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fix: preserve error name through the serialization pipeline for proper error rehydration - #1504

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fix: preserve error name through the serialization pipeline for proper error rehydration#1504
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WorkflowNotRegisteredError and StepNotRegisteredError were introduced in #1452 but the serialization pipeline only stored message/stack — dropping the class name. Rehydrated errors were always plain Error instances, making .is() checks silently fail.

Changes

  • @workflow/world — Added name?: string to StructuredErrorSchema
  • @workflow/core (runtime) — Include name in run_failed event error objects
  • @workflow/core (step-handler) — Store StepNotRegisteredError as { message, name } object in step_failed events (was a plain string)
  • @workflow/core (step) — Extract name from step_failed error object and set it on the rejected FatalError, so .is() checks work inside workflow catch blocks
  • @workflow/errors — WorkflowRunFailedError now sets causeError.name from StructuredError.name, enabling WorkflowNotRegisteredError.is(err.cause)
  • @workflow/world-local, @workflow/world-postgres, @workflow/world-vercel — Preserve name when mapping failure events → StructuredError / JSON serialization round-trips

After this change:

try{awaitmyStep();}catch(e){if(StepNotRegisteredError.is(e)){// now reachable — e.name === 'StepNotRegisteredError'}}// and for run-level errors:if(WorkflowRunFailedError.is(err)){WorkflowNotRegisteredError.is(err.cause);// true}

How did you test your changes?

  • Updated step-handler.test.ts assertions to match the new structured error object format for StepNotRegisteredError events
  • Added a unit test in step.test.ts verifying that error.name is preserved from step_failed event data
  • All 494 unit tests pass across @workflow/core, @workflow/world-local, and @workflow/world-vercel

PR Checklist - Required to merge

  • 📦 pnpm changeset was run to create a changelog for this PR
    • During beta, we only use "patch" mode for changes. Don't tag minor/major versions.
    • Use pnpm changeset --empty if you are changing documentation or workbench apps
  • 🔒 DCO sign-off passes (run git commit --signoff on your commits)
  • 📝 Ping @vercel/workflow in a comment once the PR is ready, and the above checklist is complete

View original Slack conversation

📱 Kick off Copilot coding agent tasks wherever you are with GitHub Mobile, available on iOS and Android.

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🦋 Changeset detected

Latest commit: a784114

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

This PR includes changesets to release 21 packages
NameType
@workflow/corePatch
@workflow/errorsPatch
@workflow/worldPatch
@workflow/world-localPatch
@workflow/world-vercelPatch
@workflow/world-postgresPatch
@workflow/buildersPatch
@workflow/cliPatch
@workflow/nextPatch
@workflow/nitroPatch
@workflow/vitestPatch
@workflow/web-sharedPatch
workflowPatch
@workflow/world-testingPatch
@workflow/astroPatch
@workflow/nestPatch
@workflow/rollupPatch
@workflow/sveltekitPatch
@workflow/vitePatch
@workflow/nuxtPatch
@workflow/aiPatch

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CopilotAI changed the title [WIP] Add stream pagination and metadata endpointsfix: preserve error name through the serialization pipeline for proper error rehydrationMar 24, 2026
CopilotAI requested a review from pranaygpMarch 24, 2026 17:29
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fix: preserve error name through the serialization pipeline for proper error rehydration by Copilot · Pull Request #1504 · vercel/workflow · GitHub
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fix: preserve error name through the serialization pipeline for proper error rehydration - #1504
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WorkflowNotRegisteredError and StepNotRegisteredError were introduced in #1452 but the serialization pipeline only stored message/stack — dropping the class name. Rehydrated errors were always plain Error instances, making .is() checks silently fail.
Changes
  • @workflow/world — Added name?: string to StructuredErrorSchema
  • @workflow/core (runtime) — Include name in run_failed event error objects
  • @workflow/core (step-handler) — Store StepNotRegisteredError as { message, name } object in step_failed events (was a plain string)
  • @workflow/core (step) — Extract name from step_failed error object and set it on the rejected FatalError, so .is() checks work inside workflow catch blocks
  • @workflow/errors — WorkflowRunFailedError now sets causeError.name from StructuredError.name, enabling WorkflowNotRegisteredError.is(err.cause)
  • @workflow/world-local, @workflow/world-postgres, @workflow/world-vercel — Preserve name when mapping failure events → StructuredError / JSON serialization round-trips
After this change:
try{awaitmyStep();}catch(e){if(StepNotRegisteredError.is(e)){// now reachable — e.name === 'StepNotRegisteredError'}}// and for run-level errors:if(WorkflowRunFailedError.is(err)){WorkflowNotRegisteredError.is(err.cause);// true}
How did you test your changes?
  • Updated step-handler.test.ts assertions to match the new structured error object format for StepNotRegisteredError events
  • Added a unit test in step.test.ts verifying that error.name is preserved from step_failed event data
  • All 494 unit tests pass across @workflow/core, @workflow/world-local, and @workflow/world-vercel
PR Checklist - Required to merge
  •  📦 pnpm changeset was run to create a changelog for this PR

    • During beta, we only use "patch" mode for changes. Don't tag minor/major versions.
    • Use pnpm changeset --empty if you are changing documentation or workbench apps
  •  🔒 DCO sign-off passes (run git commit --signoff on your commits)
  •  📝 Ping @vercel/workflow in a comment once the PR is ready, and the above checklist is complete
View original Slack conversation
📱 Kick off Copilot coding agent tasks wherever you are with GitHub Mobile, available on iOS and Android.
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🦋 Changeset detected
Latest commit: a784114
The changes in this PR will be included in the next version bump.
This PR includes changesets to release 21 packages
NameType
@workflow/corePatch
@workflow/errorsPatch
@workflow/worldPatch
@workflow/world-localPatch
@workflow/world-vercelPatch
@workflow/world-postgresPatch
@workflow/buildersPatch
@workflow/cliPatch
@workflow/nextPatch
@workflow/nitroPatch
@workflow/vitestPatch
@workflow/web-sharedPatch
workflowPatch
@workflow/world-testingPatch
@workflow/astroPatch
@workflow/nestPatch
@workflow/rollupPatch
@workflow/sveltekitPatch
@workflow/vitePatch
@workflow/nuxtPatch
@workflow/aiPatch
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ProjectDeploymentActionsUpdated (UTC)
example-nextjs-workflow-turbopackReadyReadyPreview, CommentMar 24, 2026 5:25pm
example-nextjs-workflow-webpackReadyReadyPreview, CommentMar 24, 2026 5:25pm
example-workflowReadyReadyPreview, CommentMar 24, 2026 5:25pm
workbench-astro-workflowReadyReadyPreview, CommentMar 24, 2026 5:25pm
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CopilotAI
changed the title
[WIP] Add stream pagination and metadata endpointsfix: preserve error name through the serialization pipeline for proper error rehydrationMar 24, 2026
CopilotAI
requested a review
from pranaygpMarch 24, 2026 17:29
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, 'i');
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var style = document.createElement('style');
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fix: preserve error name through the serialization pipeline for proper error rehydration by Copilot · Pull Request #1504 · vercel/workflow · GitHub
Skip to content
fix: preserve error name through the serialization pipeline for proper error rehydration - #1504
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pranaygp with Copilot wants to merge 2 commits into
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fix: preserve error name through the serialization pipeline for proper error rehydration#1504
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WorkflowNotRegisteredError and StepNotRegisteredError were introduced in #1452 but the serialization pipeline only stored message/stack — dropping the class name. Rehydrated errors were always plain Error instances, making .is() checks silently fail.
Changes
  • @workflow/world — Added name?: string to StructuredErrorSchema
  • @workflow/core (runtime) — Include name in run_failed event error objects
  • @workflow/core (step-handler) — Store StepNotRegisteredError as { message, name } object in step_failed events (was a plain string)
  • @workflow/core (step) — Extract name from step_failed error object and set it on the rejected FatalError, so .is() checks work inside workflow catch blocks
  • @workflow/errors — WorkflowRunFailedError now sets causeError.name from StructuredError.name, enabling WorkflowNotRegisteredError.is(err.cause)
  • @workflow/world-local, @workflow/world-postgres, @workflow/world-vercel — Preserve name when mapping failure events → StructuredError / JSON serialization round-trips
After this change:
try{awaitmyStep();}catch(e){if(StepNotRegisteredError.is(e)){// now reachable — e.name === 'StepNotRegisteredError'}}// and for run-level errors:if(WorkflowRunFailedError.is(err)){WorkflowNotRegisteredError.is(err.cause);// true}
How did you test your changes?
  • Updated step-handler.test.ts assertions to match the new structured error object format for StepNotRegisteredError events
  • Added a unit test in step.test.ts verifying that error.name is preserved from step_failed event data
  • All 494 unit tests pass across @workflow/core, @workflow/world-local, and @workflow/world-vercel
PR Checklist - Required to merge
  •  📦 pnpm changeset was run to create a changelog for this PR

    • During beta, we only use "patch" mode for changes. Don't tag minor/major versions.
    • Use pnpm changeset --empty if you are changing documentation or workbench apps
  •  🔒 DCO sign-off passes (run git commit --signoff on your commits)
  •  📝 Ping @vercel/workflow in a comment once the PR is ready, and the above checklist is complete
View original Slack conversation
📱 Kick off Copilot coding agent tasks wherever you are with GitHub Mobile, available on iOS and Android.
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🦋 Changeset detected
Latest commit: a784114
The changes in this PR will be included in the next version bump.
This PR includes changesets to release 21 packages
NameType
@workflow/corePatch
@workflow/errorsPatch
@workflow/worldPatch
@workflow/world-localPatch
@workflow/world-vercelPatch
@workflow/world-postgresPatch
@workflow/buildersPatch
@workflow/cliPatch
@workflow/nextPatch
@workflow/nitroPatch
@workflow/vitestPatch
@workflow/web-sharedPatch
workflowPatch
@workflow/world-testingPatch
@workflow/astroPatch
@workflow/nestPatch
@workflow/rollupPatch
@workflow/sveltekitPatch
@workflow/vitePatch
@workflow/nuxtPatch
@workflow/aiPatch
Not sure what this means? Click here to learn what changesets are.
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example-nextjs-workflow-turbopackReadyReadyPreview, CommentMar 24, 2026 5:25pm
example-nextjs-workflow-webpackReadyReadyPreview, CommentMar 24, 2026 5:25pm
example-workflowReadyReadyPreview, CommentMar 24, 2026 5:25pm
workbench-astro-workflowReadyReadyPreview, CommentMar 24, 2026 5:25pm
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workbench-vite-workflowReadyReadyPreview, CommentMar 24, 2026 5:25pm
workflow-docsReadyReadyPreview, Comment, Open in v0Mar 24, 2026 5:25pm
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CopilotAI
changed the title
[WIP] Add stream pagination and metadata endpointsfix: preserve error name through the serialization pipeline for proper error rehydrationMar 24, 2026
CopilotAI
requested a review
from pranaygpMarch 24, 2026 17:29
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try {
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fix: preserve error name through the serialization pipeline for proper error rehydration by Copilot · Pull Request #1504 · vercel/workflow · GitHub
Skip to content
fix: preserve error name through the serialization pipeline for proper error rehydration - #1504
Draft
pranaygp with Copilot wants to merge 2 commits into
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fix: preserve error name through the serialization pipeline for proper error rehydration#1504
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WorkflowNotRegisteredError and StepNotRegisteredError were introduced in #1452 but the serialization pipeline only stored message/stack — dropping the class name. Rehydrated errors were always plain Error instances, making .is() checks silently fail.
Changes
  • @workflow/world — Added name?: string to StructuredErrorSchema
  • @workflow/core (runtime) — Include name in run_failed event error objects
  • @workflow/core (step-handler) — Store StepNotRegisteredError as { message, name } object in step_failed events (was a plain string)
  • @workflow/core (step) — Extract name from step_failed error object and set it on the rejected FatalError, so .is() checks work inside workflow catch blocks
  • @workflow/errors — WorkflowRunFailedError now sets causeError.name from StructuredError.name, enabling WorkflowNotRegisteredError.is(err.cause)
  • @workflow/world-local, @workflow/world-postgres, @workflow/world-vercel — Preserve name when mapping failure events → StructuredError / JSON serialization round-trips
After this change:
try{awaitmyStep();}catch(e){if(StepNotRegisteredError.is(e)){// now reachable — e.name === 'StepNotRegisteredError'}}// and for run-level errors:if(WorkflowRunFailedError.is(err)){WorkflowNotRegisteredError.is(err.cause);// true}
How did you test your changes?
  • Updated step-handler.test.ts assertions to match the new structured error object format for StepNotRegisteredError events
  • Added a unit test in step.test.ts verifying that error.name is preserved from step_failed event data
  • All 494 unit tests pass across @workflow/core, @workflow/world-local, and @workflow/world-vercel
PR Checklist - Required to merge
  •  📦 pnpm changeset was run to create a changelog for this PR

    • During beta, we only use "patch" mode for changes. Don't tag minor/major versions.
    • Use pnpm changeset --empty if you are changing documentation or workbench apps
  •  🔒 DCO sign-off passes (run git commit --signoff on your commits)
  •  📝 Ping @vercel/workflow in a comment once the PR is ready, and the above checklist is complete
View original Slack conversation
📱 Kick off Copilot coding agent tasks wherever you are with GitHub Mobile, available on iOS and Android.
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🦋 Changeset detected
Latest commit: a784114
The changes in this PR will be included in the next version bump.
This PR includes changesets to release 21 packages
NameType
@workflow/corePatch
@workflow/errorsPatch
@workflow/worldPatch
@workflow/world-localPatch
@workflow/world-vercelPatch
@workflow/world-postgresPatch
@workflow/buildersPatch
@workflow/cliPatch
@workflow/nextPatch
@workflow/nitroPatch
@workflow/vitestPatch
@workflow/web-sharedPatch
workflowPatch
@workflow/world-testingPatch
@workflow/astroPatch
@workflow/nestPatch
@workflow/rollupPatch
@workflow/sveltekitPatch
@workflow/vitePatch
@workflow/nuxtPatch
@workflow/aiPatch
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
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example-nextjs-workflow-webpackReadyReadyPreview, CommentMar 24, 2026 5:25pm
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CopilotAI
changed the title
[WIP] Add stream pagination and metadata endpointsfix: preserve error name through the serialization pipeline for proper error rehydrationMar 24, 2026
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from pranaygpMarch 24, 2026 17:29
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
fix: preserve error name through the serialization pipeline for proper error rehydration by Copilot · Pull Request #1504 · vercel/workflow · GitHub
Skip to content
fix: preserve error name through the serialization pipeline for proper error rehydration - #1504
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fix: preserve error name through the serialization pipeline for proper error rehydration#1504
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Mar 24, 2026•

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WorkflowNotRegisteredError and StepNotRegisteredError were introduced in #1452 but the serialization pipeline only stored message/stack — dropping the class name. Rehydrated errors were always plain Error instances, making .is() checks silently fail.
Changes
  • @workflow/world — Added name?: string to StructuredErrorSchema
  • @workflow/core (runtime) — Include name in run_failed event error objects
  • @workflow/core (step-handler) — Store StepNotRegisteredError as { message, name } object in step_failed events (was a plain string)
  • @workflow/core (step) — Extract name from step_failed error object and set it on the rejected FatalError, so .is() checks work inside workflow catch blocks
  • @workflow/errors — WorkflowRunFailedError now sets causeError.name from StructuredError.name, enabling WorkflowNotRegisteredError.is(err.cause)
  • @workflow/world-local, @workflow/world-postgres, @workflow/world-vercel — Preserve name when mapping failure events → StructuredError / JSON serialization round-trips
After this change:
try{awaitmyStep();}catch(e){if(StepNotRegisteredError.is(e)){// now reachable — e.name === 'StepNotRegisteredError'}}// and for run-level errors:if(WorkflowRunFailedError.is(err)){WorkflowNotRegisteredError.is(err.cause);// true}
How did you test your changes?
  • Updated step-handler.test.ts assertions to match the new structured error object format for StepNotRegisteredError events
  • Added a unit test in step.test.ts verifying that error.name is preserved from step_failed event data
  • All 494 unit tests pass across @workflow/core, @workflow/world-local, and @workflow/world-vercel
PR Checklist - Required to merge
  •  📦 pnpm changeset was run to create a changelog for this PR

    • During beta, we only use "patch" mode for changes. Don't tag minor/major versions.
    • Use pnpm changeset --empty if you are changing documentation or workbench apps
  •  🔒 DCO sign-off passes (run git commit --signoff on your commits)
  •  📝 Ping @vercel/workflow in a comment once the PR is ready, and the above checklist is complete
View original Slack conversation
📱 Kick off Copilot coding agent tasks wherever you are with GitHub Mobile, available on iOS and Android.
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🦋 Changeset detected
Latest commit: a784114
The changes in this PR will be included in the next version bump.
This PR includes changesets to release 21 packages
NameType
@workflow/corePatch
@workflow/errorsPatch
@workflow/worldPatch
@workflow/world-localPatch
@workflow/world-vercelPatch
@workflow/world-postgresPatch
@workflow/buildersPatch
@workflow/cliPatch
@workflow/nextPatch
@workflow/nitroPatch
@workflow/vitestPatch
@workflow/web-sharedPatch
workflowPatch
@workflow/world-testingPatch
@workflow/astroPatch
@workflow/nestPatch
@workflow/rollupPatch
@workflow/sveltekitPatch
@workflow/vitePatch
@workflow/nuxtPatch
@workflow/aiPatch
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ProjectDeploymentActionsUpdated (UTC)
example-nextjs-workflow-turbopackReadyReadyPreview, CommentMar 24, 2026 5:25pm
example-nextjs-workflow-webpackReadyReadyPreview, CommentMar 24, 2026 5:25pm
example-workflowReadyReadyPreview, CommentMar 24, 2026 5:25pm
workbench-astro-workflowReadyReadyPreview, CommentMar 24, 2026 5:25pm
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workbench-vite-workflowReadyReadyPreview, CommentMar 24, 2026 5:25pm
workflow-docsReadyReadyPreview, Comment, Open in v0Mar 24, 2026 5:25pm
workflow-swc-playgroundReadyReadyPreview, CommentMar 24, 2026 5:25pm
CopilotAI
changed the title
[WIP] Add stream pagination and metadata endpointsfix: preserve error name through the serialization pipeline for proper error rehydrationMar 24, 2026
CopilotAI
requested a review
from pranaygpMarch 24, 2026 17:29
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
fix: preserve error name through the serialization pipeline for proper error rehydration by Copilot · Pull Request #1504 · vercel/workflow · GitHub
Skip to content
fix: preserve error name through the serialization pipeline for proper error rehydration - #1504
Draft
pranaygp with Copilot wants to merge 2 commits into
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copilot/add-stream-pagination-metadata-endpoints
Draft
fix: preserve error name through the serialization pipeline for proper error rehydration#1504
pranaygp with Copilot wants to merge 2 commits into
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copilot/add-stream-pagination-metadata-endpoints
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Mar 24, 2026•

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WorkflowNotRegisteredError and StepNotRegisteredError were introduced in #1452 but the serialization pipeline only stored message/stack — dropping the class name. Rehydrated errors were always plain Error instances, making .is() checks silently fail.
Changes
  • @workflow/world — Added name?: string to StructuredErrorSchema
  • @workflow/core (runtime) — Include name in run_failed event error objects
  • @workflow/core (step-handler) — Store StepNotRegisteredError as { message, name } object in step_failed events (was a plain string)
  • @workflow/core (step) — Extract name from step_failed error object and set it on the rejected FatalError, so .is() checks work inside workflow catch blocks
  • @workflow/errors — WorkflowRunFailedError now sets causeError.name from StructuredError.name, enabling WorkflowNotRegisteredError.is(err.cause)
  • @workflow/world-local, @workflow/world-postgres, @workflow/world-vercel — Preserve name when mapping failure events → StructuredError / JSON serialization round-trips
After this change:
try{awaitmyStep();}catch(e){if(StepNotRegisteredError.is(e)){// now reachable — e.name === 'StepNotRegisteredError'}}// and for run-level errors:if(WorkflowRunFailedError.is(err)){WorkflowNotRegisteredError.is(err.cause);// true}
How did you test your changes?
  • Updated step-handler.test.ts assertions to match the new structured error object format for StepNotRegisteredError events
  • Added a unit test in step.test.ts verifying that error.name is preserved from step_failed event data
  • All 494 unit tests pass across @workflow/core, @workflow/world-local, and @workflow/world-vercel
PR Checklist - Required to merge
  •  📦 pnpm changeset was run to create a changelog for this PR

    • During beta, we only use "patch" mode for changes. Don't tag minor/major versions.
    • Use pnpm changeset --empty if you are changing documentation or workbench apps
  •  🔒 DCO sign-off passes (run git commit --signoff on your commits)
  •  📝 Ping @vercel/workflow in a comment once the PR is ready, and the above checklist is complete
View original Slack conversation
📱 Kick off Copilot coding agent tasks wherever you are with GitHub Mobile, available on iOS and Android.
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🦋 Changeset detected
Latest commit: a784114
The changes in this PR will be included in the next version bump.
This PR includes changesets to release 21 packages
NameType
@workflow/corePatch
@workflow/errorsPatch
@workflow/worldPatch
@workflow/world-localPatch
@workflow/world-vercelPatch
@workflow/world-postgresPatch
@workflow/buildersPatch
@workflow/cliPatch
@workflow/nextPatch
@workflow/nitroPatch
@workflow/vitestPatch
@workflow/web-sharedPatch
workflowPatch
@workflow/world-testingPatch
@workflow/astroPatch
@workflow/nestPatch
@workflow/rollupPatch
@workflow/sveltekitPatch
@workflow/vitePatch
@workflow/nuxtPatch
@workflow/aiPatch
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
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ProjectDeploymentActionsUpdated (UTC)
example-nextjs-workflow-turbopackReadyReadyPreview, CommentMar 24, 2026 5:25pm
example-nextjs-workflow-webpackReadyReadyPreview, CommentMar 24, 2026 5:25pm
example-workflowReadyReadyPreview, CommentMar 24, 2026 5:25pm
workbench-astro-workflowReadyReadyPreview, CommentMar 24, 2026 5:25pm
workbench-express-workflowReadyReadyPreview, CommentMar 24, 2026 5:25pm
workbench-fastify-workflowReadyReadyPreview, CommentMar 24, 2026 5:25pm
workbench-hono-workflowReadyReadyPreview, CommentMar 24, 2026 5:25pm
workbench-nitro-workflowReadyReadyPreview, CommentMar 24, 2026 5:25pm
workbench-nuxt-workflowReadyReadyPreview, CommentMar 24, 2026 5:25pm
workbench-sveltekit-workflowReadyReadyPreview, CommentMar 24, 2026 5:25pm
workbench-vite-workflowReadyReadyPreview, CommentMar 24, 2026 5:25pm
workflow-docsReadyReadyPreview, Comment, Open in v0Mar 24, 2026 5:25pm
workflow-swc-playgroundReadyReadyPreview, CommentMar 24, 2026 5:25pm
CopilotAI
changed the title
[WIP] Add stream pagination and metadata endpointsfix: preserve error name through the serialization pipeline for proper error rehydrationMar 24, 2026
CopilotAI
requested a review
from pranaygpMarch 24, 2026 17:29
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
}
unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
fix: preserve error name through the serialization pipeline for proper error rehydration by Copilot · Pull Request #1504 · vercel/workflow · GitHub
Skip to content
fix: preserve error name through the serialization pipeline for proper error rehydration - #1504
Draft
pranaygp with Copilot wants to merge 2 commits into
mainfrom 
copilot/add-stream-pagination-metadata-endpoints
Draft
fix: preserve error name through the serialization pipeline for proper error rehydration#1504
pranaygp with Copilot wants to merge 2 commits into
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copilot/add-stream-pagination-metadata-endpoints
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commented
Mar 24, 2026•

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WorkflowNotRegisteredError and StepNotRegisteredError were introduced in #1452 but the serialization pipeline only stored message/stack — dropping the class name. Rehydrated errors were always plain Error instances, making .is() checks silently fail.
Changes
  • @workflow/world — Added name?: string to StructuredErrorSchema
  • @workflow/core (runtime) — Include name in run_failed event error objects
  • @workflow/core (step-handler) — Store StepNotRegisteredError as { message, name } object in step_failed events (was a plain string)
  • @workflow/core (step) — Extract name from step_failed error object and set it on the rejected FatalError, so .is() checks work inside workflow catch blocks
  • @workflow/errors — WorkflowRunFailedError now sets causeError.name from StructuredError.name, enabling WorkflowNotRegisteredError.is(err.cause)
  • @workflow/world-local, @workflow/world-postgres, @workflow/world-vercel — Preserve name when mapping failure events → StructuredError / JSON serialization round-trips
After this change:
try{awaitmyStep();}catch(e){if(StepNotRegisteredError.is(e)){// now reachable — e.name === 'StepNotRegisteredError'}}// and for run-level errors:if(WorkflowRunFailedError.is(err)){WorkflowNotRegisteredError.is(err.cause);// true}
How did you test your changes?
  • Updated step-handler.test.ts assertions to match the new structured error object format for StepNotRegisteredError events
  • Added a unit test in step.test.ts verifying that error.name is preserved from step_failed event data
  • All 494 unit tests pass across @workflow/core, @workflow/world-local, and @workflow/world-vercel
PR Checklist - Required to merge
  •  📦 pnpm changeset was run to create a changelog for this PR

    • During beta, we only use "patch" mode for changes. Don't tag minor/major versions.
    • Use pnpm changeset --empty if you are changing documentation or workbench apps
  •  🔒 DCO sign-off passes (run git commit --signoff on your commits)
  •  📝 Ping @vercel/workflow in a comment once the PR is ready, and the above checklist is complete
View original Slack conversation
📱 Kick off Copilot coding agent tasks wherever you are with GitHub Mobile, available on iOS and Android.
@changeset-bot
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commented
Mar 24, 2026•

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🦋 Changeset detected
Latest commit: a784114
The changes in this PR will be included in the next version bump.
This PR includes changesets to release 21 packages
NameType
@workflow/corePatch
@workflow/errorsPatch
@workflow/worldPatch
@workflow/world-localPatch
@workflow/world-vercelPatch
@workflow/world-postgresPatch
@workflow/buildersPatch
@workflow/cliPatch
@workflow/nextPatch
@workflow/nitroPatch
@workflow/vitestPatch
@workflow/web-sharedPatch
workflowPatch
@workflow/world-testingPatch
@workflow/astroPatch
@workflow/nestPatch
@workflow/rollupPatch
@workflow/sveltekitPatch
@workflow/vitePatch
@workflow/nuxtPatch
@workflow/aiPatch
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
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ProjectDeploymentActionsUpdated (UTC)
example-nextjs-workflow-turbopackReadyReadyPreview, CommentMar 24, 2026 5:25pm
example-nextjs-workflow-webpackReadyReadyPreview, CommentMar 24, 2026 5:25pm
example-workflowReadyReadyPreview, CommentMar 24, 2026 5:25pm
workbench-astro-workflowReadyReadyPreview, CommentMar 24, 2026 5:25pm
workbench-express-workflowReadyReadyPreview, CommentMar 24, 2026 5:25pm
workbench-fastify-workflowReadyReadyPreview, CommentMar 24, 2026 5:25pm
workbench-hono-workflowReadyReadyPreview, CommentMar 24, 2026 5:25pm
workbench-nitro-workflowReadyReadyPreview, CommentMar 24, 2026 5:25pm
workbench-nuxt-workflowReadyReadyPreview, CommentMar 24, 2026 5:25pm
workbench-sveltekit-workflowReadyReadyPreview, CommentMar 24, 2026 5:25pm
workbench-vite-workflowReadyReadyPreview, CommentMar 24, 2026 5:25pm
workflow-docsReadyReadyPreview, Comment, Open in v0Mar 24, 2026 5:25pm
workflow-swc-playgroundReadyReadyPreview, CommentMar 24, 2026 5:25pm
CopilotAI
changed the title
[WIP] Add stream pagination and metadata endpointsfix: preserve error name through the serialization pipeline for proper error rehydrationMar 24, 2026
CopilotAI
requested a review
from pranaygpMarch 24, 2026 17:29
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
(function() {
var enabled = true;
function applyDarkMode() {
if (!enabled) return;
// Create style element if it doesn't exist
var style = document.getElementById('universal-dark-mode-style');
if (!style) {
style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
// Dark mode CSS - inverts colors but preserves images/video
style.textContent = '
/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
filter: invert(1) hue-rotate(180deg) !important;
}
/* Preserve specific elements that should not be inverted */
.no-dark-mode, .no-dark-mode *,
[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
/* Scrollbars */
::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
}
// Toggle with Alt+Shift+D
document.addEventListener('keydown', function(e) {
if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
if (enabled) {
applyDarkMode();
console.log('[Universal Dark Mode] Enabled');
} else {
removeDarkMode();
console.log('[Universal Dark Mode] Disabled');
}
}
});
// Apply on load
applyDarkMode();
// Re-apply on dynamic content
var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();
fix: preserve error name through the serialization pipeline for proper error rehydration by Copilot · Pull Request #1504 · vercel/workflow · GitHub
Skip to content
fix: preserve error name through the serialization pipeline for proper error rehydration - #1504
Draft
pranaygp with Copilot wants to merge 2 commits into
mainfrom 
copilot/add-stream-pagination-metadata-endpoints
Draft
fix: preserve error name through the serialization pipeline for proper error rehydration#1504
pranaygp with Copilot wants to merge 2 commits into
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copilot/add-stream-pagination-metadata-endpoints
Conversation
CopilotAI
commented
Mar 24, 2026•

edited

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WorkflowNotRegisteredError and StepNotRegisteredError were introduced in #1452 but the serialization pipeline only stored message/stack — dropping the class name. Rehydrated errors were always plain Error instances, making .is() checks silently fail.
Changes
  • @workflow/world — Added name?: string to StructuredErrorSchema
  • @workflow/core (runtime) — Include name in run_failed event error objects
  • @workflow/core (step-handler) — Store StepNotRegisteredError as { message, name } object in step_failed events (was a plain string)
  • @workflow/core (step) — Extract name from step_failed error object and set it on the rejected FatalError, so .is() checks work inside workflow catch blocks
  • @workflow/errors — WorkflowRunFailedError now sets causeError.name from StructuredError.name, enabling WorkflowNotRegisteredError.is(err.cause)
  • @workflow/world-local, @workflow/world-postgres, @workflow/world-vercel — Preserve name when mapping failure events → StructuredError / JSON serialization round-trips
After this change:
try{awaitmyStep();}catch(e){if(StepNotRegisteredError.is(e)){// now reachable — e.name === 'StepNotRegisteredError'}}// and for run-level errors:if(WorkflowRunFailedError.is(err)){WorkflowNotRegisteredError.is(err.cause);// true}
How did you test your changes?
  • Updated step-handler.test.ts assertions to match the new structured error object format for StepNotRegisteredError events
  • Added a unit test in step.test.ts verifying that error.name is preserved from step_failed event data
  • All 494 unit tests pass across @workflow/core, @workflow/world-local, and @workflow/world-vercel
PR Checklist - Required to merge
  •  📦 pnpm changeset was run to create a changelog for this PR

    • During beta, we only use "patch" mode for changes. Don't tag minor/major versions.
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🦋 Changeset detected
Latest commit: a784114
The changes in this PR will be included in the next version bump.
This PR includes changesets to release 21 packages
NameType
@workflow/corePatch
@workflow/errorsPatch
@workflow/worldPatch
@workflow/world-localPatch
@workflow/world-vercelPatch
@workflow/world-postgresPatch
@workflow/buildersPatch
@workflow/cliPatch
@workflow/nextPatch
@workflow/nitroPatch
@workflow/vitestPatch
@workflow/web-sharedPatch
workflowPatch
@workflow/world-testingPatch
@workflow/astroPatch
@workflow/nestPatch
@workflow/rollupPatch
@workflow/sveltekitPatch
@workflow/vitePatch
@workflow/nuxtPatch
@workflow/aiPatch
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example-nextjs-workflow-turbopackReadyReadyPreview, CommentMar 24, 2026 5:25pm
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CopilotAI
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[WIP] Add stream pagination and metadata endpointsfix: preserve error name through the serialization pipeline for proper error rehydrationMar 24, 2026
CopilotAI
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from pranaygpMarch 24, 2026 17:29
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