The handle of the node that the connection is anchored to, which indicates the specific part of the node (e.g., 'n', 's', 'e', 'w', etc.) where the connection should attach.
OptionalindexAn optional index specifying a particular point on the node's geometry to anchor to, allowing for more precise connection points beyond just the handles.
Serialized representation of a connection anchor, where the 'node' property is represented by the node's identifier instead of a reference to the node object. This format is suitable for JSON serialization and deserialization.