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.
You're lucky. I left FOSS dev because I got tired of my free time being abused by people like the one in your post
I've had to adopt a two strikes policy towards these aggressive trolls, who treat you like your their personal servant, especially since they make up like <1% of ppl on issue trackers. After a warning, if they don't play nice, then they're out.
It's the only way to keep the coding experience enjoyable, and not suffer from burnout.