$ sudo npm install postcss-extend
$ sudo npm install -g postcss-extend

If want to update the postcss-extend package execute the command as below,

$ sudo npm update postcss-extend

Update package globally,

$ npm install -g postcss-extend

Git clone:

$ sudo  git clone https://github.com/rektide/postcss-extend.git

$ sudo  npm install -g ./postcss-extend

postcss-extend@1.0.5 /usr/lib/node_modules/postcss-extend

How to remove postcss-extend package :

You can uninstall or remove this package from your node_modules run the command as below,

$ sudo npm uninstall postcss-extend

Basic Information of postcss-extend NPM Package: