From 05726934706edaff19c01e0983f802ddb8ffe6e4 Mon Sep 17 00:00:00 2001
From: Ben Newman <ben@apollographql.com>
Date: Mon, 19 Apr 2021 11:45:17 -0400
Subject: [PATCH] Use deep equality check before calling watch.callback.

Similar to #7997, but further upstream.
---
 src/cache/inmemory/inMemoryCache.ts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/cache/inmemory/inMemoryCache.ts b/src/cache/inmemory/inMemoryCache.ts
index 73770eb4e3b..b5fee375c4b 100644
--- a/src/cache/inmemory/inMemoryCache.ts
+++ b/src/cache/inmemory/inMemoryCache.ts
@@ -3,6 +3,7 @@ import './fixPolyfills';
 
 import { DocumentNode } from 'graphql';
 import { wrap } from 'optimism';
+import { equal } from '@wry/equality';
 
 import { ApolloCache, BatchOptions } from '../core/cache';
 import { Cache } from '../core/types/Cache';
@@ -488,7 +489,7 @@ export class InMemoryCache extends ApolloCache<NormalizedCacheObject> {
       }
     }
 
-    if (!lastDiff || lastDiff.result !== diff.result) {
+    if (!lastDiff || !equal(lastDiff.result, diff.result)) {
       c.callback(c.lastDiff = diff, lastDiff);
     }
   }