Attempt to write logs with no transports.

Please tell us about your environment:

• winston version?
  • winston@2
  • winston@3
• node -v outputs:
• _Operating System? Linux
• _Language? ES6/7

What is the problem?

Attempt to write logs with no transports on console.

[winston] Attempt to write logs with no transports {"message":"Hey man, I am here!","level":"debug"}
[winston] Attempt to write logs with no transports {"message":"App running on 3000","level":"info"}

What do you expect to happen instead?

Expect to write on console and combined.log and error.log files.

Other information

logger.js

import winston from 'winston'

const logger = winston.createLogger({
  level: 'info',
  format: winston.format.json(),
  transports: [
    //
    // - Write to all logs with level `info` and below to `combined.log` 
    // - Write all logs error (and below) to `error.log`.
    //
    new winston.transports.File({ filename: 'error.log', level: 'error' }),
    new winston.transports.File({ filename: 'combined.log' }),
    new winston.transports.Console({ format: winston.format.json() })
  ]
})

winston.info('Hey man, I am here!')

export default logger

Usage on index.js

require('./lib/logger.js')
winston.info(`App running on ${port}`)

Obeservation error and combined.log has permission 777 event through is not the ideal.

[lkashef]

@lukaswilkeer, Assuming that createLogger doesn’t already add the logger/stream to winston, just merely construct the logger.

Based on your code snippet, adding winston.add(logger) after you create your logger should solve the problem.

You could also add more streams, loggers and once you require winston in any part of the application, it should return the configured logger.

[lukaswilkeer]

1. It’s not a permission issue, actually I give the 777 to combined and error.log to be sure.
2. Imports are correctly.
3. Winston is up-to-date.
4. I’m following the official example.

I created a repro script and winston works correctly. The problem where Uncaught errors inside the application. (Not reported or proper winston error). Don’t know the root cause. In this case, winston.add(logger) solved the problem of transports.

Closed issue.