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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
16class A<T> {
17    A(a?: T | number[]) {
18        if (a instanceof Error) {
19            return this.D(a);
20        } else if (a instanceof undefined) {
21            return this.B(a);
22        } else if (a instanceof number[]) {
23            return this.E(a);
24        } else {
25            return this.C(a);
26        }
27    }
28
29    B(b: undefined) {
30        return "undefined";
31    }
32
33    C(c: T) {
34        return "Generic";
35    }
36
37    D(d: Error) {
38        return "Error";
39    }
40
41    E(e: number[]) {
42        return "number[]"
43    }
44}
45
46let a = new A<Error | number>();
47assertEQ(a.A(Error()), "Error");
48assertEQ(a.A(undefined), "undefined");
49assertEQ(a.A(1), "Generic");
50assertEQ(a.A([1, 2, 3]), "number[]")
51