Event names follow a pattern that helps determine the origination point of the Event object.
Custom Events
Custom events are events you define in your framework, like message and invite. They are simply Strings, but events may not include any special characters (except .).
$ - System Events
System events always begin with a $. For example, $.ready and $.online.join are examples of events emitted by ChatEngine. They are system events that are automatically emitted when specific events occur. System events are documented in the ChatEngine API reference.
$plugin - Plugin Events
Plugin events always begin with $pluginName. For example, $typingIndicator.startTyping indicates a plugin event Event emitted by the module:chat-engine-typing-indicator plugin. The $typingIndicator string is a plugin namespace and startTyping is the plugin Event. Namespacing plugins helps ensure that there are no collisions between plugins.
Event Children
Dots (.) in an event name indicate that the Event is a child of some parent. For example image.like indicates that a "like" Event was fired for a specific image. You could then subscribe to all image events by subscribing to the image.* Event. See Wildcards.