I got the email on Friday telling me I'm one of the fortunate few to get $550 and cynically thought that it was some sort of GitHub credit; needless to say that I was pleasantly surprised that it was actual cash!
I've been solo maintaining my project since 2008 and average about ~425,000 downloads/week per NPM. My sum total of donations prior to GitHub's was maybe $5. Making money on a JavaScript library was certainly never my goal but I sincerely appreciate the acknowledgement that my project has worth that someone is willing to pay for.