Notice that you do not need `required` here. Basically `required` removing the `undefined` and `null` from the list of the `is` array.
However, I would keep it, because my intention is expose the basic type (string, boolean, number…) from "somewhere" (probably the `api-utils` even if it's deprecated) due the fact we're using them everywhere.

So, in short: keep it, I just add this comment to be sure you were aware of the usage. :)