Type Alias FFIReturn<T>

FFIReturn: FFIType extends T
    ? any
    : T extends null
        ? undefined
        : T extends { _check_retval_: (...args: never[]) => infer Result }
            ? Result
            : T extends StructureClass ? InstanceType<T> : JsFromCType<T>

JS value returned by a function with restype T. As in Python, a POINTER(T) restype returns a PointerInstance, a CFUNCTYPE restype a callable function (null for NULL) and a Structure/Union class an instance of that class.