blockResource.js

const blockedResources = [
    "google-analytics.com",
    "cloudflareinsights.com",
    "googletagmanager.com",
    "api.mixpanel.com",
    "fonts.googleapis.com",
    "stats.g.doubleclick.net",
    "mc.yandex.ru",
    "use.typekit.net",
    "beacon.tapfiliate.com",
    "js-agent.newrelic.com",
    "api.segment.io",
    "woopra.com",
    "static.olark.com",
    "static.getclicky.com",
    "fast.fonts.com",
    "youtube.com/embed",
    "cdn.heapanalytics.com",
    "googleads.g.doubleclick.net",
    "pagead2.googlesyndication.com",
    "fullstory.com/rec",
    "navilytics.com/nls_ajax.php",
    "log.optimizely.com/event",
    "hn.inspectlet.com",
    "tpc.googlesyndication.com",
    "partner.googleadservices.com",
    ".ttf",
    ".eot",
    ".otf",
    ".woff",
    ".gif",
    ".tiff",
    ".pdf",
    ".ico",
    ".svg"
];

module.exports = {
    tabCreated: (req, res, next) => {
        req.prerender.tab.Network.setRequestInterception({
            patterns: [{urlPattern: '*'}]
        }).then(() => {
            next();
        });

        req.prerender.tab.Network.requestIntercepted(({interceptionId, request}) => {

            let shouldBlock = false;
            blockedResources.forEach((substring) => {
                if (request.url.indexOf(substring) >= 0) {
                    console.log(`Blocking ${request.url}`);
                    shouldBlock = true;
                }
            });

            let interceptOptions = {interceptionId};

            if (shouldBlock) {
                interceptOptions.errorReason = 'Aborted';
            }

            req.prerender.tab.Network.continueInterceptedRequest(interceptOptions);

        });
    }
};