PyPI packages with malicious install scripts! https://www.nbu.gov.sk/skcsirt-sa-20170909-pypi/ (so few PLs have opt-in install scripts or run them in sandboxes)
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The niche of short, environment-specific scripts, and the consequences for programming language design choices: https://brrt-to-the-future.blogspot.com/2021/03/why-bother-with-scripting.html
The most common selling point I hear for Nix is having a list of all the packages you need.
On a traditional Linux distro, I just install things and forget about them. A curated, commented list would certainly be handy when I have a new system.
Has anyone built a great solution to 'run all my unit tests automatically'?
It's straightforward to write a while loop in bash, but handling timeouts, syntax errors etc well is hard.
Running on save would be good, although I wonder if you could run fast tests on each keystroke.