How to make an Url optional?

[awhitford]

I am running into a problem creating an optional url because an empty string is not considered a valid url. For example:

v.optional(v.string([v.maxLength(255), v.url()])) 

doesn't seem to accept an empty string (which would be a typical optional value on a web form).

[fabian-hiller]

I recommend to use union:

• https://valibot.dev/guides/unions/
• https://valibot.dev/api/union/

import * as v from 'valibot';

const UrlSchema = v.union([v.literal(''), v.string([v.maxLength(255), v.url()])]);