[core] Add runtime and world backwards compatibility for specVersion v1 by VaguelySerious · Pull Request #894 · vercel/workflow

VaguelySerious · 2026-01-30T00:47:07Z

This extends world/core to:

Allow cancelling/starting v1 runs from v2 runtime
Allow resuming hooks with v1 payload format from v2 runtime

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

changeset-bot · 2026-01-30T00:47:10Z

🦋 Changeset detected

Latest commit: 569ad65

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

This PR includes changesets to release 15 packages

Name	Type
@workflow/core	Patch
@workflow/cli	Patch
@workflow/builders	Patch
@workflow/docs-typecheck	Patch
@workflow/next	Patch
@workflow/nitro	Patch
@workflow/web-shared	Patch
workflow	Patch
@workflow/world-testing	Patch
@workflow/astro	Patch
@workflow/nest	Patch
@workflow/sveltekit	Patch
@workflow/nuxt	Patch
@workflow/example-nest	Patch
@workflow/ai	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

vercel · 2026-01-30T00:47:13Z

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	Jan 30, 2026 8:31pm
example-nextjs-workflow-webpack	Ready	Preview, Comment, Open in v0	Jan 30, 2026 8:31pm
example-workflow	Ready	Preview, Comment, Open in v0	Jan 30, 2026 8:31pm
workbench-astro-workflow	Ready	Preview, Comment, Open in v0	Jan 30, 2026 8:31pm
workbench-express-workflow	Ready	Preview, Comment, Open in v0	Jan 30, 2026 8:31pm
workbench-fastify-workflow	Ready	Preview, Comment, Open in v0	Jan 30, 2026 8:31pm
workbench-hono-workflow	Ready	Preview, Comment, Open in v0	Jan 30, 2026 8:31pm
workbench-nitro-workflow	Ready	Preview, Comment, Open in v0	Jan 30, 2026 8:31pm
workbench-nuxt-workflow	Ready	Preview, Comment, Open in v0	Jan 30, 2026 8:31pm
workbench-sveltekit-workflow	Ready	Preview, Comment, Open in v0	Jan 30, 2026 8:31pm
workbench-vite-workflow	Ready	Preview, Comment, Open in v0	Jan 30, 2026 8:31pm
workflow-docs	Ready	Preview, Comment, Open in v0	Jan 30, 2026 8:31pm
workflow-nest	Ready	Preview, Comment, Open in v0	Jan 30, 2026 8:31pm

github-actions · 2026-01-30T00:47:17Z

🧪 E2E Test Results

❌ Some tests failed

Summary

	Passed	Failed	Skipped	Total
✅ ▲ Vercel Production	457	0	38	495
✅ 💻 Local Development	418	0	32	450
✅ 📦 Local Production	418	0	32	450
✅ 🐘 Local Postgres	418	0	32	450
✅ 🪟 Windows	45	0	0	45
❌ 🌍 Community Worlds	31	161	0	192
✅ 📋 Other	123	0	12	135
Total	1910	161	146	2217

❌ Failed Tests

🌍 Community Worlds (161 failed)

mongodb (40 failed):

addTenWorkflow
addTenWorkflow
should work with react rendering in step
promiseAllWorkflow
promiseRaceWorkflow
promiseAnyWorkflow
readableStreamWorkflow
hookWorkflow
webhookWorkflow
sleepingWorkflow
nullByteWorkflow
workflowAndStepMetadataWorkflow
outputStreamWorkflow
outputStreamInsideStepWorkflow - getWritable() called inside step functions
fetchWorkflow
promiseRaceStressTestWorkflow
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
concurrent hook token conflict - two workflows cannot use the same hook token simultaneously
stepFunctionPassingWorkflow - step function references can be passed as arguments (without closure vars)
stepFunctionWithClosureWorkflow - step function with closure variables passed as argument
closureVariableWorkflow - nested step functions with closure variables
spawnWorkflowFromStepWorkflow - spawning a child workflow using start() inside a step
pathsAliasWorkflow - TypeScript path aliases resolve correctly
Calculator.calculate - static workflow method using static step methods from another class
AllInOneService.processNumber - static workflow method using sibling static step methods
ChainableService.processWithThis - static step methods using this to reference the class
thisSerializationWorkflow - step function invoked with .call() and .apply()
customSerializationWorkflow - custom class serialization with WORKFLOW_SERIALIZE/WORKFLOW_DESERIALIZE
pages router addTenWorkflow via pages router
pages router promiseAllWorkflow via pages router
pages router sleepingWorkflow via pages router

redis (40 failed):

addTenWorkflow
addTenWorkflow
should work with react rendering in step
promiseAllWorkflow
promiseRaceWorkflow
promiseAnyWorkflow
readableStreamWorkflow
hookWorkflow
webhookWorkflow
sleepingWorkflow
nullByteWorkflow
workflowAndStepMetadataWorkflow
outputStreamWorkflow
outputStreamInsideStepWorkflow - getWritable() called inside step functions
fetchWorkflow
promiseRaceStressTestWorkflow
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
concurrent hook token conflict - two workflows cannot use the same hook token simultaneously
stepFunctionPassingWorkflow - step function references can be passed as arguments (without closure vars)
stepFunctionWithClosureWorkflow - step function with closure variables passed as argument
closureVariableWorkflow - nested step functions with closure variables
spawnWorkflowFromStepWorkflow - spawning a child workflow using start() inside a step
pathsAliasWorkflow - TypeScript path aliases resolve correctly
Calculator.calculate - static workflow method using static step methods from another class
AllInOneService.processNumber - static workflow method using sibling static step methods
ChainableService.processWithThis - static step methods using this to reference the class
thisSerializationWorkflow - step function invoked with .call() and .apply()
customSerializationWorkflow - custom class serialization with WORKFLOW_SERIALIZE/WORKFLOW_DESERIALIZE
pages router addTenWorkflow via pages router
pages router promiseAllWorkflow via pages router
pages router sleepingWorkflow via pages router

starter (41 failed):

addTenWorkflow
addTenWorkflow
should work with react rendering in step
promiseAllWorkflow
promiseRaceWorkflow
promiseAnyWorkflow
readableStreamWorkflow
hookWorkflow
webhookWorkflow
sleepingWorkflow
nullByteWorkflow
workflowAndStepMetadataWorkflow
outputStreamWorkflow
outputStreamInsideStepWorkflow - getWritable() called inside step functions
fetchWorkflow
promiseRaceStressTestWorkflow
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
concurrent hook token conflict - two workflows cannot use the same hook token simultaneously
stepFunctionPassingWorkflow - step function references can be passed as arguments (without closure vars)
stepFunctionWithClosureWorkflow - step function with closure variables passed as argument
closureVariableWorkflow - nested step functions with closure variables
spawnWorkflowFromStepWorkflow - spawning a child workflow using start() inside a step
health check (CLI) - workflow health command reports healthy endpoints
pathsAliasWorkflow - TypeScript path aliases resolve correctly
Calculator.calculate - static workflow method using static step methods from another class
AllInOneService.processNumber - static workflow method using sibling static step methods
ChainableService.processWithThis - static step methods using this to reference the class
thisSerializationWorkflow - step function invoked with .call() and .apply()
customSerializationWorkflow - custom class serialization with WORKFLOW_SERIALIZE/WORKFLOW_DESERIALIZE
pages router addTenWorkflow via pages router
pages router promiseAllWorkflow via pages router
pages router sleepingWorkflow via pages router

turso (40 failed):

addTenWorkflow
addTenWorkflow
should work with react rendering in step
promiseAllWorkflow
promiseRaceWorkflow
promiseAnyWorkflow
readableStreamWorkflow
hookWorkflow
webhookWorkflow
sleepingWorkflow
nullByteWorkflow
workflowAndStepMetadataWorkflow
outputStreamWorkflow
outputStreamInsideStepWorkflow - getWritable() called inside step functions
fetchWorkflow
promiseRaceStressTestWorkflow
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
concurrent hook token conflict - two workflows cannot use the same hook token simultaneously
stepFunctionPassingWorkflow - step function references can be passed as arguments (without closure vars)
stepFunctionWithClosureWorkflow - step function with closure variables passed as argument
closureVariableWorkflow - nested step functions with closure variables
spawnWorkflowFromStepWorkflow - spawning a child workflow using start() inside a step
pathsAliasWorkflow - TypeScript path aliases resolve correctly
Calculator.calculate - static workflow method using static step methods from another class
AllInOneService.processNumber - static workflow method using sibling static step methods
ChainableService.processWithThis - static step methods using this to reference the class
thisSerializationWorkflow - step function invoked with .call() and .apply()
customSerializationWorkflow - custom class serialization with WORKFLOW_SERIALIZE/WORKFLOW_DESERIALIZE
pages router addTenWorkflow via pages router
pages router promiseAllWorkflow via pages router
pages router sleepingWorkflow via pages router

Details by Category

✅ ▲ Vercel Production

App	Passed	Skipped
✅ astro	41	4
✅ example	41	4
✅ express	41	4
✅ fastify	41	4
✅ hono	41	4
✅ nextjs-turbopack	44	1
✅ nextjs-webpack	44	1
✅ nitro	41	4
✅ nuxt	41	4
✅ sveltekit	41	4
✅ vite	41	4

✅ 💻 Local Development

App	Passed	Skipped
✅ astro-stable	41	4
✅ express-stable	41	4
✅ fastify-stable	41	4
✅ hono-stable	41	4
✅ nextjs-turbopack-stable	45	0
✅ nextjs-webpack-stable	45	0
✅ nitro-stable	41	4
✅ nuxt-stable	41	4
✅ sveltekit-stable	41	4
✅ vite-stable	41	4

✅ 📦 Local Production

App	Passed	Skipped
✅ astro-stable	41	4
✅ express-stable	41	4
✅ fastify-stable	41	4
✅ hono-stable	41	4
✅ nextjs-turbopack-stable	45	0
✅ nextjs-webpack-stable	45	0
✅ nitro-stable	41	4
✅ nuxt-stable	41	4
✅ sveltekit-stable	41	4
✅ vite-stable	41	4

✅ 🐘 Local Postgres

App	Passed	Skipped
✅ astro-stable	41	4
✅ express-stable	41	4
✅ fastify-stable	41	4
✅ hono-stable	41	4
✅ nextjs-turbopack-stable	45	0
✅ nextjs-webpack-stable	45	0
✅ nitro-stable	41	4
✅ nuxt-stable	41	4
✅ sveltekit-stable	41	4
✅ vite-stable	41	4

✅ 🪟 Windows

App	Passed	Failed	Skipped
✅ nextjs-turbopack	45	0	0

❌ 🌍 Community Worlds

App	Passed	Failed
✅ mongodb-dev	3	0
❌ mongodb	5	40
✅ redis-dev	3	0
❌ redis	5	40
✅ starter-dev	3	0
❌ starter	4	41
✅ turso-dev	3	0
❌ turso	5	40

✅ 📋 Other

App	Passed	Skipped
✅ e2e-local-dev-nest-stable	41	4
✅ e2e-local-postgres-nest-stable	41	4
✅ e2e-local-prod-nest-stable	41	4

📋 View full workflow run

github-actions · 2026-01-30T00:47:17Z

📊 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	0.029s (-33.9% 🟢)	1.008s (~)	0.979s	10	1.00x
🐘 Postgres	Express	0.257s (-11.1% 🟢)	1.015s (~)	0.758s	10	8.76x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	0.717s (-7.3% 🟢)	1.749s (+7.5% 🔺)	1.032s	10	1.00x

🔍 Observability: Express

workflow with 1 step

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Express	1.080s (-3.4%)	2.008s (~)	0.928s	10	1.00x
🐘 Postgres	Express	2.196s (+3.6%)	3.016s (~)	0.820s	10	2.03x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	2.875s (-1.8%)	3.813s (+3.9%)	0.938s	10	1.00x

🔍 Observability: Express

workflow with 10 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Express	10.570s (-2.6%)	11.020s (~)	0.450s	5	1.00x
🐘 Postgres	Express	20.449s (~)	21.037s (~)	0.588s	5	1.93x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	23.156s (-3.5%)	24.187s (-2.1%)	1.031s	5	1.00x

🔍 Observability: Express

Promise.all with 10 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Express	4.318s (-21.1% 🟢)	5.273s (-18.1% 🟢)	0.955s	6	1.00x
🐘 Postgres	Express	30.180s (+7.9% 🔺)	30.631s (+8.6% 🔺)	0.450s	2	6.99x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	3.628s (+1.2%)	4.499s (+13.2% 🔺)	0.872s	7	1.00x

🔍 Observability: Express

Promise.all with 25 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Express	4.542s (-14.4% 🟢)	5.533s (-11.9% 🟢)	0.991s	6	1.00x
🐘 Postgres	Express	31.784s (-5.5% 🟢)	32.290s (-5.3% 🟢)	0.506s	1	7.00x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	3.594s (+7.8% 🔺)	4.217s (+5.5% 🔺)	0.624s	8	1.00x

🔍 Observability: Express

Promise.race with 10 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Express	4.712s (-16.9% 🟢)	5.682s (-13.8% 🟢)	0.969s	6	1.00x
🐘 Postgres	Express	34.627s (~)	35.079s (~)	0.452s	1	7.35x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	3.055s (-7.7% 🟢)	3.990s (~)	0.935s	8	1.00x

🔍 Observability: Express

Promise.race with 25 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Express	4.753s (-15.6% 🟢)	5.474s (-16.7% 🟢)	0.721s	6	1.00x
🐘 Postgres	Express	33.485s (+10.5% 🔺)	34.167s (+9.0% 🔺)	0.682s	1	7.05x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	3.384s (+2.7%)	4.123s (+5.9% 🔺)	0.739s	8	1.00x

🔍 Observability: Express

Stream Benchmarks (includes TTFB metrics)

workflow with stream

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Express	0.114s (-39.9% 🟢)	0.999s (+0.7%)	0.012s (-18.7% 🟢)	1.019s (~)	0.906s	10	1.00x
🐘 Postgres	Express	2.222s (+1.0%)	2.823s (-0.7%)	0.000s (~)	3.016s (~)	0.794s	10	19.52x

▲ Production (Vercel)

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	3.013s (-13.2% 🟢)	3.320s (-5.6% 🟢)	1.202s (+2.5%)	5.224s (-3.4%)	2.211s	10	1.00x

🔍 Observability: Express

Summary

Fastest Framework by World

Winner determined by most benchmark wins

World	🥇 Fastest Framework	Wins
💻 Local	Express	8/8
🐘 Postgres	Express	8/8
▲ Vercel	Express	8/8

Fastest World by Framework

Winner determined by most benchmark wins

Framework	🥇 Fastest World	Wins
Express	💻 Local	4/8

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

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

The endpoint was incorrectly formatted as `v2/runs/...` instead of `/v2/runs/...`, causing 404 errors when creating events via the v2 API. Signed-off-by: Peter Wielander <mittgfu@gmail.com> Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

VaguelySerious added 2 commits January 29, 2026 16:27

Fix encode

a34013c

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

Backwards compat for cancelling runs

86a7930

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

vercel Bot had a problem deploying to Preview – workflow-docs January 30, 2026 00:47 Failure

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vercel Bot reviewed Jan 30, 2026

View reviewed changes

Comment thread packages/cli/src/commands/cancel.ts Outdated

Comment thread packages/cli/src/lib/inspect/run.ts Outdated

VaguelySerious added 2 commits January 29, 2026 17:05

Start compat

b7dd1af

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

Fix

612c42e

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

vercel Bot deployed to Preview – workbench-fastify-workflow January 30, 2026 01:08 View deployment

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VaguelySerious added 2 commits January 30, 2026 11:59

Merge branch 'main' into peter/core-compat-v2

f499385

Fix?

065a41a

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

vercel Bot deployed to Preview – workbench-hono-workflow January 30, 2026 20:20 View deployment

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TooTallNate approved these changes Jan 30, 2026

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karthikscale3 approved these changes Jan 30, 2026

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vercel-release-bot mentioned this pull request Jan 30, 2026

Version Packages (beta) #834

Merged

TooTallNate mentioned this pull request Feb 16, 2026

Fix CLI missing specVersion in "run_cancelled" event payload #1078

Merged

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🧪 E2E Test Results

Summary

❌ Failed Tests

Details by Category

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📊 Benchmark Results

💻 Local Development

▲ Production (Vercel)

💻 Local Development

▲ Production (Vercel)

💻 Local Development

▲ Production (Vercel)

💻 Local Development

▲ Production (Vercel)

💻 Local Development

▲ Production (Vercel)

💻 Local Development

▲ Production (Vercel)

💻 Local Development

▲ Production (Vercel)

💻 Local Development

▲ Production (Vercel)

Summary

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3 participants

VaguelySerious commented Jan 30, 2026 •

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changeset-bot Bot commented Jan 30, 2026 •

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vercel Bot commented Jan 30, 2026 •

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github-actions Bot commented Jan 30, 2026 •

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github-actions Bot commented Jan 30, 2026 •

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