Add optional `writeToStreamMulti` function to the World interface #867

TooTallNate · 2026-01-27T18:18:44Z

Added an optional writeToStreamMulti function to the World interface to optimize batch writing of multiple chunks to a stream.

This is an alternative solution to the issue reported in #764.

What changed?

Added an optional writeToStreamMulti method to the Streamer interface in the World API
Implemented buffering in WorkflowServerWritableStream to batch chunks before flushing
Added implementations of writeToStreamMulti in all world providers:
- world-local: Writes multiple chunks in parallel while preserving order
- world-postgres: Performs a batch insert for all chunks
- world-vercel: Encodes multiple chunks into a length-prefixed binary format
Added a constant STREAM_FLUSH_INTERVAL_MS (10ms) to control buffer flush timing

Why make this change?

This optimization reduces network overhead when writing many small chunks to a stream by batching them together. This is particularly beneficial for:

The Vercel world implementation where each write previously required a separate HTTP request
The Postgres world implementation where batch inserts are more efficient
Any scenario with high-frequency, small writes to streams

The implementation gracefully falls back to sequential writes for world implementations that don't support the new method.

changeset-bot · 2026-01-27T18:18:48Z

🦋 Changeset detected

Latest commit: 4d74746

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

This PR includes changesets to release 17 packages

Name	Type
@workflow/world-postgres	Patch
@workflow/world-vercel	Patch
@workflow/world-local	Patch
@workflow/world	Patch
@workflow/core	Patch
@workflow/cli	Patch
@workflow/web-shared	Patch
@workflow/world-testing	Patch
@workflow/builders	Patch
@workflow/docs-typecheck	Patch
@workflow/next	Patch
@workflow/nitro	Patch
workflow	Patch
@workflow/astro	Patch
@workflow/nest	Patch
@workflow/sveltekit	Patch
@workflow/nuxt	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 · 2026-01-27T18:18:54Z

🧪 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 · 2026-01-27T18:18:55Z

📊 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%)	1.007s (~)	0.965s	10	1.00x
🐘 Postgres	Express	0.279s (+21.6% 🔺)	1.015s (~)	0.736s	10	6.55x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	0.654s (+11.9% 🔺)	1.522s (-1.7%)	0.868s	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 (~)	2.007s (~)	0.890s	10	1.00x
🐘 Postgres	Express	2.122s (-6.1% 🟢)	3.015s (~)	0.893s	10	1.90x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	3.234s (+10.2% 🔺)	3.998s (+4.6%)	0.764s	10	1.00x

🔍 Observability: Express

workflow with 10 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Express	10.833s (~)	11.017s (~)	0.185s	5	1.00x
🐘 Postgres	Express	20.443s (~)	21.036s (~)	0.593s	5	1.89x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	22.958s (-1.4%)	24.342s (+2.1%)	1.383s	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	5.169s (~)	6.020s (-2.3%)	0.850s	6	1.00x
🐘 Postgres	Express	30.768s (+7.8% 🔺)	31.687s (+8.8% 🔺)	0.918s	2	5.95x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	3.277s (-11.1% 🟢)	3.843s (-14.8% 🟢)	0.567s	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	5.267s (-0.6%)	6.263s (~)	0.996s	5	1.00x
🐘 Postgres	Express	30.557s (-7.8% 🟢)	31.135s (-6.2% 🟢)	0.578s	1	5.80x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	3.415s (+9.8% 🔺)	4.046s (+8.7% 🔺)	0.631s	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	5.388s (~)	6.340s (~)	0.952s	5	1.00x
🐘 Postgres	Express	33.963s (-2.7%)	34.283s (-2.6%)	0.320s	1	6.30x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	3.226s (~)	3.931s (-3.9%)	0.705s	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	5.538s (+1.2%)	6.458s (~)	0.920s	5	1.00x
🐘 Postgres	Express	29.509s (-9.9% 🟢)	30.154s (-8.8% 🟢)	0.645s	1	5.33x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	3.060s (-32.7% 🟢)	3.813s (-29.0% 🟢)	0.753s	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	0.181s (-3.2%)	0.994s (~)	0.015s (+3.4%)	1.024s (~)	0.843s	10	1.00x
🐘 Postgres	Express	2.231s (+4.1%)	2.814s (-3.0%)	0.000s (~)	3.017s (~)	0.786s	10	12.31x

▲ Production (Vercel)

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	2.872s (-5.9% 🟢)	3.217s (~)	0.122s (-85.9% 🟢)	3.790s (-18.6% 🟢)	0.919s	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

vercel · 2026-01-27T18:18:56Z

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 2, 2026 10:05pm
example-nextjs-workflow-webpack	Ready	Preview, Comment, Open in v0	Feb 2, 2026 10:05pm
example-workflow	Ready	Preview, Comment, Open in v0	Feb 2, 2026 10:05pm
workbench-astro-workflow	Ready	Preview, Comment, Open in v0	Feb 2, 2026 10:05pm
workbench-express-workflow	Ready	Preview, Comment, Open in v0	Feb 2, 2026 10:05pm
workbench-fastify-workflow	Ready	Preview, Comment, Open in v0	Feb 2, 2026 10:05pm
workbench-hono-workflow	Ready	Preview, Comment, Open in v0	Feb 2, 2026 10:05pm
workbench-nitro-workflow	Ready	Preview, Comment, Open in v0	Feb 2, 2026 10:05pm
workbench-nuxt-workflow	Ready	Preview, Comment, Open in v0	Feb 2, 2026 10:05pm
workbench-sveltekit-workflow	Ready	Preview, Comment, Open in v0	Feb 2, 2026 10:05pm
workbench-vite-workflow	Ready	Preview, Comment, Open in v0	Feb 2, 2026 10:05pm
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workflow-nest	Ready	Preview, Comment, Open in v0	Feb 2, 2026 10:05pm

TooTallNate · 2026-01-27T18:19:11Z

Add optional writeToStreamMulti function to the World interface #867 👈 (View in Graphite)
main

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packages/world-vercel/src/utils.ts

packages/core/src/serialization.ts

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TooTallNate merged commit c54ba21 into main Feb 4, 2026
162 of 191 checks passed

TooTallNate deleted the 01-27-add_optional_writetostreammulti_function_to_the_world_interface branch February 4, 2026 01:53

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

Version Packages (beta) #921

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Add optional writeToStreamMulti function to the World interface #867

Add optional writeToStreamMulti function to the World interface #867

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Add optional `writeToStreamMulti` function to the World interface #867

Add optional `writeToStreamMulti` function to the World interface #867

TooTallNate commented Jan 27, 2026 •

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