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 16// Issue #22779 - smart cast in return statement 17function isEmpty(text?: string): boolean { 18 return text === undefined || text === null || text.length === 0 19} 20 21// Some other examples 22function foo(text?: string): boolean { 23 let a: boolean = (text === undefined || text === null || text.length == 0) ? true : false 24 let b: boolean = text === undefined || text === null || text.length == 0 25 let c: boolean = !(text !== undefined) || text === null || text.length == 0 26 let d: boolean = (text !== undefined && text !== null) ? text.length == 0 : true 27 let e: boolean = (text != undefined && text != null) ? text.length == 0 : true 28 return a && b && c && d && e 29} 30 31function main(): void { 32 assertEQ(isEmpty(), true) 33 assertEQ(isEmpty(""), true) 34 assertEQ(isEmpty("a"), false) 35 assertEQ(foo(), true) 36} 37