SyncGuardDistributed locks that feel like local locks

One `await lock()` call to prevent race conditions across your services. TypeScript library with fencing tokens, auto-cleanup, and Redis/Firestore support.

What is SyncGuard?

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Automatic Safety

Fencing tokens and ownership tracking prevent stale lock problems. Your critical sections stay protected even when processes crash or networks fail.

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Zero-Config Cleanup

TTL-based expiration means locks automatically release. No manual cleanup, no orphaned locks, no midnight pages about stuck resources.

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Backend Flexibility

Switch between Redis and Firestore without changing your code. Same API, same guarantees, different infrastructure.

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Built for TypeScript

Full type safety with discriminated unions and capability inference. Know at compile-time what guarantees your backend provides.

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Smart Retries

Exponential backoff with jitter handles contention automatically. Configure max retries, timeout, and backoff strategy to match your needs.

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Developer Experience

Simple `await lock()` for auto-managed locks or manual control with acquire/release/extend. APIs designed to be hard to misuse.