1/* 2 * Copyright (c) 2024-2025 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 16interface A{ 17 a?:string; 18 _a?:string; 19} 20 21function main(){ 22 let o:A = { 23 _a:"aaaaaa" 24 } 25 assertEQ(o._a, "aaaaaa") 26 assertEQ(o.a, undefined) 27 28 o.a = "bbbbb" 29 assertEQ(o.a, "bbbbb") 30} 31