Function required

src/schema.ts:682–686

(message: Message<any> = locale.required)

  }

  required(message: Message<any> = locale.required): any {
    return this.clone().withMutation((next) =>
      next.nonNullable(message).defined(message),
    );
  }
  notRequired(): any {
    return this.clone().withMutation((next) => next.nullable().optional());
  }