code: function closeAll() {
          DeprecationWarning.deprecationWarning("Use CommandManager.execute(Commands.FILE_CLOSE_ALL,{PaneId: MainViewManager.ALL_PANES}) instead of DocumentManager.closeAll()", true);
          CommandManager.execute(Commands.FILE_CLOSE_ALL, {PaneId: MainViewManager.ALL_PANES});
      }
docs: closes all open files
  @deprecated CommandManager.execute(Commands.FILE_CLOSE_ALL) instead