winston-console-log.js

'use strict';

const winston = require('winston');
//
// Or use `Symbol.for` instead of `triple-beam`:
// - const LEVEL = Symbol.for('level');
// - const MESSAGE = Symbol.for('message');
//
const { LEVEL, MESSAGE } = require('triple-beam');

const logger = winston.createLogger({
  transports: [
    new winston.transports.Console({
      //
      // Possible to override the log method of the
      // internal transports of [email protected].
      //
      log(info, callback) {
        setImmediate(() => this.emit('logged', info));

        if (this.stderrLevels[info[LEVEL]]) {
          console.error(info[MESSAGE]);
      
          if (callback) {
            callback();
          }
          return;
        }
      
        console.log(info[MESSAGE]);
      
        if (callback) {
          callback();
        }
      }
    })
  ]
});

logger.log({
  level: 'info',
  message: 'foo'
});