1/* 2 * Copyright (c) 2023 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 16import assert = require('assert'); 17 18class Control { 19 private state: any; 20} 21 22interface SelectableControl extends Control { 23 select(s: string): string; 24} 25 26class Button extends Control implements SelectableControl { 27 select(s: string): string { 28 return s; 29 } 30} 31 32let one_button = new Button(); 33assert(one_button.select('two') === 'two', 'success'); 34