Fix npm ERR! Error: EACCES: permission denied, access '/usr/local/lib/node_modules/npm/node_modules/abbrev'

 Run the following command and it works just fine (tested on OS X) :

sudo npm install --unsafe-perm -g expo-cli

 

For uninstallting expo-cli, following command can be used:

sudo npm uninstall --unsafe-perm -g expo-cli --save