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/**--- 16 description: > 17 TypeScript 5.0 manages to make all enums into union enums by creating a unique type for each computed member. 18 module: ES2022 19 isCurrent: true 20 ---*/ 21 22 23import { Assert } from '../../../suite/assert.js'; 24 25enum Color { 26 Red, 27 Orange, 28 Yellow, 29 Green, 30 Blue, 31 Violet 32} 33 34enum Values { 35 First = 'aaaaa', 36 Second = 'bbbbbbbbb', 37 Third = 'ccccccccc' 38} 39 40type PrimaryValues = Color.Red | Values.First; 41 42function isPrimaryValues(c: Values | Color): c is PrimaryValues { 43 return c === Color.Red || c === Values.First; 44} 45 46const firstValue = isPrimaryValues(Values.First); 47Assert.isTrue(firstValue); 48 49const secondValue = isPrimaryValues(Color.Red); 50Assert.isTrue(secondValue); 51 52const thirdValue = isPrimaryValues(Color.Yellow); 53Assert.isFalse(thirdValue);