@assigned decorator is used to mark a method of a
ConditionBlock that is invoked when the block is assigned to a node or condition. If there was another block attached to the node or condition, a reference to that previous block is supplied to the decorated method.
Decorated method signature
(previous?: NodeBlock | ConditionBlock | undefined): void
Decorated method parameters
ConditionBlock | undefined
|Reference to the previous block that was attached to the node or condition (or
undefined if there was no previous block attached).