I found this article helpful.

I was very surprised by the quality of the code in the replace.js repo given the vitriol that surrounded it. I'm not a big contributor to open source, but I've recently made some modifications (improvements?) to a Haskell library I use and was planning to make a pull request soon. This event gave me pause. As someone who couldn't tell what was so eye-bleedingly bad about the replace.js code, I was nervous that I would endure a similar fate.