Well, to take an example: I work on the Mozilla Developer Network (MDN). MDN is mostly a wiki, and the underlying codebase for that is all in Python. There's also the Demo Studio, which lets people upload web technology demos, and that's Python too.
But the wiki also has an embedded script-ish language (letting people create macros/templates for specific purposes and re-use them across multiple articles). That's JavaScript-based, and so is implemented in node.js. And there's a WYSIWYG editor for the wiki pages, which is a couple of MDN-specific plugins we've developed, plus off-the-shelf components (the editor + jQuery, which we also use for a few other things on-site).
So MDN is a Python project with a couple JS utilities attached. And if you set up a local copy, you can pretty easily see that Python is by far the heaviest-used language. But due to the way GitHub counts and reports statistics, it shows up as a JavaScript project.
To pick on an easy example: the copy of jQuery we have in our repository weighs in at just over 9,000 lines. So just having jQuery means you need to write over 10k lines of code in order to get the "real" language of your project recognized.
One could argue that jQuery, and other libraries shouldn't be included in the repository proper, instead it could be a submodule or included in a package manager manifest, such as bower.
"N.B. If you aren't authoring a package that is intended to be consumed by others (e.g., you're building a web app), you should always check installed packages into source control."
The Node core dev actually went back and forth on this, and came to the conclusion to not commit dependencies to the repo, and introduced "shrinkwrap" [1].
It felt wrong committing dependencies to the repo, which I agree with. I hate my diffs being drowned in external changes, I'd rather see that someone simply upgraded a dependency. Plus it does skew the project, both for what the primary language is, as well as how much a committer is contributing.
I would love to see this eventually in Bower! They have an issue for it [2].
I agree. Hovertruck quoted a piece from the Bower documentation, which I can see the reasoning behind, if you're working on a web application then committing the library removes the possibility that the dependencies cannot be resolved because a library has been removed from the package manager. There are benefits to both options, but my personal preference is to keep third party libraries out of the VCS.
:D Just to take this a little further, at my old employment, our Ops wanted the dependencies to be committed to the repo. To make rolling back faster, since `npm install` can take awhile. Also, there was a time NPM register went down wrecking havoc.
But that's shouldn't put weight in either direction. Instead, there's a much deeper issue here: Ops should be building packages for deployment. Whatever that means, RPMs, VMs, Docker images, ... Just separate the concerns. Seal it up, and store it forever and ever, perfectly.
Because even if dependencies are there, safe and happy, most applications have a build process. Which takes time, and could be different on the machine it's building on. Only you can prevent production fires.
But the wiki also has an embedded script-ish language (letting people create macros/templates for specific purposes and re-use them across multiple articles). That's JavaScript-based, and so is implemented in node.js. And there's a WYSIWYG editor for the wiki pages, which is a couple of MDN-specific plugins we've developed, plus off-the-shelf components (the editor + jQuery, which we also use for a few other things on-site).
So MDN is a Python project with a couple JS utilities attached. And if you set up a local copy, you can pretty easily see that Python is by far the heaviest-used language. But due to the way GitHub counts and reports statistics, it shows up as a JavaScript project.
To pick on an easy example: the copy of jQuery we have in our repository weighs in at just over 9,000 lines. So just having jQuery means you need to write over 10k lines of code in order to get the "real" language of your project recognized.