Add discovered serializable classes in all context modes by TooTallNate · Pull Request #874 · vercel/workflow

TooTallNate · 2026-01-27T23:56:29Z

This PR ensures that all classes with custom serialization are automatically included in all bundle contexts (step, workflow, client) to ensure proper serialization/deserialization when crossing execution boundaries:

Classes defined in any context can now be properly serialized when passing data between:
- Client → Workflow (when starting workflows)
- Workflow → Step (when calling steps)
- Step → Workflow (when returning step results)
- Workflow → Client (when returning workflow results)
The build system now automatically discovers all files containing serializable classes and includes them in each bundle, regardless of where the class is originally defined.
No manual configuration is required - cross-registration happens automatically during the build process.

changeset-bot · 2026-01-27T23:56:33Z

🦋 Changeset detected

Latest commit: 5894707

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

This PR includes changesets to release 16 packages

Name	Type
@workflow/swc-plugin	Patch
@workflow/builders	Patch
@workflow/astro	Patch
@workflow/cli	Patch
@workflow/nest	Patch
@workflow/next	Patch
@workflow/nitro	Patch
@workflow/rollup	Patch
@workflow/sveltekit	Patch
@workflow/vite	Patch
workflow	Patch
@workflow/world-testing	Patch
@workflow/docs-typecheck	Patch
@workflow/nuxt	Patch
@workflow/core	Patch
@workflow/web-shared	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 · 2026-01-27T23:56:39Z

🧪 E2E Test Results

❌ Some tests failed

Summary

	Passed	Failed	Skipped	Total
✅ ▲ Vercel Production	468	0	38	506
✅ 💻 Local Development	428	0	32	460
✅ 📦 Local Production	428	0	32	460
✅ 🐘 Local Postgres	428	0	32	460
✅ 🪟 Windows	46	0	0	46
❌ 🌍 Community Worlds	31	165	0	196
✅ 📋 Other	126	0	12	138
Total	1955	165	146	2266

❌ Failed Tests

🌍 Community Worlds (165 failed)

mongodb (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
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
crossContextSerdeWorkflow - classes defined in step code are deserializable in workflow context
pages router addTenWorkflow via pages router
pages router promiseAllWorkflow via pages router
pages router sleepingWorkflow via pages router

redis (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
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
crossContextSerdeWorkflow - classes defined in step code are deserializable in workflow context
pages router addTenWorkflow via pages router
pages router promiseAllWorkflow via pages router
pages router sleepingWorkflow via pages router

starter (42 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
crossContextSerdeWorkflow - classes defined in step code are deserializable in workflow context
pages router addTenWorkflow via pages router
pages router promiseAllWorkflow via pages router
pages router sleepingWorkflow via pages router

turso (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
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
crossContextSerdeWorkflow - classes defined in step code are deserializable in workflow context
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	42	4
✅ example	42	4
✅ express	42	4
✅ fastify	42	4
✅ hono	42	4
✅ nextjs-turbopack	45	1
✅ nextjs-webpack	45	1
✅ nitro	42	4
✅ nuxt	42	4
✅ sveltekit	42	4
✅ vite	42	4

✅ 💻 Local Development

App	Passed	Skipped
✅ astro-stable	42	4
✅ express-stable	42	4
✅ fastify-stable	42	4
✅ hono-stable	42	4
✅ nextjs-turbopack-stable	46	0
✅ nextjs-webpack-stable	46	0
✅ nitro-stable	42	4
✅ nuxt-stable	42	4
✅ sveltekit-stable	42	4
✅ vite-stable	42	4

✅ 📦 Local Production

App	Passed	Skipped
✅ astro-stable	42	4
✅ express-stable	42	4
✅ fastify-stable	42	4
✅ hono-stable	42	4
✅ nextjs-turbopack-stable	46	0
✅ nextjs-webpack-stable	46	0
✅ nitro-stable	42	4
✅ nuxt-stable	42	4
✅ sveltekit-stable	42	4
✅ vite-stable	42	4

✅ 🐘 Local Postgres

App	Passed	Skipped
✅ astro-stable	42	4
✅ express-stable	42	4
✅ fastify-stable	42	4
✅ hono-stable	42	4
✅ nextjs-turbopack-stable	46	0
✅ nextjs-webpack-stable	46	0
✅ nitro-stable	42	4
✅ nuxt-stable	42	4
✅ sveltekit-stable	42	4
✅ vite-stable	42	4

✅ 🪟 Windows

App	Passed	Failed	Skipped
✅ nextjs-turbopack	46	0	0

❌ 🌍 Community Worlds

App	Passed	Failed
✅ mongodb-dev	3	0
❌ mongodb	5	41
✅ redis-dev	3	0
❌ redis	5	41
✅ starter-dev	3	0
❌ starter	4	42
✅ turso-dev	3	0
❌ turso	5	41

✅ 📋 Other

App	Passed	Skipped
✅ e2e-local-dev-nest-stable	42	4
✅ e2e-local-postgres-nest-stable	42	4
✅ e2e-local-prod-nest-stable	42	4

📋 View full workflow run

vercel · 2026-01-27T23:56:40Z

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	Feb 3, 2026 7:28am
example-nextjs-workflow-webpack	Ready	Preview, Comment, Open in v0	Feb 3, 2026 7:28am
example-workflow	Ready	Preview, Comment, Open in v0	Feb 3, 2026 7:28am
workbench-astro-workflow	Ready	Preview, Comment, Open in v0	Feb 3, 2026 7:28am
workbench-express-workflow	Ready	Preview, Comment, Open in v0	Feb 3, 2026 7:28am
workbench-fastify-workflow	Ready	Preview, Comment, Open in v0	Feb 3, 2026 7:28am
workbench-hono-workflow	Ready	Preview, Comment, Open in v0	Feb 3, 2026 7:28am
workbench-nitro-workflow	Ready	Preview, Comment, Open in v0	Feb 3, 2026 7:28am
workbench-nuxt-workflow	Ready	Preview, Comment, Open in v0	Feb 3, 2026 7:28am
workbench-sveltekit-workflow	Ready	Preview, Comment, Open in v0	Feb 3, 2026 7:28am
workbench-vite-workflow	Ready	Preview, Comment, Open in v0	Feb 3, 2026 7:28am
workflow-docs	Ready	Preview, Comment, Open in v0	Feb 3, 2026 7:28am
workflow-nest	Ready	Preview, Comment, Open in v0	Feb 3, 2026 7:28am

TooTallNate · 2026-01-27T23:56:51Z

Add support for "use step" functions in class instance methods #777 : 2 dependent PRs (#876 , #899 )
Add discovered serializable classes in all context modes #874 👈 (View in Graphite)
Ensure class serialization / deserialization only happens in the proper global context #873
Fix class ID generation when class is bound to a variable #872
Add discovery for custom classes with workflow serialization #859
main

This stack of pull requests is managed by Graphite. Learn more about stacking.

vercel

Additional Suggestion:

Step bundle does not include discoveredSerdeFiles, breaking cross-context class deserialization for Workflow → Step boundaries

TooTallNate · 2026-02-03T07:18:46Z

Merge activity

Feb 3, 7:18 AM UTC: A user started a stack merge that includes this pull request via Graphite.
Feb 3, 7:20 AM UTC: Graphite couldn't merge this pull request because a downstack PR Fix class ID generation when class is bound to a variable #872 failed to merge.
Feb 3, 7:22 AM UTC: A user started a stack merge that includes this pull request via Graphite.
Feb 3, 7:26 AM UTC: Graphite rebased this pull request as part of a merge.
Feb 3, 7:26 AM UTC: @TooTallNate merged this pull request with Graphite.

All classes that are Workflow serializable need to be registered and available in all context modes (client, workflow, step).

github-actions · 2026-02-03T07:25:48Z

📊 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	0.043s (+0.9%)	1.008s (~)	0.965s	10	1.00x
🐘 Postgres	Express	0.300s (+31.0% 🔺)	1.015s (~)	0.714s	10	6.92x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	0.688s (+17.6% 🔺)	1.552s (~)	0.864s	10	1.00x

🔍 Observability: Express

workflow with 1 step

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Express	1.117s (~)	2.009s (~)	0.892s	10	1.00x
🐘 Postgres	Express	2.143s (-5.2% 🟢)	3.015s (~)	0.872s	10	1.92x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	2.719s (-7.3% 🟢)	3.647s (-4.6%)	0.928s	10	1.00x

🔍 Observability: Express

workflow with 10 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Express	10.851s (~)	11.017s (~)	0.166s	5	1.00x
🐘 Postgres	Express	20.483s (+0.5%)	21.029s (~)	0.546s	5	1.89x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	22.691s (-2.5%)	23.271s (-2.4%)	0.580s	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	5.084s (-1.4%)	6.096s (-1.1%)	1.012s	5	1.00x
🐘 Postgres	Express	28.372s (-0.6%)	29.149s (~)	0.777s	2	5.58x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	3.232s (-12.3% 🟢)	4.077s (-9.7% 🟢)	0.845s	8	1.00x

🔍 Observability: Express

Promise.all with 25 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Express	5.231s (-1.2%)	6.232s (-0.9%)	1.001s	5	1.00x
🐘 Postgres	Express	33.923s (+2.4%)	34.335s (+3.5%)	0.412s	1	6.48x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	3.122s (~)	3.685s (-1.0%)	0.563s	9	1.00x

🔍 Observability: Express

Promise.race with 10 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Express	5.366s (~)	6.341s (~)	0.976s	5	1.00x
🐘 Postgres	Express	28.939s (-17.1% 🟢)	29.654s (-15.8% 🟢)	0.714s	2	5.39x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	3.045s (-5.7% 🟢)	3.636s (-11.1% 🟢)	0.591s	9	1.00x

🔍 Observability: Express

Promise.race with 25 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Express	5.575s (+1.9%)	6.546s (+1.6%)	0.971s	5	1.00x
🐘 Postgres	Express	31.468s (-3.9%)	32.083s (-3.0%)	0.615s	1	5.64x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	3.397s (-25.3% 🟢)	4.011s (-25.3% 🟢)	0.614s	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	0.189s (+0.8%)	0.994s (~)	0.016s (+9.4% 🔺)	1.025s (~)	0.837s	10	1.00x
🐘 Postgres	Express	2.298s (+7.2% 🔺)	2.744s (-5.4% 🟢)	0.000s (+100.0% 🔺)	3.014s (~)	0.716s	10	12.19x

▲ Production (Vercel)

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	2.930s (-4.0%)	3.191s (-1.0%)	0.730s (-15.5% 🟢)	4.430s (-4.9%)	1.501s	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

This was referenced Jan 27, 2026

Add discovery for custom classes with workflow serialization #859

Merged

Fix class ID generation when class is bound to a variable #872

Merged

Ensure class serialization / deserialization only happens in the proper global context #873

Merged

vercel bot deployed to Preview – workflow-docs January 27, 2026 23:59 View deployment

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TooTallNate mentioned this pull request Jan 30, 2026

Fix discovery of serde classes to detect [WORKFLOW_SERIALIZE] and [WORKFLOW_DESERIALIZE] computed property usage in bundled code #908

Open

VaguelySerious approved these changes Feb 2, 2026

View reviewed changes

TooTallNate changed the base branch from 01-27-ensure_class_serialization___deserialization_only_happens_in_the_proper_global_context to graphite-base/874 February 3, 2026 07:23

TooTallNate changed the base branch from graphite-base/874 to main February 3, 2026 07:24

TooTallNate added 3 commits February 3, 2026 07:25

Add discovered serializable classes in all context modes

a447abf

All classes that are Workflow serializable need to be registered and available in all context modes (client, workflow, step).

Add e2e and clean up a bit

846dfe6

Add serde symlinks to workbench apps for cross-context e2e test

5894707

TooTallNate force-pushed the 01-27-add_discovered_serializable_classes_in_all_context_modes branch from ab3dd44 to 5894707 Compare February 3, 2026 07:25

TooTallNate merged commit b5296a7 into main Feb 3, 2026
66 of 79 checks passed

TooTallNate deleted the 01-27-add_discovered_serializable_classes_in_all_context_modes branch February 3, 2026 07:26

vercel-release-bot mentioned this pull request Feb 3, 2026

Version Packages (beta) #921

Open

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TooTallNate commented Jan 27, 2026 •

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TooTallNate commented Jan 27, 2026 •

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TooTallNate commented Feb 3, 2026 •

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