Issue 6449 - Switch to Harmony modules

lib/io.js

Index: lib/io.js
===================================================================
--- a/lib/io.js
+++ b/lib/io.js
@@ -10,18 +10,16 @@
  * 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)
@@ -66,18 +64,17 @@
       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