Thanks! Glad to hear it was useful :)
For the most part, it's considered redundant. According to npm and their recommendation, users can infer that it supports JS by being on npm and having a package.json file, and if you need to specify that it's specifically for Node, you can do so by adding an "engine" entry in your package file.
I would also add, though this is purely personal opinion, that adding js and/or node to the name might lead less experienced users to believe that it's an official package.
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