> There are a lot of performance benefits with writing everything yourself instead of using 3rd-party libraries. In my production experience correctness always

> There are a lot of performance benefits with writing everything yourself instead of using 3rd-party libraries. In my production experience correctness always trumps speed. And language parsing is not a trivial task. Not every programmer can write a program to do it well (and fast). I know that so far I am not one of the programmers who can, for example. I prefer to defer to the expertise of those who do it for a living and/or their academic pursuits (as long as they write clean and maintainable code). So while the general point you quoted can absolutely be viable in many situations -- I've wrote stuff from scratch no small amount of times so I definitely can relate -- the original point here was language parsing where I believe your (and Evan's) take is prioritizing idealism to reality. And the reality is, most programmers aren't good with this stuff, and that's okay. As for him and esbuild, I only have huge respect to show. But he's one of the few, not one of the many. He should be doing that and he did it very well (I use esbuild and adore it).