feat: Add flexible matching strategies for electric-db-collection (#402) #499
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- Add three matching strategies for client-server synchronization: 1. Txid strategy (existing, backward compatible) 2. Custom match function strategy (new) 3. Void/timeout strategy (new, 3-second default) - New types: MatchFunction<T>, MatchingStrategy<T> - Enhanced ElectricCollectionConfig to support all strategies - New utility: awaitMatch(matchFn, timeout?) - Export isChangeMessage and isControlMessage helpers - Remove deprecated error classes (beta compatibility not required) - Comprehensive tests for all strategies including timeout behavior - Updated documentation with detailed examples and migration guide Benefits: - Backward compatibility maintained - Architecture flexibility for different backend capabilities - Progressive enhancement path - No forced backend API changes 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <[email protected]>
🦋 Changeset detectedLatest commit: 89e7cce The changes in this PR will be included in the next version bump. This PR includes changesets to release 3 packages
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@tanstack/angular-db
@tanstack/db
@tanstack/db-ivm
@tanstack/electric-db-collection
@tanstack/query-db-collection
@tanstack/react-db
@tanstack/rxdb-db-collection
@tanstack/solid-db
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@tanstack/trailbase-db-collection
@tanstack/vue-db
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Size Change: +14 B (+0.02%) Total Size: 75.2 kB
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…nd API consistency
Critical fixes based on thorough code review:
**🔧 Commit Semantics Fix:**
- awaitMatch now waits for up-to-date after finding match (like awaitTxId)
- Ensures consistent behavior between txid and custom match strategies
- Prevents race conditions where mutations marked "persisted" before actual commit
**🧠 Memory Leak Fixes:**
- Properly cleanup pendingMatches on timeout and abort
- Add abort listener to cleanup all pending matches on stream abort
- Use cross-platform ReturnType<typeof setTimeout> instead of NodeJS.Timeout
**🎯 API Consistency:**
- Unified MatchingStrategy type used across all handler return types
- Support configurable timeout for void strategy: { timeout: 1500 }
- Remove unused discriminator type field for cleaner duck-typed unions
**🧪 Enhanced Test Coverage:**
- Test memory cleanup after timeout (no lingering handlers)
- Test commit semantics (awaitMatch waits for up-to-date)
- Test configurable void timeout functionality
- All edge cases now properly covered
**📦 Version Bump:**
- Changeset updated to minor (removed exported error classes)
All feedback addressed while maintaining backward compatibility.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <[email protected]>
Based on engineering feedback, this commit addresses several critical edge cases: **Memory Safety & Error Handling:** - Fix timeout cleanup memory leak in awaitMatch - pending matchers now properly removed on timeout - Add try/catch around matchFn calls to prevent user code from crashing stream loop - Add proper abort semantics with StreamAbortedError for pending matches - Add TimeoutWaitingForMatchError following codebase error class conventions **Race Condition Fix:** - Implement up-to-date bounded message buffer to handle race where messages arrive before matcher registration - Buffer is safely bounded to current transaction batch, eliminating stale data matching risks - Messages cleared on each up-to-date to maintain transaction boundaries **Test Reliability:** - Replace timing-based assertions with fake timers using vi.runOnlyPendingTimersAsync() - Eliminates CI flakiness while testing the same void strategy functionality **Cross-platform Compatibility:** - Confirmed ReturnType<typeof setTimeout> usage for browser compatibility - API shape consistency already matches runtime behavior The core matching strategy design (txid/custom/void) remains unchanged - these are lifecycle polish fixes for production readiness. 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <[email protected]>
Resolved merge conflicts in electric.ts by combining: - Custom match function support from match-stream branch - Snapshot support from origin/main Both features are now integrated together. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
The interface was extending BaseCollectionConfig with a strict handler
return type of { txid: ... }, but our new matching strategies support
broader return types including matchFn and void strategies.
Removed the extends constraint and manually included needed properties
to allow handlers to return any MatchingStrategy type.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <[email protected]>
kevin-dp
reviewed
Oct 7, 2025
| */ | ||
| id?: string | ||
| schema?: TSchema | ||
| getKey: CollectionConfig<T, string | number, TSchema>[`getKey`] |
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Most of these properties and methods (getKey, onInsert, etc.) are defined in the BaseCollectionConfig. Please do not introduce them here but extend the BaseCollectionConfig class as it used to do and only add Electric-specific things that are not part of the base config.
There was a problem hiding this comment.
This PR originally predates the refactor when BaseCollectionConfig was introduced - all these props were here and modified in the first commit to this PR. I think Claude has not caught that context when addressing the merge conflict when merging in main.
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Summary
Implements GitHub issue #402 by adding flexible matching strategies for electric-db-collection synchronization.
• Txid Strategy (existing, backward compatible) - Uses PostgreSQL transaction IDs for precise matching
• Custom Match Function Strategy (new) - Allows heuristic-based matching with custom logic
• Void/Timeout Strategy (new, 3-second default) - Simple timeout for prototyping
Key Features
MatchFunction<T>,MatchingStrategy<T>ElectricCollectionConfigto support all strategiesawaitMatch(matchFn, timeout?)isChangeMessageandisControlMessagehelpers for custom match functionsBenefits
Test plan
🤖 Generated with Claude Code