Way to turn properties into X | null?

[xaviergonz]

Is there something like O.Nullable but that actually makes keys turn into V | null?
e.g.

interface A { x: number; y: number }
type AN = O.NullNullable<A, "x">
// AN is { x: number | null; y: number }

[millsp]

Yes, you can use Update

[xaviergonz]

Is this supposed to work then? It doesn't for me

interface A {y: number}
type C = O.Update<A, "y", A.x | null>
const c: C = {y: 4} // complains about 'y' being a number

[xaviergonz]

Nevermind, didn't work on 4.1.0 but works on 4.3.0