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:'?16498 ref -> NewApiMutableHelper<'?16498> Type parameters: '?16498 toGetSet(f) Signature: f:(unit -> NewApiMutableHelper<'?16500>) -> (unit -> '?16500) * ('?16500 -> unit) Type parameters: '?16500