Javascript overriding LocalStorage and SessionStorage for hiding data

.js

//For React, just put this into anyway inside the react project
const _setItem = Storage.prototype.setItem;

const _getItem = Storage.prototype.getItem;

Storage.prototype.setItem = function(key, value) {
  if (this === sessionStorage) { //example of specific Storage type
    _setItem.call(this, key, btoa(encodeURIComponent(value)));//encodingURI is for language other than Latin
  } else {
    _setItem.call(this, arguments[0], arguments[1]);
  }
};

Storage.prototype.getItem = function(key) {
  if (this === sessionStorage) {
    //preventing error if xxxStorage.getItem == null. because atob(null) will return error
    return _getItem.call(this, key) ? decodeURIComponent(atob(_getItem.call(this, key))) : _getItem.call(this, key);
  }
  return _getItem.call(this, key);
};