code: function _buildKey(context, key) {
    let appConfig = getOwner(context).resolveRegistration('config:environment');
    let addonConfig = appConfig && appConfig['ember-local-storage'] || {};
    let namespace = _getNamespace(appConfig, addonConfig);
    let delimiter = addonConfig.keyDelimiter || ':';
  
    return namespace ? `${namespace}${delimiter}${key}` : key;
  }
docs: TODO: Add migration helper