sync_engine #

Pure-Dart, immutable CRDT primitives for flutter_sync_engine. It can be tested with dart test and deliberately has no Flutter dependency.

LWW conflict resolution #

LWWRegister uses vector clocks for causal order. If two writes are concurrent, it selects the value from the lexicographically greater node ID. That rule is deterministic but arbitrary; applications needing domain-specific resolution should provide it above this primitive.

SyncEngine serializes sync cycles, validates transport acknowledgements, and keeps the outbox cursor from advancing when a push fails. Durable persistence is provided by sync_engine_drift; the core package ships the outbox contract and in-memory implementation.