class ComponentTypeManager {

 static var _componentTypes = new Map<Type, ComponentType>();

 static ComponentType getTypeFor(Type componentType){
   ComponentType type = _componentTypes[componentType];

   if (type == null) {
     type = new ComponentType();
     _componentTypes[componentType] = type;
   }
   return type;
 }

 static int getBit(Type componentType) => getTypeFor(componentType).bit;
 static int getId(Type componentType) => getTypeFor(componentType).id;
}