proc gdexport_internal(info: HeapPropertyInfo; typ: StringName;
                       getter = StringName(); setter = StringName()) {.
    ...raises: [], tags: [RootEffect], forbids: [].}

proc gdexport_internal(name: string; typ: typedesc[SomeUserClass];
                       proptyp: typedesc[SomeProperty];
                       getter, setter: StringName; appearance: Appearance;
                       description: string)

proc instantiate_internal[T: SomeEngineClass](Type: typedesc[T]): T

proc instantiate_internal[T: SomeUserClass](Type: typedesc[T]): T

proc propertyinfo(name: StringName; appearance: Appearance): HeapPropertyInfo {.
    ...raises: [], tags: [], forbids: [].}

proc propertyinfo(name: StringName; proptyp: typedesc[SomeProperty];
                  appearance: Appearance): HeapPropertyInfo

proc register(T: typedesc)

proc unregisterAll() {....raises: [], tags: [RootEffect], forbids: [].}

macro register_implicitly(level: static InitializationLevel)