mcpGraph

/** * Logger utility for mcpGraph * * All logging goes to stderr to avoid interfering with MCP server * communication which uses stdout. */ type LogLevel = 'debug' | 'info' | 'warn' | 'error'; interface Logger { debug(message: string, ...args: unknown[]): void; info(message: string, ...args: unknown[]): void; warn(message: string, ...args: unknown[]): void; error(message: string, ...args: unknown[]): void; } class ConsoleLogger implements Logger { private formatMessage(level: LogLevel, message: string): string { const timestamp = new Date().toISOString(); return `[${timestamp}] [${level.toUpperCase()}] ${message}`; } private log(level: LogLevel, message: string, ...args: unknown[]): void { const formattedMessage = this.formatMessage(level, message); const logFn = level === 'error' ? console.error : console.warn; if (args.length > 0) { logFn(formattedMessage, ...args); } else { logFn(formattedMessage); } } debug(message: string, ...args: unknown[]): void { this.log('debug', message, ...args); } info(message: string, ...args: unknown[]): void { this.log('info', message, ...args); } warn(message: string, ...args: unknown[]): void { this.log('warn', message, ...args); } error(message: string, ...args: unknown[]): void { this.log('error', message, ...args); } } // Export a singleton logger instance export const logger = new ConsoleLogger();