An event emitter can be used to create and manage an Event for others
to subscribe to. One emitter always owns one event.
Use this class if you want to provide event from within your extension, for instance
inside a TextDocumentContentProvider or when providing
API to other extensions.
The event listeners can subscribe to.
Notify all subscribers of the event. Failure
of one or more listener will not fail this function call.
The event object.
Dispose this object and free resources.
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