Fix Multiple npm version conflict issue globally in system

Fix Multiple npm version conflict issue

--- If you have multiple npm versions globally in system it causes problem in compilation of projects , make sure you have a stable version in your system ---

*** Multiple npm version conflict issue can occur if you took an update when npm update warning comes in terminal while working ***

note : Use nvm globally to manage node versions in system, if you don't have nvm then install nvm first by following step from this gist https://gist.github.com/RidaRidss/165c2ea31c8de1089e22495f315c7247


"Open terminal & run commands"

1. sudo chown -R $(whoami) ~/.npm
2. nvm alias default v12.18.2     (in my case i had to fix this version globally)
3. nvm use v12.18.2      
4. nvm use v12.18.2 system 
5. sudo npm cache clean --f