Use $NODE_PATH if it's set about npm HOT 5 CLOSED

Also, I just saw that a new version of node came out that looks for modules in $PREFIX/lib/node, I just updated nvm to use this for it's $NODE_PATH directory. So if you default to the global $PREFIX based location that will work for me too.

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That's a great idea.

If you run npm with sudo, it'll default to $PREFIX/lib/node. If not, it'll default to $HOME/.node_libraries.

But it would be good to check the $NODE_PATH, and do something smart with it. At the very least, npm should make sure that the --root setting is in the $NODE_PATH, and show some kind of warning if it's not.

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the sudo check doesn't work for my case since my $PREFIX is in my home folder. I imagine others do this too. Maybe try to write to the global library folder and fallback to $HOME/.node_libraries if it's not possible.

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Discussed in IM:

1. When not sudo, use require.paths[0]
2. When sudo, use process.installPrefix+"/lib/node"

This also ensures that the --root config is in the require path.

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Fixed in 9baec09

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