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master @ 40 LINES
 
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export interface TreeNode {
  label: string;
  href?: string;
  children?: TreeNode[];
  /** Marks the row for the page being viewed. */
  current?: boolean;
}

export interface TreeRow {
  prefix: string;
  label: string;
  href?: string;
  current?: boolean;
}

export interface Props {
  nodes: TreeNode[];
}

// Depth 0 renders bare (a root line); deeper levels get branch glyphs.
export function layoutTree(nodes: TreeNode[]): TreeRow[] {
  const out: TreeRow[] = [];
  const walk = (ns: TreeNode[], prefix: string, depth: number) => {
    ns.forEach((n, i) => {
      const last = i === ns.length - 1;
      out.push({
        prefix: depth === 0 ? "" : prefix + (last ? "└── " : "├── "),
        label: n.label,
        href: n.href,
        current: n.current,
      });
      if (n.children?.length) {
        walk(n.children, depth === 0 ? "" : prefix + (last ? "    " : "│   "), dep
th + 1);
      }
    });
  };
  walk(nodes, "", 0);
  return out;
}


export interface TreeNode {
  label: string;
  href?: string;
  children?: TreeNode[];
  /** Marks the row for the page being viewe
d. */
  current?: boolean;
}

export interface TreeRow {
  prefix: string;
  label: string;
  href?: string;
  current?: boolean;
}

export interface Props {
  nodes: TreeNode[];
}

// Depth 0 renders bare (a root line); deepe
r levels get branch glyphs.
export function layoutTree(nodes: TreeNode[]
): TreeRow[] {
  const out: TreeRow[] = [];
  const walk = (ns: TreeNode[], prefix: stri
ng, depth: number) => {
    ns.forEach((n, i) => {
      const last = i === ns.length - 1;
      out.push({
        prefix: depth === 0 ? "" : prefix + 
(last ? "└── " : "├── "),
        label: n.label,
        href: n.href,
        current: n.current,
      });
      if (n.children?.length) {
        walk(n.children, depth === 0 ? "" : 
prefix + (last ? "    " : "│   "), depth + 1
);
      }
    });
  };
  walk(nodes, "", 0);
  return out;
}

 
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