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 16type U1 = number[][] | string[] 17type U2 = (readonly number[][]) | (readonly string[]) 18 19function main() { 20 let v: U1 | U2 = [[1.0,2.0]] 21 v[0] = [1.0,3.0] // CTE, readonly array 22} 23 24/* @@? 21:5 Error TypeError: Cannot modify an array or tuple content that has the readonly parameter */ 25 26