问题
I already have a global node_modules folder in /usr/local/lib/node_modules, but I just found there is also a ~/node_modules folder under my home floder. Can I delete this one?
I execute node -e "console.log(global.module.paths)" and I get
[ '/Users/Username/node_modules',
'/Users/node_modules',
'/node_modules' ]
And if I delete the node_modules folder which is under home directory, then I execute npm list @vue/cli-ui , It would should this error:
/Users/Username
└── UNMET DEPENDENCY @vue/cli-ui@3.0.1
npm ERR! missing: @vue/cli-ui@3.0.1, required by Username
So, can I delete the node_modules foleder under my home directory? What's the use of it? Or should I need re-install node and npm?
And if I do delete this folder, when I execute npm ls, I would get these errors:
/Users/Username
├─┬ UNMET DEPENDENCY @vue/cli-ui@3.0.1
│ ├─┬ UNMET DEPENDENCY @akryum/winattr@3.0.0
│ │ └── UNMET DEPENDENCY fswin@2.17.1227
│ ├─┬ UNMET DEPENDENCY @vue/cli-shared-utils@3.0.1
│ │ ├── UNMET DEPENDENCY chalk@2.4.1
│ │ ├── UNMET DEPENDENCY execa@0.10.0
│ │ ├─┬ UNMET DEPENDENCY joi@13.6.0
│ │ │ ├── UNMET DEPENDENCY hoek@5.0.4
How to solve this problem?
Now everything is ok after executing npm cache verify
回答1:
module.paths are the paths where NodeJS search for NPM packages; and it actually
doesn't search in your NPM global directory, as you can see.
More info here https://nodejs.org/api/modules.html#modules_loading_from_the_global_folders and here https://nodejs.org/api/modules.html#modules_all_together.
You see that paths because you're executing node -e ... when you are in home directory, the NodeJS simply traverse all node_modules paths to the root.
[ '/Users/Username/node_modules',
'/Users/node_modules',
'/node_modules' ]
Relating to your question: YES you can delete ~/node_modules; probably it's there because you once wrote npm i MODULE without -g flag and your cwd was ~.
来源：https://stackoverflow.com/questions/53497035/why-there-is-a-node-modules-folder-under-my-home-folder