From Joomla! Documentation
< Extension Installer | TriggersRevision as of 23:52, 24 September 2008 by Pasamio
The onAfterExtensionUninstall trigger occurs after the uninstallation of an extension. It has these parameters:
A copy of the installer instance that was used. This it to get access to any error messages that might have occured.
The extension ID of the uninstalled extension.
The result of the operation (boolean)