在npm安装之前，删除node_modules吗？

Question

是否需要在执行“ npm install”之前删除node_modules以获得更可靠的安装，还是npm覆盖所有内容？

Answer 1

Npm definitely does not overwrite everything every time. It runs through a fairly complicated process that I won't dive deep into here, but in general you should not need to delete node_modules every time. npm exists to handle this situation and generally will only download newly added or updated packages.

I will occasionally find myself in the need to completely remove the node_modules directory in the event that I have been add/removing/updating a large number of packages. Sometimes packages can get cached. But it's not a common occurrence and I usually only recommend it when you notice a package appears out of date.