1/*
2 * Copyright (c) 2024 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    status: string = "";
18}
19
20class B {
21    status: string = "";
22}
23
24type Union = A | B;
25
26function main() : void {
27    let fn = (value : Union) : string => {
28        return value.status;
29    };
30
31    let a : A = new A();
32    let b : B = new B();
33    a.status = "hello_a";
34    b.status = "hello_b";
35    assert fn(a) === "hello_a";
36    assert fn(b) === "hello_b";
37}
38