Is-Video
npmjs.com
npmjs.com
First reaction is that it's ridiculous to make this an npm package and it looks like a caricature of criticism against dependency overload. But I saw that it's a package by sindresorhus and as far as I can tell he has a very positive reputation in the open-source community. However he has many, many npm packages like this. I don't think it's supposed to be ironic.
The best steelman I can make is that it's a made by a well-known maintainer and probably has enough eyeballs on it that any changes to file format extensions will be picked up pretty quickly. But that's a pretty week justification for this.
Plus, if, at some point, people decide that extension checking is not enough, that can be added here, and the fix shared with everyone. It's future proofing to separate that into a reusable project.
It's kind of excessive, and if it were me I would probably not think to even look for a library, or else I would want a more powerful and generic file type identification tool, even if at the moment I only needed video, I'd just let the tree shaker clean up the stuff I wasn't using.
But I don't really have much of a problem with it. Unless of course, there's no testing process in place to be sure they don't release sabotageware. Being widely trusted doesn't matter as much in the age of neokaczynski types and various others who get disillusioned with tech in general.