1 files changed, 107 insertions, 0 deletions
diff --git a/node_modules/fbjs/lib/areEqual.js.flow b/node_modules/fbjs/lib/areEqual.js.flow
new file mode 100644
index 000000000..67294f212
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+++ b/node_modules/fbjs/lib/areEqual.js.flow
@@ -0,0 +1,107 @@
+/**
+ * Copyright (c) 2013-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @providesModule areEqual
+ * @flow
+ */
+
+const aStackPool = [];
+const bStackPool = [];
+
+/**
+ * Checks if two values are equal. Values may be primitives, arrays, or objects.
+ * Returns true if both arguments have the same keys and values.
+ *
+ * @see http://underscorejs.org
+ * @copyright 2009-2013 Jeremy Ashkenas, DocumentCloud Inc.
+ * @license MIT
+ */
+function areEqual(a: any, b: any): boolean {
+  const aStack = aStackPool.length ? aStackPool.pop() : [];
+  const bStack = bStackPool.length ? bStackPool.pop() : [];
+  const result = eq(a, b, aStack, bStack);
+  aStack.length = 0;
+  bStack.length = 0;
+  aStackPool.push(aStack);
+  bStackPool.push(bStack);
+  return result;
+}
+
+function eq(a: any, b: any, aStack: Array<any>, bStack: Array<any>): boolean {
+  if (a === b) {
+    // Identical objects are equal. `0 === -0`, but they aren't identical.
+    return a !== 0 || 1 / a == 1 / b;
+  }
+  if (a == null || b == null) {
+    // a or b can be `null` or `undefined`
+    return false;
+  }
+  if (typeof a != 'object' || typeof b != 'object') {
+    return false;
+  }
+  const objToStr = Object.prototype.toString;
+  const className = objToStr.call(a);
+  if (className != objToStr.call(b)) {
+    return false;
+  }
+  switch (className) {
+    case '[object String]':
+      return a == String(b);
+    case '[object Number]':
+      return isNaN(a) || isNaN(b) ? false : a == Number(b);
+    case '[object Date]':
+    case '[object Boolean]':
+      return +a == +b;
+    case '[object RegExp]':
+      return a.source == b.source && a.global == b.global && a.multiline == b.multiline && a.ignoreCase == b.ignoreCase;
+  }
+  // Assume equality for cyclic structures.
+  let length = aStack.length;
+  while (length--) {
+    if (aStack[length] == a) {
+      return bStack[length] == b;
+    }
+  }
+  aStack.push(a);
+  bStack.push(b);
+  let size = 0;
+  // Recursively compare objects and arrays.
+  if (className === '[object Array]') {
+    size = a.length;
+    if (size !== b.length) {
+      return false;
+    }
+    // Deep compare the contents, ignoring non-numeric properties.
+    while (size--) {
+      if (!eq(a[size], b[size], aStack, bStack)) {
+        return false;
+      }
+    }
+  } else {
+    if (a.constructor !== b.constructor) {
+      return false;
+    }
+    if (a.hasOwnProperty('valueOf') && b.hasOwnProperty('valueOf')) {
+      return a.valueOf() == b.valueOf();
+    }
+    const keys = Object.keys(a);
+    if (keys.length != Object.keys(b).length) {
+      return false;
+    }
+    for (let i = 0; i < keys.length; i++) {
+      if (!eq(a[keys[i]], b[keys[i]], aStack, bStack)) {
+        return false;
+      }
+    }
+  }
+  aStack.pop();
+  bStack.pop();
+  return true;
+}
+
+module.exports = areEqual;
+\ No newline at end of file