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:'?15940 ref -> NewApiMutableHelper<'?15940> Type parameters: '?15940 toGetSet(f) Signature: f:(unit -> NewApiMutableHelper<'?15942>) -> (unit -> '?15942) * ('?15942 -> unit) Type parameters: '?15942