Adding a library in Laravel
To add with npm the library needs to be included and compiled with Webpack
Here is an example with Moment.js
get the package (this will put in a dependency in package.json)
npm install moment
install
npm install
call it in the laravel mix
/resources/js/app.js
moment = require('moment');
compile it for the env
npm run dev
or
npm run production
More info about mix