I don't think most people have control of the code base they're required to work in.

I too have converted a code base I made to typescript and peppered it with AI docs to make visibility easier.

I've converted i18n files to a k:v[] arrays per language because the AI is shit at working with objects. The ability now for it to just find/insert additional languages is well improved.

There definitely are shapes in code that the AI will have trouble with.

But again, I don't think most people have control over the code they maintain.