[fix] add support for es6 Symbol type.

- resolves winstonjs#805
tjwebb · Feb 13, 2016 · eb90196 · eb90196
1 parent 953e1d2
commit eb90196
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/lib/winston/common.js b/lib/winston/common.js
@@ -311,6 +311,14 @@ exports.timestamp = function () {
 // logging to non-JSON inputs.
 //
 exports.serialize = function (obj, key) {
+  // symbols cannot be directly casted to strings
+  if (typeof key === 'symbol') {
+    key = key.toString()
+  }
+  if (typeof obj === 'symbol') {
+    obj = obj.toString()
+  }
+
   if (obj === null) {
     obj = 'null';
   }