When you're talking to an open source dev, just remember that they are literally giving you their time for free, and they are people who don't like to be treated poorly.
Edit: Just to be clear, I don’t mean any ill will toward the guy. He’s frustrated and he’s just taking it out in the wrong venue at the wrong people, but that doesn’t mean he’s a bad person.
Edit 2: The reinstalling he’s talking about is NPM. So just running npm install. It’s because he tried removing the node_modules directory, which is a reasonable thing to do, but it means you need to reinstall the modules with that command.
Being polite is better than not being polite, but the way I see it, all user complaints are valid and are better not taken personally if possible. Maybe you as the developer didn't do anything wrong that contributed to their problem, or are not actually in a position to resolve whatever their problem is, but it's worth keeping in mind the bigger picture: how well peoples computers work to benefit their lives.
If someone is getting upset that they have to spend time troubleshooting, maybe because they didn't understand something or made a mistake, there's definitely other people going through the exact same less-than-ideal experience and not saying anything about it. That's information about the state of how well things are working and it's better for it to be out there in some form than not.
Yeah, I didn’t take it personally. He’s just venting, but doing it toward the person trying to help you is unhelpful. That’s why I posted here, basically saying to remember that you’re talking to a person, not a punching bag.