PgPubSub.once() method

Sets 'notify' event handler, which fired only one single time

Signature:

once(event: 'notify', listener: typeof notify): this;

Parameters

Parameter	Type	Description
event	'notify'	`'notify'` — this instance published a notification
listener	typeof notify	handler invoked when this instance published a notification. Fires at most once.

Returns:

this

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