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:'?16495 ref -> NewApiMutableHelper<'?16495> Type parameters: '?16495 toGetSet(f) Signature: f:(unit -> NewApiMutableHelper<'?16497>) -> (unit -> '?16497) * ('?16497 -> unit) Type parameters: '?16497