Custom events

// Executes whenever a script gets loaded
registerEvent("coolcostupit.openjs.events.ScriptLoadedEvent", {
    handleEvent: function(event) {
        var scriptName = event.getScriptName();
        log.info("Script got loaded: " + scriptName);
    }
});

// Executes whenever a script gets unloaded/disabled
registerEvent("coolcostupit.openjs.events.ScriptUnloadedEvent", {
    handleEvent: function(event) {
        var scriptName = event.getScriptName();
        log.info("Script got unloaded: " + scriptName);
    }
});

This is not a complete documentation on custom events