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:'?16552 ref -> NewApiMutableHelper<'?16552> Type parameters: '?16552 toGetSet(f) Signature: f:(unit -> NewApiMutableHelper<'?16554>) -> (unit -> '?16554) * ('?16554 -> unit) Type parameters: '?16554