zsh: command not found: npm

run brew doctor before u start messing with ~/.node and $PATH vars
  1. brew doctor
> brew doctor

Warning: You have unlinked kegs in your Cellar
Leaving kegs unlinked can lead to build-trouble and cause brews that depend on
those kegs to fail to run properly once built. Run `brew link` on these:

  node_modules

> brew link node_modules

Error: Multiple kegs installed to /usr/local/Cellar/node_modules
However we don't know which one you refer to.
Please delete (with rm -rf!) all but one and then try again.

> /usr/local/Cellar/node
  10.11.0 10.10.0
> rf 10.10.0/

Warning: Homebrew's sbin was not found in your PATH but you have installed
formulae that put executables in /usr/local/sbin.
Consider setting the PATH for example like so

  echo 'export PATH="/usr/local/sbin:$PATH"' >> ~/.zshrc

arning: Broken symlinks were found. Remove them with `brew prune`:
  /usr/local/bin/node-debug
  /usr/local/bin/node-gyp
  /usr/local/bin/node-inspector
  /usr/local/bin/npm
  /usr/local/bin/npx

THEN...

a. frantically search github issues pages and try them at random

b. go to nodejs.org/en/download/

if option b, the only clinteraction you'll have to have is maybe

$ sudo chown -R $(whoami) /usr/local/lib

et voilĂ