lighthouse.js

const lighthouse = require("lighthouse");
const chromeLauncher = require("chrome-launcher");

function launchChromeAndRunLighthouse(type, page, timestamp, res) {
  const relativePath = `reports/${type}/${page}/${timestamp}.json`;
  let opts = {
    chromeFlags: ["--no-sandbox", "--disable-gpu", "--headless"],
    extraHeaders: { Cookie: "split_tcv=100" }
  };
  let lighthouse_config_accessibilityOnly = {
    extends: "lighthouse:default",
    settings: {
      onlyCategories: ["accessibility"]
    }
  };
  let lighthouse_config;
  if (page === "hp") {
    lighthouse_config = null;
  } else {
    lighthouse_config = lighthouse_config_accessibilityOnly;
  }

  let url = getUrl(type, page);
  return chromeLauncher
    .launch({ chromeFlags: opts.chromeFlags })
    .then(chrome => {
      opts.port = chrome.port;
      return lighthouse(url, opts, lighthouse_config).then(results => {
        delete results.artifacts;
        return chrome.kill().then(() => {
          res.send(results.lhr),
            s3.upload(
              {
                Body: JSON.stringify(results.lhr),
                Bucket: config.bucketName,
                Key: `${relativePath}`
              },
              (err, data) => {
                if (err) console.error(`Upload Error ${err}`);
                else console.log("Upload Completed");
              }
            );
        });
      });
    });
}

module.exports = {
  launchChromeAndRunLighthouse
};