From 13fce451d8c24365d5b62c52178ceb96c70e7535 Mon Sep 17 00:00:00 2001
From: Charles Lyding <19598772+clydin@users.noreply.github.com>
Date: Wed, 4 May 2022 11:48:11 -0400
Subject: [PATCH] refactor(@angular-devkit/core): delete `deepCopy` temporary
 symbol property after use

The `deepCopy` utility function previously set its internal tracking symbol property to `undefined` after completion.
However, this still caused the property to exist with a value of `undefined`. Jasmine 4.1 now checks for symbols with
its `toEqual` expectation which resulted in failing tests. The internal tracking symbol property is now removed instead
via `delete`.
---
 packages/angular_devkit/core/src/utils/object.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/angular_devkit/core/src/utils/object.ts b/packages/angular_devkit/core/src/utils/object.ts
index 0895ac4130..5ad7de7dbd 100644
--- a/packages/angular_devkit/core/src/utils/object.ts
+++ b/packages/angular_devkit/core/src/utils/object.ts
@@ -33,7 +33,7 @@ export function deepCopy<T>(value: T): T {
     for (const key of Object.getOwnPropertyNames(valueCasted)) {
       copy[key] = deepCopy(valueCasted[key]);
     }
-    valueCasted[copySymbol] = undefined;
+    delete valueCasted[copySymbol];
 
     return copy;
   } else {