woocommerce-paypal-payments/modules/ppcp-compat/resources/js/tracking-compat.js

document.addEventListener(
    'DOMContentLoaded',
    () => {
        const config = PayPalCommerceGatewayOrderTrackingCompat;

        const orderTrackingContainerId = "ppcp_order-tracking";
        const orderTrackingContainerSelector = "#ppcp_order-tracking .ppcp-tracking-column.shipments";
        const gzdSaveButton = document.getElementById('order-shipments-save');
        const loadLocation = location.href + " " + orderTrackingContainerSelector + ">*";
        const gzdSyncEnabled = config.gzd_sync_enabled;
        const wcShipmentSyncEnabled = config.wc_shipment_sync_enabled;
        const wcShipmentSaveButton = document.querySelector('#woocommerce-shipment-tracking .button-save-form');

        const toggleLoaderVisibility = function() {
            const loader = document.querySelector('.ppcp-tracking-loader');
            if (loader) {
                if (loader.style.display === 'none' || loader.style.display === '') {
                    loader.style.display = 'block';
                } else {
                    loader.style.display = 'none';
                }
            }
        }

        const waitForTrackingUpdate = function (elementToCheck) {
            if (elementToCheck.css('display') !== 'none') {
                setTimeout(() => waitForTrackingUpdate(elementToCheck), 100);
            } else {
                jQuery(orderTrackingContainerSelector).load(loadLocation, "", function(){
                    toggleLoaderVisibility();
                });
            }
        }

        if (gzdSyncEnabled && typeof(gzdSaveButton) != 'undefined' && gzdSaveButton != null) {
            gzdSaveButton.addEventListener('click', function (event) {
                toggleLoaderVisibility();
                waitForTrackingUpdate(jQuery('#order-shipments-save'));
            })
        }

        if (wcShipmentSyncEnabled && typeof(wcShipmentSaveButton) != 'undefined' && wcShipmentSaveButton != null) {
            wcShipmentSaveButton.addEventListener('click', function (event) {
                toggleLoaderVisibility();
                waitForTrackingUpdate(jQuery('#shipment-tracking-form'));
            })
        }
    },
);