>And to be just a tad pedantic: you have JS in production; your TS is only in dev.

This is not even pedantic, it's wrong. You have JS/TS in both dev and prod, with javascript being the actual runtime code in both, and typescript checking your code at build time in both. If you're running javascript compiled/checked by , and written in, typescript, it's not uncommon or unreasonable to call it typescript.