Issue 6449 - Switch to Harmony modules

lib/io.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 keyPrefix = "file:";
 
 function fileToKey(fileName)
 {
   return keyPrefix + fileName;
 }
 
 function loadFile(fileName)
 {
   return new Promise((resolve, reject) =>
@@ skipping 34 matching lines @@
     ext.storage.remove(fileToKey(fileName), () =>
     {
       if (browser.runtime.lastError)
         reject(browser.runtime.lastError.message);
       else
         resolve();
     });
   });
 }
 
-exports.IO =
-{
+export const IO = {
   /**
    * Reads text lines from a file.
    * @param {string} fileName
    *    Name of the file to be read
    * @param {TextSink} listener
    *    Function that will be called for each line in the file
    * @return {Promise}
    *    Promise to be resolved or rejected once the operation is completed
    */
   readFromFile(fileName, listener)
@@ skipping 89 matching lines @@
         lastModified: entry.lastModified
       };
     }).catch(error =>
     {
       if (error.type == "NoSuchFile")
         return {exists: false};
       throw error;
     });
   }
 };