Issue 4878 - Start using ESLint for adblockpluscore

test/stub-modules/prefs.js

+"use strict";
+
 let listeners = [];
 
 let Prefs = exports.Prefs = {
   enabled: true,
   savestats: true,
   subscriptions_autoupdate: true,
   subscriptions_fallbackerrors: 5,
   subscriptions_fallbackurl: "",
   notificationurl: "http://example.com/notification.json",
   notificationdata: {},
   notifications_ignoredcategories: []
 };
 
 for (let key of Object.keys(Prefs))
 {
   let value = Prefs[key];
   Object.defineProperty(Prefs, key, {
-    get: () => value,
-    set: newValue =>
+    get()
+    {
+      return value;
+    },
+    set(newValue)
     {
       if (newValue == value)
         return;
 
       value = newValue;
       for (let listener of listeners)
         listener(key);
     }
   });
 }
 
 Prefs.addListener = function(listener)
 {
   if (listeners.indexOf(listener) < 0)
     listeners.push(listener);
 };
 
 Prefs.removeListener = function(listener)
 {
   let index = listeners.indexOf(listener);
   if (index >= 0)
     listeners.splice(index, 1);
 };