Function mergeThreadItems

src/utils/threadItems.listOps.ts:208–227

(
  remoteItems: ConversationItem[],
  localItems: ConversationItem[],
)

}

export function mergeThreadItems(
  remoteItems: ConversationItem[],
  localItems: ConversationItem[],
) {
  if (!localItems.length) {
    return remoteItems;
  }
  const byId = new Map(remoteItems.map((item) => [item.id, item]));
  const localItemsById = new Map(localItems.map((item) => [item.id, item]));
  const merged = remoteItems.map((item) => {
    const local = localItemsById.get(item.id);
    return local ? chooseRicherItem(item, local) : item;
  });
  localItems.forEach((item) => {
    if (!byId.has(item.id)) {
      merged.push(item);
    }
  });
  return merged;
}