React Native

const handle = asyncStorageAdapter(AsyncStorage)
await handle.ready
const fatigue = createFatigue({ storage: handle.storage })

The synchronous engine reads an in-memory cache while the adapter batches writes to the async backend. Always await ready before creating or using the engine. Call await handle.flush() when AppState enters background so pending writes survive termination.

If you set namespace, pass the identical value to both the adapter and createFatigue. Backend failures call onError; writes remain in memory but may not persist.