Previously I was the lead support engineer at Fig (which has since become Amazon Q) and maintainer of withfig/autocomplete. I wrote the fastest, fully complete JavaScript command-line argument parser (by my measurements and real-world benchmarks) but abandoned it because it encourages creating a worse end-user experience, since cold start single execution programs are a worst-possible-case scenario for JavaScript engines.
While I was working in IT, I also wrote an excellent API wrapper for the Jamf School MDM, and a bunch of other libraries necessary for it including deno_mock_fetch and apple_device_identifiers.
There's also a few really old Python projects that I wrote that have over 200,000 downloads in total on PyPI.