--- /dev/null
+/*! *****************************************************************************
+Copyright (c) Microsoft Corporation. All rights reserved.
+Licensed under the Apache License, Version 2.0 (the "License"); you may not use
+this file except in compliance with the License. You may obtain a copy of the
+License at http://www.apache.org/licenses/LICENSE-2.0
+
+THIS CODE IS PROVIDED ON AN *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
+WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
+MERCHANTABLITY OR NON-INFRINGEMENT.
+
+See the Apache Version 2.0 License for specific language governing permissions
+and limitations under the License.
+***************************************************************************** */
+
+
+
+/// <reference no-default-lib="true"/>\r
+
+
+interface SymbolConstructor {\r
+ /**\r
+ * A reference to the prototype.\r
+ */\r
+ readonly prototype: Symbol;\r
+\r
+ /**\r
+ * Returns a new unique Symbol value.\r
+ * @param description Description of the new Symbol object.\r
+ */\r
+ (description?: string | number): symbol;\r
+\r
+ /**\r
+ * Returns a Symbol object from the global symbol registry matching the given key if found.\r
+ * Otherwise, returns a new symbol with this key.\r
+ * @param key key to search for.\r
+ */\r
+ for(key: string): symbol;\r
+\r
+ /**\r
+ * Returns a key from the global symbol registry matching the given Symbol if found.\r
+ * Otherwise, returns a undefined.\r
+ * @param sym Symbol to find the key for.\r
+ */\r
+ keyFor(sym: symbol): string | undefined;\r
+}\r
+\r
+declare var Symbol: SymbolConstructor;
\ No newline at end of file