1 files changed, 45 insertions, 0 deletions
diff --git a/node_modules/react-dom/lib/accumulate.js b/node_modules/react-dom/lib/accumulate.js
new file mode 100644
index 000000000..a4c763fe4
--- /dev/null
+++ b/node_modules/react-dom/lib/accumulate.js
@@ -0,0 +1,45 @@
+/**
+ * Copyright 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.
+ *
+ * 
+ */
+
+'use strict';
+
+var _prodInvariant = require('./reactProdInvariant');
+
+var invariant = require('fbjs/lib/invariant');
+
+/**
+ * Accumulates items that must not be null or undefined.
+ *
+ * This is used to conserve memory by avoiding array allocations.
+ *
+ * @return {*|array<*>} An accumulation of items.
+ */
+function accumulate(current, next) {
+  !(next != null) ? process.env.NODE_ENV !== 'production' ? invariant(false, 'accumulate(...): Accumulated items must be not be null or undefined.') : _prodInvariant('29') : void 0;
+
+  if (current == null) {
+    return next;
+  }
+
+  // Both are not empty. Warning: Never call x.concat(y) when you are not
+  // certain that x is an Array (x could be a string with concat method).
+  if (Array.isArray(current)) {
+    return current.concat(next);
+  }
+
+  if (Array.isArray(next)) {
+    return [current].concat(next);
+  }
+
+  return [current, next];
+}
+
+module.exports = accumulate;
+\ No newline at end of file