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Fix hasStepSourceMaps to return false for Vercel production builds #732

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pranaygp merged 1 commit into from
Jan 7, 2026
Merged

Fix hasStepSourceMaps to return false for Vercel production builds #732

pranaygp merged 1 commit into from
Jan 7, 2026

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@pranaygp pranaygp commented Jan 7, 2026

Summary

  • Step sourcemaps don't work in Vercel production deployments, causing e2e tests to fail
  • Updated hasStepSourceMaps() to return false when WORKFLOW_VERCEL_ENV === 'production'
  • Preserved existing behavior for preview builds (returns true except for sveltekit)

This is a follow-up fix to PR #720 which introduced step sourcemap tests.

@pranaygp
Fix hasStepSourceMaps to return false for Vercel production builds
18cf369 
Step sourcemaps don't work in Vercel production deployments.
Previously the function returned true for most frameworks on all
Vercel deployments. Now it correctly returns false for production
builds while preserving the existing behavior for preview builds.
Copilot AI review requested due to automatic review settings January 7, 2026 02:42
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⚠️ No Changeset found

Latest commit: 18cf369

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📊 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
🌐 Starter 🥇 Next.js (Turbopack) 0.039s (+3.5%) 1.014s (~) 0.976s 10 1.00x
💻 Local Next.js (Turbopack) 0.039s (-1.0%) 1.014s (~) 0.975s 10 1.01x
🌐 Redis Next.js (Turbopack) 0.043s (+13.3% 🔺) 1.017s (~) 0.975s 10 1.10x
💻 Local Express 0.043s (-0.9%) 1.007s (~) 0.964s 10 1.12x
💻 Local Nitro 0.044s (+5.3% 🔺) 1.007s (~) 0.963s 10 1.13x
🌐 MongoDB Next.js (Turbopack) 0.075s (-28.9% 🟢) 1.016s (~) 0.941s 10 1.94x
🌐 Turso Next.js (Turbopack) 0.109s (+2.2%) 1.015s (~) 0.905s 10 2.82x
🐘 Postgres Nitro 0.303s (+17.0% 🔺) 1.012s (~) 0.709s 10 7.80x
🐘 Postgres Next.js (Turbopack) 0.316s (+151.5% 🔺) 1.023s (~) 0.708s 10 8.13x
🐘 Postgres Express 0.359s (-9.2% 🟢) 1.014s (-2.7%) 0.655s 10 9.26x

▲ Production (Vercel)

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Nitro 0.554s (+6.7% 🔺) 1.463s (+5.6% 🔺) 0.909s 10 1.00x
▲ Vercel Next.js (Turbopack) 0.619s (+4.1%) 1.531s (+2.8%) 0.912s 10 1.12x
▲ Vercel Express 0.638s (+16.1% 🔺) 1.500s (-6.0% 🟢) 0.862s 10 1.15x

🔍 Observability: Nitro | Next.js (Turbopack) | Express

workflow with 1 step

💻 Local Development

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
🌐 Starter 🥇 Next.js (Turbopack) 1.088s (-0.5%) 2.010s (~) 0.922s 10 1.00x
🌐 Redis Next.js (Turbopack) 1.103s (~) 2.013s (~) 0.909s 10 1.01x
💻 Local Next.js (Turbopack) 1.105s (~) 2.010s (~) 0.906s 10 1.02x
💻 Local Nitro 1.112s (~) 2.006s (~) 0.894s 10 1.02x
💻 Local Express 1.113s (~) 2.006s (~) 0.893s 10 1.02x
🌐 Turso Next.js (Turbopack) 1.291s (+1.0%) 2.013s (~) 0.722s 10 1.19x
🌐 MongoDB Next.js (Turbopack) 1.311s (~) 2.013s (~) 0.701s 10 1.21x
🐘 Postgres Nitro 2.171s (+0.8%) 3.013s (~) 0.841s 10 2.00x
🐘 Postgres Express 2.210s (-7.8% 🟢) 3.012s (~) 0.802s 10 2.03x
🐘 Postgres Next.js (Turbopack) 2.225s (+19.6% 🔺) 3.018s (+49.2% 🔺) 0.793s 10 2.05x

▲ Production (Vercel)

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Express 2.714s (+1.3%) 3.718s (+0.7%) 1.003s 10 1.00x
▲ Vercel Next.js (Turbopack) 2.734s (-0.9%) 3.564s (~) 0.830s 10 1.01x
▲ Vercel Nitro 2.780s (+4.0%) 3.576s (+1.2%) 0.796s 10 1.02x

🔍 Observability: Express | Next.js (Turbopack) | Nitro

workflow with 10 sequential steps

💻 Local Development

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
🌐 Starter 🥇 Next.js (Turbopack) 10.601s (~) 11.011s (~) 0.410s 5 1.00x
💻 Local Next.js (Turbopack) 10.681s (~) 11.020s (~) 0.338s 5 1.01x
🌐 Redis Next.js (Turbopack) 10.701s (~) 11.019s (~) 0.318s 5 1.01x
💻 Local Express 10.785s (~) 11.011s (~) 0.226s 5 1.02x
💻 Local Nitro 10.793s (~) 11.011s (~) 0.218s 5 1.02x
🌐 MongoDB Next.js (Turbopack) 12.231s (~) 13.026s (~) 0.794s 5 1.15x
🌐 Turso Next.js (Turbopack) 12.255s (+0.6%) 13.028s (~) 0.772s 5 1.16x
🐘 Postgres Nitro 20.335s (-0.6%) 21.030s (~) 0.695s 5 1.92x
🐘 Postgres Express 20.345s (~) 21.033s (~) 0.688s 5 1.92x
🐘 Postgres Next.js (Turbopack) 20.416s (+34.7% 🔺) 21.039s (+31.2% 🔺) 0.624s 5 1.93x

▲ Production (Vercel)

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Next.js (Turbopack) 22.023s (~) 22.712s (-0.6%) 0.689s 5 1.00x
▲ Vercel Nitro 22.302s (+2.3%) 23.303s (+3.0%) 1.001s 5 1.01x
▲ Vercel Express 22.464s (+3.0%) 23.410s (+2.6%) 0.947s 5 1.02x

🔍 Observability: Next.js (Turbopack) | Nitro | Express

Promise.all with 10 concurrent steps

💻 Local Development

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
🌐 Starter 🥇 Next.js (Turbopack) 1.349s (~) 2.007s (~) 0.658s 15 1.00x
🌐 Redis Next.js (Turbopack) 1.378s (+1.6%) 2.012s (~) 0.634s 15 1.02x
💻 Local Next.js (Turbopack) 1.382s (-1.2%) 2.012s (~) 0.630s 15 1.02x
💻 Local Express 1.408s (~) 2.007s (~) 0.599s 15 1.04x
💻 Local Nitro 1.419s (+1.5%) 2.006s (~) 0.586s 15 1.05x
🌐 MongoDB Next.js (Turbopack) 2.140s (-0.6%) 3.014s (~) 0.874s 10 1.59x
🌐 Turso Next.js (Turbopack) 2.229s (~) 3.013s (~) 0.784s 10 1.65x
🐘 Postgres Express 2.422s (-7.2% 🟢) 3.012s (~) 0.590s 10 1.80x
🐘 Postgres Next.js (Turbopack) 2.444s (+38.3% 🔺) 3.020s (+50.1% 🔺) 0.576s 10 1.81x
🐘 Postgres Nitro 2.445s (+3.9%) 3.011s (~) 0.567s 10 1.81x

▲ Production (Vercel)

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Next.js (Turbopack) 3.261s (+6.4% 🔺) 3.876s (-0.6%) 0.615s 8 1.00x
▲ Vercel Nitro 3.292s (-12.6% 🟢) 3.883s (-15.4% 🟢) 0.591s 8 1.01x
▲ Vercel Express 3.759s (+9.7% 🔺) 4.384s (+1.3%) 0.625s 8 1.15x

🔍 Observability: Next.js (Turbopack) | Nitro | Express

Promise.all with 25 concurrent steps

💻 Local Development

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
💻 Local 🥇 Next.js (Turbopack) 2.092s (-4.9%) 2.976s (-3.2%) 0.884s 11 1.00x
💻 Local Nitro 2.188s (~) 3.139s (~) 0.951s 10 1.05x
💻 Local Express 2.206s (~) 3.175s (+0.5%) 0.969s 10 1.05x
🌐 Starter Next.js (Turbopack) 2.463s (~) 3.009s (~) 0.546s 10 1.18x
🌐 Redis Next.js (Turbopack) 2.525s (+2.5%) 3.012s (~) 0.487s 10 1.21x
🐘 Postgres Next.js (Turbopack) 2.768s (+7.6% 🔺) 3.016s (~) 0.247s 10 1.32x
🐘 Postgres Nitro 2.879s (-4.5%) 3.114s (-15.9% 🟢) 0.235s 10 1.38x
🐘 Postgres Express 2.915s (+7.3% 🔺) 3.220s (~) 0.306s 10 1.39x
🌐 Turso Next.js (Turbopack) 4.598s (-2.1%) 5.184s (~) 0.586s 6 2.20x
🌐 MongoDB Next.js (Turbopack) 4.747s (+2.5%) 5.180s (~) 0.433s 6 2.27x

▲ Production (Vercel)

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Express 4.029s (+14.7% 🔺) 5.007s (+13.4% 🔺) 0.979s 6 1.00x
▲ Vercel Next.js (Turbopack) 4.454s (+5.6% 🔺) 5.215s (+8.9% 🔺) 0.760s 6 1.11x
▲ Vercel Nitro 4.999s (-4.6%) 5.764s (-6.3% 🟢) 0.765s 6 1.24x

🔍 Observability: Express | Next.js (Turbopack) | Nitro

Promise.race with 10 concurrent steps

💻 Local Development

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
🌐 Starter 🥇 Next.js (Turbopack) 1.362s (~) 2.008s (~) 0.645s 15 1.00x
🌐 Redis Next.js (Turbopack) 1.379s (+2.5%) 2.010s (~) 0.631s 15 1.01x
💻 Local Express 1.404s (-3.9%) 2.005s (~) 0.601s 15 1.03x
💻 Local Next.js (Turbopack) 1.413s (~) 2.013s (~) 0.600s 15 1.04x
💻 Local Nitro 1.414s (-0.7%) 2.005s (~) 0.591s 15 1.04x
🐘 Postgres Next.js (Turbopack) 1.672s (+6.1% 🔺) 2.012s (~) 0.340s 15 1.23x
🐘 Postgres Nitro 1.863s (-3.4%) 2.079s (~) 0.216s 15 1.37x
🐘 Postgres Express 2.006s (+19.2% 🔺) 2.155s (+7.1% 🔺) 0.150s 14 1.47x
🌐 MongoDB Next.js (Turbopack) 2.127s (~) 3.011s (~) 0.884s 10 1.56x
🌐 Turso Next.js (Turbopack) 2.228s (-0.6%) 3.014s (~) 0.786s 10 1.64x

▲ Production (Vercel)

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Nitro 2.826s (+2.7%) 3.918s (+10.0% 🔺) 1.092s 9 1.00x
▲ Vercel Express 3.114s (+13.1% 🔺) 4.547s (+24.2% 🔺) 1.433s 7 1.10x
▲ Vercel Next.js (Turbopack) 3.304s (+20.6% 🔺) 4.053s (+13.5% 🔺) 0.748s 8 1.17x

🔍 Observability: Nitro | Express | Next.js (Turbopack)

Promise.race with 25 concurrent steps

💻 Local Development

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
💻 Local 🥇 Next.js (Turbopack) 2.115s (-2.2%) 2.945s (-2.0%) 0.829s 11 1.00x
💻 Local Nitro 2.224s (~) 3.174s (~) 0.950s 10 1.05x
💻 Local Express 2.233s (-1.4%) 3.192s (~) 0.958s 10 1.06x
🐘 Postgres Next.js (Turbopack) 2.490s (-1.8%) 3.024s (~) 0.534s 10 1.18x
🌐 Redis Next.js (Turbopack) 2.516s (+1.9%) 3.014s (~) 0.498s 10 1.19x
🌐 Starter Next.js (Turbopack) 2.523s (+2.4%) 3.009s (~) 0.486s 10 1.19x
🐘 Postgres Express 2.745s (+1.5%) 3.012s (~) 0.267s 10 1.30x
🐘 Postgres Nitro 2.770s (+5.4% 🔺) 3.015s (~) 0.245s 10 1.31x
🌐 Turso Next.js (Turbopack) 4.660s (-1.3%) 5.183s (~) 0.522s 6 2.20x
🌐 MongoDB Next.js (Turbopack) 4.715s (~) 5.181s (~) 0.466s 6 2.23x

▲ Production (Vercel)

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Express 3.478s (-6.0% 🟢) 4.177s (-5.6% 🟢) 0.698s 8 1.00x
▲ Vercel Nitro 3.526s (+13.2% 🔺) 4.022s (+13.2% 🔺) 0.496s 8 1.01x
▲ Vercel Next.js (Turbopack) 4.631s (+45.6% 🔺) 5.525s (+52.5% 🔺) 0.893s 6 1.33x

🔍 Observability: Express | Nitro | Next.js (Turbopack)

Stream Benchmarks (includes TTFB metrics)
workflow with stream

💻 Local Development

World Framework Workflow Time TTFB Slurp Wall Time Overhead Samples vs Fastest
🌐 Starter 🥇 Next.js (Turbopack) 0.128s (-7.8% 🟢) 1.005s (~) 0.000s (NaN%) 1.011s (~) 0.883s 10 1.00x
💻 Local Next.js (Turbopack) 0.138s (+1.3%) 1.004s (~) 0.016s (-3.6%) 1.027s (~) 0.889s 10 1.08x
🌐 Redis Next.js (Turbopack) 0.158s (+13.7% 🔺) 1.006s (~) 0.000s (-100.0% 🟢) 1.016s (~) 0.858s 10 1.23x
💻 Local Nitro 0.176s (+2.6%) 0.993s (~) 0.014s (-10.0% 🟢) 1.020s (~) 0.844s 10 1.38x
💻 Local Express 0.177s (~) 0.992s (~) 0.017s (+8.4% 🔺) 1.023s (~) 0.846s 10 1.39x
🌐 MongoDB Next.js (Turbopack) 0.456s (-12.0% 🟢) 0.991s (+6.4% 🔺) 0.000s (+Infinity% 🔺) 1.012s (~) 0.556s 10 3.57x
🌐 Turso Next.js (Turbopack) 0.498s (+10.0% 🔺) 0.957s (-4.4%) 0.000s (-100.0% 🟢) 1.016s (~) 0.517s 10 3.90x
🐘 Postgres Next.js (Turbopack) 2.173s (+99.5% 🔺) 2.874s (+67.5% 🔺) 0.000s (NaN%) 3.021s (+66.2% 🔺) 0.848s 10 17.01x
🐘 Postgres Express 2.343s (+7.4% 🔺) 2.701s (-5.5% 🟢) 0.000s (NaN%) 3.015s (~) 0.671s 10 18.34x
🐘 Postgres Nitro 2.359s (+4.3%) 2.683s (-3.5%) 0.000s (+Infinity% 🔺) 3.014s (~) 0.654s 10 18.46x

▲ Production (Vercel)

World Framework Workflow Time TTFB Slurp Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Express 2.884s (+10.7% 🔺) 3.200s (~) 0.664s (+165.2% 🔺) 4.430s (+24.7% 🔺) 1.546s 10 1.00x
▲ Vercel Next.js (Turbopack) 2.908s (+6.8% 🔺) 3.355s (+6.9% 🔺) 0.462s (+47.3% 🔺) 4.288s (+9.5% 🔺) 1.380s 10 1.01x
▲ Vercel Nitro 3.079s (+16.5% 🔺) 3.284s (+4.5%) 0.688s (+151.3% 🔺) 4.597s (+19.9% 🔺) 1.517s 10 1.07x

🔍 Observability: Express | Next.js (Turbopack) | Nitro

Summary

Fastest Framework by World

Winner determined by most benchmark wins

World 🥇 Fastest Framework Wins
💻 Local Next.js (Turbopack) 7/8
🐘 Postgres Next.js (Turbopack) 4/8
▲ Vercel Express 4/8
Fastest World by Framework

Winner determined by most benchmark wins

Framework 🥇 Fastest World Wins
Express 💻 Local 8/8
Next.js (Turbopack) 🌐 Starter 6/8
Nitro 💻 Local 8/8
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
  • 🌐 Starter: Community world (local development)
  • 🌐 Turso: Community world (local development)
  • 🌐 MongoDB: Community world (local development)
  • 🌐 Redis: Community world (local development)
  • 🌐 Jazz: Community world (local development)

📋 View full workflow run

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github-actions bot commented Jan 7, 2026 •
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🧪 E2E Test Results

❌ Some tests failed

Summary

Passed Failed Skipped Total
❌ ▲ Vercel Production 362 1 11 374
✅ 💻 Local Development 332 0 8 340
✅ 📦 Local Production 332 0 8 340
✅ 🐘 Local Postgres 332 0 8 340
✅ 🪟 Windows 34 0 0 34
❌ 🌍 Community Worlds 131 17 0 148
Total 1523 18 35 1576

❌ Failed Tests

▲ Vercel Production (1 failed)

nuxt (1 failed):

  • promiseRaceWorkflow
🌍 Community Worlds (17 failed)

mongodb (1 failed):

  • webhookWorkflow

redis (1 failed):

  • webhookWorkflow

starter (14 failed):

  • addTenWorkflow
  • addTenWorkflow
  • 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 catchability FatalError can be caught and detected with FatalError.is()
  • hookCleanupTestWorkflow - hook token reuse after workflow completion
  • stepFunctionPassingWorkflow - step function references can be passed as arguments (without closure vars)
  • stepFunctionWithClosureWorkflow - step function with closure variables passed as argument
  • spawnWorkflowFromStepWorkflow - spawning a child workflow using start() inside a step
  • pathsAliasWorkflow - TypeScript path aliases resolve correctly

turso (1 failed):

  • webhookWorkflow

Details by Category

❌ ▲ Vercel Production
App Passed Failed Skipped
✅ astro 33 0 1
✅ example 33 0 1
✅ express 33 0 1
✅ fastify 33 0 1
✅ hono 33 0 1
✅ nextjs-turbopack 33 0 1
✅ nextjs-webpack 33 0 1
✅ nitro 33 0 1
❌ nuxt 32 1 1
✅ sveltekit 33 0 1
✅ vite 33 0 1
✅ 💻 Local Development
App Passed Failed Skipped
✅ astro-stable 33 0 1
✅ express-stable 33 0 1
✅ fastify-stable 33 0 1
✅ hono-stable 33 0 1
✅ nextjs-turbopack-stable 34 0 0
✅ nextjs-webpack-stable 34 0 0
✅ nitro-stable 33 0 1
✅ nuxt-stable 33 0 1
✅ sveltekit-stable 33 0 1
✅ vite-stable 33 0 1
✅ 📦 Local Production
App Passed Failed Skipped
✅ astro-stable 33 0 1
✅ express-stable 33 0 1
✅ fastify-stable 33 0 1
✅ hono-stable 33 0 1
✅ nextjs-turbopack-stable 34 0 0
✅ nextjs-webpack-stable 34 0 0
✅ nitro-stable 33 0 1
✅ nuxt-stable 33 0 1
✅ sveltekit-stable 33 0 1
✅ vite-stable 33 0 1
✅ 🐘 Local Postgres
App Passed Failed Skipped
✅ astro-stable 33 0 1
✅ express-stable 33 0 1
✅ fastify-stable 33 0 1
✅ hono-stable 33 0 1
✅ nextjs-turbopack-stable 34 0 0
✅ nextjs-webpack-stable 34 0 0
✅ nitro-stable 33 0 1
✅ nuxt-stable 33 0 1
✅ sveltekit-stable 33 0 1
✅ vite-stable 33 0 1
✅ 🪟 Windows
App Passed Failed Skipped
✅ nextjs-turbopack 34 0 0
❌ 🌍 Community Worlds
App Passed Failed Skipped
✅ mongodb-dev 3 0 0
❌ mongodb 33 1 0
✅ redis-dev 3 0 0
❌ redis 33 1 0
✅ starter-dev 3 0 0
❌ starter 20 14 0
✅ turso-dev 3 0 0
❌ turso 33 1 0

📋 View full workflow run

❌ Some E2E test jobs failed:

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

Check the workflow run for details.

Copilot AI reviewed Jan 7, 2026
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Pull request overview

This PR fixes an issue where step sourcemap tests were failing in Vercel production deployments by updating the hasStepSourceMaps() function to return false when running in production environments. The change correctly differentiates between Vercel production and preview builds.

Key Changes:

  • Added early return check for Vercel production environments (WORKFLOW_VERCEL_ENV === 'production')
  • Updated comment to clarify that preview builds (not all Vercel builds) support step source maps for most frameworks

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@pranaygp pranaygp merged commit 7268d2f into main Jan 7, 2026
95 of 96 checks passed
@pranaygp pranaygp deleted the pranaygp/fix-step-sourcemaps-vercel-prod branch January 7, 2026 06:19
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