A logger that is similar to console.log but log to file, for NodeJS

log-to-file.js

/**
 * Usage: 
 *   const {logger} = require('./log-to-file')
 *   logger.log('something')
 */
const path = require('path');
const fs = require('fs');

const FILE_PATH = path.resolve(__dirname, 'default.log');

const stream = fs.createWriteStream(FILE_PATH, { flags: 'a', encoding: 'utf8' });

function log(level, ...content) {
	console[level](...content);
	const timestamp = new Date().toISOString();
	const message = content
		.map(contentItem => {
			if (contentItem instanceof Error) {
				return `${contentItem.message}\n${contentItem.stack}\n`;
			} else if (typeof contentItem === 'string') {
				return contentItem;
			} else {
				try {
					return JSON.stringify(contentItem, null, 2);
				} catch (e) {
					return contentItem;
				}
			}
		})
		.join(' ');
	stream.write(`${timestamp} [${level}]: ${message}\n`);
}

module.exports = {
	logger: {
		log: log.bind(null, 'log'),
		info: log.bind(null, 'info'),
		warn: log.bind(null, 'warn'),
		debug: log.bind(null, 'debug'),
		error: log.bind(null, 'error'),
	},
};