Log file contains only lots of "undefined"

[fabiante]

Hi, when using the transport like this:

        return new ((winston.transports as any).DailyRotateFile)({
            filename: 'service-%DATE%.log',
            datePattern: 'DD-MM-YYYY',
            dirname: logFolder,
            zippedArchive: false,
            maxSize: '10m',
            maxFiles: '14d'
        });

and a custom winston format:

winston.format.printf(({ level, message, label, timestamp }) => `${timestamp} ${level} [${label}]: ${message}`)

the output log file only contains lots of "undefined"

[mattberther]

printf takes an info object. Perhaps you're looking for:

winston.format.printf(info => `${info.timestamp} ${info.level} [${info.label}]: ${info.message}`)

[fabiante]

I don't think that is my issue. In fact, my callback function uses a deconstructor to receive those properties.

This printf usage does work. I use a console transport along with the transport of this package and my console output is as expected.

Edit: Just tested you version. No difference. That is not the issue

[fabiante]

Sorry, I completely removed my format and used the default one and then it works.