CODEWITHSUNDEEP
javascriptloggingwinston
Jakub
Jakub

Reputation: 2719

Winston logger error logger.default.warn is not a function

I added Winston logger to my JS application and all the logs work but not the warning. I have no idea why.

The error every time I try to use .warn(warning) as

TypeError: _logger.default.warn is not a function

My logger was done in this helper utility

import { config, createLogger, format, transports } from 'winston';

const { printf, combine, timestamp, colorize } = format;

// don't show console logs in test mode
const transport =
  process.env.NODE_ENV !== 'test' ? [new transports.Console()] : [];

export default createLogger({
  levels: config.syslog.levels,
  level: 'info',
  format: combine(
    timestamp(),
    printf((info) => `[${info.timestamp}][${info.level}]: ${info.message}`),
    colorize({ all: true })
  ),
  transports: [
    ...transport,
    new transports.File({ filename: 'logs/error.log', level: 'error' }),
    new transports.File({ filename: 'logs/application.log' }),
  ],
});

and I used just under an if statement

if ( validation === 'false' ) {
    log.warn('Twilio validation is not active!'); // Here the error occur
    return next();
  }

I tried to google online but as per documentation should work so I don't know what's wrong as it is the only log not working.

Upvotes: 1

Views: 1549

Answers (1)

lbsn
lbsn

Reputation: 2412

createLogger() creates the log level methods based on the levels object in the options. In config.syslog.levels the level is called warning not warn.

So the method to call should be: log.warning('Twilio validation is not active!');

There is an open issue requesting to implement warn() as a convenient method for syslog warning level.

Upvotes: 1

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