Search source codeof a webpage, including it's linked stylesheets and scripts.

shallowSourceSearch.js

/**
 * Used to find function names or any other strings in sources of a web page.
 * @param {string} needle - The string to find
 * @param {boolean} caseMatch - Is search case sensitive?
 */
async function shallowSourceSearch(needle, caseMatch = false) {
    var matches = [], files = [];
    if (!caseMatch) needle = needle.toLowerCase();
    const searchFile = async path => {
        try {
            var source = await fetch(path).then(r => r.text());
            if (!caseMatch) source = source.toLowerCase();
            for (var lines = source.split("\n"), i = lines.length; i--;) {
                var match = lines[i].indexOf(needle);
                if (match > -1) {
                    matches.push({
                        file: path,
                        line: i,
                        position: match,
                        context: lines[i]
                    });
                }
            }
        } catch (e) {}
    };
    files.push(location.href);
    var links = [...document.querySelectorAll('link')].map(l => l.href).filter(l => !!l);
    var scripts = [...document.querySelectorAll('script')].map(s => s.src).filter(s => !!s);
    files.push(...links, ...scripts);
    await Promise.all(files.map(path => searchFile(path)));
    return matches;
}