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/**--- 16 description: > 17 when comparing types S and T for a given relationship, 18 the relationship in question is assumed to be true for every directly or indirectly nested occurrence of the same S and the same T 19 module: ESNext 20 isCurrent: true 21 ---*/ 22 23 24import { Assert } from '../../../../../suite/assert.js' 25 26interface iA { 27 next: iA; 28} 29interface iB { 30 next: iC; 31} 32interface iC { 33 next: iD; 34} 35interface iD { 36 next: iB; 37} 38type IsEqual<T, U> = 39 (<T1>() => T1 extends T ? 1 : 2) extends 40 (<T2>() => T2 extends U ? 1 : 2) 41 ? true 42 : false 43var t1: IsEqual<iA, iB> = true; 44Assert.isTrue(t1);