Is this a reference to something? I can't imagine it would take 500mb to reimplement git in JavaScript. This one's <75kb and full of explanations: https://github.com/maryrosecook/gitlet

It's a dig at the typical size of a `node_modules` folder. These often are very large, and often do contain several thousand files, largely due to transitive dependencies.

For anyone looking to use Git in JS, check out https://github.com/isomorphic-git/isomorphic-git. I've had great success with it and really like it as a library. It's API design is good and it's tree-shakeable so the size of the library is very reasonable, even if taking it as a whole.