localstorage-schema-update.js

/**
 * Data transforms due to version updates.
 */
function schema() {
  // Update keys.
  var keys = {
        'MY-NEW-KEY': {'oldKey': 'MY-OLD-KEY', 'version': '0.2.0'}
      };

  for (var newKey in keys) {
    if (!$.jStorage.get(newKey) && ($.jStorage.get(keys[newKey].oldKey !== null))) {
      $.jStorage.set(newKey, $.jStorage.set(keys[newKey].oldKey));
      $.jStorage.deleteKey(keys[newKey].oldKey);
      if (typeof console != "undefined") console.log('Updated storage key: ' + newKey);
    }
  }
}