$ sudo npm install eventsource-polyfill
$ sudo npm install -g eventsource-polyfill

If want to update the eventsource-polyfill package execute the command as below,

$ sudo npm update eventsource-polyfill

Update package globally,

$ npm install -g eventsource-polyfill

Git clone:

$ sudo  git clone https://github.com/rektide/eventsource-polyfill.git

$ sudo  npm install -g ./eventsource-polyfill

eventsource-polyfill@0.9.6 /usr/lib/node_modules/eventsource-polyfill

How to remove eventsource-polyfill package :

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

$ sudo npm uninstall eventsource-polyfill

Basic Information of eventsource-polyfill NPM Package: