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… one Completing a sign-in rotates the client token. A request still carrying the old token gets a new, empty client from Frontend API, and if its response won the compare-and-set on the shared device token, the session the sign-in created was no longer reachable. When the JS SDK's rotated token loses the compare-and-set to a token for a different client, it now takes the shared token back. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01YRFX1vXXjueFzAj84qMXJg
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| Check name | Status | Explanation | Resolution |
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Check name Status Explanation Title check The title "fix(expo): keep the signed-in client when a stale token mints another one" describes the main change. The changeset retains the signed-in client when a stale pre-sign-in token mints a new c… Description check The description matches the changeset. It explains the Expo E2E flake ("No session was found with id sess_..."), the root cause (a stale client token rotated during sign-in), and the fix (swapping the… Linked Issues check No active directly linked issue remains. Issue #10397is closed and supplies historical context only. It adds no coding requirement for this pull request.Out of Scope Changes check The changes stay within the stated objective. nativeClientSync.tsdetects a rotated client token and reclaims it with compare-and-set.nativeClientSync.test.tscovers the token-race cases and pres…Full details: Title check
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Explanation
The title "fix(expo): keep the signed-in client when a stale token mints another one" describes the main change. The changeset retains the signed-in client when a stale pre-sign-in token mints a new client, which is the core of the fix in nativeClientSync.ts. The title is specific and uses the conventional commit format. It does not name the compare-and-set recovery step, but that detail is not required.
Full details: Description check
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Explanation
The description matches the changeset. It explains the Expo E2E flake ("No session was found with id sess_..."), the root cause (a stale client token rotated during sign-in), and the fix (swapping the rotated token back in using compare-and-set when the shared token now belongs to a different client). It also lists device test runs that support the change.
Full details: Out of Scope Changes check
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Explanation
The changes stay within the stated objective.
nativeClientSync.tsdetects a rotated client token and reclaims it with compare-and-set.nativeClientSync.test.tscovers the token-race cases and preservation cases. The changeset records the Expo bug fix. No unrelated change is shown.
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Actionable comments posted: 2
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Inline comments:
Review comments at @packages/expo/src/provider/nativeClientSync.ts:
- Line 211: Update the current-token check in the native client sync flow to
require a decoded, non-null client ID before comparing identities or replacing
the token. Keep tokens with unknown client identity unchanged, and preserve the
existing behavior for known, differing client IDs.
- Line 211: Tighten the reclaim condition around clientIdOf and setDeviceToken
so it only replaces the current token when the current value is confirmed to
come from the competing stale request; otherwise preserve the newer native
client’s token. Keep the existing compare-and-set behavior for the initial
update.
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.changeset/expo-keep-rotated-client-token.mdpackages/expo/src/provider/__tests__/nativeClientSync.test.tspackages/expo/src/provider/nativeClientSync.ts
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01YRFX1vXXjueFzAj84qMXJg
Description
Fixes the Expo E2E flake reported twice on the Version packages PR (Slack 1, Slack 2): a launch that signs in with a ticket sometimes ends on
No session was found with id sess_.... It affects every spec that launches signed in, on both platforms. This supersedes the closed #10397 and #10399, which were written without a device run and targeted a different cause.Cause
Completing a sign-in rotates the client token. Frontend API treats a request that still carries the old token as a request from an unknown client and mints a new, empty client for it. I confirmed both against a development instance with curl: the old token gets a new client ID and a new token, and touching the new session with that token returns
resource_not_found.The JS and native SDKs share one device token with compare-and-set. While the ticket sign-in is in flight, either SDK can send another request with the pre-sign-in token, such as native's refresh after JS stored its token, or a JS
GET /v1/clientpull. When that request reaches the server after the rotation and its response is handled first, its compare-and-set (old token→new empty client) succeeds. The sign-in response's compare-and-set (old token→rotated token) then fails.finalize()touches the new session with the empty client's token and gets a 404.The app logs of a run with request logging (an uncommitted patch) show both orders: native replacing the token in one launch, and a JS pull doing it in another.
Fix
The client token is a JWT whose payload names its client. When
saveClientToken's compare-and-set fails, the JS SDK now checks whether:Only a request that used the rotated-away token can produce that state, so the SDK swaps its rotated token back in, still with compare-and-set against the current value. Native then resets to the signed-in client the same way it does for any device token change.
It leaves the native token in place when the late response is the one that minted a new client, when native holds a newer token for the same client, and when a token isn't a client JWT. A native sign-out deletes the token and mints its client from no token, so it never matches the rule.
Device runs
All runs used the
verify-clerk-exporemote devices, the four ticket specs (native-js-sync/sign-out-from-native,token-cache-persistence/relaunch,user-button-and-profile/embedded-profile,user-button-and-profile/profile), and--retries 0.main(63847a9) with request loggingNo session was foundThe before run is not attached:
attachrefuses runs with uncommitted changes, and the logging patch made the failing run one. A before run on a cleanmainneeds a separate before branch.Checklist
pnpm testruns as expected.pnpm buildruns as expected.Type of change
Generated by Claude Code
Verified on an iOS simulator, as reported by the session that
mikepitrestarted. Runr20261023-220621-e195oniPhone 17 Pro on blacksmith-6vcpu-macos-26at39b8465d8ef6, 6 of 6 passed.before-sign-outrestored-home-after-relaunchVerified on an Android emulator, as reported by the session that
mikepitrestarted. Runr20261023-215516-412conClerk_Verify_Pixel on blacksmith-8vcpu-ubuntu-2204at39b8465d8ef6, 6 of 6 passed.before-sign-outrestored-home-after-relaunch