You’re getting the “Cannot read properties of undefined (reading 'extend')” error because the ProductScreen component isn’t fully defined when you try to extend it. Make sure your custom module waits until ProductScreen is initialized before applying Registries.Component.extend(ProductScreen, ExpiredProductScreen). Also check that your product has the expiry fields (expiry_date, etc.) defined and passed through to the POS so the check logic has data to work with.

Hi,

The error you're encountering, Cannot read properties of undefined (reading 'extend'), occurs because Registries.Component.extend is being applied improperly before the component (ProductScreen) is fully defined. To fix this, ensure that the ProductScreen component is extended only after it is properly initialized. In the code, the component should be extended after defining the ExpiredProductScreen class.

odoo.define('expired_product.ProductScreen', function (require) {

    "use strict";

    const ProductScreen = require('point_of_sale.ProductScreen');

    const Registries = require('point_of_sale.Registries');

    const { _t } = require('web.core');

    const { DateTime } = luxon;

    const ExpiredProductScreen = ProductScreen =>

        class extends ProductScreen {

            async _clickProduct(event) {

                const product = event.detail.product || event.detail;

                console.log('Product clicked:', product);

                // Display expiration_time and expiry_date

                console.log('Expiration Time (Days):', product.expiration_time);

                console.log('Expiry Date:', product.expiry_date);

                // Check if product has expired

                if (this._isProductExpired(product)) {

                    await this._showExpiredProductModal(product);

                    return;

                }

                // If not expired, proceed with normal product selection

                super._clickProduct(event);

            }

            _isProductExpired(product) {

                // Check product expiration

                if (product.expiry_date) {

                    const expirationDate = DateTime.fromISO(product.expiry_date);

                    const today = DateTime.local();

                    return expirationDate < today;

                }

                return false;

            }

            async _showExpiredProductModal(product) {

                const { confirmed } = await this.showPopup('ConfirmPopup', {

                    title: _t('Product Expired'),

                    body: _t(

                        The product "${product.display_name}" has expired on ${DateTime.fromISO(product.expiry_date).toLocaleString(DateTime.DATE_FULL)}. Do you want to continue?

                    ),

                    confirmText: _t('Continue'),

                    cancelText: _t('Cancel'),

                });

                // If user confirms, allow product selection

                if (confirmed) {

                    this.env.pos.get_order().add_product(product);

                }

            }

        };

    // Correctly extend the ProductScreen using Registries

    Registries.Component.extend(ProductScreen, ExpiredProductScreen);

    return ExpiredProductScreen;

});

Additionally, you need to check whether the product has a lot or serial number tracking (via product.tracking) before performing the expiration check, as expiration is only relevant for such products. Also, ensure that product.expiry_date exists before checking for expiration to avoid errors when this field is missing.

Hope it helps