Where is the code than handles the if property in ArgTypes?

[noahgregory-basis]

According to the API docs, you can use an if property in ArgTypes:
https://storybook.js.org/docs/vue/api/arg-types#if

For the life of me, though, I cannot find where this code exists in the Storybook codebase. It does work, yes, but I am curious what makes it work.