src/Logger.js

const winston = require('winston');
const config = require('./config');

const customConfig = {
    levels: {
        error: 0,
        debug: 1,
        warn: 2,
        data: 3,
        info: 4,
        verbose: 5,
        silly: 6,
        custom: 7,
    },
    colors: {
        error: 'red',
        debug: 'blue',
        warn: 'yellow',
        data: 'grey',
        info: 'green',
        verbose: 'cyan',
        silly: 'magenta',
        custom: 'yellow',
    },
};

/**
 * @public
 * Logger class, which allows us to log with colors.
 */
class Logger {
    /**
     * @constructor
     * @description adds the color palette to the winston module.
     */
    constructor() {
        winston.addColors(customConfig.colors);
    }

    /**
     * @description initializes winston.
     * @returns {Logger}
     */
    init() {
        return winston.createLogger({
            levels: customConfig.levels,
            format: winston.format.combine(
                winston.format.colorize(),
                winston.format.simple(),
            ),
            transports: [
                new winston.transports.Console(),
            ],
            level: (config.verbose) ? 'custom' : 'info',
        });
    }

}

module.exports = new Logger().init();