1/* 2 * Copyright (c) 2025 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16type U = TypeA | TypeB; 17 18interface TypeA { 19 kind: 'A'; 20 a: number; 21} 22interface TypeB { 23 kind: 'B'; 24 b: string; 25} 26 27function IfWithString(val: U) { 28 return /* @@ label */val['kind'] === 'B' 29} 30 31/* @@@ label Error TypeError: Indexed access is not supported for such expression type. */ 32