[Feature] Tests for types

# **Feature Request**

## **Is your feature request related to a problem? Please describe.**

Like would want to consider doing this for top-level types only? this is mostly a safety measure in my mind in case build configurations somehow break type exports

Options:
- https://vitest.dev/guide/testing-types.html
- https://github.com/JoshuaKGoldberg/eslint-plugin-expect-type
- https://github.com/mmkal/expect-type
- https://github.com/TypeStrong/ts-expect
- https://github.com/tsdjs/tsd