import { type GraphNode, type GraphTree } from "./graphTypes.js";
/**
 * Projects graph nodes into a root + parent/children map for UI traversal.
 * Hierarchy is determined by frontmatter.parents on each child node.
 * Nodes with no valid parent are attached to root.
 * Expects: node ids are unique; root node id is `__root__` when present.
 */
export declare function graphTreeBuild(nodes: GraphNode[]): GraphTree;
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