React. react-sizeme sounds like it could be useful for measuring DOM nodes after they're rendered / The React folks are working on a Profiler tool, which may make performance enhancements easier than with packages such as why-did-you-update / react-pdf promises to let you build PDFs in JSX.
Design Systems. The GDS system published the GOV.UK Design System.
Creative coding. rabbitear is an origami-building library for the web.
TIL. I didn't know this about this about the String split() method:
separatoris a regular expression that contains capturing parentheses, then each time
separatoris matched, the results (including any undefined results) of the capturing parentheses are spliced into the output array.
Soundtrack. Driftmachine — Shunter