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 16class Foo { 17 static s_instance: Foo | undefined; 18 value: boolean = false; 19 20 static foo<T extends Foo>(): void { 21 const instance = Foo.s_instance as T; 22 if (instance != undefined) { 23 instance.value = true; 24 } 25 } 26} 27 28class Bar extends Foo { } 29Foo.s_instance = new Bar(); 30Foo.foo<Bar>(); 31assertTrue(Foo.s_instance?.value == true); 32assertTrue((Foo.s_instance as Bar).value); 33