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 itf { 17 f1: ((s: string) => string) 18 f2: ((() => number) | null) 19 f3: (((() => void) | null) | String) 20 f4: (((() => boolean) | null) | String) 21} 22 23class A implements itf { 24 f1 = (s: string): string => { 25 return s 26 } 27 f2 = null 28 f3 = "f3" 29 f4 = (): boolean => { 30 return true; 31 } 32} 33 34 35function main() { 36 let a: A = new A() 37 assertEQ(a.f1("f1"), "f1") 38 assertEQ(a.f2, null) 39 assertEQ(a.f3, "f3") 40 assertEQ(a.f4(), true) 41} 42