| // Copyright (C) 2018 The Android Open Source Project |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| export function assertExists<A>(value: A | null | undefined): A { |
| if (value === null || value === undefined) { |
| throw new Error('Value doesn\'t exist'); |
| } |
| return value; |
| } |
| |
| export function assertTrue(value: boolean, optMsg?: string) { |
| if (value !== true) { |
| throw new Error(optMsg ? optMsg : 'Failed assertion'); |
| } |
| } |
| |
| export function assertFalse(value: boolean, optMsg?: string) { |
| assertTrue(!value, optMsg); |
| } |