Do not add global variables.

/* Left Message Tray Move the message tray to the left side Copyright (C) 2012 Robytrevi <robytrevi@hotmail.com> This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */ function LeftMessageTray() { const St = imports.gi.St; const Main = imports.ui.main; const MessageTray = imports.ui.messageTray; this.enable = function(){ // Align summary items to the left Main.messageTray._summaryBin.x_align = St.Align.START } this.disable = function(){ // Align summary items to the right Main.messageTray._summaryBin.x_align = St.Align.END } } function init() { leftMessageTray = new LeftMessageTray() } function enable() { leftMessageTray.enable() } function disable() { leftMessageTray.disable() }

Now why did you do that... I was complaining about the implicit assignment to "leftMessageTray", if you were wondering. I'd just get rid of the LeftMessageTray class and just stick the bodies in the enable/disable functions.

/* Left Message Tray Move the message tray to the left side Copyright (C) 2012 Robytrevi <robytrevi@hotmail.com> This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */ const St = imports.gi.St; const Main = imports.ui.main; const MessageTray = imports.ui.messageTray; function LeftMessageTray() { } function init() { } function enable() { Main.messageTray._summaryBin.x_align = St.Align.START } function disable() { Main.messageTray._summaryBin.x_align = St.Align.END }