> in JS land almost everyone uses lax dependency declarations

They do, BUT.

Dependency versioning schemes are much more strictly adhered to within JS land than in other ecosystems. PyPi is a mishmash of PEP 440, SemVer, some packages incorrectly using one in the format of the other, & none of the 3 necessarily adhering to the standard they've chosen. Other ecosystems are even worse.

Also - some ecosystems (PyPi again) are committing far worse offences than lax versioning - versionless dependency declaration. Heavy reliance on requirements.txt without lockfiles where half the time version isn't even specified at all. Astral/Poetry are improving the situation here but things are still bad.

Maven land is full of plugins with automated pom.xml version templating that has effectively the same effect as lax versioning, but without any strict adherence to any kind of standard like semver.

Yes, the situation in JS land isn't great, but there are much worse offenders out there.

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simiones 2 hours ago | parent | next [-]

The point is still different. In PyPI, if I put `requests` in my requirements.txt, and I run `pip install -r requirements.txt` every time I do `make build`, I will still only get one version of requests - the latest available the first time I installed it. This severely reduces the attack radius compared to NPM's default, where I would get the latest (patch) version of my dependency every day. And the ecosystem being committed to respecting semver is entirely irrelevant to supply chain security. Malicious actors don't care about semver.

Overall, publishing a new malicious version of a package is a much lesser problem in virtually any ecosystem other than NPM; in NPM, it's almost an automatic remote code execution vulnerability for every NPM dev, and a persistent threat for many NPM packages even without this.

	▲	debazel an hour ago \| parent [-]
		> This severely reduces the attack radius compared to NPM's default, where I would get the latest (patch) version of my dependency every day. By default npm will create a lock file and give you the exact same version every time unless you manually initiate an upgrade. Additionally you could even remove the package-lock.json and do a new npm install and it still wouldn't upgrade the package if it already exists in your node_modules directory. Only time this would be true is if you manually bump the version to something that is incompatible, or remove both the package-lock.json and your node_modules folder.

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Yeroc an hour ago | parent | prev [-]

> Maven land is full of plugins with automated pom.xml version templating that has effectively the same effect as lax versioning, but without any strict adherence to any kind of standard like semver.

Please elaborate on this. I'm a long-time Java developer and have never once seen something akin to what you're describing here. Maven has support for version ranges but in practice it's very rarely used. I can expect a project to build with the exact same dependencies resolved today and in six months or a year from now.