| 123456789101112131415161718192021222324252627 | /*! *****************************************************************************Copyright (c) Microsoft Corporation. All rights reserved.Licensed under the Apache License, Version 2.0 (the "License"); you may not usethis file except in compliance with the License. You may obtain a copy of theLicense at http://www.apache.org/licenses/LICENSE-2.0THIS CODE IS PROVIDED ON AN *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANYKIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIEDWARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,MERCHANTABLITY OR NON-INFRINGEMENT.See the Apache Version 2.0 License for specific language governing permissionsand limitations under the License.***************************************************************************** *//// <reference no-default-lib="true"/>interface String {    /**     * Returns a new String consisting of the single UTF-16 code unit located at the specified index.     * @param index The zero-based index of the desired code unit. A negative index will count back from the last item.     */    at(index: number): string | undefined;}
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