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 16enum Empty { } 17 18class TestClass { } 19 20function main() { 21 let a: Empty | undefined = undefined; 22 let c: Empty | string | TestClass = "123" 23 foo(a); 24 foo2(c) 25} 26 27function foo(a?: Empty) { } 28 29function foo2(a?: Empty | string | TestClass) { 30 assertEQ(a, "123") 31} 32