thing to understand the winston logging levels and formatter

index.js

const w = require('winston')
const chalk = require('chalk');
w.level = 'silly';

w.error('error log')
w.warn('warn log')
w.info('info log')
w.verbose('verbose log')
w.debug('debug log')
w.silly('silly log')


var formatterFunc = function (options) {
  return `${chalk.bold['red']('events module')} [${w.config.colorize(options.level, options.level)}] ${options.message}`
};


const l = new (w.Logger)({
  transports: [
    new (w.transports.Console)({
      colorize: true,
      level: 'silly',
      showLevel: true,
      formatter: formatterFunc
      // formatter: function (options) {
      //   return '>>>>' + options.message + (options.meta.postfix || '<<<<')
      // }
    })
  ],
  // rewriters: [(level, msg, meta) => { return '||||' + msg + '@@@@@' }],
  // filters: [(level, msg, meta) => { return '||||' + msg + '@@@@@' }],
  // filters:   [(level, msg, meta) => { /* etc etc */ }]
});
console.log('-----')
// l.level = 'silly';
l.error('error log')
l.warn('warn log')
l.info('info log')
l.verbose('verbose log')
l.debug('debug log')
l.silly('silly log', 'wasda', 'wasd')
l.log('error', 'this is a log message')