1/* 2 * Copyright (c) 2021-2022 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 16function isPromiseLike(obj) { 17 return !!obj && isFunction_(obj.then); 18} 19 20function isFunction_(value) { 21 return isA_('Function', value); 22} 23 24function isA_(typeName, value) { 25 return getType_(value) === '[object ' + typeName + ']'; 26} 27 28function getType_(value) { 29 return Object.prototype.toString.apply(value); 30} 31 32export default isPromiseLike; 33