| Index: lib/subscriptionClasses.js | 
| =================================================================== | 
| --- a/lib/subscriptionClasses.js | 
| +++ b/lib/subscriptionClasses.js | 
| @@ -14,16 +14,18 @@ | 
| * You should have received a copy of the GNU General Public License | 
| * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>. | 
| */ | 
|  | 
| /** | 
| * @fileOverview Definition of Subscription class and its subclasses. | 
| */ | 
|  | 
| +"use strict"; | 
| + | 
| let {ActiveFilter, BlockingFilter, WhitelistFilter, ElemHideBase} = require("filterClasses"); | 
| let {FilterNotifier} = require("filterNotifier"); | 
|  | 
| /** | 
| * Abstract base class for filter subscriptions | 
| * | 
| * @param {String} url    download location of the subscription | 
| * @param {String} [title]  title of the filter subscription | 
|  |