import { Group, Object3D } from "three";
import { World } from "koota";
//#region src/ecs/systems/sceneGraphSyncSystem.d.ts
/**
 * Create a scene-graph sync system bound to its own scratch state.
 *
 * Each SpriteGroup constructs one. The returned function rebuilds the
 * Group's children from the sorted batch-entity list. Only runs when
 * renderOrderDirty is set (batches added/removed).
 *
 * Closes over the active-meshes Set so it's cleared-and-filled per call
 * instead of allocated. Each group has its own Set.
 *
 * @returns a system function: (world, parent, parentAdd, parentRemove) => void
 */
declare function createSceneGraphSyncSystem(): (world: World, parent: Group, parentAdd: (...objects: Object3D[]) => Group, parentRemove: (...objects: Object3D[]) => Group) => void;
//#endregion
export { createSceneGraphSyncSystem };
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