The whole command-line tools in JS trend was, I think, in full swing in 2013. I mean even in the 2013 version that another commenter linked, they're relying on

The whole command-line tools in JS trend was, I think, in full swing in 2013. I mean even in the 2013 version that another commenter linked, they're relying on the built-in NPM support for installing command-line tools and the existing popular NPM packages for command-line parsing and output. And if people were trying to fight that trend (which to be fair is a bad trend; I refuse to run software from the NPM ecosystem to this day), this is a weird example to pick because the point of the tool is to use JavaScript's regular expression syntax.