Are there negation types/operators?

[sschneider-ihre-pvs]

Is there something like .xor() or .not() possible?
For example z.string().optional().xor(z.string().nonempty()) so either it does not have a value at all or if it has a value it ought to be not empty. For example if you verify a payload that only has a changeset and this value was not changed hence not in the changeset but if it was changed than the value is not allowed to be empty.

[JacobWeisenburger]

There isn't a concept of xor or not that I know of, but you could do your example as shown below:

const optionalNonEmptyString = z.string().min( 1 ).optional()
type OptionalNonEmptyString = z.infer<typeof optionalNonEmptyString>
// type OptionalNonEmptyString = string | undefined

console.log( optionalNonEmptyString.safeParse( 'foo' ).success ) // true
console.log( optionalNonEmptyString.safeParse( undefined ).success ) // true
console.log( optionalNonEmptyString.safeParse( '' ).success ) // false

For other schemas that you want to use not, you could do something using refine.