Generate runId client-side in start() and simplify streaming types#954
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TooTallNate merged 1 commit intomainfrom Feb 8, 2026
Merged
Generate runId client-side in start() and simplify streaming types#954TooTallNate merged 1 commit intomainfrom
runId client-side in start() and simplify streaming types#954TooTallNate merged 1 commit intomainfrom
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🦋 Changeset detectedLatest commit: c9082c5 The changes in this PR will be included in the next version bump. This PR includes changesets to release 18 packages
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📊 Benchmark Results
workflow with no steps💻 Local Development
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🔍 Observability: Nitro | Express | Next.js (Turbopack) Promise.all with 10 concurrent steps💻 Local Development
▲ Production (Vercel)
🔍 Observability: Nitro | Express | Next.js (Turbopack) Promise.all with 25 concurrent steps💻 Local Development
▲ Production (Vercel)
🔍 Observability: Express | Nitro | Next.js (Turbopack) Promise.all with 50 concurrent steps💻 Local Development
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🔍 Observability: Nitro | Next.js (Turbopack) | Express Promise.race with 10 concurrent steps💻 Local Development
▲ Production (Vercel)
🔍 Observability: Nitro | Express | Next.js (Turbopack) Promise.race with 25 concurrent steps💻 Local Development
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🔍 Observability: Express | Nitro | Next.js (Turbopack) Promise.race with 50 concurrent steps💻 Local Development
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🔍 Observability: Express | Nitro | Next.js (Turbopack) SummaryFastest Framework by WorldWinner determined by most benchmark wins
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🧪 E2E Test Results❌ Some tests failed Summary
❌ Failed Tests🌍 Community Worlds (163 failed)mongodb (40 failed):
redis (40 failed):
starter (42 failed):
turso (41 failed):
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Pull request overview
This pull request implements client-side runId generation as a prerequisite for the planned E2E encryption feature. It generates workflow run IDs using ULID (wrun_${ulid()}) in the start() function before serialization, eliminating the need for the deferred Promise<string> pattern that was previously used when runIds were server-generated.
Changes:
- Generates runId client-side in
start()using monotonic ULID factory before serialization - Simplifies runId types from
string | Promise<string>tostringthroughout the serialization layer - Updates Storage.events.create() interface to accept
string | nullfor the first overload (previously justnull)
Reviewed changes
Copilot reviewed 10 out of 10 changed files in this pull request and generated no comments.
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| File | Description |
|---|---|
| packages/core/src/runtime/start.ts | Adds client-side runId generation using ULID and verification that server accepted it; removes withResolvers pattern |
| packages/core/src/serialization.ts | Simplifies runId parameter types from string | Promise<string> to string in all dehydrate/hydrate functions and stream classes |
| packages/core/src/runtime/start.test.ts | Updates mock to return client-provided runId and expects wrun_ prefix instead of null |
| packages/core/src/writable-stream.test.ts | Removes tests for Promise-based runId handling; updates error messages |
| packages/world/src/interfaces.ts | Updates Streamer methods and Storage.events.create() signature to use plain string runId |
| packages/world/src/events.ts | Updates comment for RunCreatedEventRequest |
| packages/world-vercel/src/events.ts | Updates comment to reflect client-provided runId support |
| packages/world-postgres/src/storage.ts | Updates comment to reflect client-provided runId support |
| packages/world-local/src/storage/events-storage.ts | Updates comment to reflect client-provided runId support |
| .opencode/plans/e2e-encryption-plan.md | Adds comprehensive E2E encryption implementation plan that relies on client-side runId generation |
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Summary
runIdclient-side instart()using ULID (wrun_${ulid()}), instead of deferring to the serverrunIdtoevents.create()and verifies the server accepted itrunIdtypes fromstring | Promise<string>tostringthroughout the serialization layerwithResolvers<string>()/ deferred runId pattern that was needed whenrunIdwas server-generatedStreamerinterface andWorkflowServerWritableStreamto use plainstringrunIdStorage.events.create()first overload to acceptstring | nullinstead of justnullThis is a prerequisite for E2E encryption, where we need the
runIdbefore serialization so it can be used as part of the encryption context.Test plan
All existing tests pass. Updated
start.test.tsto expect client-generated runId, removedwritable-stream.test.tspromise runId test (no longer applicable).