fix(ai): reject non-streaming chat on run errors - #938
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AlemTuzlak merged 2 commits intoAug 21, 2026
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: defaults Review profile: CHILL Plan: Pro Plus Run ID: 📒 Files selected for processing (8)
🚧 Files skipped from review as they are similar to previous changes (8)
Included review availability: Your plan provides up to 8 included reviews per hour; 7 remain after this review. 📝 WalkthroughWalkthroughThe PR centralizes ChangesRUN_ERROR propagation
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to This localized change makes non-streaming requests reject with provider run errors while preserving error details; no actionable merge-blocking risk remains after normal checks and review. Sequence Diagram(s)sequenceDiagram
participant E2ETest
participant NonStreamingRunErrorRoute
participant OpenAIChatAdapter
E2ETest->>NonStreamingRunErrorRoute: POST /api/non-streaming-run-error
NonStreamingRunErrorRoute->>OpenAIChatAdapter: Invoke non-streaming chat
OpenAIChatAdapter-->>NonStreamingRunErrorRoute: Return 429 RUN_ERROR
NonStreamingRunErrorRoute-->>E2ETest: Return rejection message and code
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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why is this in draft? |
jan-kubica
marked this pull request as ready for review
August 20, 2026 15:09
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@AlemTuzlak I was limited by the repository rules, which allows only 5 PRs opened at the same time, opening as a draft was a workaround. Flipping to "ready" |
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Inline comments:
In `@packages/ai/tests/stream-to-response.test.ts`:
- Line 3: Move the unit test importing and exercising streamToText from the
package-level tests directory into a .test.ts file alongside
stream-to-response.ts, preserving its existing assertions and behavior.
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📒 Files selected for processing (8)
.changeset/calm-lions-throw.mdpackages/ai/src/activities/chat/stream/processor.tspackages/ai/src/stream-to-response.tspackages/ai/src/utilities/errors.tspackages/ai/tests/stream-to-response.test.tstesting/e2e/src/routeTree.gen.tstesting/e2e/src/routes/api.non-streaming-run-error.tstesting/e2e/tests/non-streaming-run-error.spec.ts
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Thanks for the PR, @jan-kubica! 🙌 @tombeckenham will take a look. Automated pre-review checks
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Maintainer sweep: rebased onto |
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AlemTuzlak
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Aug 21, 2026
# Conflicts: # testing/e2e/src/routeTree.gen.ts
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chat({ stream: false })used to return partial text after a providerRUN_ERROR. It now rejects with the same error as the streaming path.🎯 Changes
streamToTextthrows when the event stream emitsRUN_ERROR.StreamProcessorandstreamToTextsharerunErrorEventToError, so the consumerErrorkeepscodeandrawEvent.mainafter fix: recover text from completed Responses events #937. The only conflict was generatedtesting/e2e/src/routeTree.gen.ts. Both E2E routes stay.✅ Checklist
pnpm run test:pr.docs/for this change, or this change is not user-facing.pnpm changeset), or this PR does not change a published package.This is user-facing behavior, but there is no existing docs page for the non-streaming error path. The changeset is the user-visible note. I did not add a new docs page in this conflict rebase.
🚀 Release Impact
Testing
Commands run
pnpm --filter @tanstack/ai exec vitest run tests/stream-to-response.test.ts— 30 passedpnpm --filter @tanstack/ai test:types— passed after a workspace buildpnpm --filter @tanstack/ai test:oxlint— 0 errorspnpm test:prand the E2E spec in this pass (conflict was generated route tree only)Manual test
chat({ stream: false })against a provider that returns HTTP 429.error.messageanderror.codematch the provider.How this PR makes testing easy
packages/ai/tests/stream-to-response.test.tsrejects onRUN_ERRORtesting/e2e/tests/non-streaming-run-error.spec.tshits a mocked 429Risk / rollback
Low. Revert the PR. Streaming
onErrorbehavior does not change.Public API change
Before
After
Summary by CodeRabbit
Bug Fixes
Tests