[Winston Log to file and console just like NodeJS] #NodeJS #Winston #console #log

winston-nodejs-console.js

const util = require('util')
const path = require( 'path' )
const winston = require( 'winston' );
const { createLogger, transports, format } = winston
const { Console, File } = transports
const { timestamp  } = format

// Adapted from https://github.com/winstonjs/winston/issues/1427
const commonConfig = {
    handleExceptions: true,
    format: format.combine(
        timestamp(),
        {
            transform (info) {
                const { timestamp, message } = info;
                const level = info[Symbol.for('level')];
                const args = [message, ...(info[Symbol.for('splat')] || [])];  // join the args back into one arr
                info.message = args;  // for all custom transports (mainly the console ones)
                let msg = args.map(e => {
                    if (e.toString() === '[object FileList]')
                        return util.inspect(e.toArray(), true, 10);
                    else if (e.toString() === '[object File]')
                        return util.inspect(e.toObject(), true, 10);
                    else if (e.toString() === '[object Object]') {
                        return util.inspect(e, true, 5);
                    }
                    else if (e instanceof Error)
                        return e.stack
                    else
                        return `${e}`;
                }).join(' ');

                info[Symbol.for('message')] = `${timestamp}|${level}|${msg}`; // for inbuild transport / file-transport

                return info;
            },
        },
    ),
}
const logger = createLogger(
    {
        level: 'debug',
        levels: {
            error: 0,
            warn: 1,
            info: 2,
            debug: 3
        },
        transports: [
            new Console({
                ...commonConfig,
                format: commonConfig.format,
            }),
            new File( {
                ...commonConfig,
                format: commonConfig.format,
                dirname: path.join( __dirname ),
                filename: 'audit.log',
            } )
        ],
    }
)


console.error = function () {
    return logger.error.apply( logger, [...arguments] )
}
console.warn = function () {
    return logger.warn.apply( logger, [...arguments] )
}
console.info = function () {
    return logger.info.apply( logger, [...arguments] )
}
console.log = function () {
    return logger.info.apply( logger, [...arguments] )
}
console.debug = function () {
    return logger.debug.apply( logger, [...arguments] )
}

console.log(   'log: some stuff =', JSON.stringify( { msg: 'hello' }, null, 4 ), 'more', { nothing: 'here' })
console.info(  'info: some stuff =', JSON.stringify( { msg: 'hello' }, null, 4 ), 'more', { nothing: 'here' })
console.error( 'error: some stuff =', JSON.stringify( { msg: 'hello' }, null, 4 ), 'more', { nothing: 'here' })
console.warn(  'warn: some stuff =', JSON.stringify( { msg: 'hello' }, null, 4 ), 'more', { nothing: 'here' })
console.debug( 'debug: some stuff =', JSON.stringify( { msg: 'hello' }, null, 4 ), 'more', { nothing: 'here' })

console.debug( 'debug: some stuff =', new Error('boom'))