Whether this node is busy. Greater than 0 then busy; otherwise not.
The additional tree decoration data attached to the tree node itself.
A human-readable description of this tree node.
A css string for this tree node icon.
An unique id of this node.
A human-readable name of this tree node.
A next sibling of this tree node.
A parent node of this tree node. Undefined if this node is root.
A previous sibling of this tree node.
Test whether this node should be rendered. If undefined then node will be rendered.
Type-guard for decorated tree nodes.