FlattenedTreeRow

Since v0.1.1

A flattened tree row with hierarchy metadata *

Properties

Property	Type	Description
key	string	Unique key identifying this row
data	T	Original row data
depth	number	Depth level in the tree (0 = root)
hasChildren	boolean	Whether this row has children
isExpanded	boolean	Whether this row is currently expanded
parentKey	string | unknown	Key of the parent row, or null for root level
posInSet	number	1-based position among siblings at the same level (for aria-posinset).
setSize	number	Total number of siblings at this level under the same parent (for aria-setsize).