In Odoo 18 I try to use orm to call a method from python level with POS JavaScript  put it not working when I am in PosOrder file 

I try this code 

import { PosOrder } from "@point_of_sale/app/models/pos_order";
import { patch } from "@web/core/utils/patch";
import { useService } from "@web/core/utils/hooks";

patch(PosOrder.prototype, {
    setup() {
        super.setup(...arguments);
        this.orm = useService('orm');
    },
})

put it not working, I do not whey this working when I make any other pos prototype files 
I got this error 

TypeError: Cannot read properties of null (reading 'component')

    at useComponent (point_of_sale.assets_prod.min.js:1059:44)

    at useService (point_of_sale.assets_prod.min.js:7979:137)

    at Proxy.setup (point_of_sale.assets_prod.min.js:16608:528)

    at create (point_of_sale.assets_prod.min.js:9253:26)

    at Proxy.create (point_of_sale.assets_prod.min.js:9266:387)

    at Proxy.createNewOrder (point_of_sale.assets_prod.min.js:10181:224)

    at Proxy.createNewOrder (point_of_sale.assets_prod.min.js:16582:828)

    at Proxy.add_new_order (point_of_sale.assets_prod.min.js:10183:18)

    at Proxy.afterProcessServerData (point_of_sale.assets_prod.min.js:10125:331)

    at Proxy.afterProcessServerData (point_of_sale.assets_prod.min.js:16202:465)

and I also try 

const orm = this.env.services.orm;

and also not working 
can any one help me on this