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 16class A{ 17 field1:number = 10; 18 foo(){} 19} 20 21class B extends A{ 22 bfield1:number = 10; 23 bfoo(){} 24} 25 26function main() : void { 27 let c1:keyof B = "field1" 28 let c2:keyof B = "foo" 29 let c3:keyof B = "bfield1" 30 let c4:keyof B = "bfoo" 31 32 type keyofB = keyof B; 33 let c5:keyofB = "field1" 34 let c6:keyofB = "foo" 35 let c7:keyofB = "bfield1" 36 let c8:keyofB = "bfoo" 37} 38