'use strict';

/**
 * @param {any} obj The object to inspect.
 * @returns {boolean} True if the argument appears to be a plain object.
 */
function isPlainObject(obj) {
  if (typeof obj !== 'object' || obj === null) return false;
  var proto = Object.getPrototypeOf(obj);
  if (proto === null) return true;
  var baseProto = proto;

  while (Object.getPrototypeOf(baseProto) !== null) {
    baseProto = Object.getPrototypeOf(baseProto);
  }

  return proto === baseProto;
}

module.exports = isPlainObject;
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