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Got MaxListenersExceededWarning while using winston.

See original GitHub issue

I got a warning message while using winston@3.0.0-rc5 after calling the createLogger function multiple times in my test cases.

(node:28754) MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 end listeners added. Use emitter.setMaxListeners() to increase limit
    at _addListener (events.js:280:19)
    at DerivedLogger.addListener (events.js:297:10)
    at DerivedLogger.Readable.on (_stream_readable.js:772:35)
    at DerivedLogger.once (events.js:341:8)
    at DerivedLogger.Readable.pipe (_stream_readable.js:580:9)
    at DerivedLogger.add (/Users/NS/yk/node_modules/winston/lib/winston/logger.js:299:8)
    at DerivedLogger.<anonymous> (/Users/NS/yk/node_modules/winston/lib/winston/logger.js:82:12)
    at Array.forEach (<anonymous>)
    at DerivedLogger.Logger.configure (/Users/NS/yk/node_modules/winston/lib/winston/logger.js:81:24)
    at DerivedLogger.Logger (/Users/NS/yk/node_modules/winston/lib/winston/logger.js:22:8)
    at new DerivedLogger (/Users/NS/yk/node_modules/winston/lib/winston/create-logger.js:24:44)
    at Object.module.exports [as createLogger] (/Users/NS/yk/node_modules/winston/lib/winston/create-logger.js:58:10)

Issue Analytics

State:
Created 5 years ago
Comments:23 (12 by maintainers)

Top GitHub Comments

4reactions

Acionyxcommented, Jun 22, 2018

Problem still exists for DailyRotateFile. Code above is enough to reproduce issue.

3reactions

Acionyxcommented, Jun 22, 2018

Yep. My case: I’m trying to label messages from different modules with winston 3.0, e.g. [DB] Connected ok, [Main] Server started ok. So what i want to do, is simple call on the top of file, like this: const logger = createNamedLogger('Main');, where createNamedLogger is my wrapper to create logger with labeled Console and File transports.

I tried to find easy way to do such trivial thing, but i did not found it in docs.

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