The Node class's internal addChildren handler.
The D3 HierarchyPointNode representation of the node, which wraps nodeDatum
with additional properties.
The full datum of the node that is being rendered.
The onNodeClick handler defined for Tree (if any).
The onNodeMouseOut handler defined for Tree (if any).
The onNodeMouseOver handler defined for Tree (if any).
Toggles the expanded/collapsed state of the node.
Provided for customized control flow; e.g. if we want to toggle the node when its label is clicked instead of the node itself.
The properties that are passed to the user-defined
renderCustomNodeElementrender function.