1 // Copyright (C) 2018 The Android Open Source Project 2 // 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 export function assertExists<A>(value: A | null | undefined): A { 16 if (value === null || value === undefined) { 17 throw new Error('Value doesn\'t exist'); 18 } 19 return value; 20 } 21 22 export function assertTrue(value: boolean, optMsg?: string) { 23 if (value !== true) { 24 throw new Error(optMsg ? optMsg : 'Failed assertion'); 25 } 26 } 27 28 export function assertFalse(value: boolean, optMsg?: string) { 29 assertTrue(!value, optMsg); 30 } 31
