Error

[zombiestruck]

When running the code sample I get an error:
TypeError: RFID is not a constructor
It occurs at the second line in my code which is the sample code is thus:

var RFID = require('@ulfalfa/rfid-chafon');
 
let rfid = new RFID('/dev/ttyUSB0');
 
rfid.open()
    .then(() => {
        return rfid.read().then(result => {
            console.log(result);
            rfid.close();
        });
    }).catch(e => {
        console.error(e);
        rfid.close();
    });```