StripePurchaseModelMirrorRefPath typedef
StripePurchaseModelMirrorRefPath = _$StripePurchaseModelMirrorRefPath
It can be defined as an empty ModelRef
StripePurchaseModelMirrorRefPath("xxx") // Define as a path.
Implementation
typedef StripePurchaseModelMirrorRefPath = _$StripePurchaseModelMirrorRefPath;