lighthouse.js

function generateReport(site, data, type) {
  let promise = new Promise((resolve, reject) => {
    launchChromeAndRunLighthouse(v.url, {output: type})
    .then((data) => {
      data = JSON.stringify(data);
      // timestamep will be used on the filename
      let timeStamp = DateTime.local().toISODate();

      // Directory may not exist yet
      if (!fs.existsSync(`reports/${v.name}`)) {
        fs.mkdirSync(`reports/${v.name}`);
      }

      // Directory may not exist yet
      if (!fs.existsSync(`reports/${v.name}/${type}`)) {
        fs.mkdirSync(`reports/${v.name}/${type}`);
      }

      fs.writeFile(`reports/${v.name}/${v.name}-${timeStamp}.${type}`, data);
    })
    .catch(handleError);
  })
}