I am working on a module making something when any change happens in the product grid in the POS screen 

this is my code 

/** @odoo-module **/
const ProductScreen = require('point_of_sale.ProductScreen');
const Registries = require('point_of_sale.Registries');
const { Gui } = require('point_of_sale.Gui');


export const ChangePOSGrid = (ProductScreen) =>
  class extends ProductScreen {
       //@override
        async _onClickPay() {
           console.log('Code here');
        }
}
Registries.Component.extend(ProductScreen, ChangePOSGrid);

In this code, I already catch the Pay Button click event
but I need to catch the product list change event

how to do this can anyone help me?