Relative timestamps in winston

logger.js

import winston from 'winston';
import {LOG_PATH} from './env';

let lastLog = new Date();
/**
 * @type {winston.Logger}
 */
export default new winston.Logger({
    transports: [
        new winston.transports.Console({
            prettyPrint: true,
            colorize: true,
            timestamp: () => {
                const current = new Date();
                const difference = current - lastLog;
                lastLog = current;
                return `+${difference}ms`
            },
            level: 'debug',
        }),
        new winston.transports.File({
            filename: LOG_PATH,
            maxsize: 40000,
            maxFiles: 10,
        }),
    ],
});