{#- TypeScript helper functions for tree assertions

   Static content: no context variables needed
#}
function _alefE2eText(value: unknown): string {
  return value == null ? "" : String(value);
}

function _alefE2eItemTexts(item: unknown): string[] {
  if (item == null || typeof item !== "object") {
    return [_alefE2eText(item)];
  }
  const record = item as Record<string, unknown>;
  const itemsText = Array.isArray(record.items) ? record.items.map(_alefE2eText).join(" ") : "";
  return [_alefE2eText(item), _alefE2eText(record.kind), _alefE2eText(record.name), _alefE2eText(record.source), _alefE2eText(record.alias), _alefE2eText(record.text), _alefE2eText(record.signature), itemsText];
}

function _alefE2eFormatMetadataDisplay(fm: unknown): string {
  if (fm == null) return "";
  if (typeof fm !== "object") return String(fm);
  const record = fm as Record<string, unknown>;
  const formatType = record.format_type;

  // FormatMetadata is a tagged union: { format_type: 'image', image: { format: 'PNG', ... }, ... }
  // Extract the display string based on the variant type
  if (formatType === "image" && typeof record.image === "object") {
    const imageData = record.image as Record<string, unknown>;
    if (typeof imageData.format === "string") return imageData.format;
  }

  // Fallback: return format_type variant name
  if (typeof record.format_type === "string") return record.format_type;
  return "";
}
