/**
 * @license
 * MIT License
 *
 * Copyright (c) 2021 Alexis Munsayac
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 *
 * @author Alexis Munsayac <alexis.munsayac@gmail.com>
 * @copyright Alexis Munsayac 2021
 */
export default function isPlainObject(obj: unknown): obj is Record<string | symbol, any> {
  // Basic check for Type object that's not null
  if (typeof obj === 'object' && obj !== null) {
    // If Object.getPrototypeOf supported, use it
    if (typeof Object.getPrototypeOf === 'function') {
      const proto = Object.getPrototypeOf(obj);
      return proto === Object.prototype || proto === null;
    }

    // Otherwise, use internal class
    // This should be reliable as if getPrototypeOf not supported, is pre-ES5
    return Object.prototype.toString.call(obj) === '[object Object]';
  }

  // Not an object
  return false;
}