PgPubSub.once() method

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

Signature:

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

Parameters

Parameter	Type	Description
event	'message'	`'message'` — a notification arrived on any listened channel
listener	typeof message	handler invoked when a notification arrived on any listened channel. Fires at most once.

Returns:

this

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