Previously I was the lead support engineer at Fig (which has since become Amazon Q) and maintainer of withfig/autocomplete. By my measurements at the time, I wrote the fastest fully complete JavaScript command-line argument parser but abandoned it because it encourages creating a worse end-user experience since cold start single execution programs are a worst-case scenario for V8.
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.