Do you fix JS errors that appeared after an upgrade, and which platforms?

Yes, post-upgrade JavaScript breakage is one of the most common reasons stores call us. We cover Magento (Luma and Hyvä), Shopify, WooCommerce, BigCommerce, PrestaShop, OpenCart and custom storefronts. After a platform, theme, or extension upgrade, the usual culprits are changed jQuery/RequireJS versions, removed APIs, or a third-party script that no longer matches the new markup. We diagnose what the upgrade changed and restore the broken JavaScript. See our emergency bug-fixing hub for production-down help.