[Bug]: Allow configuring formats per-exceptionHandler-transport within the same logger

[NazCodeland]

🔎 Search Terms

logging to two files with two different formats

The problem

I am trying to log to two different files with two different formats for the same logging severity level. Very similar to issue #1401 however, instead of formats within a regular transport, it's about formats within exceptionHandler transports.

What version of Winston presents the issue?

v3.8.2

What version of Node are you using?

v19.1.0

If this worked in a previous version of Winston, which was it?

No response

Minimum Working Example

This is what I have tried,

const fileNames = {
	exception: "./src/logger/logs/exceptions.json",
	exceptionReadable: "./src/logger/logs/exceptionReadable.log",
	}
	
const exceptionHandlers = [
	new winston.transports.File({ filename: fileNames.exception, format: json() }),
	new winston.transports.File({ filename: fileNames.exceptionReadable }),
];

const readableLogFormat = winston.format.printf(({ timestamp, level, message, stack }) => {
	return `${timestamp} ${level.toUpperCase()} ${stack || message}\n`;
});

const logger = winston.createLogger({
	level: process.env.LOG_LEVEL,
	format: combine(winston.format.errors({ stack: true }), timestamp(),  readableLogFormat),
	transports: transports,
	exceptionHandlers: exceptionHandlers,
});

Additional information

So, I have the readableLogFormat for all logs, and within the first "File" transport inside "exceptionHandlers", I've specified the json() format, but it doesn't work. In both files, I get the output of "readableLogFormat". This same exact thing works, specifying a format, for a regular "transports" but not when the format is inside a "exceptionHandlers" transport.

Anyone know why that is, or what am I doing incorrect?

Thanks in advance.