def observer
import bendvy-ecs-core@0.1.0.4/ordinary_optional_resource_declaration.bend as OrdinaryOptionalResourceDeclarationimport Base
import bendvy-ecs-core@0.1.0.4/world.bend as W
37def observer(~S:Data,~C:Type,~R:Type,~E:Data,~Ops:Type -> Type,~V:Data,declaration:Declaration<S,C,R,E,Ops,V>) -> W.World<S,C,R,E> -> W.World<S,C,R,E> & V:
38 match declaration:
39 case Declaration{_,_,observe,_}:observe