Cleanup from last review (#5302)

* Cleanup from last review

* Can't use object spread

Author: rickhanlonii

packages/jest-util/src/__tests__/deep_cyclic_copy.test.js

@@ -65,14 +65,19 @@ it('handles cyclic dependencies', () => {
 it('uses the blacklist to avoid copying properties on the first level', () => {
   const obj = {
     blacklisted: 41,
+    blacklisted2: 42,
     subObj: {
-      blacklisted: 42,
+      blacklisted: 43,
     },
   };
 
-  expect(deepCyclicCopy(obj, {blacklist: new Set(['blacklisted'])})).toEqual({
+  expect(
+    deepCyclicCopy(obj, {
+      blacklist: new Set(['blacklisted', 'blacklisted2']),
+    }),
+  ).toEqual({
     subObj: {
-      blacklisted: 42,
+      blacklisted: 43,
     },
   });
 });
@@ -134,7 +139,7 @@ it('does not keep the prototype of arrays when keepPrototype = false', () => {
     this.length = 0;
   }();
 
-  const copy = deepCyclicCopy(sourceArray);
+  const copy = deepCyclicCopy(sourceArray, {keepPrototype: false});
   expect(Object.getPrototypeOf(copy)).not.toBe(
     Object.getPrototypeOf(sourceArray),
   );

packages/jest-util/src/deep_cyclic_copy.js

@@ -66,10 +66,12 @@ function deepCyclicCopyObject(
     }
 
     const descriptor = descriptors[key];
-
     if (typeof descriptor.value !== 'undefined') {
-      delete options.blacklist;
-      descriptor.value = deepCyclicCopy(descriptor.value, options, cycles);
+      descriptor.value = deepCyclicCopy(
+        descriptor.value,
+        {blacklist: EMPTY, keepPrototype: options.keepPrototype},
+        cycles,
+      );
     }
 
     descriptor.configurable = true;
@@ -92,8 +94,11 @@ function deepCyclicCopyArray(
   cycles.set(array, newArray);
 
   for (let i = 0; i < length; i++) {
-    delete options.blacklist;
-    newArray[i] = deepCyclicCopy(array[i], options, cycles);
+    newArray[i] = deepCyclicCopy(
+      array[i],
+      {blacklist: EMPTY, keepPrototype: options.keepPrototype},
+      cycles,
+    );
   }
 
   return newArray;