Helios-9 MCP Server

import winston from 'winston' // Create logger configuration const logLevel = process.env.LOG_LEVEL || 'info' const logFormat = winston.format.combine( winston.format.timestamp(), winston.format.errors({ stack: true }), winston.format.json() ) // Console format for development const consoleFormat = winston.format.combine( winston.format.colorize(), winston.format.timestamp({ format: 'HH:mm:ss' }), winston.format.printf(({ timestamp, level, message, ...meta }) => { let log = `${timestamp} [${level}] ${message}` // Add metadata if present const metaStr = Object.keys(meta).length > 0 ? ` ${JSON.stringify(meta)}` : '' return log + metaStr }) ) // Create logger instance export const logger = winston.createLogger({ level: logLevel, format: logFormat, defaultMeta: { service: 'helios9-mcp-server' }, transports: [ // Console transport - MUST use stderr for MCP compatibility new winston.transports.Console({ format: process.env.NODE_ENV === 'production' ? logFormat : consoleFormat, stderrLevels: ['error', 'warn', 'info', 'http', 'verbose', 'debug', 'silly'] }) ] }) // Add file transport in production if (process.env.NODE_ENV === 'production') { logger.add(new winston.transports.File({ filename: 'logs/error.log', level: 'error', format: logFormat })) logger.add(new winston.transports.File({ filename: 'logs/combined.log', format: logFormat })) } // Log unhandled exceptions and rejections (to stderr) logger.exceptions.handle( new winston.transports.Console({ format: consoleFormat, stderrLevels: ['error', 'warn', 'info', 'http', 'verbose', 'debug', 'silly'] }) ) process.on('unhandledRejection', (reason, promise) => { logger.error('Unhandled Rejection at:', promise, 'reason:', reason) }) export default logger