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Fixing npm On Mac OS X for Homebrew Users

If you just want to fix the issue quickly, scroll down to the "solution" section below.

Explanation of the issue

If you're a Mac Homebrew user and you installed node via Homebrew, there is a major philosophical issue with the way Homebrew and NPM work together. If you install node with Homebrew and then try to do npm update npm -g, you will see an error like this:

$ npm update npm -g