Add discovery for custom classes with workflow serialization #859

TooTallNate · 2026-01-26T22:20:57Z

Added automatic discovery for custom classes with workflow serialization, allowing serialization classes to be defined in separate files without requiring explicit directives.

What changed?

Added detection for files containing custom class serialization patterns:
- Files importing from @workflow/serde
- Files using Symbol.for('workflow-serialize') or Symbol.for('workflow-deserialize')
Created shared utilities in transform-utils.ts for consistent pattern detection across all build tools
Updated Next.js, Nitro, Rollup, and Vite plugins to use the new detection patterns
Added exclusion logic to prevent re-processing of generated workflow files
Added tests to verify the pattern detection works correctly
Updated documentation in the SWC plugin spec to explain the new discovery mechanism

How to test?

Create a class with custom serialization in a separate file:

// models/point.js
export class Point {
  constructor(x, y) {
    this.x = x;
    this.y = y;
  }

  static [Symbol.for('workflow-serialize')](instance) {
    return { x: instance.x, y: instance.y };
  }

  static [Symbol.for('workflow-deserialize')](data) {
    return new Point(data.x, data.y);
  }
}

Import and use this class in a workflow or step file:

'use workflow';
import { Point } from '../models/point';

export function myWorkflow() {
  const point = new Point(10, 20);
  return point;
}

Verify the class is properly serialized when passed between client and server

Why make this change?

Previously, files containing custom serialization classes needed to include a 'use step' directive to be discovered and transformed, even if they weren't actual step functions. This was unintuitive and could lead to confusion.

This change allows for a more natural code organization pattern where model classes with serialization can be defined in their own files without requiring directives. The build system will automatically discover and transform these files to ensure the serialization works correctly when the classes are used in workflows or steps.

changeset-bot · 2026-01-26T22:21:01Z

🦋 Changeset detected

Latest commit: 14a46e1

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

This PR includes changesets to release 18 packages

Name	Type
@workflow/swc-plugin	Patch
@workflow/builders	Patch
@workflow/rollup	Patch
@workflow/next	Patch
@workflow/astro	Patch
@workflow/cli	Patch
@workflow/nest	Patch
@workflow/nitro	Patch
@workflow/sveltekit	Patch
@workflow/vite	Patch
workflow	Patch
@workflow/docs-typecheck	Patch
@workflow/world-testing	Patch
@workflow/example-nest	Patch
@workflow/nuxt	Patch
@workflow/ai	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 · 2026-01-26T22:21:06Z

📊 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 (-4.7%)	1.007s (~)	0.965s	10	1.00x
🐘 Postgres	Express	0.315s (+9.2% 🔺)	1.013s (~)	0.698s	10	7.47x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	0.649s (-16.1% 🟢)	1.534s (-5.8% 🟢)	0.884s	10	1.00x

🔍 Observability: Express

workflow with 1 step

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Express	1.115s (~)	2.007s (~)	0.892s	10	1.00x
🐘 Postgres	Express	2.171s (+2.4%)	3.014s (~)	0.843s	10	1.95x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	3.035s (+3.7%)	3.767s (+2.7%)	0.732s	10	1.00x

🔍 Observability: Express

workflow with 10 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Express	10.835s (~)	11.016s (~)	0.181s	5	1.00x
🐘 Postgres	Express	20.411s (~)	21.033s (~)	0.622s	5	1.88x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	23.095s (-3.8%)	24.115s (-2.4%)	1.020s	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	5.179s (-5.3% 🟢)	5.432s (-15.7% 🟢)	0.253s	6	1.00x
🐘 Postgres	Express	28.910s (+3.3%)	29.662s (+5.1% 🔺)	0.752s	2	5.58x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	3.296s (-8.0% 🟢)	3.764s (-5.3% 🟢)	0.468s	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	5.155s (-2.9%)	6.012s (-4.3%)	0.857s	6	1.00x
🐘 Postgres	Express	31.548s (-6.2% 🟢)	32.098s (-5.9% 🟢)	0.550s	1	6.12x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	3.223s (-3.4%)	3.802s (-4.9%)	0.579s	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	5.284s (-6.8% 🟢)	6.266s (-4.9%)	0.981s	5	1.00x
🐘 Postgres	Express	34.150s (-1.4%)	35.096s (~)	0.946s	1	6.46x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	3.122s (-5.7% 🟢)	3.682s (-7.4% 🟢)	0.560s	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	5.305s (-5.8% 🟢)	6.306s (-4.1%)	1.002s	5	1.00x
🐘 Postgres	Express	34.477s (+13.8% 🔺)	35.152s (+12.1% 🔺)	0.675s	1	6.50x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	3.443s (+4.4%)	4.067s (+4.5%)	0.624s	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	0.183s (-3.4%)	0.993s (~)	0.014s (-4.7%)	1.021s (~)	0.838s	10	1.00x
🐘 Postgres	Express	2.341s (+6.4% 🔺)	2.702s (-5.0%)	0.000s (~)	3.014s (~)	0.673s	10	12.80x

▲ Production (Vercel)

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	2.976s (-14.3% 🟢)	3.206s (-8.9% 🟢)	1.096s (-6.6% 🟢)	4.826s (-10.7% 🟢)	1.850s	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

github-actions · 2026-01-26T22:21:07Z

🧪 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

vercel · 2026-01-26T22:21:09Z

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 8:36pm
example-nextjs-workflow-webpack	Ready	Preview, Comment, Open in v0	Jan 30, 2026 8:36pm
example-workflow	Ready	Preview, Comment, Open in v0	Jan 30, 2026 8:36pm
workbench-astro-workflow	Ready	Preview, Comment, Open in v0	Jan 30, 2026 8:36pm
workbench-express-workflow	Ready	Preview, Comment, Open in v0	Jan 30, 2026 8:36pm
workbench-fastify-workflow	Ready	Preview, Comment, Open in v0	Jan 30, 2026 8:36pm
workbench-hono-workflow	Ready	Preview, Comment, Open in v0	Jan 30, 2026 8:36pm
workbench-nitro-workflow	Ready	Preview, Comment, Open in v0	Jan 30, 2026 8:36pm
workbench-nuxt-workflow	Ready	Preview, Comment, Open in v0	Jan 30, 2026 8:36pm
workbench-sveltekit-workflow	Ready	Preview, Comment, Open in v0	Jan 30, 2026 8:36pm
workbench-vite-workflow	Ready	Preview, Comment, Open in v0	Jan 30, 2026 8:36pm
workflow-docs	Ready	Preview, Comment, Open in v0	Jan 30, 2026 8:36pm
workflow-nest	Ready	Preview, Comment, Open in v0	Jan 30, 2026 8:36pm

TooTallNate · 2026-01-26T22:21:19Z

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
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 👈 (View in Graphite)
main

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

Create shared transform-utils.ts in @workflow/builders with: - Pattern detection (directives, serde imports, Symbol.for) - Path exclusion checks (generated files, SDK files) - Combined shouldTransformFile logic Update rollup, next, and vite packages to use shared utilities instead of duplicated regex patterns.

VaguelySerious

LGTM but would love @ijjk 's input

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, 7:19 AM UTC: @TooTallNate merged this pull request with Graphite.

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TooTallNate mentioned this pull request Jan 26, 2026

Enable custom class serialization transformations for "client" mode #860

Merged

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TooTallNate added 9 commits January 30, 2026 12:30

Fix Next turbopack case and vite

640f3c8

.

55d6ff9

.

35bd8a6

.

c4aaef4

Fix fetchWorkflow test case

b0fe05e

Rename test file to match module name

2107535

.

2f6dba2

.

14a46e1

TooTallNate force-pushed the 01-26-add_discovery_for_custom_classes_with_workflow_serialization branch from 42cb29f to 14a46e1 Compare January 30, 2026 20:33

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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

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VaguelySerious approved these changes Feb 2, 2026

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TooTallNate merged commit 8114792 into main Feb 3, 2026
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TooTallNate deleted the 01-26-add_discovery_for_custom_classes_with_workflow_serialization branch February 3, 2026 07:19

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

Version Packages (beta) #921

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Add discovery for custom classes with workflow serialization #859

Add discovery for custom classes with workflow serialization #859

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