How can I validate optional dates?

[jack-allocate]

I have a date input thats optional. But, if they do input something, I want to validate that its an ISO date.

  date: v.pipe(
    v.optional(v.string()),
    v.transform((value) => value ?? new Date().toISOString()),
    v.isoDate(),
  ),

I managed to get it working with the above, but I'm wondering if theres something easier.

[muningis]

Switching pipe and optional around seems to work

Playground link

[jack-allocate]

Thank you!