PgPubSub.once() method

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

Signature:

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

Parameters

Parameter	Type	Description
event	'unlisten'	`'unlisten'` — this process stopped listening one or more channels
listener	typeof unlisten	handler invoked when this process stopped listening one or more channels. Fires at most once.

Returns:

this

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