Why can required fields be undefined as type?

[Nikola-Milovic]

So if I have a schema like so

const schema = object({
  title: string().required(),
  description: string().required()
});

const { handleSubmit } = useForm({ validationSchema: schema });

the values of the submit will be

(parameter) values: TypeOfShape<{
    title: RequiredStringSchema<string | undefined, AnyObject>;
    description: RequiredStringSchema<string | undefined, AnyObject>;
}>

Why is the type string | undefined? These fields specifically cannot be undefined right?

[logaretm]

That is a question you should submit to yup not vee-validate. But you can fix that by adding .defined or .default to remove the undefined type possibility.

const schema = object({
  title: string().required().defined(),
  description: string().required().defined()
});

I believe the types will change with yup's 1.0 release.

[Nikola-Milovic]

Oh sorry, didn't occur to me that the types were just passed down to Vee validate... Thanks!

[Delari]

sorry to fit in - even realizing that this question is more to yup - but aren't string().default(null) and string().nullable() the same?