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
16type TNumberStringPair = [number, string];
17type TTupleUnion = TNumberStringPair|undefined;
18
19function main(): void {
20   let x: TNumberStringPair = [12.0, "Hello World"];
21   let y: TTupleUnion = undefined;
22
23   assert x[0] == 12.0;
24}
25