text: export default function isPlainObject(obj) {
    if (typeOf(obj) !== 'Object') {
      return false;
    }
  
    const ctor = obj.constructor;
  
    if (typeof ctor !== 'function') {
      return false;
    }
  
    const prot = ctor.prototype;
  
    if (typeOf(prot) !== 'Object') {
      return false;
    }
  
    return prot.hasOwnProperty('isPrototypeOf');
  }