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feat(ai-client): back off reconnects and retry temporary HTTP statuses - #1881
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ReconnectOptions gets initialDelayMs, maxDelayMs, and budgetMs. The reconnect wait doubles with jitter, and a reconnect answered 408, 429, 502, 503, or 504 is retried, with Retry-After as the wait. The first wait stays 250 ms and the limit stays 5 attempts unless a budget is set.
🦋 Changeset detectedLatest commit: 737cc72 The changes in this PR will be included in the next version bump. This PR includes changesets to release 10 packages
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage |  |
Docstring coverage is 54.55% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 11 functions across 6 files. (3 skipped: … | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Title check The title clearly and concisely summarizes the main changes: reconnect backoff and retries for temporary HTTP statuses. Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request. Description check The pull request description follows the required template. It explains the changes, documents testing status, identifies documentation and changeset updates, and states release impact. The unchecked … Full details: Description check
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Explanation
The pull request description follows the required template. It explains the changes, documents testing status, identifies documentation and changeset updates, and states release impact. The unchecked test:pr item is clearly explained because CI will run it.
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Full details: Docstring Coverage
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Explanation
Docstring coverage is 54.55% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 11 functions across 6 files. (3 skipped: 3 unsupported.)
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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Review comments at @packages/ai-client/src/connection-adapters.ts:
- Around line 302-305: Update the backoff calculation in the reconnect retry
flow to handle reconnect.initialDelayMs being zero before exponentiation,
returning a zero delay in that case. Preserve the existing capped exponential
backoff for nonzero initial delays.
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📒 Files selected for processing: 9
.changeset/client-reconnect-backoff.mddocs/resumable-streams/advanced.mddocs/resumable-streams/websockets.mdpackages/ai-client/src/connection-adapters.tspackages/ai-client/tests/connection-adapters-reconnect-backoff.test.tspackages/ai-client/tests/connection-adapters-resumable-transports.test.tspackages/ai-client/tests/connection-adapters-resumable.test.tspackages/ai-client/tests/connection-adapters-xhr.test.tspackages/ai-client/tests/fetch-json.test.ts
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…est mocks - With initialDelayMs 0, try 1025 computed 0 * 2 ** 1024, which is NaN. A NaN delay never reached budgetMs, so the retries did not stop. A 0 start delay now stays 0. A new test runs 1100 tries, then checks that the budget stops the next one. - Three HTTP error tests mocked a response with no headers. The error path now reads Retry-After, so the mocks get an empty Headers.
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Coverage✅ Coverage held across 9 compared package(s). Each package is measured twice in this job — on this PR and on its merge-base with
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A stream reconnect can now ride out a server restart. Reconnect waits grow after each failed try, a time budget can replace the try limit, and a reconnect that gets 408, 429, 502, 503, or 504 tries again instead of failing at once.
🎯 Changes
ReconnectOptions:initialDelayMs(default 250),maxDelayMs(default 5000), andbudgetMs. The wait doubles after each reconnect that delivers nothing. Jitter picks a wait between half and the full value.maxAttempts, there is no try limit, only the budget.fetchJsonpolls.Retry-Aftersets the wait, capped atmaxDelayMs.delayMsstill works as the old name ofinitialDelayMs, and is marked@deprecated.initialDelayMs: 0, the wait stays 0 on every try. Before, try 1025 computed0 * 2 ** 1024, which isNaN, and aNaNwait never reachedbudgetMs.docs/resumable-streams/advanced.md,docs/resumable-streams/websockets.md. Changeset:client-reconnect-backoff.This came from an app that builds on TanStack AI (item A19 on its findings list). Out of scope here: reconnect on
onlineorvisibilitychange, and a'reconnecting'status.✅ Checklist
pnpm run test:pr, or these tests do not apply to this pull request.docs/for this change, or this change is not user-facing.pnpm changeset), or this PR does not change a published package.🚀 Release Impact
Testing
Commands run. The new
tests/connection-adapters-reconnect-backoff.test.ts(fake timers) and the changed resumable, transports, XHR, andfetch-jsontests pass (81 tests), plus 30 chat-client resume tests. One old test expected a 503 to fail at once. It now uses a 401. The error path now readsRetry-After, so three HTTP error tests inconnection-adapters.test.tsgive their mock an emptyHeaders. The full@tanstack/ai-clientsuite passes (68 files, 1013 tests), and the new 0-delay budget test fails on the old code.test:typesandtest:oxlintpass for@tanstack/ai-client. Not run locally:pnpm test:prand E2E. CI runs them.Manual test.
pnpm --dir packages/ai-client exec vitest run tests/connection-adapters-reconnect-backoff.test.ts.fetchServerSentEvents('/api/chat', { reconnect: { budgetMs: 120_000 } })and restart the server during a stream. The stream continues after the server is back.How this PR makes testing easy. The new backoff test file.
Risk / rollback
Medium-low. With the defaults, a run that keeps failing takes longer to give up (about 7.75 s, not 1.25 s), and temporary statuses now try again. To undo, revert the PR.
Public API change
Before
After
Summary by CodeRabbit
Retry-Afterresponses are respected.