import type { Node } from "@babylonjs/core/node.js";
import type { ImportedEntity } from "./model-importer.js";
/**
 * Owns the mutable index produced from one projected scene document.
 * Babylon systems consume this state without owning its imported resources.
 */
export declare class RuntimeProjectionState {
    #private;
    get rootEntityIds(): readonly string[];
    setRootEntityIds(entityIds: readonly string[]): void;
    getNode(entityId: string): Node | null;
    setNode(entityId: string, node: Node): void;
    getImported(entityId: string): ImportedEntity | null;
    addImported(imported: ImportedEntity): void;
    importedRoots(): readonly Node[];
    frameNodes(entityId: string): readonly Node[];
    clear(): void;
}
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