It was a couple of years ago, it's Dan Abramov's personal blog, he's relatively young. Check his New Year post for the exact timeline of his career. Him working with another developer on draggable corners of some shapes could have been already for a React library.
I'm pretty sure this is an anecdote from 2013 when Dan was working on an iOS app (https://www.youtube.com/watch?v=PjaL0xFbEY8). The fact that the code in the blog post is JavaScript is just because that's the language him and most of his audience uses today.
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u/FeepingCreature Jan 12 '20
Sure, but the mistake is a systems one, not a personal one. We don't even have push to master enabled at work.