I don't fully understand this code. It looks like the intent is to make it so that if everything in the ZIP file starts with the same folder name, then we strip that off in order to figure out what the top-level files are. However, it seems like we could get confused if the first few entries are actually all in a particular subfolder, and one of those files happens to be named "package.json" or "main.js". We might not care about that edge case (it doesn't seem super likely, since any submodules that have their own package.json will probably be further than one level deep), but if we're explicitly punting on it we should probably add a comment about it here (and warn developers about it).