Method getTypeHierarchy

src/graph/traversal.ts:412–436

* Get the type hierarchy for a class/interface * * @param nodeId - ID of the class/interface node * @returns Subgraph containing the type hierarchy

(nodeId: string)

   * @returns Subgraph containing the type hierarchy
   */
  getTypeHierarchy(nodeId: string): Subgraph {
    const focalNode = this.queries.getNodeById(nodeId);
    if (!focalNode) {
      return { nodes: new Map(), edges: [], roots: [] };
    }

    const nodes = new Map<string, Node>();
    const edges: Edge[] = [];
    const visited = new Set<string>();

    // Add focal node
    nodes.set(focalNode.id, focalNode);

    // Get ancestors (what this extends/implements)
    this.getTypeAncestors(nodeId, nodes, edges, visited);

    // Get descendants (what extends/implements this)
    this.getTypeDescendants(nodeId, nodes, edges, visited);

    return {
      nodes,
      edges,
      roots: [nodeId],
    };
  }

  private getTypeAncestors(
    nodeId: string,