$ sudo npm install xtend
$ sudo npm install -g xtend

If want to update the xtend package execute the command as below,

$ sudo npm update xtend

Update package globally,

$ npm install -g xtend

Git clone:

$ sudo  git clone https://github.com/rektide/xtend.git

$ sudo  npm install -g ./xtend

xtend@4.0.1 /usr/lib/node_modules/xtend

How to remove xtend package :

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

$ sudo npm uninstall xtend

Basic Information of xtend NPM Package: