Add a2a-server package to gemini-cli (#6597)

packages/a2a-server/src/logger.ts

@@ -0,0 +1,28 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import winston from 'winston';
+
+const logger = winston.createLogger({
+  level: 'info',
+  format: winston.format.combine(
+    // First, add a timestamp to the log info object
+    winston.format.timestamp({
+      format: 'YYYY-MM-DD HH:mm:ss.SSS A', // Custom timestamp format
+    }),
+    // Here we define the custom output format
+    winston.format.printf((info) => {
+      const { level, timestamp, message, ...rest } = info;
+      return (
+        `[${level.toUpperCase()}] ${timestamp} -- ${message}` +
+        `${Object.keys(rest).length > 0 ? `\n${JSON.stringify(rest, null, 2)}` : ''}`
+      ); // Only print ...rest if present
+    }),
+  ),
+  transports: [new winston.transports.Console()],
+});
+
+export { logger };