fix(amplitude-session): recover lastEventTime on partial persist#1198
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fix(amplitude-session): recover lastEventTime on partial persist#1198
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… Fetch iOS Background Fetch can briefly trigger AppState 'active' without user interaction, causing rapid session creation/destruction cycles. Add a 1-second timestamp guard in onForeground() to prevent new sessions from starting within 1 second of the last session creation. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Replace incorrect 1-second timestamp guard with proper root cause fix. The 0-second session bug is caused by non-atomic AsyncStorage persistence: when the app is killed (e.g. during iOS Background Fetch), sessionId may persist while lastEventTime does not. On relaunch, lastEventTime === -1 with a valid sessionId falsely triggers session expiration, ending the just-created session immediately. The fix recovers lastEventTime from sessionId when partial persistence is detected, preventing the false expiration. Also adds hypothesis-driven reproduction tests that verify the fix. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
Fix 0-second sessions in Amplitude Session plugin on iOS when Background Fetch is enabled.
Changes
startNewSessionIfNecessary()for partial AsyncStorage persistencelastEventTimefromsessionIdwhenlastEventTime === -1butsessionId >= 0lastEventTime === -1fromisSessionExpiredcheck (now handled by recovery)onForeground()Why
Plugin persists
sessionIdandlastEventTimevia independent fire-and-forget writes. If app is killed before all writes complete (common during iOS Background Fetch),sessionIdmay persist whilelastEventTimedoesn't. On next launch,lastEventTime === -1with validsessionIdfalsely triggers session expiration, ending the just-created session immediately.🤖 Generated with Claude Code