Having worked on large backend codebases in both TS and JS, the difference is stark. The TS API in my case had something like 90% less errors, and those were all subtle bugs in business logic.
On the other hand, the large JS API over time had all sorts of unexpected type errors and undefined behavior. I'm aware that this is anecdotal evidence, but TS is pretty much a no-brainer now on backend.
Having worked on large backend codebases in both TS and JS, the difference is stark. The TS API in my case had something like 90% less errors, and those were all subtle bugs in business logic.
On the other hand, the large JS API over time had all sorts of unexpected type errors and undefined behavior. I'm aware that this is anecdotal evidence, but TS is pretty much a no-brainer now on backend.