View file Upload/src/addons/Brivium/CustomNodeIcon/_data/code_event_listeners.xml

<?xml version="1.0" encoding="utf-8"?>
<code_event_listeners>
  <listener event_id="templater_setup" execute_order="10" callback_class="Brivium\CustomNodeIcon\Listener" callback_method="templaterSetup" active="1"/>
</code_event_listeners>