loggerhythm

Loggerhythm

A winston-wrapper to log in a debug-like manner including namespaces

Usage

Loggerhythm exports a Logger-class, whose instances have different log-functions for different log-levels. the avaliable loglevels are:

1. error
2. warn
3. info
4. verbose

error logs to stderr, everything else logs to stdout!

Example

const Logger = require('loggerhythm').Logger;
// import {Logger} from 'loggerhythm'; // for TypeScript

const logger = new Logger('readme-namespace');
// alias: logger = logger.createLogger('readme-namespace');

logger.info('foo');

The output would look like this (the different log-leves use different colors):

2016-08-30T14:06:33.751Z - info:     [readme-namespace] foo
2016-08-30T14:06:33.752Z - warn:     [readme-namespace] bar

Methods

Static

The Logger-Class has static methods, that can be used to globally set loggerhythm-config and register global log-hooks:

const Logger = require('loggerhythm').Logger;
// import {Logger, LogLevel} from 'loggerhythm'; // for TypeScript

// get informed about all Logs everywhere
const subscription = Logger.subscribe((logLevel, namespace, message, ...logObjects) => {
  // do stuff
});

// do stuff

// unsubscribe
subscription.dispose();

Instance-methods

The Instances of the Logger-class have a log-method for every loglevel and a subscribe-method to get informed about logs of that instance

const Logger = require('loggerhythm').Logger;
// import {Logger} from 'loggerhythm'; // for TypeScript

const logger = Logger.createLogger('readme-namespace');

// get informed about all the logs of that instance
const subscription = Logger.subscribe((logLevel, namespace, message, ...logObjects) => {
  // namespace will always be 'readme-namespace' here
  // do stuff
});

logger.error('error-log', new Error('hello'));
logger.warn('warning-log');
logger.info('have some info', {v1: 1, v2: 2, test: ['some', 'test', 'array']});
logger.verbose('some', 'more detailed', 'info');

// this loggers namespace will be 'readme-namespace:child-logger-lamespace'
const logger2 = logger.createChildLogger('child-logger-lamespace');

// do stuff

// unsubscribe
subscription.dispose();