BJesuiter Default Winston logging config

logger.js

import {createLogger, format, transports} from 'winston';
import * as configService from '../config.service.js';
import {SPLAT} from 'triple-beam';
import jsonColorize from 'json-colorizer';

const {combine, timestamp, printf, colorize} = format;

const jsonColorizeOptions = {
	pretty: true,
	colors: {
		BRACE: 'black',
		BRACKET: 'black',
		COLON: 'black',
		COMMA: 'black',
		STRING_KEY: 'yellow',
		STRING_LITERAL: 'green',
		NUMBER_LITERAL: 'blue',
		BOOLEAN_LITERAL: 'magenta',
		NULL_LITERAL: 'grey.bold'
	}
};

const formatMetadataEntry = entry => {
	let output;
	if (typeof entry === 'string') {
		output = entry;
	}

	if (Array.isArray(entry) || typeof entry === 'object') {
		const metaJson = JSON.stringify(entry, null, '\t');
		output = jsonColorize(metaJson, jsonColorizeOptions);
	}
	return output;
};

const printToConsole = printf(logInfo => {
	let {level, message, timestamp} = logInfo;
	const metaDataArray = logInfo[SPLAT];

	let output;
	if (metaDataArray !== undefined && metaDataArray.length > 0) {
		const mappedMetaData = metaDataArray.map(formatMetadataEntry);
		output = metaDataArray.length === 1 ? mappedMetaData[0] : formatMetadataEntry(mappedMetaData);
	}

	if (message === undefined && metaDataArray === undefined) {
		message = 'No Message';
	}

	if (typeof message === 'object') {
		output = formatMetadataEntry(message);
	}

	return `${timestamp} ${level}: ${message ? message : ''} \n ${output ? output : ''}`;
});

const logger = createLogger({
	level: configService.logLevel,
	format: combine(colorize(), timestamp(), printToConsole)

	// Configure file transports, if needed
	// Note: Console transport will be attached below when not running in production mode
	// transports: [
	// 	//
	// 	// - Write all logs with level `error` and below to `error.log`
	// 	// - Write all logs with level `info` and below to `combined.log`
	// 	//
	// 	new winston.transports.File({ filename: 'error.log', level: 'error' }),
	// 	new winston.transports.File({ filename: 'combined.log' })
	// ]
});

if (process.env.NODE_ENV !== 'production') {
	logger.add(new transports.Console());
}

export default logger;