Atomically dequeues an event from the queue, and emits it on the event stream.
the number of elements at the point when the event was dequeued
Atomically enqueues the event
x on the event queue.
the event to enqueue
the number of enqueued events when the event was enqueued
Event stream on which this event queue releases events.
Size of the event queue.
Unreact the event stream associated with this queue.