Odoo 10 - Extend a Javascript of point of sale Module

i want to override a ReceiptScreen method from point_of_sale module.

var ReceiptScreenWidget = ScreenWidget.extend...

gui.define_screen({name:'receipt', widget: ReceiptScreenWidget});

In order to do this, i've created my own module but i don't know what steps follow to change the ReceiptScreenWidget.print() function.

Here is the screens.js that contains the Widget.Function that i want to override. (search for: ReceiptScreenWidget)

I tried to follow this example but the code is from Odoo 8 or 9 so i couldn't make it work.

*Odoo version: 10