/*
 * Copyright 2020 Spotify AB
 *
 * 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.
 */

import { JsonValue, JsonObject } from '@backstage/config';

export function isObject(obj: JsonValue | undefined): obj is JsonObject {
  if (typeof obj !== 'object') {
    return false;
  } else if (Array.isArray(obj)) {
    return false;
  }
  return obj !== null;
}

// A thing to make sure we've narrowed the type down to never
export function isNever<T extends never>() {
  return void 0 as T;
}
