1 files changed, 84 insertions, 0 deletions
diff --git a/node_modules/jest-util/build/deepCyclicCopy.js b/node_modules/jest-util/build/deepCyclicCopy.js
new file mode 100644
index 0000000..e76e34b
--- /dev/null
+++ b/node_modules/jest-util/build/deepCyclicCopy.js
@@ -0,0 +1,84 @@
+'use strict';
+
+Object.defineProperty(exports, '__esModule', {
+  value: true
+});
+exports.default = deepCyclicCopy;
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+const EMPTY = new Set();
+
+function deepCyclicCopy(
+  value,
+  options = {
+    blacklist: EMPTY,
+    keepPrototype: false
+  },
+  cycles = new WeakMap()
+) {
+  if (typeof value !== 'object' || value === null) {
+    return value;
+  } else if (cycles.has(value)) {
+    return cycles.get(value);
+  } else if (Array.isArray(value)) {
+    return deepCyclicCopyArray(value, options, cycles);
+  } else {
+    return deepCyclicCopyObject(value, options, cycles);
+  }
+}
+
+function deepCyclicCopyObject(object, options, cycles) {
+  const newObject = options.keepPrototype
+    ? Object.create(Object.getPrototypeOf(object))
+    : {};
+  const descriptors = Object.getOwnPropertyDescriptors(object);
+  cycles.set(object, newObject);
+  Object.keys(descriptors).forEach(key => {
+    if (options.blacklist && options.blacklist.has(key)) {
+      delete descriptors[key];
+      return;
+    }
+
+    const descriptor = descriptors[key];
+
+    if (typeof descriptor.value !== 'undefined') {
+      descriptor.value = deepCyclicCopy(
+        descriptor.value,
+        {
+          blacklist: EMPTY,
+          keepPrototype: options.keepPrototype
+        },
+        cycles
+      );
+    }
+
+    descriptor.configurable = true;
+  });
+  return Object.defineProperties(newObject, descriptors);
+}
+
+function deepCyclicCopyArray(array, options, cycles) {
+  const newArray = options.keepPrototype
+    ? new (Object.getPrototypeOf(array).constructor)(array.length)
+    : [];
+  const length = array.length;
+  cycles.set(array, newArray);
+
+  for (let i = 0; i < length; i++) {
+    newArray[i] = deepCyclicCopy(
+      array[i],
+      {
+        blacklist: EMPTY,
+        keepPrototype: options.keepPrototype
+      },
+      cycles
+    );
+  }
+
+  return newArray;
+}