Function collapseGroup

lib/aria.js:166–172

(group, depth)

// Large group of same-role siblings → first N + placeholder line + last N.
// Returns mix of AriaNode (to render) and pre-rendered placeholder strings.
function collapseGroup(group, depth) {
  if (group.length <= SIBLING_COLLAPSE_THRESHOLD) return group
  const keep = SIBLING_COLLAPSE_KEEP_EACH_SIDE
  const omitted = group.length - keep * 2
  const placeholder = `${'  '.repeat(depth)}- ...${omitted} similar "${group[0].role}" items omitted...`
  return [...group.slice(0, keep), placeholder, ...group.slice(-keep)]
}

function renderTree(nodes, depth = 0) {
  const items = groupByConsecutiveRole(nodes).flatMap(group => collapseGroup(group, depth))