Initial

src/utils/logger.ts

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+import winston from 'winston';
+
+export type Logger = winston.Logger;
+
+export function createLogger(): Logger {
+  return winston.createLogger({
+    level: process.env.LOG_LEVEL || 'info',
+    format: winston.format.combine(
+      winston.format.timestamp(),
+      winston.format.errors({ stack: true }),
+      winston.format.json()
+    ),
+    transports: [
+      new winston.transports.Console({
+        format: winston.format.combine(
+          winston.format.colorize(),
+          winston.format.printf(({ level, message, timestamp, ...meta }) => {
+            const metaStr = Object.keys(meta).length ? ` ${JSON.stringify(meta)}` : '';
+            return `${timestamp} [${level}]: ${message}${metaStr}`;
+          })
+        ),
+      }),
+      new winston.transports.File({
+        filename: 'logs/error.log',
+        level: 'error',
+      }),
+      new winston.transports.File({
+        filename: 'logs/combined.log',
+      }),
+    ],
+  });
+}