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:'?15950 ref -> NewApiMutableHelper<'?15950> Type parameters: '?15950 toGetSet(f) Signature: f:(unit -> NewApiMutableHelper<'?15952>) -> (unit -> '?15952) * ('?15952 -> unit) Type parameters: '?15952