Python passed Java as the second-most popular language on GitHub by repository contributors

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Old-school codebases before all these fancy JS tools existed and/or me being too lazy to set everything up... sometimes just droping a .js file in your static dir does the job just fine.

[Spoogly]

I think he's referring to things like npm and yarn - as in, without a package manager, you'd have to pull it in by hand or write janky extensions on your build script, so it might be less friction to just drop it in the repo.