@Override
  public EntityData.World serializeWorld() {
    final EntityData.World.Builder world = EntityData.World.newBuilder();
    writeIdInfo(world);

    if (isUsingLookupTables()) {
      writeComponentTypeTable(world);
    }

    for (Prefab prefab : prefabManager.listPrefabs()) {
      world.addPrefab(serializePrefab(prefab));
    }

    for (EntityRef entity : entityManager.iteratorEntities()) {
      world.addEntity(serializeEntity(entity));
    }
    return world.build();
  }