No, this is simply a JS file you can use it in client side project too (like in Angular/react).

For example, If you are using Angular, you can place this file on the root level and run this file before every commit, it will update you sitemap file.

Moreover if you wish to do it automate process add this file run command in prehooks of git commit, file will automatically run and update as required.

Let me know in case you still have any query on this. Thanks :)