Message::flash() 

\nn\t3::Message()->flash($title = '', $text = '', $type = 'OK', $queueID = NULL); 

Saves a flash message in the message queue for frontend or backend. | @return void

Source Code 

public function flash( $title = '', $text = '', $type = 'OK', $queueID = null )
{
	$message = GeneralUtility::makeInstance(FlashMessage::class,
		$text,
		$title,
		constant("TYPO3\CMS\Core\Type\ContextualFeedbackSeverity::{$type}"),
		true
	);
	$flashMessageService = GeneralUtility::makeInstance(FlashMessageService::class);
	$queueID = $queueID ?: $this->queueId ?: 'core.template.flashMessages';
	$messageQueue = $flashMessageService->getMessageQueueByIdentifier( $queueID );
	$messageQueue->addMessage($message);
}
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