Saylo

Saylo is a slim logging helper that wraps the standard console and adds timestamped output. It ships a couple of preconfigured loggers and a tiny factory so you can decide—per environment—which levels should print and which ones should stay silent.

Installation

npm install saylo

Quick start

import chattyLogger, { logger, silentLogger, createLogger } from 'saylo';

chattyLogger.log('Everything is enabled by default');
chattyLogger.debug('Debug output includes a timestamp and level tag');

logger.log('Only log/info/warn/error are enabled here (debug is muted)');

silentLogger.log('This will not print');

const LOGGER_LOG = process.env.LOGGER_LOG === '1';
const LOGGER_DEBUG = process.env.LOGGER_DEBUG === '1';
const appLogger = createLogger({ LOGGER_LOG, LOGGER_DEBUG });

appLogger.log('Respects LOGGER_LOG');
appLogger.debug('Respects LOGGER_DEBUG');

Each message is prefixed with a timestamp in the [YYYY-MM-DD HH:mm:ss] [LEVEL] form.

API

createLogger(options?)

createLogger({
  LOGGER_LOG: boolean;   // defaults to true – controls log/info/warn/error
  LOGGER_DEBUG: boolean; // defaults to true – controls debug (and info if you want it chatty)
}) => Logger

Disabled levels simply map to a no-op (() => undefined), so calling them is cheap.

Logger methods

• log(message, ...meta)
• debug(message, ...meta)
• info(message, ...meta)
• warn(message, ...meta)
• error(message, ...meta)

All methods mirror console.* semantics: they accept any extra arguments and pass them straight through to the console.

Built-in instances

• chattyLogger (default export) – log, debug, info, warn, error all enabled.
• logger – log/info/warn/error enabled, debug muted.
• silentLogger – everything muted.

Because the factory is tiny you can create as many bespoke loggers as you like, with whatever combination of flags or wrapping logic you need.

Tips

• Pipe environment variables (LOGGER_LOG, LOGGER_DEBUG) into createLogger if you want to control output without touching call sites.
• Timestamp helpers live in src/funcs.ts; swap them if you prefer different formatting.
• There’s no buffering or transport layer—if you need to wire the logger into another system, just wrap the functions returned by createLogger.

License

MIT