code: function (logLevel, args) {
              const time = dateFormat(new Date(), 'dd/mm/yyyy, h:MM:ss.l tt');
              // Each logger can have its own name. If this is
              // not provided, it will default to Unknown.
              const loggerName = __private.name || Constants.LOG_UNKNOWN_APP_ID;
              return [ (logLevel.name.length === 4 ? ' ' : '') +
                  getLogLabel(logLevel)('[' + logLevel.name + ']'), time, '-',
              loggerName.padEnd(Constants.LOG_APP_ID_WIDTH), ':'].concat(Object.values(args));
          }
docs: Internal Utility function to build log messages.