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// Logger Utility // Provides structured logging using winston import winston from 'winston'; export type LogLevel = 'error' | 'warn' | 'info' | 'debug'; export type LogFormat = 'json' | 'simple'; /** * Safely serialize an object to avoid circular references */ function safeStringify(obj: any): string { const seen = new WeakSet(); return JSON.stringify(obj, (_key, value) => { if (typeof value === 'object' && value !== null) { if (seen.has(value)) { return '[Circular Reference]'; } seen.add(value); } if (value instanceof Error) { return { name: value.name, message: value.message, stack: value.stack }; } return value; }); } export class Logger { private winston: winston.Logger; constructor(level: LogLevel = 'info', format: LogFormat = 'json') { this.winston = winston.createLogger({ level, format: format === 'json' ? winston.format.combine( winston.format.timestamp(), winston.format.printf(({ timestamp, level, message, ...meta }) => { const logObject = { level, message, timestamp, ...meta }; return safeStringify(logObject); }) ) : winston.format.combine( winston.format.timestamp(), winston.format.printf(({ timestamp, level, message, ...meta }) => { const metaStr = Object.keys(meta).length > 0 ? ` ${safeStringify(meta)}` : ''; return `${timestamp} [${level.toUpperCase()}]: ${message}${metaStr}`; }) ), transports: [ new winston.transports.Console() ] }); } error(message: string, meta?: any): void { this.winston.error(message, meta); } warn(message: string, meta?: any): void { this.winston.warn(message, meta); } info(message: string, meta?: any): void { this.winston.info(message, meta); } debug(message: string, meta?: any): void { this.winston.debug(message, meta); } setLevel(level: LogLevel): void { this.winston.level = level; } }