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:'?16253 ref -> NewApiMutableHelper<'?16253> Type parameters: '?16253 toGetSet(f) Signature: f:(unit -> NewApiMutableHelper<'?16255>) -> (unit -> '?16255) * ('?16255 -> unit) Type parameters: '?16255