Optional property: stringOptional toggle: booleanCurrent state: collapsed.
The label of the group or column.
Internal: the implementation type of the node.
Optional propertySet on leaves only: the property shown in this column.
Optional toggleShow a ❯ toggle so that the user can collapse / expand the group.
When is this child visible? "always" – also when the group is collapsed; "inverted" – only when collapsed
(e.g. a summary column); "normal" / undefined – only when expanded.
Sub-groups or columns.