[IMP] convert to native javascript module

pos_auto_invoice_default_partner/static/src/js/Screens/PaymentScreen/PaymentScreen.esm.js

@@ -0,0 +1,20 @@
+/** @odoo-module **/
+
+import PaymentScreen from "point_of_sale.PaymentScreen";
+import Registries from "point_of_sale.Registries";
+
+const InvoiceDefaultPartnerPaymentScreen = (OriginalPaymentScreen) =>
+    class extends OriginalPaymentScreen {
+        async validateOrder() {
+            const partner = this.currentOrder.get_partner();
+            const default_partner_id = this.env.pos.config.default_partner_id;
+            if (this.currentOrder.is_to_invoice() && !partner && default_partner_id) {
+                this.currentOrder.set_partner(
+                    this.env.pos.db.get_partner_by_id(default_partner_id[0])
+                );
+            }
+            return super.validateOrder(...arguments);
+        }
+    };
+
+Registries.Component.extend(PaymentScreen, InvoiceDefaultPartnerPaymentScreen);