
💻 Local	Nitro	1.566s (-16.1% 🟢)	2.006s (-14.3% 🟢)	0.440s	15	1.30x
💻 Local	Express	1.678s (-11.4% 🟢)	2.222s (-6.0% 🟢)	0.544s	14	1.39x

Promise.race with 25 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	2.270s (-3.0%)	3.007s (~)	0.737s	10	1.00x
🐘 Postgres	Express	2.342s (~)	3.009s (~)	0.667s	10	1.03x
🐘 Postgres	Next.js (Turbopack)	2.402s	3.010s	0.608s	10	1.06x
💻 Local	Next.js (Turbopack)	2.983s	3.760s	0.776s	8	1.31x
💻 Local	Nitro	3.004s (-2.0%)	3.760s (-3.3%)	0.756s	8	1.32x
💻 Local	Express	3.144s (~)	4.010s (+6.6% 🔺)	0.866s	8	1.39x

Promise.race with 50 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	3.416s (-1.9%)	4.008s (~)	0.593s	8	1.00x
🐘 Postgres	Express	3.448s (-1.5%)	4.011s (~)	0.563s	8	1.01x
🐘 Postgres	Next.js (Turbopack)	3.649s	4.014s	0.365s	8	1.07x
💻 Local	Next.js (Turbopack)	8.305s	9.021s	0.716s	4	2.43x
💻 Local	Express	8.866s (+0.7%)	9.273s (~)	0.406s	4	2.60x
💻 Local	Nitro	9.213s (+0.8%)	9.772s (-2.5%)	0.559s	4	2.70x

workflow with 10 sequential data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	0.714s (-15.0% 🟢)	1.007s (-1.6%)	0.293s	60	1.00x
🐘 Postgres	Next.js (Turbopack)	0.781s	1.006s	0.226s	60	1.09x
💻 Local	Next.js (Turbopack)	0.890s	1.039s	0.149s	58	1.25x
🐘 Postgres	Nitro	0.982s (+19.7% 🔺)	1.346s (+33.7% 🔺)	0.363s	45	1.38x
💻 Local	Nitro	1.014s (+3.4%)	1.720s (+57.2% 🔺)	0.706s	35	1.42x
💻 Local	Express	1.128s (+14.6% 🔺)	1.570s (+45.9% 🔺)	0.442s	39	1.58x

workflow with 25 sequential data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	1.698s (-14.1% 🟢)	2.009s (-11.0% 🟢)	0.311s	45	1.00x
🐘 Postgres	Nitro	1.728s (-10.3% 🟢)	2.100s (~)	0.372s	43	1.02x
🐘 Postgres	Next.js (Turbopack)	1.932s	2.173s	0.241s	42	1.14x
💻 Local	Next.js (Turbopack)	2.943s	3.223s	0.280s	28	1.73x
💻 Local	Express	3.035s (+0.6%)	3.586s (~)	0.550s	26	1.79x
💻 Local	Nitro	3.041s (~)	3.843s (+2.3%)	0.803s	24	1.79x

workflow with 50 sequential data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	3.431s (-16.4% 🟢)	4.108s (-10.8% 🟢)	0.678s	30	1.00x
🐘 Postgres	Express	3.498s (-12.3% 🟢)	4.012s (-8.2% 🟢)	0.514s	30	1.02x
🐘 Postgres	Next.js (Turbopack)	3.864s	4.045s	0.181s	30	1.13x
💻 Local	Next.js (Turbopack)	8.870s	9.161s	0.291s	14	2.59x
💻 Local	Nitro	9.175s (-1.3%)	9.787s (-2.3%)	0.613s	13	2.67x
💻 Local	Express	9.295s (+0.9%)	9.941s (-0.8%)	0.646s	13	2.71x

workflow with 10 concurrent data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	0.244s (-13.9% 🟢)	1.007s (~)	0.764s	60	1.00x
🐘 Postgres	Next.js (Turbopack)	0.248s	1.007s	0.759s	60	1.02x
🐘 Postgres	Express	0.261s (-7.6% 🟢)	1.008s (~)	0.747s	60	1.07x
💻 Local	Express	0.595s (+6.1% 🔺)	1.005s (~)	0.410s	60	2.44x
💻 Local	Nitro	0.599s (-1.0%)	1.005s (-1.6%)	0.406s	60	2.46x
💻 Local	Next.js (Turbopack)	0.607s	1.022s	0.415s	59	2.49x

workflow with 25 concurrent data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	0.409s (-19.7% 🟢)	1.007s (~)	0.598s	90	1.00x
🐘 Postgres	Nitro	0.426s (-14.1% 🟢)	1.009s (~)	0.583s	90	1.04x
🐘 Postgres	Next.js (Turbopack)	0.504s	1.007s	0.503s	90	1.23x
💻 Local	Nitro	2.548s (~)	3.009s (~)	0.461s	30	6.23x
💻 Local	Next.js (Turbopack)	2.681s	3.009s	0.328s	30	6.55x
💻 Local	Express	2.844s (+13.1% 🔺)	3.472s (+15.4% 🔺)	0.629s	26	6.95x

workflow with 50 concurrent data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	0.654s (-20.1% 🟢)	1.016s (~)	0.362s	119	1.00x
🐘 Postgres	Nitro	0.657s (-16.8% 🟢)	1.054s (+4.7%)	0.397s	114	1.01x
🐘 Postgres	Next.js (Turbopack)	0.820s	1.016s	0.196s	119	1.25x
💻 Local	Nitro	11.257s (+0.6%)	11.938s (+2.3%)	0.681s	11	17.21x
💻 Local	Next.js (Turbopack)	11.270s	11.847s	0.577s	11	17.23x
💻 Local	Express	12.606s (+12.7% 🔺)	13.033s (+9.1% 🔺)	0.426s	10	19.28x

Stream Benchmarks(includes TTFB metrics)

workflow with stream

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Next.js (Turbopack)	0.180s	1.002s	0.013s	1.019s	0.839s	10	1.00x
🐘 Postgres	Next.js (Turbopack)	0.198s	1.000s	0.001s	1.010s	0.812s	10	1.10x
💻 Local	Express	0.201s (+0.8%)	1.005s (~)	0.012s (-0.8%)	1.018s (~)	0.818s	10	1.12x
💻 Local	Nitro	0.209s (-2.2%)	1.004s (~)	0.013s (+3.2%)	1.019s (~)	0.810s	10	1.16x
🐘 Postgres	Express	0.255s (+24.3% 🔺)	1.000s (~)	0.045s (+2712.5% 🔺)	1.056s (+4.4%)	0.801s	10	1.42x
🐘 Postgres	Nitro	0.330s (+60.9% 🔺)	1.008s (+0.8%)	0.124s (+8166.7% 🔺)	1.159s (+14.6% 🔺)	0.829s	10	1.84x

stream pipeline with 5 transform steps (1MB)

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	0.585s (-6.3% 🟢)	1.040s (+3.3%)	0.032s (+667.7% 🔺)	1.083s (+5.9% 🔺)	0.499s	56	1.00x
🐘 Postgres	Express	0.600s (-4.7%)	1.008s (~)	0.005s (+32.7% 🔺)	1.025s (~)	0.425s	59	1.03x
🐘 Postgres	Next.js (Turbopack)	0.650s	1.026s	0.007s	1.042s	0.392s	58	1.11x
💻 Local	Next.js (Turbopack)	0.680s	1.011s	0.009s	1.023s	0.343s	59	1.16x
💻 Local	Express	0.825s (+8.9% 🔺)	1.013s (-1.5%)	0.015s (+59.3% 🔺)	1.030s (-0.9%)	0.206s	59	1.41x
💻 Local	Nitro	0.847s (+0.9%)	1.012s (~)	0.010s (+4.2%)	1.116s (~)	0.269s	54	1.45x

10 parallel streams (1MB each)

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Next.js (Turbopack)	0.965s	1.250s	0.000s	1.264s	0.299s	48	1.00x
🐘 Postgres	Express	1.015s (+5.6% 🔺)	1.463s (+14.5% 🔺)	0.000s (-43.9% 🟢)	1.478s (+13.1% 🔺)	0.463s	41	1.05x
🐘 Postgres	Nitro	1.144s (+18.1% 🔺)	1.461s (+17.1% 🔺)	0.000s (-41.5% 🟢)	1.481s (+17.7% 🔺)	0.336s	41	1.19x
💻 Local	Nitro	1.252s (+2.4%)	2.022s (~)	0.000s (+266.7% 🔺)	2.024s (~)	0.772s	30	1.30x
💻 Local	Next.js (Turbopack)	1.309s	2.020s	0.000s	2.023s	0.714s	30	1.36x
💻 Local	Express	1.374s (+12.2% 🔺)	2.022s (~)	0.001s (+60.0% 🔺)	2.025s (~)	0.651s	30	1.42x

fan-out fan-in 10 streams (1MB each)

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	1.888s (+6.5% 🔺)	2.312s (+6.2% 🔺)	0.000s (NaN%)	2.331s (+6.0% 🔺)	0.443s	26	1.00x
🐘 Postgres	Next.js (Turbopack)	1.890s	2.146s	0.000s	2.153s	0.264s	28	1.00x
🐘 Postgres	Nitro	1.917s (+7.0% 🔺)	2.465s (+15.1% 🔺)	0.000s (-100.0% 🟢)	2.532s (+16.4% 🔺)	0.615s	25	1.02x
💻 Local	Next.js (Turbopack)	3.662s	4.032s	0.001s	4.038s	0.376s	15	1.94x
💻 Local	Nitro	3.709s (+9.5% 🔺)	4.234s (+5.0% 🔺)	0.000s (-25.0% 🟢)	4.236s (+5.0%)	0.528s	15	1.96x
💻 Local	Express	4.304s (+24.1% 🔺)	4.423s (+9.7% 🔺)	0.000s (-42.3% 🟢)	4.812s (+19.2% 🔺)	0.507s	13	2.28x

Summary

Fastest Framework by World

Winner determined by most benchmark wins

World	🥇 Fastest Framework	Wins
💻 Local	Next.js (Turbopack)	16/21
🐘 Postgres	Nitro	11/21

Fastest World by Framework

Winner determined by most benchmark wins

Framework	🥇 Fastest World	Wins
Express	🐘 Postgres	18/21
Next.js (Turbopack)	🐘 Postgres	17/21
Nitro	🐘 Postgres	19/21

Column Definitions

• Workflow Time: Runtime reported by workflow (completedAt - createdAt) - primary metric
• TTFB: Time to First Byte - time from workflow start until first stream byte received (stream benchmarks only)
• Slurp: Time from first byte to complete stream consumption (stream benchmarks only)
• Wall Time: Total testbench time (trigger workflow + poll for result)
• Overhead: Testbench overhead (Wall Time - Workflow Time)
• Samples: Number of benchmark iterations run
• vs Fastest: How much slower compared to the fastest configuration for this benchmark

Worlds:

• 💻 Local: In-memory filesystem world (local development)
• 🐘 Postgres: PostgreSQL database world (local development)
• ▲ Vercel: Vercel production/preview deployment
• 🌐 Turso: Community world (local development)
• 🌐 MongoDB: Community world (local development)
• 🌐 Redis: Community world (local development)
• 🌐 Jazz: Community world (local development)

---

📋 View full workflow run

[Copilot]

Pull request overview

Adjusts the e2e “step error preserves stack trace” assertions for Vite local dev after the Vite upgrade started preserving step bundle source maps in dev mode.

Changes:

• Update hasStepSourceMaps() to allow Vite local dev to assert original source filenames in stacks (while keeping local prod behavior unchanged).
• Add an (empty) changeset note documenting the Vite local-dev e2e fix.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
packages/core/e2e/utils.ts	Refines step sourcemap support matrix so Vite local dev no longer disables stack source assertions.
.changeset/fix-vite-step-source-maps-e2e.md	Documents the reason for the Vite local-dev e2e assertion change.

---

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[TooTallNate]

Summary

• Vite local-dev e2e tests basic step error preserves message and stack trace and cross-file step error preserves message and function names in stack have been failing consistently since #1827 bumped workbench/vite from vite@^7.1.12 to vite@^7.3.2.
• The newer vite preserves step bundle source maps in dev mode, so stack traces now point at original files (99_e2e.ts, helpers.ts). However, hasStepSourceMaps() in packages/core/e2e/utils.ts still hard-codes vite as having no step source maps in any local environment, so the assertion expect(stack).not.toContain('99_e2e.ts') fails.
• Fix: drop the vite-specific block in hasStepSourceMaps() entirely. Vite local dev now falls through to the default return true, while vite local prod is still caught by the existing !DEV_TEST_CONFIG guard further down — so local-prod behavior is unchanged.

Why this took 6 days to surface

1. The push for [workflow] Bump Vite #1827 had Local Dev tests skipped due to matrix selection at the time.
2. The next push (Lock next@canary test version #1860) introduced a CI env-var bug that prevented Local Dev tests from running at all.
3. ci: fix VERCEL_WORKFLOW_SERVER_* env var ternary on main #1859 (28dc089e) fixed the env-var bug, finally letting vite local dev run — and it surfaced this assertion failure.

Reference failing run: https://github.com/vercel/workflow/actions/runs/25067758534/job/73444472541

[vercel]

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[changeset-bot]

🦋 Changeset detected

Latest commit: 072a4d0

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

This PR includes changesets to release 0 packages

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

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Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions]

🧪 E2E Test Results

✅ All tests passed

Summary

	Passed	Failed	Skipped	Total
✅ ▲ Vercel Production	978	0	67	1045
✅ 💻 Local Development	1054	0	86	1140
✅ 📦 Local Production	1054	0	86	1140
✅ 🐘 Local Postgres	1054	0	86	1140
✅ 🪟 Windows	95	0	0	95
✅ 📋 Other	267	0	18	285
Total	4502	0	343	4845

Details by Category

✅ ▲ Vercel Production

App	Passed	Failed	Skipped
✅ astro	88	0	7
✅ example	88	0	7
✅ express	88	0	7
✅ fastify	88	0	7
✅ hono	88	0	7
✅ nextjs-turbopack	93	0	2
✅ nextjs-webpack	93	0	2
✅ nitro	88	0	7
✅ nuxt	88	0	7
✅ sveltekit	88	0	7
✅ vite	88	0	7

✅ 💻 Local Development

App	Passed	Failed	Skipped
✅ astro-stable	89	0	6
✅ express-stable	89	0	6
✅ fastify-stable	89	0	6
✅ hono-stable	89	0	6
✅ nextjs-turbopack-canary	76	0	19
✅ nextjs-turbopack-stable	95	0	0
✅ nextjs-webpack-canary	76	0	19
✅ nextjs-webpack-stable	95	0	0
✅ nitro-stable	89	0	6
✅ nuxt-stable	89	0	6
✅ sveltekit-stable	89	0	6
✅ vite-stable	89	0	6

✅ 📦 Local Production

App	Passed	Failed	Skipped
✅ astro-stable	89	0	6
✅ express-stable	89	0	6
✅ fastify-stable	89	0	6
✅ hono-stable	89	0	6
✅ nextjs-turbopack-canary	76	0	19
✅ nextjs-turbopack-stable	95	0	0
✅ nextjs-webpack-canary	76	0	19
✅ nextjs-webpack-stable	95	0	0
✅ nitro-stable	89	0	6
✅ nuxt-stable	89	0	6
✅ sveltekit-stable	89	0	6
✅ vite-stable	89	0	6

✅ 🐘 Local Postgres

App	Passed	Failed	Skipped
✅ astro-stable	89	0	6
✅ express-stable	89	0	6
✅ fastify-stable	89	0	6
✅ hono-stable	89	0	6
✅ nextjs-turbopack-canary	76	0	19
✅ nextjs-turbopack-stable	95	0	0
✅ nextjs-webpack-canary	76	0	19
✅ nextjs-webpack-stable	95	0	0
✅ nitro-stable	89	0	6
✅ nuxt-stable	89	0	6
✅ sveltekit-stable	89	0	6
✅ vite-stable	89	0	6

✅ 🪟 Windows

App	Passed	Failed	Skipped
✅ nextjs-turbopack	95	0	0

✅ 📋 Other

App	Passed	Failed	Skipped
✅ e2e-local-dev-nest-stable	89	0	6
✅ e2e-local-postgres-nest-stable	89	0	6
✅ e2e-local-prod-nest-stable	89	0	6

---

📋 View full workflow run

[github-actions]

📊 Benchmark Results

📈 Comparing against baseline from main branch. Green 🟢 = faster, Red 🔺 = slower.

workflow with no steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Express	0.040s (-9.3% 🟢)	1.005s (~)	0.965s	10	1.00x
💻 Local	Nitro	0.046s (+6.7% 🔺)	1.005s (~)	0.959s	10	1.14x
🐘 Postgres	Nitro	0.049s (-48.3% 🟢)	1.011s (-3.1%)	0.961s	10	1.22x
💻 Local	Next.js (Turbopack)	0.051s	1.005s	0.954s	10	1.27x
🐘 Postgres	Express	0.053s (-8.4% 🟢)	1.012s (~)	0.959s	10	1.32x
🐘 Postgres	Next.js (Turbopack)	0.057s	1.009s	0.952s	10	1.42x

workflow with 1 step

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Next.js (Turbopack)	1.120s	2.005s	0.886s	10	1.00x
💻 Local	Express	1.127s (~)	2.005s (~)	0.878s	10	1.01x
🐘 Postgres	Nitro	1.128s (-1.1%)	2.008s (~)	0.880s	10	1.01x
💻 Local	Nitro	1.137s (+0.5%)	2.006s (~)	0.869s	10	1.02x
🐘 Postgres	Express	1.144s (~)	2.010s (~)	0.867s	10	1.02x
🐘 Postgres	Next.js (Turbopack)	1.150s	2.012s	0.862s	10	1.03x

workflow with 10 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	10.770s (-0.9%)	11.023s (~)	0.253s	3	1.00x
🐘 Postgres	Express	10.787s (-1.6%)	11.025s (~)	0.238s	3	1.00x
💻 Local	Next.js (Turbopack)	10.789s	11.024s	0.235s	3	1.00x
🐘 Postgres	Next.js (Turbopack)	10.879s	11.025s	0.146s	3	1.01x
💻 Local	Express	10.922s (~)	11.023s (~)	0.100s	3	1.01x
💻 Local	Nitro	10.955s (~)	11.024s (~)	0.069s	3	1.02x

workflow with 25 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	14.344s (-1.6%)	15.034s (~)	0.691s	4	1.00x
🐘 Postgres	Next.js (Turbopack)	14.467s	15.023s	0.556s	4	1.01x
💻 Local	Next.js (Turbopack)	14.720s	15.030s	0.310s	4	1.03x
🐘 Postgres	Nitro	14.789s (+1.3%)	15.529s (+3.3%)	0.740s	4	1.03x
💻 Local	Express	14.980s (~)	15.029s (~)	0.049s	4	1.04x
💻 Local	Nitro	15.104s (~)	16.033s (~)	0.929s	4	1.05x

workflow with 50 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	13.522s (-3.5%)	14.029s (-3.9%)	0.507s	7	1.00x
🐘 Postgres	Next.js (Turbopack)	13.921s	14.022s	0.101s	7	1.03x
🐘 Postgres	Nitro	14.610s (+4.6%)	15.355s (+7.3% 🔺)	0.745s	6	1.08x
💻 Local	Next.js (Turbopack)	16.229s	17.032s	0.803s	6	1.20x
💻 Local	Express	16.828s (+1.4%)	17.198s (+1.0%)	0.370s	6	1.24x
💻 Local	Nitro	16.921s (+0.8%)	17.032s (~)	0.111s	6	1.25x

Promise.all with 10 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	1.203s (-5.6% 🟢)	2.010s (~)	0.807s	15	1.00x
🐘 Postgres	Next.js (Turbopack)	1.233s	2.010s	0.777s	15	1.03x
🐘 Postgres	Express	1.234s (-2.1%)	2.011s (~)	0.777s	15	1.03x
💻 Local	Next.js (Turbopack)	1.509s	2.006s	0.497s	15	1.25x
💻 Local	Express	1.526s (+2.5%)	2.006s (~)	0.480s	15	1.27x
💻 Local	Nitro	1.561s (-4.3%)	2.006s (-3.3%)	0.445s	15	1.30x

Promise.all with 25 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	2.304s (-2.0%)	3.026s (+0.6%)	0.722s	10	1.00x
🐘 Postgres	Express	2.376s (+0.6%)	3.011s (~)	0.635s	10	1.03x
🐘 Postgres	Next.js (Turbopack)	2.406s	3.009s	0.603s	10	1.04x
💻 Local	Next.js (Turbopack)	2.809s	3.454s	0.645s	9	1.22x
💻 Local	Nitro	3.045s (-3.1%)	3.453s (-11.1% 🟢)	0.407s	9	1.32x
💻 Local	Express	3.066s (+3.8%)	3.885s (+12.5% 🔺)	0.819s	8	1.33x

Promise.all with 50 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	3.494s (~)	4.014s (~)	0.520s	8	1.00x
🐘 Postgres	Nitro	3.496s (~)	4.026s (~)	0.530s	8	1.00x
🐘 Postgres	Next.js (Turbopack)	3.682s	4.011s	0.329s	8	1.05x
💻 Local	Next.js (Turbopack)	7.885s	8.519s	0.634s	4	2.26x
💻 Local	Express	8.294s (-0.5%)	9.022s (~)	0.728s	4	2.37x
💻 Local	Nitro	9.038s (+8.2% 🔺)	9.522s (+5.6% 🔺)	0.485s	4	2.59x

Promise.race with 10 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	1.206s (-4.0%)	2.007s (~)	0.801s	15	1.00x
🐘 Postgres	Next.js (Turbopack)	1.239s	2.010s	0.771s	15	1.03x
🐘 Postgres	Express	1.247s (-0.8%)	2.010s (~)	0.763s	15	1.03x
💻 Local	Next.js (Turbopack)	1.520s	2.006s	0.486s	15	1.26x
💻 Local	Nitro	1.566s (-16.1% 🟢)	2.006s (-14.3% 🟢)	0.440s	15	1.30x
💻 Local	Express	1.678s (-11.4% 🟢)	2.222s (-6.0% 🟢)	0.544s	14	1.39x

Promise.race with 25 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	2.270s (-3.0%)	3.007s (~)	0.737s	10	1.00x
🐘 Postgres	Express	2.342s (~)	3.009s (~)	0.667s	10	1.03x
🐘 Postgres	Next.js (Turbopack)	2.402s	3.010s	0.608s	10	1.06x
💻 Local	Next.js (Turbopack)	2.983s	3.760s	0.776s	8	1.31x
💻 Local	Nitro	3.004s (-2.0%)	3.760s (-3.3%)	0.756s	8	1.32x
💻 Local	Express	3.144s (~)	4.010s (+6.6% 🔺)	0.866s	8	1.39x

Promise.race with 50 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	3.416s (-1.9%)	4.008s (~)	0.593s	8	1.00x
🐘 Postgres	Express	3.448s (-1.5%)	4.011s (~)	0.563s	8	1.01x
🐘 Postgres	Next.js (Turbopack)	3.649s	4.014s	0.365s	8	1.07x
💻 Local	Next.js (Turbopack)	8.305s	9.021s	0.716s	4	2.43x
💻 Local	Express	8.866s (+0.7%)	9.273s (~)	0.406s	4	2.60x
💻 Local	Nitro	9.213s (+0.8%)	9.772s (-2.5%)	0.559s	4	2.70x

workflow with 10 sequential data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	0.714s (-15.0% 🟢)	1.007s (-1.6%)	0.293s	60	1.00x
🐘 Postgres	Next.js (Turbopack)	0.781s	1.006s	0.226s	60	1.09x
💻 Local	Next.js (Turbopack)	0.890s	1.039s	0.149s	58	1.25x
🐘 Postgres	Nitro	0.982s (+19.7% 🔺)	1.346s (+33.7% 🔺)	0.363s	45	1.38x
💻 Local	Nitro	1.014s (+3.4%)	1.720s (+57.2% 🔺)	0.706s	35	1.42x
💻 Local	Express	1.128s (+14.6% 🔺)	1.570s (+45.9% 🔺)	0.442s	39	1.58x

workflow with 25 sequential data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	1.698s (-14.1% 🟢)	2.009s (-11.0% 🟢)	0.311s	45	1.00x
🐘 Postgres	Nitro	1.728s (-10.3% 🟢)	2.100s (~)	0.372s	43	1.02x
🐘 Postgres	Next.js (Turbopack)	1.932s	2.173s	0.241s	42	1.14x
💻 Local	Next.js (Turbopack)	2.943s	3.223s	0.280s	28	1.73x
💻 Local	Express	3.035s (+0.6%)	3.586s (~)	0.550s	26	1.79x
💻 Local	Nitro	3.041s (~)	3.843s (+2.3%)	0.803s	24	1.79x

workflow with 50 sequential data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	3.431s (-16.4% 🟢)	4.108s (-10.8% 🟢)	0.678s	30	1.00x
🐘 Postgres	Express	3.498s (-12.3% 🟢)	4.012s (-8.2% 🟢)	0.514s	30	1.02x
🐘 Postgres	Next.js (Turbopack)	3.864s	4.045s	0.181s	30	1.13x
💻 Local	Next.js (Turbopack)	8.870s	9.161s	0.291s	14	2.59x
💻 Local	Nitro	9.175s (-1.3%)	9.787s (-2.3%)	0.613s	13	2.67x
💻 Local	Express	9.295s (+0.9%)	9.941s (-0.8%)	0.646s	13	2.71x

workflow with 10 concurrent data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	0.244s (-13.9% 🟢)	1.007s (~)	0.764s	60	1.00x
🐘 Postgres	Next.js (Turbopack)	0.248s	1.007s	0.759s	60	1.02x
🐘 Postgres	Express	0.261s (-7.6% 🟢)	1.008s (~)	0.747s	60	1.07x
💻 Local	Express	0.595s (+6.1% 🔺)	1.005s (~)	0.410s	60	2.44x
💻 Local	Nitro	0.599s (-1.0%)	1.005s (-1.6%)	0.406s	60	2.46x
💻 Local	Next.js (Turbopack)	0.607s	1.022s	0.415s	59	2.49x

workflow with 25 concurrent data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	0.409s (-19.7% 🟢)	1.007s (~)	0.598s	90	1.00x
🐘 Postgres	Nitro	0.426s (-14.1% 🟢)	1.009s (~)	0.583s	90	1.04x
🐘 Postgres	Next.js (Turbopack)	0.504s	1.007s	0.503s	90	1.23x
💻 Local	Nitro	2.548s (~)	3.009s (~)	0.461s	30	6.23x
💻 Local	Next.js (Turbopack)	2.681s	3.009s	0.328s	30	6.55x
💻 Local	Express	2.844s (+13.1% 🔺)	3.472s (+15.4% 🔺)	0.629s	26	6.95x

workflow with 50 concurrent data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	0.654s (-20.1% 🟢)	1.016s (~)	0.362s	119	1.00x
🐘 Postgres	Nitro	0.657s (-16.8% 🟢)	1.054s (+4.7%)	0.397s	114	1.01x
🐘 Postgres	Next.js (Turbopack)	0.820s	1.016s	0.196s	119	1.25x
💻 Local	Nitro	11.257s (+0.6%)	11.938s (+2.3%)	0.681s	11	17.21x
💻 Local	Next.js (Turbopack)	11.270s	11.847s	0.577s	11	17.23x
💻 Local	Express	12.606s (+12.7% 🔺)	13.033s (+9.1% 🔺)	0.426s	10	19.28x

Stream Benchmarks(includes TTFB metrics)

workflow with stream

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Next.js (Turbopack)	0.180s	1.002s	0.013s	1.019s	0.839s	10	1.00x
🐘 Postgres	Next.js (Turbopack)	0.198s	1.000s	0.001s	1.010s	0.812s	10	1.10x
💻 Local	Express	0.201s (+0.8%)	1.005s (~)	0.012s (-0.8%)	1.018s (~)	0.818s	10	1.12x
💻 Local	Nitro	0.209s (-2.2%)	1.004s (~)	0.013s (+3.2%)	1.019s (~)	0.810s	10	1.16x
🐘 Postgres	Express	0.255s (+24.3% 🔺)	1.000s (~)	0.045s (+2712.5% 🔺)	1.056s (+4.4%)	0.801s	10	1.42x
🐘 Postgres	Nitro	0.330s (+60.9% 🔺)	1.008s (+0.8%)	0.124s (+8166.7% 🔺)	1.159s (+14.6% 🔺)	0.829s	10	1.84x

stream pipeline with 5 transform steps (1MB)

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	0.585s (-6.3% 🟢)	1.040s (+3.3%)	0.032s (+667.7% 🔺)	1.083s (+5.9% 🔺)	0.499s	56	1.00x
🐘 Postgres	Express	0.600s (-4.7%)	1.008s (~)	0.005s (+32.7% 🔺)	1.025s (~)	0.425s	59	1.03x
🐘 Postgres	Next.js (Turbopack)	0.650s	1.026s	0.007s	1.042s	0.392s	58	1.11x
💻 Local	Next.js (Turbopack)	0.680s	1.011s	0.009s	1.023s	0.343s	59	1.16x
💻 Local	Express	0.825s (+8.9% 🔺)	1.013s (-1.5%)	0.015s (+59.3% 🔺)	1.030s (-0.9%)	0.206s	59	1.41x
💻 Local	Nitro	0.847s (+0.9%)	1.012s (~)	0.010s (+4.2%)	1.116s (~)	0.269s	54	1.45x

10 parallel streams (1MB each)

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Next.js (Turbopack)	0.965s	1.250s	0.000s	1.264s	0.299s	48	1.00x
🐘 Postgres	Express	1.015s (+5.6% 🔺)	1.463s (+14.5% 🔺)	0.000s (-43.9% 🟢)	1.478s (+13.1% 🔺)	0.463s	41	1.05x
🐘 Postgres	Nitro	1.144s (+18.1% 🔺)	1.461s (+17.1% 🔺)	0.000s (-41.5% 🟢)	1.481s (+17.7% 🔺)	0.336s	41	1.19x
💻 Local	Nitro	1.252s (+2.4%)	2.022s (~)	0.000s (+266.7% 🔺)	2.024s (~)	0.772s	30	1.30x
💻 Local	Next.js (Turbopack)	1.309s	2.020s	0.000s	2.023s	0.714s	30	1.36x
💻 Local	Express	1.374s (+12.2% 🔺)	2.022s (~)	0.001s (+60.0% 🔺)	2.025s (~)	0.651s	30	1.42x

fan-out fan-in 10 streams (1MB each)

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	1.888s (+6.5% 🔺)	2.312s (+6.2% 🔺)	0.000s (NaN%)	2.331s (+6.0% 🔺)	0.443s	26	1.00x
🐘 Postgres	Next.js (Turbopack)	1.890s	2.146s	0.000s	2.153s	0.264s	28	1.00x
🐘 Postgres	Nitro	1.917s (+7.0% 🔺)	2.465s (+15.1% 🔺)	0.000s (-100.0% 🟢)	2.532s (+16.4% 🔺)	0.615s	25	1.02x
💻 Local	Next.js (Turbopack)	3.662s	4.032s	0.001s	4.038s	0.376s	15	1.94x
💻 Local	Nitro	3.709s (+9.5% 🔺)	4.234s (+5.0% 🔺)	0.000s (-25.0% 🟢)	4.236s (+5.0%)	0.528s	15	1.96x
💻 Local	Express	4.304s (+24.1% 🔺)	4.423s (+9.7% 🔺)	0.000s (-42.3% 🟢)	4.812s (+19.2% 🔺)	0.507s	13	2.28x

Summary

Fastest Framework by World

Winner determined by most benchmark wins

World	🥇 Fastest Framework	Wins
💻 Local	Next.js (Turbopack)	16/21
🐘 Postgres	Nitro	11/21

Fastest World by Framework

Winner determined by most benchmark wins

Framework	🥇 Fastest World	Wins
Express	🐘 Postgres	18/21
Next.js (Turbopack)	🐘 Postgres	17/21
Nitro	🐘 Postgres	19/21

Column Definitions

• Workflow Time: Runtime reported by workflow (completedAt - createdAt) - primary metric
• TTFB: Time to First Byte - time from workflow start until first stream byte received (stream benchmarks only)
• Slurp: Time from first byte to complete stream consumption (stream benchmarks only)
• Wall Time: Total testbench time (trigger workflow + poll for result)
• Overhead: Testbench overhead (Wall Time - Workflow Time)
• Samples: Number of benchmark iterations run
• vs Fastest: How much slower compared to the fastest configuration for this benchmark

Worlds:

• 💻 Local: In-memory filesystem world (local development)
• 🐘 Postgres: PostgreSQL database world (local development)
• ▲ Vercel: Vercel production/preview deployment
• 🌐 Turso: Community world (local development)
• 🌐 MongoDB: Community world (local development)
• 🌐 Redis: Community world (local development)
• 🌐 Jazz: Community world (local development)

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[Copilot]

Pull request overview

Adjusts the e2e “step error preserves stack trace” assertions for Vite local dev after the Vite upgrade started preserving step bundle source maps in dev mode.

Changes:

• Update hasStepSourceMaps() to allow Vite local dev to assert original source filenames in stacks (while keeping local prod behavior unchanged).
• Add an (empty) changeset note documenting the Vite local-dev e2e fix.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
packages/core/e2e/utils.ts	Refines step sourcemap support matrix so Vite local dev no longer disables stack source assertions.
.changeset/fix-vite-step-source-maps-e2e.md	Documents the reason for the Vite local-dev e2e assertion change.

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