Memory leaks - MaxListenersExceededWarning

Please tell us about your environment:

npm view winston version 3.3.3

What is the problem?

Node will release a warning: MaxListenersExceededWarning

(node:89848) MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 5 uncaughtException listeners added to [process]. Use emitter.setMaxListeners() to increase limit (Use node --trace-warnings ... to show where the warning was created)

What do you expect to happen instead?

No warning

How to reproduce:

`const winston = require(“winston”); const { transports } = require(“winston”);

// const EventEmitter = require(‘events’); // EventEmitter.defaultMaxListeners = 4;

const createLogger = () => { winston.createLogger({ transports: [ new winston.transports.Console({ handleExceptions: true, }), ], exceptionHandlers: [new transports.File({ filename: “exceptions.log” })], }) }

for (let i = 0; i <= 4; i++) { createLogger(); }`

Removing handleExceptions and exceptionHandlers will work and the warning is not shown

[wbt]

The first half was included in yesterday’s release, and I’ve recently merged the second to go out in the next release.

[r4dul]

I think this is fixed by #1824 and/or #1973, though they have not yet been included in a release (hopefully coming soon!)

Also FYI, it’s a warning rather than an error, but the “possible” memory leak referred to is a real one.

Thank you very much for your fast answer.