// Copyright 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

/**
 * This is useful to keep TypeScript happy in a test - if you have a value
 * that's potentially `null` you can use this function to assert that it isn't,
 * and satisfy TypeScript that the value is present.
 */
export function assertNotNull<T>(val: T): asserts val is NonNullable<T> {
  if (val === null) {
    throw new Error(`Expected given value to not be null but it was: ${val}`);
  }
}