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:'?15819 ref -> NewApiMutableHelper<'?15819> Type parameters: '?15819 toGetSet(f) Signature: f:(unit -> NewApiMutableHelper<'?15821>) -> (unit -> '?15821) * ('?15821 -> unit) Type parameters: '?15821