Hi,

Try this code,
/** @odoo-module */

import { patch } from "@web/core/utils/patch";
import { PosDB } from "@point_of_sale/app/store/db";

patch(PosDB.prototype, {
});

Hope it helps

To ensure that your JavaScript customization is properly referenced and included in the Point of Sale (POS) module in Odoo,Check File Structure: Ensure your JavaScript file is located in the correct directory
  In Odoo 17, the structure for JavaScript customization has been changed like this 

import { useListener } from "@web/core";

import { PosDB } from "point_of_sale.DB";

useListener('pos_search_limit', () => {

    PosDB.include({

        _search: function(query, options){

            options = options || {};

            options.limit = 10; // Set the limit to 10

            return this._super(query, options);

        },

    });

});

Hello,

You have to update your code according odoo 17 code structure, please check pos module from enterprise for reference.