Colorized logger of winston@3.x (boilerplate)

logger.js

const process = require('process');
const winston = require('winston');
const clc = require('cli-color');

const { 
  TERM = '',
  LOG_LEVEL = 'info'
} = process.env;

const colors = ~TERM.indexOf('256') ? {
  silly: clc.xterm(33),
  debug: clc.xterm(207),
  info: clc.xterm(48),
  warn: clc.xterm(226),
  error: clc.xterm(196),
  verbose: clc.xterm(8),
} : {
  silly: clc.blue,
  debug: clc.cyan,
  info: clc.green,
  warn: clc.yellow,
  error: clc.red,
  verbose: clc.white,
};

const logger = winston.createLogger({
  level: LOG_LEVEL,
  transports: [
    new winston.transports.Console({
      format: winston.format.combine(
        winston.format.splat(),
        winston.format.timestamp(),
        winston.format.printf(
          ({ level, message, timestamp }) =>
            colors[level](`${timestamp} [${level.toUpperCase()}] ${message}`)
        ),
      ),
    }),
  ]
});

logger.colors = colors;
module.exports = logger;