From f668e8e4880256223c41c2c3183434e81c7f7945 Mon Sep 17 00:00:00 2001
From: Sebastian Schmidt <mrschmidt@google.com>
Date: Wed, 22 Jan 2020 10:06:12 -0800
Subject: [PATCH] fix: do not assume all custom objects have constructors
 (#893)

fixes https://github.com/googleapis/nodejs-firestore/issues/892
---
 dev/src/serializer.ts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/dev/src/serializer.ts b/dev/src/serializer.ts
index db6b3de30..3dc61b970 100644
--- a/dev/src/serializer.ts
+++ b/dev/src/serializer.ts
@@ -400,6 +400,7 @@ function isMomentJsType(value: unknown): value is Moment {
   return (
     typeof value === 'object' &&
     value !== null &&
+    value.constructor &&
     value.constructor.name === 'Moment' &&
     typeof (value as Moment).toDate === 'function'
   );