in src/spark_automerge_wrapper.js [194:204]
function processSyncMessage(state, syncStates, sourcePeerId, syncMessage) {
const [nextBackend, nextSyncState, patch] = Automerge.receiveSyncMessage(
state,
syncStates[sourcePeerId] || initSyncState(),
syncMessage
)
syncStates[sourcePeerId] = nextSyncState
return [nextBackend, patch]
}