Allow disabling step sourcemap with new `sourcemap` option in builders by VaguelySerious · Pull Request #1842 · vercel/workflow

VaguelySerious · 2026-04-23T21:17:32Z

No description provided.

Signed-off-by: Peter Wielander <mittgfu@gmail.com>

vercel · 2026-04-23T21:17:38Z

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Project	Deployment	Actions	Updated (UTC)
example-nextjs-workflow-turbopack	Ready	Preview, Comment	Apr 28, 2026 10:51pm
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changeset-bot · 2026-04-23T21:17:40Z

🦋 Changeset detected

Latest commit: 67eb761

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

This PR includes changesets to release 17 packages

Name	Type
@workflow/builders	Minor
@workflow/nitro	Minor
@workflow/nest	Minor
@workflow/next	Minor
@workflow/sveltekit	Minor
@workflow/astro	Minor
@workflow/cli	Patch
@workflow/rollup	Patch
@workflow/vite	Patch
@workflow/vitest	Patch
@workflow/nuxt	Patch
workflow	Patch
@workflow/world-testing	Patch
@workflow/ai	Patch
@workflow/core	Patch
@workflow/web-shared	Patch
@workflow/web	Patch

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 · 2026-04-23T21:17:43Z

🧪 E2E Test Results

❌ Some tests failed

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	1050	4	86	1140
✅ 📋 Other	267	0	18	285
Total	4403	4	343	4750

❌ Failed Tests

🐘 Local Postgres (4 failed)

express-stable (2 failed):

fibonacciWorkflow - recursive workflow composition via start() | wrun_01KQB4WVAW2NVM7YX8415B7C9E
health check (queue-based) - workflow and step endpoints respond to health check messages

fastify-stable (2 failed):

fibonacciWorkflow - recursive workflow composition via start() | wrun_01KQB4WVAW2NVM7YX8415B7C9E
health check (queue-based) - workflow and step endpoints respond to health check messages

Details by Category

✅ ▲ Vercel Production

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

✅ 💻 Local Development

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

✅ 📦 Local Production

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

❌ 🐘 Local Postgres

App	Passed	Failed	Skipped
✅ astro-stable	89	0	6
❌ express-stable	87	2	6
❌ fastify-stable	87	2	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

✅ 📋 Other

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

📋 View full workflow run

❌ Some E2E test jobs failed:

Vercel Prod: success
Local Dev: success
Local Prod: success
Local Postgres: failure
Windows: cancelled

Check the workflow run for details.

github-actions · 2026-04-23T21:17:43Z

📊 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	🥇 Nitro	0.035s (-18.6% 🟢)	1.005s (~)	0.970s	10	1.00x
💻 Local	Express	0.039s (-11.3% 🟢)	1.005s (~)	0.966s	10	1.12x
🐘 Postgres	Next.js (Turbopack)	0.058s	1.010s	0.952s	10	1.66x
🐘 Postgres	Express	0.058s (+0.7%)	1.010s (~)	0.951s	10	1.66x
🐘 Postgres	Nitro	0.059s (-37.9% 🟢)	1.011s (-3.0%)	0.952s	10	1.68x
💻 Local	Next.js (Turbopack)	⚠️ missing	-	-	-	-

workflow with 1 step

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Nitro	1.091s (-3.6%)	2.005s (~)	0.914s	10	1.00x
💻 Local	Express	1.100s (-2.2%)	2.005s (~)	0.905s	10	1.01x
🐘 Postgres	Express	1.136s (-0.9%)	2.009s (~)	0.873s	10	1.04x
🐘 Postgres	Next.js (Turbopack)	1.143s	2.009s	0.867s	10	1.05x
🐘 Postgres	Nitro	1.148s (+0.7%)	2.008s (~)	0.860s	10	1.05x
💻 Local	Next.js (Turbopack)	⚠️ missing	-	-	-	-

workflow with 10 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Nitro	10.624s (-2.9%)	11.022s (~)	0.397s	3	1.00x
💻 Local	Express	10.660s (-2.4%)	11.021s (~)	0.362s	3	1.00x
🐘 Postgres	Next.js (Turbopack)	10.853s	11.018s	0.165s	3	1.02x
🐘 Postgres	Express	10.881s (-0.8%)	11.027s (~)	0.146s	3	1.02x
🐘 Postgres	Nitro	10.884s (~)	11.020s (~)	0.136s	3	1.02x
💻 Local	Next.js (Turbopack)	⚠️ missing	-	-	-	-

workflow with 25 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Nitro	14.186s (-5.8% 🟢)	15.029s (-6.2% 🟢)	0.843s	4	1.00x
💻 Local	Express	14.316s (-4.4%)	15.030s (~)	0.714s	4	1.01x
🐘 Postgres	Nitro	14.485s (-0.8%)	15.024s (~)	0.539s	4	1.02x
🐘 Postgres	Next.js (Turbopack)	14.501s	15.024s	0.523s	4	1.02x
🐘 Postgres	Express	14.556s (~)	15.022s (~)	0.467s	4	1.03x
💻 Local	Next.js (Turbopack)	⚠️ missing	-	-	-	-

workflow with 50 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Next.js (Turbopack)	13.935s	14.306s	0.370s	7	1.00x
🐘 Postgres	Express	13.938s (~)	14.161s (-3.0%)	0.223s	7	1.00x
🐘 Postgres	Nitro	13.988s (~)	14.593s (+2.0%)	0.605s	7	1.00x
💻 Local	Nitro	14.778s (-11.9% 🟢)	15.027s (-11.8% 🟢)	0.249s	6	1.06x
💻 Local	Express	15.137s (-8.8% 🟢)	16.030s (-5.9% 🟢)	0.893s	6	1.09x
💻 Local	Next.js (Turbopack)	⚠️ missing	-	-	-	-

Promise.all with 10 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Next.js (Turbopack)	1.249s	2.010s	0.760s	15	1.00x
🐘 Postgres	Nitro	1.267s (-0.6%)	2.009s (~)	0.742s	15	1.01x
🐘 Postgres	Express	1.275s (+1.1%)	2.009s (~)	0.735s	15	1.02x
💻 Local	Nitro	1.474s (-9.6% 🟢)	2.006s (-3.3%)	0.531s	15	1.18x
💻 Local	Express	1.505s (+1.1%)	2.006s (~)	0.501s	15	1.20x
💻 Local	Next.js (Turbopack)	⚠️ missing	-	-	-	-

Promise.all with 25 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	2.330s (-1.3%)	3.009s (~)	0.679s	10	1.00x
🐘 Postgres	Nitro	2.386s (+1.5%)	3.010s (~)	0.624s	10	1.02x
🐘 Postgres	Next.js (Turbopack)	2.397s	3.009s	0.613s	10	1.03x
💻 Local	Nitro	2.620s (-16.6% 🟢)	3.007s (-22.6% 🟢)	0.387s	10	1.12x
💻 Local	Express	2.758s (-6.6% 🟢)	3.008s (-12.9% 🟢)	0.250s	10	1.18x
💻 Local	Next.js (Turbopack)	⚠️ missing	-	-	-	-

Promise.all with 50 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	3.462s (-0.7%)	4.012s (~)	0.550s	8	1.00x
🐘 Postgres	Nitro	3.479s (~)	4.015s (~)	0.535s	8	1.00x
🐘 Postgres	Next.js (Turbopack)	3.627s	4.012s	0.384s	8	1.05x
💻 Local	Nitro	6.817s (-18.4% 🟢)	7.416s (-17.8% 🟢)	0.599s	5	1.97x
💻 Local	Express	7.351s (-11.8% 🟢)	8.017s (-11.2% 🟢)	0.666s	4	2.12x
💻 Local	Next.js (Turbopack)	⚠️ missing	-	-	-	-

Promise.race with 10 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Next.js (Turbopack)	1.224s	2.008s	0.785s	15	1.00x
🐘 Postgres	Express	1.248s (-0.7%)	2.007s (~)	0.759s	15	1.02x
🐘 Postgres	Nitro	1.254s (~)	2.008s (~)	0.754s	15	1.02x
💻 Local	Express	1.507s (-20.4% 🟢)	2.006s (-15.1% 🟢)	0.499s	15	1.23x
💻 Local	Nitro	1.854s (-0.6%)	2.392s (+2.2%)	0.538s	13	1.51x
💻 Local	Next.js (Turbopack)	⚠️ missing	-	-	-	-

Promise.race with 25 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	2.317s (-1.1%)	3.009s (~)	0.693s	10	1.00x
🐘 Postgres	Nitro	2.342s (~)	3.010s (~)	0.669s	10	1.01x
🐘 Postgres	Next.js (Turbopack)	2.410s	3.010s	0.601s	10	1.04x
💻 Local	Nitro	2.716s (-11.4% 🟢)	3.008s (-22.6% 🟢)	0.292s	10	1.17x
💻 Local	Express	2.861s (-8.7% 🟢)	3.110s (-17.3% 🟢)	0.249s	10	1.24x
💻 Local	Next.js (Turbopack)	⚠️ missing	-	-	-	-

Promise.race with 50 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	3.456s (-1.2%)	4.012s (~)	0.556s	8	1.00x
🐘 Postgres	Nitro	3.492s (~)	4.011s (~)	0.519s	8	1.01x
🐘 Postgres	Next.js (Turbopack)	3.638s	4.012s	0.374s	8	1.05x
💻 Local	Nitro	7.755s (-15.2% 🟢)	8.016s (-20.0% 🟢)	0.261s	4	2.24x
💻 Local	Express	8.229s (-6.5% 🟢)	9.016s (-2.8%)	0.787s	4	2.38x
💻 Local	Next.js (Turbopack)	⚠️ missing	-	-	-	-

workflow with 10 sequential data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Nitro	0.701s (-28.6% 🟢)	1.004s (-8.2% 🟢)	0.304s	60	1.00x
💻 Local	Express	0.744s (-24.4% 🟢)	1.005s (-6.6% 🟢)	0.261s	60	1.06x
🐘 Postgres	Next.js (Turbopack)	0.767s	1.006s	0.239s	60	1.10x
🐘 Postgres	Express	0.799s (-4.8%)	1.006s (-1.7%)	0.207s	60	1.14x
🐘 Postgres	Nitro	0.811s (-1.1%)	1.006s (~)	0.195s	60	1.16x
💻 Local	Next.js (Turbopack)	⚠️ missing	-	-	-	-

workflow with 25 sequential data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Next.js (Turbopack)	1.899s	2.053s	0.154s	44	1.00x
🐘 Postgres	Nitro	1.906s (-1.1%)	2.030s (-3.4%)	0.124s	45	1.00x
🐘 Postgres	Express	1.910s (-3.4%)	2.076s (-8.1% 🟢)	0.166s	44	1.01x
💻 Local	Nitro	2.232s (-26.5% 🟢)	3.007s (-20.0% 🟢)	0.776s	30	1.18x
💻 Local	Express	2.351s (-22.1% 🟢)	3.008s (-16.1% 🟢)	0.657s	30	1.24x
💻 Local	Next.js (Turbopack)	⚠️ missing	-	-	-	-

workflow with 50 sequential data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Next.js (Turbopack)	3.859s	4.075s	0.216s	30	1.00x
🐘 Postgres	Nitro	3.881s (-5.4% 🟢)	4.077s (-11.4% 🟢)	0.196s	30	1.01x
🐘 Postgres	Express	3.953s (-0.9%)	4.296s (-1.7%)	0.342s	28	1.02x
💻 Local	Nitro	7.232s (-22.2% 🟢)	8.014s (-20.0% 🟢)	0.783s	15	1.87x
💻 Local	Express	7.636s (-17.1% 🟢)	8.015s (-20.0% 🟢)	0.379s	15	1.98x
💻 Local	Next.js (Turbopack)	⚠️ missing	-	-	-	-

workflow with 10 concurrent data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Next.js (Turbopack)	0.264s	1.008s	0.743s	60	1.00x
🐘 Postgres	Nitro	0.281s (-0.8%)	1.007s (~)	0.726s	60	1.06x
🐘 Postgres	Express	0.286s (+1.4%)	1.006s (~)	0.720s	60	1.08x
💻 Local	Nitro	0.672s (+11.2% 🔺)	1.095s (+7.2% 🔺)	0.423s	55	2.54x
💻 Local	Express	0.688s (+22.8% 🔺)	1.096s (+9.1% 🔺)	0.407s	55	2.60x
💻 Local	Next.js (Turbopack)	⚠️ missing	-	-	-	-

workflow with 25 concurrent data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Next.js (Turbopack)	0.489s	1.007s	0.518s	90	1.00x
🐘 Postgres	Express	0.490s (-3.9%)	1.006s (~)	0.516s	90	1.00x
🐘 Postgres	Nitro	0.494s (~)	1.007s (~)	0.512s	90	1.01x
💻 Local	Nitro	2.453s (-3.4%)	3.008s (~)	0.555s	30	5.02x
💻 Local	Express	2.543s (+1.2%)	3.007s (~)	0.465s	30	5.20x
💻 Local	Next.js (Turbopack)	⚠️ missing	-	-	-	-

workflow with 50 concurrent data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Next.js (Turbopack)	0.774s	1.015s	0.241s	119	1.00x
🐘 Postgres	Nitro	0.794s (~)	1.008s (~)	0.214s	120	1.03x
🐘 Postgres	Express	0.810s (-1.1%)	1.017s (~)	0.207s	119	1.05x
💻 Local	Nitro	10.596s (-5.3% 🟢)	11.114s (-4.7%)	0.518s	11	13.69x
💻 Local	Express	10.996s (-1.7%)	11.479s (-3.9%)	0.483s	11	14.20x
💻 Local	Next.js (Turbopack)	⚠️ missing	-	-	-	-

Stream Benchmarks (includes TTFB metrics)

workflow with stream

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Nitro	0.145s (-31.9% 🟢)	1.004s (~)	0.009s (-26.4% 🟢)	1.015s (~)	0.869s	10	1.00x
💻 Local	Express	0.153s (-23.4% 🟢)	1.004s (~)	0.010s (-20.7% 🟢)	1.016s (~)	0.863s	10	1.05x
🐘 Postgres	Next.js (Turbopack)	0.189s	1.000s	0.001s	1.011s	0.821s	10	1.30x
🐘 Postgres	Express	0.203s (-0.9%)	0.996s (~)	0.001s (-18.8% 🟢)	1.010s (~)	0.807s	10	1.40x
🐘 Postgres	Nitro	0.209s (+2.1%)	0.995s (~)	0.001s (-20.0% 🟢)	1.010s (~)	0.801s	10	1.44x
💻 Local	Next.js (Turbopack)	⚠️ missing	-	-	-	-	-

stream pipeline with 5 transform steps (1MB)

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Nitro	0.604s (-28.0% 🟢)	1.011s (~)	0.010s (+3.5%)	1.023s (-8.3% 🟢)	0.419s	59	1.00x
🐘 Postgres	Next.js (Turbopack)	0.621s	1.009s	0.007s	1.025s	0.404s	59	1.03x
🐘 Postgres	Nitro	0.631s (+1.1%)	1.024s (+1.7%)	0.004s (~)	1.039s (+1.7%)	0.409s	58	1.04x
🐘 Postgres	Express	0.637s (+1.2%)	1.022s (+1.6%)	0.004s (+4.0%)	1.039s (+1.6%)	0.402s	58	1.06x
💻 Local	Express	0.703s (-7.1% 🟢)	1.011s (-1.7%)	0.010s (+10.4% 🔺)	1.116s (+7.3% 🔺)	0.413s	54	1.16x
💻 Local	Next.js (Turbopack)	⚠️ missing	-	-	-	-	-

10 parallel streams (1MB each)

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Next.js (Turbopack)	0.939s	1.177s	0.000s	1.187s	0.249s	51	1.00x
🐘 Postgres	Express	0.957s (~)	1.171s (-8.4% 🟢)	0.000s (-9.8% 🟢)	1.185s (-9.3% 🟢)	0.228s	51	1.02x
🐘 Postgres	Nitro	0.968s (~)	1.265s (+1.4%)	0.000s (-100.0% 🟢)	1.280s (+1.8%)	0.312s	48	1.03x
💻 Local	Nitro	1.187s (-2.9%)	2.019s (~)	0.000s (+66.7% 🔺)	2.021s (~)	0.834s	30	1.26x
💻 Local	Express	1.233s (+0.7%)	2.020s (~)	0.000s (-30.0% 🟢)	2.022s (~)	0.789s	30	1.31x
💻 Local	Next.js (Turbopack)	⚠️ missing	-	-	-	-	-

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

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	1.757s (-1.9%)	2.104s (-1.7%)	0.000s (-3.4%)	2.113s (-2.8%)	0.356s	29	1.00x
🐘 Postgres	Express	1.765s (~)	2.141s (-1.7%)	0.000s (+Infinity% 🔺)	2.153s (-2.1%)	0.388s	28	1.00x
🐘 Postgres	Next.js (Turbopack)	1.849s	2.147s	0.000s	2.153s	0.304s	28	1.05x
💻 Local	Nitro	3.424s (+1.1%)	3.970s (-1.5%)	0.001s (+75.8% 🔺)	3.974s (-1.5%)	0.550s	16	1.95x
💻 Local	Express	3.822s (+10.2% 🔺)	4.164s (+3.2%)	0.000s (-58.3% 🟢)	4.167s (+3.2%)	0.344s	15	2.17x
💻 Local	Next.js (Turbopack)	⚠️ missing	-	-	-	-	-

Summary

Fastest Framework by World

Winner determined by most benchmark wins

World	🥇 Fastest Framework	Wins
💻 Local	Nitro	20/21
🐘 Postgres	Next.js (Turbopack)	14/21

Fastest World by Framework

Winner determined by most benchmark wins

Framework	🥇 Fastest World	Wins
Express	🐘 Postgres	15/21
Next.js (Turbopack)	🐘 Postgres	21/21
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: failure
Postgres: success
Vercel: cancelled

Check the workflow run for details.

TooTallNate · 2026-04-23T21:31:50Z

(Coming over from #1843, which I just closed as a duplicate — this PR is more comprehensive, particularly the framework-wide coverage and docs updates.)

A few suggestions that came out of that branch, in case they're useful:

1. Consider using esbuild's native sourcemap vocabulary

Users can pick 'external' or 'linked' to emit a .map file separately — good for users who want sourcemaps shipped to their observability tooling but not inlined in the function bundle.
The SDK's vocabulary matches the underlying tool, which is one less thing to learn.
We drop the bespoke 'disabled' value (users would just write false).

Concretely the type would be:

export type SourcemapMode = boolean | 'inline' | 'linked' | 'external' | 'both';

2. Add a `WORKFLOW_SOURCEMAP` env-var override

Handy for CI overrides without touching framework config, and for users who want to flip this once when diagnosing a bundle-size issue. Accepts the same values as the config option, plus 'true' / 'false' / '0' / '1' strings. Config wins over env var; env var wins over the per-site default.

3. Preserve `EMIT_SOURCEMAPS_FOR_DEBUGGING` at the final-workflow + webhook sites

On the current diff, the final workflow bundle + webhook bundle lines become:

sourcemap: resolveSourcemap(this.config.sourcemap) ?? EMIT_SOURCEMAPS_FOR_DEBUGGING,

This is mostly right, but resolveSourcemap(true) returns true while esbuild's default for those sites was false (the env var was opt-in). So setting sourcemap: true in config now enables sourcemaps on the final wrapper and webhook, whereas before only WORKFLOW_EMIT_SOURCEMAPS_FOR_DEBUGGING=1 did. That might be the desired behavior (it's a bit more consistent), just worth calling out as a minor semantics change.

4. A unit test for the resolver

My branch had a small one you might want to steal — covers precedence (config > env var > default), the various env var strings, unrecognized values, and the sourcemapsEnabled derived getter. Link to the test file on the closed branch.

Happy to port any of these as follow-up commits if useful — they're all small.

Replace the bespoke `boolean | 'inline' | 'disabled'` type with esbuild's full `SourcemapMode` vocabulary (adds `'linked'`, `'external'`, `'both'`) so users can ship sourcemaps to observability tooling without bloating the function bundle. Add a `WORKFLOW_SOURCEMAP` env var as a cross-framework override; config wins over env, env wins over the per-bundle default. Flip `shouldAddSourcemapSupport` to track `sourcemapsEnabled` on the Vercel step function so disabling sourcemaps also drops the runtime shim. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Add sourcemap option to builders to allow disabling step sourcemap

61df28d

Signed-off-by: Peter Wielander <mittgfu@gmail.com>

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TooTallNate mentioned this pull request Apr 23, 2026

feat(builders,nitro): configurable sourcemap mode #1843

Closed

VaguelySerious marked this pull request as ready for review April 23, 2026 21:47

VaguelySerious requested a review from ijjk as a code owner April 23, 2026 21:47

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Merge branch 'main' into peter/allow-disable-step-sourcemaps

01606e6

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Merge branch 'main' into peter/allow-disable-step-sourcemaps

67eb761

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📊 Benchmark Results

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TooTallNate commented Apr 23, 2026

1. Consider using esbuild's native sourcemap vocabulary

2. Add a WORKFLOW_SOURCEMAP env-var override

3. Preserve EMIT_SOURCEMAPS_FOR_DEBUGGING at the final-workflow + webhook sites

4. A unit test for the resolver

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2. Add a `WORKFLOW_SOURCEMAP` env-var override

3. Preserve `EMIT_SOURCEMAPS_FOR_DEBUGGING` at the final-workflow + webhook sites