1/*
2 * Copyright (c) 2023-2024 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 Shape {}
17class Circle extends Shape {x: number = 5}
18class Square extends Shape {y: string = "a"}
19
20function createShape(): Shape {
21    return new Circle()
22}
23
24let c1 = <Circle> createShape()
25
26let c2 = createShape() as Circle
27
28// No report is provided during compilation
29// nor during runtime if cast is wrong:
30let c3 = createShape() as Square
31console.log(c3.y) // undefined
32
33// Important corner case for casting primitives to the boxed counterparts:
34// The left operand is not properly boxed here in in runtime
35// because "as" has no runtime effect in TypeScript
36let e1 = (5.0 as Number) instanceof Number // false
37
38// Number object is created and instanceof works as expected:
39let e2 = (new Number(5.0)) instanceof Number // true