@optionfactory/ful/dist/ful-client-errors.iife.js

- Import the lib via CDN:

(function () {
    'use strict';

    function ful_report_error(evt) {
        function meta_content(name) {
            var metaEls = document.getElementsByTagName("meta");
            var content = [].slice.call(metaEls).filter(function (v) {
                return v.name === name;
            }).map(function (v) {
                return v.content;
            });
            return content[0];
        }
        function configured_report_uri() {
            var scriptEl = document.querySelector('script[data-report-client-errors-uri]');
            if (!scriptEl) {
                console && console.error && console.error("missing attribute data-report-client-errors-uri");
                return null;
            }
            return scriptEl.dataset['reportClientErrorsUri'];
        }
        function split_stack() {
            if (evt.error && evt.error.stack && evt.error.stack.split) {
                return evt.error.stack.split("\n");
            }
            if (evt.reason && evt.reason.stack && evt.reason.stack.split) {
                return evt.reason.stack.split("\n");
            }
            return undefined
        }
        function message() {
            if (evt.message) {
                return evt.message;
            }
            if (evt.reason && evt.reason.message) {
                return evt.reason.message;
            }
            if (evt.error && evt.error.message) {
                return evt.error.message;
            }
            return undefined;
        }

        var uri = configured_report_uri();
        if (!uri) {
            return;
        }
        var headers = {
            'Content-Type': 'application/json'
        };
        headers[meta_content("_csrf_header")] = meta_content("_csrf");
        try {
            fetch(uri, {
                method: 'POST',
                mode: 'same-origin',
                cache: 'no-cache',
                credentials: 'same-origin',
                headers: headers,
                redirect: 'error',
                referrerPolicy: 'no-referrer-when-downgrade',
                body: JSON.stringify({
                    page: window.location && window.location.href ? window.location.href : "unknown",
                    filename: evt.filename,
                    line: evt.lineno,
                    col: evt.colno,
                    message: message(),
                    stack: split_stack()
                })
            });
        } catch (e) {
            //nothing to do here
        }
    }

    window.addEventListener('error', ful_report_error);
    window.addEventListener('unhandledrejection', ful_report_error);

})();
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