newsupernova/vendor/magento/module-ui/view/base/templates/logger.phtml

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
// @codingStandardsIgnoreFile
?>
<?php /** @var $block \Magento\Ui\Block\Logger */ ?>
<?php if ($block->isLoggingEnabled()): ?>
    <script>
        window.onerror = function(msg, url, line) {
            var key = "<?= /* @escapeNotVerified */ $block->getSessionStorageKey() ?>";
            var errors = {};
            if (sessionStorage.getItem(key)) {
                errors = JSON.parse(sessionStorage.getItem(key));
            }
            if (!(window.location.href in errors)) {
                errors[window.location.href] = [];
            }
            errors[window.location.href].push("error: \'" + msg + "\' " + "file: " + url + " " + "line: " + line);
            sessionStorage.setItem(key, JSON.stringify(errors));
        };
    </script>
<?php endif; ?>