CompChangeEvent
@Js
class CompChangeEvent : Obj
CompChangeEvent includes details when a component slot is modified
Subject component
Name of slot modified
New value or null if removing slot
Old value or null if adding new slot
Spec of slot if defined for name (null if dynamic slot)
Debug string - format subject to change
Comp : comp
Subject component
const Str : name
Name of slot modified
Obj? : newVal
New value or null if removing slot
Obj? : oldVal
Old value or null if adding new slot
const Spec? : slot
Spec of slot if defined for name (null if dynamic slot)
virtual Str toStr()
Debug string - format subject to change