Update lib/logger.js

Co-authored-by: Chemi Atlow <[email protected]>

Author: mertcanaltin

lib/logger.js

@@ -119,7 +119,7 @@ class JSONConsumer extends LogConsumer {
     super(options);
     const {
       stream,
-      fields = {},
+      fields = kEmptyObject,
     } = options;
 
     validateObject(fields, 'options.fields');