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He mentions what he uses in a different post of his: https://news.ycombinator.com/item?id=21194300

Sadly it seems he's not interested in sharing the code. That's legit, but would be nice to get a confirmation.

Yeah, I don't currently have any plans to release the code unfortunately. But in short it's a scenegraph library written in typescript plus a sprawling collection of algorithms in various states of completion. The scenegraph can be rendered to an SVG string and since the library does not depend on any browser specific APIs it can be run both in node.js and in a browser. For interactive browser based experimentation I use Vue.js for GUI stuff.

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