$ sudo npm install phosphor-messaging
$ sudo npm install -g phosphor-messaging

If want to update the phosphor-messaging package execute the command as below,

$ sudo npm update phosphor-messaging

Update package globally,

$ npm install -g phosphor-messaging

Git clone:

$ sudo  git clone https://github.com/rektide/phosphor-messaging.git

$ sudo  npm install -g ./phosphor-messaging

phosphor-messaging@1.0.6 /usr/lib/node_modules/phosphor-messaging

How to remove phosphor-messaging package :

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

$ sudo npm uninstall phosphor-messaging

Basic Information of phosphor-messaging NPM Package: