code: function configureDefaultMode (outputFolder) {
    const logfile = path.join(outputFolder, 'thumbsup.log')
    const stream = fs.createWriteStream(logfile, { flags: 'a' })
    overrideDebugFormat()
    debug.enable('thumbsup:error,thumbsup:warn')
    debug.useColors = () => false
    debug.log = function () {
      const line = util.format.apply(util, arguments) + '\n'
      stream.write(line)
    }
  }
docs: /*
  If --log is not specified, we won't show any detailed log on stdout
  Instead we send all errors to a file for troubleshooting