$ sudo npm install opentype.js
$ sudo npm install -g opentype.js

If want to update the opentype.js package execute the command as below,

$ sudo npm update opentype.js

Update package globally,

$ npm install -g opentype.js

Git clone:

$ sudo  git clone https://github.com/rektide/opentype.js.git

$ sudo  npm install -g ./opentype.js

opentype.js@0.7.3 /usr/lib/node_modules/opentype.js

How to remove opentype.js package :

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

$ sudo npm uninstall opentype.js

Basic Information of opentype.js NPM Package: