myex-cli/src/utils/logger.js

Opinionated Express.js framework with CLI tools

import winston from 'winston';
import path from 'path';
import { fileURLToPath } from 'url';

// Get directory paths from ES modules
const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);
const logDir = path.join(__dirname, '../../logs');

// Define log levels
const levels = {
  error: 0,
  warn: 1,
  info: 2,
  http: 3,
  debug: 4,
};

// Define log level based on environment
const level = () => {
  const env = process.env.NODE_ENV || 'development';
  const isDevelopment = env === 'development';
  return isDevelopment ? 'debug' : process.env.LOG_LEVEL || 'info';
};

// Define log colors
const colors = {
  error: 'red',
  warn: 'yellow',
  info: 'green',
  http: 'magenta',
  debug: 'blue',
};

// Add colors to winston
winston.addColors(colors);

// Define Winston format
const format = winston.format.combine(
  winston.format.timestamp({ format: 'YYYY-MM-DD HH:mm:ss' }),
  winston.format.printf(
    (info) => `${info.timestamp} ${info.level}: ${info.message}`
  )
);

// Define transports
const transports = [
  // Console transport for all environments
  new winston.transports.Console({
    format: winston.format.combine(
      winston.format.colorize({ all: true }),
      winston.format.printf(
        (info) => `${info.timestamp} ${info.level}: ${info.message}`
      )
    ),
  }),
  
  // Error log file transport
  new winston.transports.File({
    filename: path.join(logDir, 'error.log'),
    level: 'error',
  }),
  
  // Combined log file transport
  new winston.transports.File({
    filename: path.join(logDir, 'combined.log'),
  }),
];

// Create the Winston logger
export const logger = winston.createLogger({
  level: level(),
  levels,
  format,
  transports,
});