fix(builders) - support explicit project roots in swc transforms by AndrewBarba · Pull Request #1399 · vercel/workflow

AndrewBarba · 2026-03-16T16:49:31Z

Summary

add an optional projectRoot to builder config so SWC/module-specifier resolution does not have to rely on global cwd
thread that root through discovery, SWC transforms, and the Next deferred builder while preserving existing defaults
add focused builders tests that prove workspace package ids can be resolved from a consuming app root

Why

[secret framework] currently has to temporarily mutate process.cwd() when invoking Workflow builders so package-owned workflows resolve to stable package ids from the app root. This change makes that root explicit and keeps the current behavior as the fallback when projectRoot is omitted.

Validation

pnpm exec vitest run packages/builders/src/module-specifier.test.ts packages/builders/src/swc-esbuild-plugin.test.ts packages/builders/src/discover-entries-esbuild-plugin.test.ts
pnpm --filter @workflow/builders typecheck
pnpm --filter @workflow/builders build
pnpm --filter @workflow/next build

changeset-bot · 2026-03-16T16:49:36Z

⚠️ No Changeset found

Latest commit: 961ab1b

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vercel · 2026-03-16T16:49:39Z

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

Project	Deployment	Actions	Updated (UTC)
example-nextjs-workflow-turbopack	Ready	Preview, Comment, Open in v0	Mar 20, 2026 0:57am
example-nextjs-workflow-webpack	Ready	Preview, Comment, Open in v0	Mar 20, 2026 0:57am
example-workflow	Ready	Preview, Comment, Open in v0	Mar 20, 2026 0:57am
workbench-astro-workflow	Ready	Preview, Comment, Open in v0	Mar 20, 2026 0:57am
workbench-express-workflow	Ready	Preview, Comment, Open in v0	Mar 20, 2026 0:57am
workbench-fastify-workflow	Ready	Preview, Comment, Open in v0	Mar 20, 2026 0:57am
workbench-hono-workflow	Ready	Preview, Comment, Open in v0	Mar 20, 2026 0:57am
workbench-nitro-workflow	Ready	Preview, Comment, Open in v0	Mar 20, 2026 0:57am
workbench-nuxt-workflow	Ready	Preview, Comment, Open in v0	Mar 20, 2026 0:57am
workbench-sveltekit-workflow	Ready	Preview, Comment, Open in v0	Mar 20, 2026 0:57am
workbench-vite-workflow	Ready	Preview, Comment, Open in v0	Mar 20, 2026 0:57am
workflow-docs	Ready	Preview, Comment, Open in v0	Mar 20, 2026 0:57am
workflow-nest	Ready	Preview, Comment, Open in v0	Mar 20, 2026 0:57am
workflow-swc-playground	Ready	Preview, Comment, Open in v0	Mar 20, 2026 0:57am

github-actions · 2026-03-16T16:49:41Z

🧪 E2E Test Results

❌ Some tests failed

Summary

	Passed	Failed	Skipped	Total
✅ ▲ Vercel Production	758	0	67	825
✅ 💻 Local Development	782	0	118	900
✅ 📦 Local Production	782	0	118	900
✅ 🐘 Local Postgres	782	0	118	900
✅ 🪟 Windows	72	0	3	75
❌ 🌍 Community Worlds	118	56	15	189
✅ 📋 Other	198	0	27	225
Total	3492	56	466	4014

❌ Failed Tests

🌍 Community Worlds (56 failed)

mongodb (3 failed):

hookWorkflow is not resumable via public webhook endpoint | wrun_01KM4BZSJE52H0EYCFZZY4VSW7
webhookWorkflow | wrun_01KM4C01227QX4JVHQ83V2VZ11
concurrent hook token conflict - two workflows cannot use the same hook token simultaneously | wrun_01KM4C5ED7K640GEK1RQBFBJ28

redis (2 failed):

hookWorkflow is not resumable via public webhook endpoint | wrun_01KM4BZSJE52H0EYCFZZY4VSW7
concurrent hook token conflict - two workflows cannot use the same hook token simultaneously | wrun_01KM4C5ED7K640GEK1RQBFBJ28

turso (51 failed):

addTenWorkflow | wrun_01KM4BYFW57CFEW8GR7058Y8YK
addTenWorkflow | wrun_01KM4BYFW57CFEW8GR7058Y8YK
wellKnownAgentWorkflow (.well-known/agent) | wrun_01KM4C04F6ST94SKYNP17MMNX8
should work with react rendering in step
promiseAllWorkflow | wrun_01KM4BYQV4WVMGFYHWWT2N8775
promiseRaceWorkflow | wrun_01KM4BYWDG2SYBMSKTTY2HQDSF
promiseAnyWorkflow | wrun_01KM4BYYJQMAHQ5KKR1V30PRVG
importedStepOnlyWorkflow | wrun_01KM4C0FKZ7W7WN5RB075XY6JC
hookWorkflow | wrun_01KM4BZDJAN8AYF7HC72YV5VS8
hookWorkflow is not resumable via public webhook endpoint | wrun_01KM4BZSJE52H0EYCFZZY4VSW7
webhookWorkflow | wrun_01KM4C01227QX4JVHQ83V2VZ11
sleepingWorkflow | wrun_01KM4C07GVPPA96WB4HYJP7Y1N
parallelSleepWorkflow | wrun_01KM4C0MFK08DYN8HMEQ14KVZJ
nullByteWorkflow | wrun_01KM4C0RZCQV4VHYWPS3JM4JMB
workflowAndStepMetadataWorkflow | wrun_01KM4C0V3R905B3DPK2TAFCNJ6
fetchWorkflow | wrun_01KM4C1QESMNQJT4XF9ZT4J99N
promiseRaceStressTestWorkflow | wrun_01KM4C1VRTVGTTEDTGNFKR0NMR
error handling error propagation workflow errors nested function calls preserve message and stack trace
error handling error propagation workflow errors cross-file imports preserve message and stack trace
error handling error propagation step errors basic step error preserves message and stack trace
error handling error propagation step errors cross-file step error preserves message and function names in stack
error handling retry behavior regular Error retries until success
error handling retry behavior FatalError fails immediately without retries
error handling retry behavior RetryableError respects custom retryAfter delay
error handling retry behavior maxRetries=0 disables retries
error handling catchability FatalError can be caught and detected with FatalError.is()
hookCleanupTestWorkflow - hook token reuse after workflow completion | wrun_01KM4C4V60Q99Q74P2C2PCTD9X
concurrent hook token conflict - two workflows cannot use the same hook token simultaneously | wrun_01KM4C5ED7K640GEK1RQBFBJ28
hookDisposeTestWorkflow - hook token reuse after explicit disposal while workflow still running | wrun_01KM4C63C2PF4JAQKHFAZQBXRZ
stepFunctionPassingWorkflow - step function references can be passed as arguments (without closure vars) | wrun_01KM4C6Q3HVWYHN7H3497D2C4X
stepFunctionWithClosureWorkflow - step function with closure variables passed as argument | wrun_01KM4C70AGVE6R6X3SNPH40D42
closureVariableWorkflow - nested step functions with closure variables | wrun_01KM4C76A3094QBQGFHV77WYS8
spawnWorkflowFromStepWorkflow - spawning a child workflow using start() inside a step | wrun_01KM4C7BD1D977NJE4PSEFDP43
health check (queue-based) - workflow and step endpoints respond to health check messages
pathsAliasWorkflow - TypeScript path aliases resolve correctly | wrun_01KM4C7V3M58YZ7MP8FGJ31CCR
Calculator.calculate - static workflow method using static step methods from another class | wrun_01KM4C81K6VPBVTEFGEZPKFEGQ
AllInOneService.processNumber - static workflow method using sibling static step methods | wrun_01KM4C889A40D6KRP6JCT2Z14E
ChainableService.processWithThis - static step methods using this to reference the class | wrun_01KM4C8DRVYK5WNHNGEE2X2TWP
thisSerializationWorkflow - step function invoked with .call() and .apply() | wrun_01KM4C8MK3QFY10ANYFB4Z7ZW0
customSerializationWorkflow - custom class serialization with WORKFLOW_SERIALIZE/WORKFLOW_DESERIALIZE | wrun_01KM4C8VD64VV24JNMMEY9N4GG
instanceMethodStepWorkflow - instance methods with "use step" directive | wrun_01KM4C92426F8TS05TVFV82XY8
crossContextSerdeWorkflow - classes defined in step code are deserializable in workflow context | wrun_01KM4C9DARF3DDFVP0APB8WM7E
stepFunctionAsStartArgWorkflow - step function reference passed as start() argument | wrun_01KM4C9N80CT63JQ0CP78A1H1N
cancelRun - cancelling a running workflow | wrun_01KM4C9VYJHV9CYHQ36FVYSZEZ
cancelRun via CLI - cancelling a running workflow | wrun_01KM4CA5VHG5J92ZSBR8MHTDDC
pages router addTenWorkflow via pages router
pages router promiseAllWorkflow via pages router
pages router sleepingWorkflow via pages router
hookWithSleepWorkflow - hook payloads delivered correctly with concurrent sleep | wrun_01KM4CAKF5TGW3Z18CJ4VQ1E8R
sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration | wrun_01KM4CB8ABW93GQZ5K05SV41AV
sleepWithSequentialStepsWorkflow - sequential steps work with concurrent sleep (control) | wrun_01KM4CBJ38FRE0EWA1MQK8E3PY

Details by Category

✅ ▲ Vercel Production

App	Passed	Skipped
✅ astro	68	7
✅ example	68	7
✅ express	68	7
✅ fastify	68	7
✅ hono	68	7
✅ nextjs-turbopack	73	2
✅ nextjs-webpack	73	2
✅ nitro	68	7
✅ nuxt	68	7
✅ sveltekit	68	7
✅ vite	68	7

✅ 💻 Local Development

App	Passed	Skipped
✅ astro-stable	66	9
✅ express-stable	66	9
✅ fastify-stable	66	9
✅ hono-stable	66	9
✅ nextjs-turbopack-canary	55	20
✅ nextjs-turbopack-stable	72	3
✅ nextjs-webpack-canary	55	20
✅ nextjs-webpack-stable	72	3
✅ nitro-stable	66	9
✅ nuxt-stable	66	9
✅ sveltekit-stable	66	9
✅ vite-stable	66	9

✅ 📦 Local Production

App	Passed	Skipped
✅ astro-stable	66	9
✅ express-stable	66	9
✅ fastify-stable	66	9
✅ hono-stable	66	9
✅ nextjs-turbopack-canary	55	20
✅ nextjs-turbopack-stable	72	3
✅ nextjs-webpack-canary	55	20
✅ nextjs-webpack-stable	72	3
✅ nitro-stable	66	9
✅ nuxt-stable	66	9
✅ sveltekit-stable	66	9
✅ vite-stable	66	9

✅ 🐘 Local Postgres

App	Passed	Skipped
✅ astro-stable	66	9
✅ express-stable	66	9
✅ fastify-stable	66	9
✅ hono-stable	66	9
✅ nextjs-turbopack-canary	55	20
✅ nextjs-turbopack-stable	72	3
✅ nextjs-webpack-canary	55	20
✅ nextjs-webpack-stable	72	3
✅ nitro-stable	66	9
✅ nuxt-stable	66	9
✅ sveltekit-stable	66	9
✅ vite-stable	66	9

✅ 🪟 Windows

App	Passed	Failed	Skipped
✅ nextjs-turbopack	72	0	3

❌ 🌍 Community Worlds

App	Passed	Failed	Skipped
✅ mongodb-dev	3	0	2
❌ mongodb	52	3	3
✅ redis-dev	3	0	2
❌ redis	53	2	3
✅ turso-dev	3	0	2
❌ turso	4	51	3

✅ 📋 Other

App	Passed	Skipped
✅ e2e-local-dev-nest-stable	66	9
✅ e2e-local-postgres-nest-stable	66	9
✅ e2e-local-prod-nest-stable	66	9

📋 View full workflow run

github-actions · 2026-03-16T16:49:44Z

📊 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	0.042s (-13.5% 🟢)	1.006s (~)	0.964s	10	1.00x
💻 Local	Nitro	0.043s (+11.9% 🔺)	1.005s (~)	0.962s	10	1.04x
💻 Local	Next.js (Turbopack)	0.049s	1.005s	0.957s	10	1.17x
🌐 Redis	Next.js (Turbopack)	0.054s	1.005s	0.952s	10	1.29x
🐘 Postgres	Express	0.061s (-23.8% 🟢)	1.012s (~)	0.951s	10	1.47x
🐘 Postgres	Next.js (Turbopack)	0.061s	1.011s	0.950s	10	1.47x
🐘 Postgres	Nitro	0.066s (-4.8%)	1.014s (-0.6%)	0.948s	10	1.59x
🌐 MongoDB	Next.js (Turbopack)	0.101s	1.008s	0.907s	10	2.44x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	0.450s (-13.3% 🟢)	2.188s (-9.8% 🟢)	1.737s	10	1.00x
▲ Vercel	Nitro	0.472s (-8.7% 🟢)	2.318s (-5.9% 🟢)	1.846s	10	1.05x
▲ Vercel	Next.js (Turbopack)	⚠️ missing	-	-	-	-

🔍 Observability: Express | Nitro

workflow with 1 step

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Next.js (Turbopack)	1.121s	2.006s	0.885s	10	1.00x
🌐 Redis	Next.js (Turbopack)	1.124s	2.007s	0.883s	10	1.00x
💻 Local	Nitro	1.125s (+3.0%)	2.006s (~)	0.881s	10	1.00x
💻 Local	Express	1.130s (~)	2.005s (~)	0.875s	10	1.01x
🐘 Postgres	Next.js (Turbopack)	1.139s	2.012s	0.873s	10	1.02x
🐘 Postgres	Express	1.148s (~)	2.013s (~)	0.865s	10	1.02x
🐘 Postgres	Nitro	1.155s (+0.6%)	2.013s (~)	0.858s	10	1.03x
🌐 MongoDB	Next.js (Turbopack)	1.314s	2.008s	0.694s	10	1.17x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	2.018s (-0.9%)	3.445s (-5.9% 🟢)	1.427s	10	1.00x
▲ Vercel	Nitro	2.103s (-4.5%)	3.464s (-9.5% 🟢)	1.360s	10	1.04x
▲ Vercel	Next.js (Turbopack)	⚠️ missing	-	-	-	-

🔍 Observability: Express | Nitro

workflow with 10 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🌐 Redis	🥇 Next.js (Turbopack)	10.750s	11.023s	0.273s	3	1.00x
💻 Local	Next.js (Turbopack)	10.836s	11.023s	0.187s	3	1.01x
💻 Local	Express	10.904s (-0.7%)	11.022s (~)	0.118s	3	1.01x
💻 Local	Nitro	10.908s (+2.7%)	11.023s (~)	0.115s	3	1.01x
🐘 Postgres	Next.js (Turbopack)	10.913s	11.041s	0.129s	3	1.02x
🐘 Postgres	Express	10.952s (+0.7%)	11.047s (~)	0.094s	3	1.02x
🐘 Postgres	Nitro	11.005s (~)	11.051s (-5.7% 🟢)	0.046s	3	1.02x
🌐 MongoDB	Next.js (Turbopack)	12.273s	13.025s	0.752s	3	1.14x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	16.881s (~)	18.363s (-1.9%)	1.482s	2	1.00x
▲ Vercel	Express	17.508s (+4.9%)	18.612s (+1.7%)	1.104s	2	1.04x
▲ Vercel	Next.js (Turbopack)	⚠️ missing	-	-	-	-

🔍 Observability: Nitro | Express

workflow with 25 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🌐 Redis	🥇 Next.js (Turbopack)	14.241s	15.029s	0.788s	4	1.00x
🐘 Postgres	Next.js (Turbopack)	14.514s	15.040s	0.526s	4	1.02x
💻 Local	Next.js (Turbopack)	14.591s	15.029s	0.438s	4	1.02x
🐘 Postgres	Express	14.761s (-45.6% 🟢)	15.048s (-46.4% 🟢)	0.287s	4	1.04x
🐘 Postgres	Nitro	14.835s (-45.6% 🟢)	15.047s (-46.4% 🟢)	0.212s	4	1.04x
💻 Local	Express	14.914s (-46.0% 🟢)	15.029s (-46.4% 🟢)	0.115s	4	1.05x
💻 Local	Nitro	14.936s (-44.2% 🟢)	15.028s (-44.4% 🟢)	0.091s	4	1.05x
🌐 MongoDB	Next.js (Turbopack)	17.794s	18.023s	0.229s	4	1.25x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	32.236s (-28.2% 🟢)	33.737s (-28.2% 🟢)	1.500s	2	1.00x
▲ Vercel	Express	32.352s (-28.7% 🟢)	33.700s (-27.7% 🟢)	1.348s	2	1.00x
▲ Vercel	Next.js (Turbopack)	⚠️ missing	-	-	-	-

🔍 Observability: Nitro | Express

workflow with 50 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🌐 Redis	🥇 Next.js (Turbopack)	13.407s	14.026s	0.619s	7	1.00x
🐘 Postgres	Next.js (Turbopack)	14.020s	14.752s	0.732s	7	1.05x
🐘 Postgres	Express	14.261s (-73.7% 🟢)	15.043s (-72.7% 🟢)	0.782s	6	1.06x
🐘 Postgres	Nitro	14.511s (-73.4% 🟢)	15.041s (-72.7% 🟢)	0.531s	6	1.08x
💻 Local	Next.js (Turbopack)	15.856s	16.195s	0.340s	6	1.18x
💻 Local	Express	16.361s (-71.1% 🟢)	17.028s (-70.2% 🟢)	0.667s	6	1.22x
💻 Local	Nitro	16.518s (-69.9% 🟢)	17.030s (-69.1% 🟢)	0.512s	6	1.23x
🌐 MongoDB	Next.js (Turbopack)	20.338s	21.024s	0.686s	5	1.52x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	55.697s (-45.2% 🟢)	57.320s (-44.5% 🟢)	1.623s	2	1.00x
▲ Vercel	Express	57.419s (-39.9% 🟢)	59.481s (-38.8% 🟢)	2.062s	2	1.03x
▲ Vercel	Next.js (Turbopack)	⚠️ missing	-	-	-	-

🔍 Observability: Nitro | Express

Promise.all with 10 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Next.js (Turbopack)	1.262s	2.010s	0.748s	15	1.00x
🐘 Postgres	Nitro	1.270s (-1.8%)	2.011s (~)	0.741s	15	1.01x
🐘 Postgres	Express	1.277s (~)	2.012s (~)	0.735s	15	1.01x
🌐 Redis	Next.js (Turbopack)	1.350s	2.007s	0.657s	15	1.07x
💻 Local	Nitro	1.486s (+0.7%)	2.005s (~)	0.519s	15	1.18x
💻 Local	Express	1.487s (-2.4%)	2.006s (~)	0.519s	15	1.18x
💻 Local	Next.js (Turbopack)	1.505s	2.005s	0.500s	15	1.19x
🌐 MongoDB	Next.js (Turbopack)	2.162s	3.008s	0.846s	10	1.71x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	2.392s (-3.6%)	3.621s (-7.0% 🟢)	1.228s	9	1.00x
▲ Vercel	Express	2.461s (+6.1% 🔺)	3.686s (-2.3%)	1.226s	9	1.03x
▲ Vercel	Next.js (Turbopack)	⚠️ missing	-	-	-	-

🔍 Observability: Nitro | Express

Promise.all with 25 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Next.js (Turbopack)	2.428s	3.012s	0.584s	10	1.00x
🐘 Postgres	Nitro	2.435s (-1.3%)	3.011s (~)	0.576s	10	1.00x
🐘 Postgres	Express	2.464s (~)	3.013s (~)	0.548s	10	1.02x
🌐 Redis	Next.js (Turbopack)	2.541s	3.008s	0.467s	10	1.05x
💻 Local	Next.js (Turbopack)	2.715s	3.007s	0.292s	10	1.12x
💻 Local	Express	2.926s (-3.9%)	3.207s (-7.1% 🟢)	0.281s	10	1.21x
💻 Local	Nitro	2.961s (+15.4% 🔺)	3.341s (+11.1% 🔺)	0.380s	9	1.22x
🌐 MongoDB	Next.js (Turbopack)	4.648s	5.177s	0.529s	6	1.91x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	2.512s (-7.7% 🟢)	3.942s (-3.5%)	1.430s	8	1.00x
▲ Vercel	Express	3.067s (+8.6% 🔺)	4.476s (+2.6%)	1.409s	7	1.22x
▲ Vercel	Next.js (Turbopack)	⚠️ missing	-	-	-	-

🔍 Observability: Nitro | Express

Promise.all with 50 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	3.568s (-0.9%)	4.013s (~)	0.446s	8	1.00x
🐘 Postgres	Express	3.639s (+1.7%)	4.014s (~)	0.375s	8	1.02x
🐘 Postgres	Next.js (Turbopack)	3.730s	4.013s	0.283s	8	1.05x
🌐 Redis	Next.js (Turbopack)	4.163s	4.869s	0.705s	7	1.17x
💻 Local	Next.js (Turbopack)	7.579s	8.267s	0.688s	4	2.12x
💻 Local	Express	8.222s (-3.8%)	9.021s (-2.7%)	0.799s	4	2.30x
💻 Local	Nitro	8.792s (+15.9% 🔺)	9.276s (+12.2% 🔺)	0.484s	4	2.46x
🌐 MongoDB	Next.js (Turbopack)	9.756s	10.351s	0.595s	3	2.73x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	3.097s (~)	4.100s (-5.1% 🟢)	1.003s	8	1.00x
▲ Vercel	Express	3.102s (+11.5% 🔺)	4.207s (-2.8%)	1.106s	8	1.00x
▲ Vercel	Next.js (Turbopack)	⚠️ missing	-	-	-	-

🔍 Observability: Nitro | Express

Promise.race with 10 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Next.js (Turbopack)	1.253s	2.010s	0.757s	15	1.00x
🐘 Postgres	Express	1.270s (+0.6%)	2.011s (~)	0.741s	15	1.01x
🐘 Postgres	Nitro	1.273s (-1.0%)	2.011s (~)	0.739s	15	1.02x
🌐 Redis	Next.js (Turbopack)	1.285s	2.006s	0.721s	15	1.03x
💻 Local	Nitro	1.512s (+1.2%)	2.005s (~)	0.493s	15	1.21x
💻 Local	Express	1.541s (-1.0%)	2.006s (~)	0.465s	15	1.23x
💻 Local	Next.js (Turbopack)	1.545s	2.006s	0.461s	15	1.23x
🌐 MongoDB	Next.js (Turbopack)	2.196s	3.007s	0.811s	10	1.75x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	2.152s (-34.5% 🟢)	3.394s (-28.0% 🟢)	1.242s	9	1.00x
▲ Vercel	Nitro	2.264s (-1.9%)	3.678s (-2.3%)	1.413s	9	1.05x
▲ Vercel	Next.js (Turbopack)	⚠️ missing	-	-	-	-

🔍 Observability: Express | Nitro

Promise.race with 25 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	2.447s (-1.2%)	3.012s (~)	0.565s	10	1.00x
🐘 Postgres	Express	2.449s (~)	3.013s (~)	0.563s	10	1.00x
🐘 Postgres	Next.js (Turbopack)	2.462s	3.011s	0.549s	10	1.01x
🌐 Redis	Next.js (Turbopack)	2.580s	3.008s	0.428s	10	1.05x
💻 Local	Next.js (Turbopack)	2.870s	3.565s	0.695s	9	1.17x
💻 Local	Nitro	3.007s (+13.7% 🔺)	3.676s (+22.2% 🔺)	0.669s	9	1.23x
💻 Local	Express	3.304s (~)	4.009s (-3.1%)	0.705s	8	1.35x
🌐 MongoDB	Next.js (Turbopack)	4.661s	5.177s	0.516s	6	1.90x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	2.360s (-11.7% 🟢)	3.402s (-14.9% 🟢)	1.042s	10	1.00x
▲ Vercel	Nitro	2.805s (+7.1% 🔺)	4.351s (+7.1% 🔺)	1.546s	8	1.19x
▲ Vercel	Next.js (Turbopack)	⚠️ missing	-	-	-	-

🔍 Observability: Express | Nitro

Promise.race with 50 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	3.611s (~)	4.014s (~)	0.403s	8	1.00x
🐘 Postgres	Express	3.676s (+1.9%)	4.142s (+3.1%)	0.466s	8	1.02x
🐘 Postgres	Next.js (Turbopack)	3.741s	4.014s	0.273s	8	1.04x
🌐 Redis	Next.js (Turbopack)	4.183s	5.012s	0.829s	6	1.16x
💻 Local	Express	8.411s (-5.3% 🟢)	9.021s (-2.7%)	0.610s	4	2.33x
💻 Local	Nitro	8.488s (+10.4% 🔺)	9.022s (+12.5% 🔺)	0.534s	4	2.35x
💻 Local	Next.js (Turbopack)	8.545s	9.018s	0.472s	4	2.37x
🌐 MongoDB	Next.js (Turbopack)	9.994s	10.349s	0.354s	3	2.77x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	2.713s (-13.9% 🟢)	4.152s (-13.9% 🟢)	1.438s	8	1.00x
▲ Vercel	Nitro	2.853s (-1.8%)	4.442s (+5.9% 🔺)	1.589s	7	1.05x
▲ Vercel	Next.js (Turbopack)	⚠️ missing	-	-	-	-

🔍 Observability: Express | Nitro

workflow with 10 sequential data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🌐 Redis	🥇 Next.js (Turbopack)	0.699s	1.005s	0.305s	60	1.00x
🐘 Postgres	Next.js (Turbopack)	0.802s	1.026s	0.224s	59	1.15x
💻 Local	Next.js (Turbopack)	0.852s	1.039s	0.187s	58	1.22x
🐘 Postgres	Nitro	0.869s	1.025s	0.157s	59	1.24x
🐘 Postgres	Express	0.891s	1.026s	0.135s	59	1.27x
💻 Local	Express	0.962s	1.021s	0.059s	59	1.38x
💻 Local	Nitro	0.965s	1.039s	0.074s	58	1.38x
🌐 MongoDB	Next.js (Turbopack)	2.146s	3.008s	0.862s	20	3.07x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	9.433s	11.042s	1.610s	6	1.00x
▲ Vercel	Express	9.806s	11.186s	1.379s	6	1.04x
▲ Vercel	Next.js (Turbopack)	⚠️ missing	-	-	-	-

🔍 Observability: Nitro | Express

workflow with 25 sequential data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🌐 Redis	🥇 Next.js (Turbopack)	1.712s	2.028s	0.316s	45	1.00x
🐘 Postgres	Next.js (Turbopack)	1.969s	2.177s	0.207s	42	1.15x
🐘 Postgres	Nitro	2.094s	2.947s	0.853s	31	1.22x
🐘 Postgres	Express	2.192s	3.012s	0.820s	30	1.28x
💻 Local	Next.js (Turbopack)	2.595s	3.007s	0.412s	30	1.52x
💻 Local	Express	2.951s	3.108s	0.157s	30	1.72x
💻 Local	Nitro	2.981s	3.378s	0.397s	27	1.74x
🌐 MongoDB	Next.js (Turbopack)	5.230s	6.011s	0.782s	15	3.05x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	30.761s	32.504s	1.742s	3	1.00x
▲ Vercel	Express	31.035s	31.966s	0.932s	3	1.01x
▲ Vercel	Next.js (Turbopack)	⚠️ missing	-	-	-	-

🔍 Observability: Nitro | Express

workflow with 50 sequential data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🌐 Redis	🥇 Next.js (Turbopack)	3.399s	4.009s	0.610s	30	1.00x
🐘 Postgres	Next.js (Turbopack)	4.028s	4.496s	0.468s	27	1.19x
🐘 Postgres	Nitro	4.349s	5.014s	0.666s	24	1.28x
🐘 Postgres	Express	4.412s	5.014s	0.602s	24	1.30x
💻 Local	Next.js (Turbopack)	8.389s	9.017s	0.628s	14	2.47x
💻 Local	Express	8.955s	9.478s	0.524s	13	2.63x
💻 Local	Nitro	9.038s	9.556s	0.518s	13	2.66x
🌐 MongoDB	Next.js (Turbopack)	10.635s	11.017s	0.382s	11	3.13x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	80.619s	82.195s	1.576s	2	1.00x
▲ Vercel	Express	82.249s	83.732s	1.483s	2	1.02x
▲ Vercel	Next.js (Turbopack)	⚠️ missing	-	-	-	-

🔍 Observability: Nitro | Express

workflow with 10 concurrent data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Next.js (Turbopack)	0.282s	1.009s	0.727s	60	1.00x
🐘 Postgres	Nitro	0.293s	1.009s	0.716s	60	1.04x
🐘 Postgres	Express	0.295s	1.009s	0.714s	60	1.05x
🌐 Redis	Next.js (Turbopack)	0.402s	1.004s	0.602s	60	1.43x
💻 Local	Next.js (Turbopack)	0.544s	1.004s	0.460s	60	1.93x
💻 Local	Nitro	0.575s	1.004s	0.429s	60	2.04x
💻 Local	Express	0.584s	1.004s	0.421s	60	2.07x
🌐 MongoDB	Next.js (Turbopack)	1.649s	2.149s	0.500s	28	5.85x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	1.748s	3.074s	1.326s	20	1.00x
▲ Vercel	Nitro	1.919s	3.245s	1.326s	19	1.10x
▲ Vercel	Next.js (Turbopack)	⚠️ missing	-	-	-	-

🔍 Observability: Express | Nitro

workflow with 25 concurrent data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	0.532s	1.009s	0.478s	90	1.00x
🐘 Postgres	Nitro	0.532s	1.009s	0.478s	90	1.00x
🐘 Postgres	Next.js (Turbopack)	0.544s	1.009s	0.466s	90	1.02x
🌐 Redis	Next.js (Turbopack)	1.192s	2.006s	0.814s	45	2.24x
💻 Local	Express	2.464s	3.009s	0.545s	30	4.64x
💻 Local	Nitro	2.482s	3.009s	0.527s	30	4.67x
💻 Local	Next.js (Turbopack)	2.487s	3.008s	0.522s	30	4.68x
🌐 MongoDB	Next.js (Turbopack)	4.759s	5.305s	0.545s	17	8.95x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	3.660s	5.000s	1.340s	19	1.00x
▲ Vercel	Nitro	3.745s	5.003s	1.258s	19	1.02x
▲ Vercel	Next.js (Turbopack)	⚠️ missing	-	-	-	-

🔍 Observability: Express | Nitro

workflow with 50 concurrent data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	0.899s	1.115s	0.217s	108	1.00x
🐘 Postgres	Next.js (Turbopack)	0.921s	1.146s	0.225s	105	1.02x
🐘 Postgres	Express	0.934s	1.193s	0.259s	101	1.04x
🌐 Redis	Next.js (Turbopack)	2.681s	3.007s	0.326s	40	2.98x
🌐 MongoDB	Next.js (Turbopack)	9.912s	10.517s	0.605s	12	11.03x
💻 Local	Next.js (Turbopack)	10.447s	10.934s	0.488s	11	11.63x
💻 Local	Express	10.953s	11.480s	0.527s	11	12.19x
💻 Local	Nitro	11.011s	11.754s	0.743s	11	12.25x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	8.078s	9.296s	1.218s	13	1.00x
▲ Vercel	Nitro	8.336s	9.648s	1.312s	13	1.03x
▲ Vercel	Next.js (Turbopack)	⚠️ missing	-	-	-	-

🔍 Observability: Express | Nitro

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)	0.173s	1.002s	0.011s	1.017s	0.844s	10	1.00x
🌐 Redis	Next.js (Turbopack)	0.178s	0.999s	0.002s	1.007s	0.829s	10	1.03x
💻 Local	Nitro	0.198s (+43.4% 🔺)	1.003s (~)	0.011s (+17.9% 🔺)	1.017s (~)	0.819s	10	1.14x
💻 Local	Express	0.201s (-1.2%)	1.003s (~)	0.011s (-4.3%)	1.017s (~)	0.816s	10	1.16x
🐘 Postgres	Next.js (Turbopack)	0.208s	1.001s	0.002s	1.013s	0.806s	10	1.20x
🐘 Postgres	Nitro	0.226s (-3.6%)	1.000s (~)	0.001s (~)	1.013s (~)	0.787s	10	1.31x
🐘 Postgres	Express	0.227s (+11.1% 🔺)	0.992s (-0.5%)	0.001s (-42.1% 🟢)	1.012s (~)	0.785s	10	1.31x
🌐 MongoDB	Next.js (Turbopack)	0.532s	0.928s	0.002s	1.009s	0.477s	10	3.08x

▲ Production (Vercel)

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	1.616s (+2.1%)	2.478s (+0.6%)	0.004s (-31.0% 🟢)	3.121s (+3.2%)	1.505s	10	1.00x
▲ Vercel	Nitro	1.749s (+4.7%)	3.049s (+25.9% 🔺)	0.006s (-98.5% 🟢)	3.518s (+2.8%)	1.769s	10	1.08x
▲ Vercel	Next.js (Turbopack)	⚠️ missing	-	-	-	-	-

🔍 Observability: Express | Nitro

stream pipeline with 5 transform steps (1MB)

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
🌐 Redis	🥇 Next.js (Turbopack)	0.551s	1.001s	0.003s	1.012s	0.461s	60	1.00x
💻 Local	Next.js (Turbopack)	0.655s	1.008s	0.010s	1.024s	0.369s	59	1.19x
🐘 Postgres	Next.js (Turbopack)	0.722s	1.009s	0.004s	1.027s	0.305s	59	1.31x
💻 Local	Express	0.725s	1.009s	0.010s	1.023s	0.298s	59	1.32x
🐘 Postgres	Express	0.728s	1.005s	0.004s	1.028s	0.300s	59	1.32x
💻 Local	Nitro	0.729s	1.009s	0.008s	1.023s	0.294s	59	1.32x
🐘 Postgres	Nitro	0.741s	1.022s	0.004s	1.047s	0.306s	59	1.35x
🌐 MongoDB	Next.js (Turbopack)	1.316s	1.954s	0.003s	2.013s	0.697s	30	2.39x

▲ Production (Vercel)

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	4.037s	5.004s	0.262s	5.830s	1.793s	11	1.00x
▲ Vercel	Nitro	9.232s	10.863s	0.196s	11.592s	2.360s	6	2.29x
▲ Vercel	Next.js (Turbopack)	⚠️ missing	-	-	-	-	-

🔍 Observability: Express | Nitro

10 parallel streams (1MB each)

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
🌐 Redis	🥇 Next.js (Turbopack)	0.793s	1.017s	0.000s	1.021s	0.229s	59	1.00x
🐘 Postgres	Express	0.901s	1.080s	0.000s	1.116s	0.216s	54	1.14x
🐘 Postgres	Next.js (Turbopack)	0.924s	1.112s	0.000s	1.121s	0.197s	54	1.17x
🐘 Postgres	Nitro	0.926s	1.146s	0.000s	1.164s	0.238s	52	1.17x
💻 Local	Express	1.222s	2.018s	0.000s	2.021s	0.798s	30	1.54x
💻 Local	Nitro	1.238s	2.020s	0.000s	2.023s	0.785s	30	1.56x
💻 Local	Next.js (Turbopack)	1.248s	2.019s	0.000s	2.023s	0.775s	30	1.57x
🌐 MongoDB	Next.js (Turbopack)	2.341s	2.949s	0.000s	3.008s	0.666s	20	2.95x

▲ Production (Vercel)

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	2.431s	3.173s	0.001s	3.666s	1.235s	17	1.00x
▲ Vercel	Express	2.775s	3.514s	0.000s	3.928s	1.152s	16	1.14x
▲ Vercel	Next.js (Turbopack)	⚠️ missing	-	-	-	-	-

🔍 Observability: Nitro | Express

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

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
🌐 Redis	🥇 Next.js (Turbopack)	1.508s	2.001s	0.000s	2.006s	0.498s	30	1.00x
🐘 Postgres	Express	1.881s	2.172s	0.000s	2.194s	0.313s	28	1.25x
🐘 Postgres	Nitro	1.920s	2.168s	0.000s	2.185s	0.265s	29	1.27x
🐘 Postgres	Next.js (Turbopack)	1.932s	2.188s	0.000s	2.225s	0.293s	27	1.28x
💻 Local	Express	3.417s	4.032s	0.001s	4.036s	0.619s	15	2.27x
💻 Local	Nitro	3.496s	4.101s	0.001s	4.105s	0.610s	15	2.32x
💻 Local	Next.js (Turbopack)	3.576s	4.163s	0.001s	4.168s	0.592s	15	2.37x
🌐 MongoDB	Next.js (Turbopack)	4.357s	4.952s	0.000s	5.009s	0.652s	12	2.89x

▲ Production (Vercel)

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	3.165s	4.134s	0.000s	4.621s	1.456s	13	1.00x
▲ Vercel	Express	3.325s	4.237s	0.000s	4.682s	1.357s	13	1.05x
▲ Vercel	Next.js (Turbopack)	⚠️ missing	-	-	-	-	-

🔍 Observability: Nitro | Express

Summary

Fastest Framework by World

Winner determined by most benchmark wins

World	🥇 Fastest Framework	Wins
💻 Local	Next.js (Turbopack)	14/21
🐘 Postgres	Next.js (Turbopack)	13/21
▲ Vercel	Nitro	11/21

Fastest World by Framework

Winner determined by most benchmark wins

Framework	🥇 Fastest World	Wins
Express	🐘 Postgres	13/21
Next.js (Turbopack)	🌐 Redis	9/21
Nitro	🐘 Postgres	14/21

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

❌ Some benchmark jobs failed:

Local: success
Postgres: success
Vercel: failure

Check the workflow run for details.

packages/next/src/builder-deferred.ts

pranaygp

@ijjk left a comment for code reuse but otherwise looks good

fix(builders) - support explicit project roots in swc transforms

397f518

AndrewBarba requested review from a team and ijjk as code owners March 16, 2026 16:49

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fix(builders) - normalize windows expectations in discovery test

2bf3f78

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ijjk reviewed Mar 17, 2026

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packages/next/src/builder-deferred.ts Show resolved Hide resolved

pranaygp reviewed Mar 18, 2026

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fix(next) - reuse outputFileTracingRoot for builder projectRoot

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AndrewBarba added 2 commits March 18, 2026 16:45

Merge branch 'main' into barba/codex/builder-explicit-project-root

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Merge branch 'main' into barba/codex/builder-explicit-project-root

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ijjk approved these changes Mar 20, 2026

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Merge branch 'main' into barba/codex/builder-explicit-project-root

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