This is part of the Fake.Runtime module. LegacyApiHelper Nested types and modules TypeDescription NewApiMutableHelper<'a> Functions and values Function or valueDescription ofRef(r) Signature: r:'?16378 ref -> NewApiMutableHelper<'?16378> Type parameters: '?16378 toGetSet(f) Signature: f:(unit -> NewApiMutableHelper<'?16380>) -> (unit -> '?16380) * ('?16380 -> unit) Type parameters: '?16380