fix: add notification object serialization

phpstan.neon

@@ -25,6 +25,17 @@ parameters:
 				version?: int,
 			}
 		'''
+		NotificationAsArray: '''
+			array{
+				hash: string,
+				title: string,
+				trigger: string,
+				carriers: array<string,array<string,mixed>>,
+				enabled: bool,
+				extras: array<string, array<mixed>|bool|float|int|string>,
+				version: int,
+			}
+		'''
 		NotificationUnconvertedData: '''
 			array{
 				hash?: string,

readme.txt

@@ -381,6 +381,7 @@ Removed deprecated hooks:
 * [Fixed] Stripping shortcodes in carrier fields.
 * [Fixed] Email carrier header "From" prioritized over header in settings.
 * [Fixed] User password reset link requires encoded username.
+* [Fixed] Notification class serialization.
 * [Removed] DOING_NOTIFICATION_SAVE constant.
 * [Removed] NotificationQueries class in favor of NotificationDatabaseService.
 * [Removed] Webook and Webhook JSON Carriers.

src/Core/Notification.php

@@ -36,7 +36,7 @@ class Notification
 	 *
 	 * @var Interfaces\Triggerable|null
 	 */
-	private $trigger;
+	private $trigger = null;
 
 	/**
 	 * Carriers
@@ -639,4 +639,48 @@ public function to(string $type, array $config = [])
 	{
 		return apply_filters(sprintf('notification/to/%s', $type), $this, $config);
 	}
+
+	/**
+	 * Serialized Notification instance.
+	 *
+	 * @return NotificationAsArray
+	 */
+	public function __serialize(): array
+	{
+		/** @var NotificationAsArray */
+		return $this->to('array');
+	}
+
+	/**
+	 * Unserializes Notification instance.
+	 *
+	 * @param NotificationAsArray $data Notification data as array.
+	 * @return void
+	 */
+	public function __unserialize(array $data): void
+	{
+		$this->hash = $data['hash'];
+		$this->title = $data['title'];
+		$this->enabled = $data['enabled'];
+		$this->extras = $data['extras'];
+		$this->version = $data['version'];
+		$this->trigger = is_string($data['trigger']) ? Store\Trigger::get($data['trigger']) : null;
+		$this->carriers = array_filter(
+			array_map(
+				function($carrierSlug, $carrierData) {
+					$carrier = Store\Carrier::get($carrierSlug);
+
+					if (!$carrier instanceof Interfaces\Sendable) {
+						return null;
+					}
+
+					$carrier->setData($carrierData);
+
+					return $carrier;
+				},
+				array_keys($data['carriers']),
+				array_values($data['carriers'])
+			)
+		);
+	}
 }

src/Repository/Converter/ArrayConverter.php

@@ -71,7 +71,7 @@ public function from($data): Notification
 	 * @since [Next]
 	 * @param Notification $notification Notification instance
 	 * @param array<string|int,mixed> $config The additional configuration of the converter
-	 * @return mixed
+	 * @return NotificationAsArray
 	 */
 	public function to(Notification $notification, array $config = [])
 	{