Can't run example code as shown on npm page.

I'm running on Ubuntu.

I'm installing pokersolver like so, while in the directory of my project:

npm install pokersolver

I'm trying to run a file where this is the only line:

var Hand = require('pokersolve').Hand;

This causes a "Can't find module 'pokersolve'" error. I figure it's a type so I've changed it to:

var Hand = require('pokersolver').Hand;

Which causes the following error

/media/E/Storage/Code/project/node_modules/pokersolver/pokersolver.js:16
  class Card {
  ^^^^^

SyntaxError: Unexpected reserved word
    at Module._compile (module.js:439:25)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Module.require (module.js:364:17)
    at require (module.js:380:17)
    at Object.<anonymous> (/media/E/Storage/Code/flopzilla/new_zilla.js:1:74)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)

goldfire / pokersolver

Can't run example code as shown on npm page. #5