Interesting, I've come to the opposite conclusion: a lack of types (or types that are only weakly enforced) costs me significantly more tokens in the long-run to maintain, and makes it far too easy for models to silently introduce bugs.

I run all my projects now in TypeScript with the strictest possible settings, including disabling `ts-ignore` markers.

(This would drive me absolutely insane, but my agents get over it pretty quickly!)