Represents the object of the onExpandChange event (see example).

item any

The item that is expanded or collapsed.

itemHierarchicalIndex string

The hierarchical index of the item. The indices are zero-based. The first root item has a 0 (zero) index. If the first root item has children, the first child acquires a 0_0 index and the second acquires a 0_1 index.

nativeEvent any

A native DOM event.

syntheticEvent SyntheticEvent<any>

A React Synthetic Event.

target TreeView

An event target.