:adhesive_bandage: Typescript 5.5 generated types dont include `typedef`

[scagood]

See also: #316 #317 #212

In v17.10.0 we updated to ts@5.5, which caused the Configs type to not get generated in the output.

Typescript 5.5 generated types:

Typescript 5.4 generated types:

This is bad because we did not notice in the tests that the Configs were missing!

We should implement tests to check the output types to ensure they're at least valid. (eg #212)