As you know default behavior of winston logger is to log all the messages which have at least the specifies importance aka logging level. But i want to completely separate log files.

For example:

logger.error("error happened") ->naturally this logs to all level log files. according to my requirements this must only log to error log file. not to debug log file.

I have found some tricks to overcome this behavior. As a solution using customTransform implementation suggested. But the suggested implementation was for a single console logger transform (here)

These are my transports.

var transportError = new winston.transports.DailyRotateFile({
  filename: frontendErrorLogFile,
  level: "error"
  });
var transportApi = new winston.transports.DailyRotateFile({
  filename: frontendApiLogFile,
  level: "info"
  });

var logger = winston.createLogger({
    transports: [
      transport,
      transportError,
      transportApi
    ]
});

Could you please help me in designing a custom transport for two DailyRotateFile's.