Noissue - Remove unused variable IO

lib/firefoxDataCleanup.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present 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";
 
 const {Filter, ActiveFilter} = require("filterClasses");
 const {FilterNotifier} = require("filterNotifier");
 const {FilterStorage} = require("filterStorage");
-const {IO} = require("io");

[Manish Jethani, 2018/03/06 09:25:51]

This variable is unused and the reason ESLint doesn't complain is that it
assumes it's a global variable to be used elsewhere. If we set ESLint's
"sourceType" to "module" we get the error. We can remove it safely because this
file is only used as a module.

 const {Prefs} = require("prefs");
 const {SpecialSubscription} = require("subscriptionClasses");
 
 Promise.all([FilterNotifier.once("load"), Prefs.untilLoaded]).then(() =>
 {
   if (Prefs.data_cleanup_done)
     return;
 
   if (FilterStorage.firstRun)
   {
@@ skipping 41 matching lines @@
 
   // Remove any existing automatic backups
   let backups = [];
   for (let i = 1; i < 100; i++)
     backups.push(`file:patterns-backup${i}.ini`);
   browser.storage.local.remove(backups, () =>
   {
     Prefs.data_cleanup_done = true;
   });
 });