import type { HsonNode } from "../../../core/types.js";
export type SubtreeTraversalOrder = "pre" | "post";
/**
 * Collect every Hson node in a subtree using graph structure only.
 *
 * Structural VSN nodes are included and primitive content is ignored. Child
 * order follows `$_content`, making both supported traversal orders stable.
 */
export declare function collect_subtree_nodes(root: HsonNode, order?: SubtreeTraversalOrder): readonly HsonNode[];
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