Issue 4878 - Start using ESLint for adblockpluscore

lib/elemHideEmulation.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2016 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+"use strict";
+
 /**
  * @fileOverview Element hiding emulation implementation.
  */
 
-let {ElemHide} = require("elemHide");
-let {Filter} =  require("filterClasses");
+const {ElemHide} = require("elemHide");
+const {Filter} = require("filterClasses");
 
-var filters = Object.create(null);
+let filters = Object.create(null);
 
 /**
  * Container for element hiding emulation filters
  * @class
  */
-let ElemHideEmulation = exports.ElemHideEmulation =
-{
+let ElemHideEmulation = {
   /**
    * Removes all known filters
    */
-  clear: function()
+  clear()
   {
     filters = Object.create(null);
   },
 
   /**
    * Add a new element hiding emulation filter
    * @param {ElemHideEmulationFilter} filter
    */
-  add: function(filter)
+  add(filter)
   {
     filters[filter.text] = true;
   },
 
   /**
    * Removes an element hiding emulation filter
    * @param {ElemHideEmulationFilter} filter
    */
-  remove: function(filter)
+  remove(filter)
   {
     delete filters[filter.text];
   },
 
   /**
    * Returns a list of all rules active on a particular domain
-   * @param {String} domain
+   * @param {string} domain
    * @return {ElemHideEmulationFilter[]}
    */
-  getRulesForDomain: function(domain)
+  getRulesForDomain(domain)
   {
     let result = [];
     let keys = Object.getOwnPropertyNames(filters);
     for (let key of keys)
     {
       let filter = Filter.fromText(key);
-      if (filter.isActiveOnDomain(domain) && !ElemHide.getException(filter, domain))
+      if (filter.isActiveOnDomain(domain) &&
+          !ElemHide.getException(filter, domain))
+      {
         result.push(filter);
+      }
     }
     return result;
   }
 };
+exports.ElemHideEmulation = ElemHideEmulation;