How to write classes without type declaration mess?

[Daw588]

I am writing classes for my chassis project, I wanted to have types so I followed one of the suggested formats. But it has gotten so bad to the point that I had to separate type declarations into different files. I am getting really tired of having to modify them each time I want to change something, is there a better way of doing this while still getting full type support?

Here is what monster I got: