M365 Copilot MCP Server

/** * Logging utility for MCP server * Logs to stderr to avoid interfering with stdio protocol */ export enum LogLevel { DEBUG = 0, INFO = 1, WARN = 2, ERROR = 3, } class Logger { private logLevel: LogLevel = LogLevel.INFO; setLogLevel(level: LogLevel): void { this.logLevel = level; } private formatMessage(level: string, message: string, context?: Record<string, unknown>): string { const timestamp = new Date().toISOString(); const contextStr = context ? ` ${JSON.stringify(context)}` : ''; return `[${timestamp}] [${level}] ${message}${contextStr}`; } private log(level: LogLevel, levelName: string, message: string, context?: Record<string, unknown>): void { if (level >= this.logLevel) { console.error(this.formatMessage(levelName, message, context)); } } debug(message: string, context?: Record<string, unknown>): void { this.log(LogLevel.DEBUG, 'DEBUG', message, context); } info(message: string, context?: Record<string, unknown>): void { this.log(LogLevel.INFO, 'INFO', message, context); } warn(message: string, context?: Record<string, unknown>): void { this.log(LogLevel.WARN, 'WARN', message, context); } error(message: string, error?: Error | unknown, context?: Record<string, unknown>): void { const errorContext = { ...context, ...(error instanceof Error ? { errorName: error.name, errorMessage: error.message, errorStack: error.stack, } : { error: String(error) }), }; this.log(LogLevel.ERROR, 'ERROR', message, errorContext); } } // Export singleton instance export const logger = new Logger(); // Export convenience methods export const debug = logger.debug.bind(logger); export const info = logger.info.bind(logger); export const warn = logger.warn.bind(logger); export const error = logger.error.bind(logger); export const setLogLevel = logger.setLogLevel.bind(logger);