Partial and required variants

A form lets users fill in fields gradually, so you want a type where everything is optional while they edit and a type where required fields are required when they save. Rather than making every field optional in the content model, derive the variants:

Function	Effect
shallowPartial(schema)	Every top-level field becomes optional
shallowRequired(schema)	Every top-level field becomes required
deepPartial(schema)	Every field becomes optional, recursively through nested objects
deepRequired(schema)	Every field becomes required, recursively through nested objects
required(schema)	Removes optional() from a single schema

_type stays required in all of them.

import * as s from '@sanity-labs/typed-schema'

const ContactDetails = s.object({
  name: s.string(),
  address: s.object({street: s.string(), city: s.string()}),
  email: s.string(),
})

// Validate against this when the user saves
type ContactDetails = s.Infer<typeof ContactDetails>

// Use this while the form is being filled in
const PartialContactDetails = s.deepPartial(ContactDetails)
type PartialContactDetails = s.Infer<typeof PartialContactDetails>
   
type PartialContactDetails = {
    name?: string | undefined;
    address?: {
        street?: string | undefined;
        city?: string | undefined;
    } | undefined;
    email?: string | undefined;
}