From my own sampling of going through about 10 times I used GPT for real world Typescript code, some used in production, I can confirm that GPT-4 does a noticea

From my own sampling of going through about 10 times I used GPT for real world Typescript code, some used in production, I can confirm that GPT-4 does a noticeably better job and produces code I actually want to use way more often. GPT-3.5 always produced very verbose types and over engineered code. The GPT-4 outputs were consistently shorter and more focused. Kind of like how a junior dev has to think through all the smaller steps and makes functions for each, as he incrementally solves the problem slower and less intuitively, almost over explaining the basics, while a senior dev merges the simpler stuff into small concise functions. You can see it with the var names and type choices GPT-4 focused much more on what the code is trying to accomplish rather than what the code itself is doing. And these are all with the same prompts. There’s still things like unused vars being included occasionally and some annoying syntax choices, if I could append prettier/eslint rules automatically to GPT output it’d be gold (I haven’t tried to do this myself). But still very encouraging.