@cyca/log

A lightweight, feature-rich logging library for JavaScript/TypeScript applications that works seamlessly in both browser and Node.js environments.

Features

• 🎨 Colored console output with Unicode symbols
• 📱 Dual environment support - Browser (localStorage) and Server (memory)
• 🔧 Configurable log levels with persistent storage
• 🏗️ Hierarchical loggers with named instances
• 🎛️ Custom console implementations
• 📦 TypeScript support with full type definitions
• 🚀 Modern ES modules with tree-shakeable exports

Installation

npm install @cyca/log

yarn add @cyca/log

pnpm add @cyca/log

bun add @cyca/log

Quick Start

Basic Usage

import { log } from '@cyca/log';

// Simple logging
log.info('Application started');
log.warn('This is a warning');
log.error('Something went wrong');

// Different environments automatically detected:
// - Browser: uses localStorage for persistence
// - Server: uses in-memory storage

Log Levels

The library supports six log levels:

• trace - Most verbose, typically for debugging
• debug - Debug information
• info - General information (default)
• warn - Warning messages
• error - Error messages
• silent - Disable all logging

import { log } from '@cyca/log';

log.trace('Detailed debugging info');
log.debug('Debug information');
log.info('General information');
log.warn('Warning message');
log.error('Error message');

// Set minimum log level
log.setLevel('warn');

Named Loggers

Create hierarchical loggers for different parts of your application:

import { log } from '@cyca/log';

const apiLogger = log.getLogger('api');
const dbLogger = log.getLogger('database');
const authLogger = log.getLogger('auth');

// Different loggers can have different levels
apiLogger.setLevel('debug');
dbLogger.setLevel('error');

// Usage
apiLogger.debug('API request received');
dbLogger.error('Database connection failed');
authLogger.info('User authenticated');

Persistent Log Levels

Log levels are automatically persisted:

import { log } from '@cyca/log';

// Set log level (persisted across sessions)
log.setLevel('error');

// Reset to default
log.resetLevel();

// Set default level (only if no stored level exists)
log.setDefaultLevel('info');

Custom Console Implementation

Use a custom console implementation:

import { log } from '@cyca/log';
import electronLog from 'electron-log/renderer';

log.use(electronLog);

Advanced Usage

TypeScript Support

Full TypeScript definitions are included:

import { log, Logger, LogLevel, LoggerInstance } from '@cyca/log';

const logger: LoggerInstance = log.getLogger('myModule');

// Logger instances extend the standard Console interface
logger.assert(condition, message);
logger.clear();
logger.table(data);

Environment Detection

The library automatically detects the environment:

• Browser: Uses localStorage for persistence and CSS-styled console output
• Node.js: Uses in-memory storage and ANSI color codes

API Reference

Main Exports

• log - Default logger instance
• Logger - Main logger class
• LogLevel - Log level type
• LoggerInstance - Logger instance type
• IStorage - Storage interface
• LoggerOptions - Logger configuration options

Logger Methods

class Logger {
  // Log methods (automatically bound based on level)
  trace(...args: any[]): void
  debug(...args: any[]): void
  info(...args: any[]): void
  warn(...args: any[]): void
  error(...args: any[]): void

  // Level management
  setLevel(level: LogLevel): this
  setDefaultLevel(level: LogLevel): this
  resetLevel(): this

  // Logger management
  getLogger(name: string | symbol): LoggerInstance
  getLoggers(): Record<string, LoggerInstance>

  // Console management
  use(consoleImpl: Console): void
}

License

MIT © Cyrus Venn Casada

Contributing

Contributions are welcome! Please feel free to submit issues and pull requests.