1/* 2 * Copyright (c) 2024-2025 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 16type asyncLambda = () => Promise<void> 17 18async function asyncFunc(): Promise<boolean> { 19 return true; 20} 21 22function callAsyncLambda(): void { 23 let is_call_async_lambda: boolean = false; 24 25 let async_lambda: asyncLambda = async ): Promise<void> => { 26 await asyncFunc(); 27 is_call_async_lambda = true; 28 } 29 30 assertEQ(is_call_async_lambda, false); 31 await async_lambda(); 32 assertEQ(is_call_async_lambda, true); 33} 34 35function main(): void { 36 callAsyncLambda(); 37} 38 39/* @@? 25:43 Error SyntaxError: Unexpected token, expected '('. */ 40/* @@? 25:43 Error TypeError: Type '(_: Promise<void>) => Promise<void>' cannot be assigned to type '() => Promise<void>' */ 41/* @@? 25:44 Error SyntaxError: Unexpected token, expected an identifier. */ 42/* @@? 25:60 Error SyntaxError: Unexpected token, expected ',' or ')'. */ 43/* @@? 31:11 Error TypeError: Expected 1 arguments, got 0. */ 44/* @@? 31:11 Error TypeError: No matching call signature */ 45/* @@? 31:11 Error TypeError: 'await' expressions require Promise object as argument. */ 46