Agreed. I updated the blog to add an example. Copy/pasting here:

I spend a decent amount of time in the redux world so `redux-toolkit` is a great library to see how types are done *correctly* in a real codebase. To be clear, they do a fantastic job with types, but the level of complexity is pretty startling.

https://github.com/reduxjs/redux-toolkit/blob/master/package...

That is just one example but the codebase is riddled with complex types. Also, when you look around, note the amount of types vs actual code.

It's pretty common in style guides to never nest ternaries. In typescript, that's the only way to narrow types based on other types. It's a mess!