You're going to have that problem with any codebase written by people who don't particularly know the language. Typescript written by PHP programmers, Python written by Java programmers, you'll quickly get a huge impenetrable pile of crap.

You can optimize your codebase to be modified by an ever rotating group of people who don't fully understand it, or by a smaller group of people who do. Both are legitimate choices in specific contexts. But if you take a codebase written one way and try to maintain it the other way, your productivity will tank.