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
16function main() {
17  let resolve: ((value: string) => void) | null = null;
18
19  let p = new Promise<string>((_resolve: (value: string)=> void): void => {
20    resolve = _resolve;
21  });
22
23  resolve!("abc");                         // no smart cast!
24
25  let x: Number|String|undefined = "test1";
26  let y: Number|String|undefined = "test2"
27  let z: Number|String|undefined = 7
28
29  let lam: () => void = () => {
30     let y: Number|String|undefined = 2;   // hides outer declaration!
31     x = z; 
32     let tmp: number = y;                  // smart cast is used
33     assert(tmp == 2);
34  };
35
36  if (x instanceof string) {
37    let tmp: string = x as string;         // no smart cast!
38    assert(tmp == "test1");
39  }	
40
41  lam();
42
43  assert(x == 7);
44
45  if (y instanceof string) {
46    let tmp: string = y;                   // smart cast is used
47    assert(tmp == "test2");
48  }     
49
50  let w: number = z;                       // smart cast is used
51  assert(w == 7)
52}
53