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 
16interface Observable {} 
17
18class StateImpl<Value> implements Observable {
19
20}
21
22function statesNamed(): Observable | undefined {
23    return undefined 
24}
25
26function getNamedState<T>(): StateImpl<T> | undefined {
27    const state = statesNamed()
28    return state instanceof StateImpl ? state as StateImpl<T>: undefined
29}
30
31function main () {
32    getNamedState<Number>()
33}