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
15export 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
22export function assertTrue(value: boolean, optMsg?: string) {
23  if (value !== true) {
24    throw new Error(optMsg ? optMsg : 'Failed assertion');
25  }
26}
27
28export function assertFalse(value: boolean, optMsg?: string) {
29  assertTrue(!value, optMsg);
30}
31