$ sudo npm install when
$ sudo npm install -g when

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

$ sudo npm update when

Update package globally,

$ npm install -g when

Git clone:

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

$ sudo  npm install -g ./when

when@3.7.8 /usr/lib/node_modules/when

How to remove when package :

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

$ sudo npm uninstall when

Basic Information of when NPM Package: