chore(psalm): Add type hints to make psalm happy

Signed-off-by: Julius Härtl <jus@bitgrid.net>

lib/Activity/Filter.php

@@ -42,7 +42,7 @@ class Filter implements \OCP\Activity\IFilter {
 	 * @return string Lowercase a-z and underscore only identifier
 	 * @since 11.0.0
 	 */
-	public function getIdentifier() {
+	public function getIdentifier(): string {
 		return 'deck';
 	}
 
@@ -50,7 +50,7 @@ class Filter implements \OCP\Activity\IFilter {
 	 * @return string A translated string
 	 * @since 11.0.0
 	 */
-	public function getName() {
+	public function getName(): string {
 		return $this->l10n->t('Deck');
 	}
 
@@ -60,7 +60,7 @@ class Filter implements \OCP\Activity\IFilter {
 	 * priority values. It is required to return a value between 0 and 100.
 	 * @since 11.0.0
 	 */
-	public function getPriority() {
+	public function getPriority(): int {
 		return 90;
 	}
 
@@ -68,7 +68,7 @@ class Filter implements \OCP\Activity\IFilter {
 	 * @return string Full URL to an icon, empty string when none is given
 	 * @since 11.0.0
 	 */
-	public function getIcon() {
+	public function getIcon(): string {
 		return $this->urlGenerator->imagePath('deck', 'deck-dark.svg');
 	}
 
@@ -77,7 +77,7 @@ class Filter implements \OCP\Activity\IFilter {
 	 * @return string[] An array of allowed apps from which activities should be displayed
 	 * @since 11.0.0
 	 */
-	public function filterTypes(array $types) {
+	public function filterTypes(array $types): array {
 		return array_merge($types, ['deck_comment']);
 	}
 
@@ -85,7 +85,7 @@ class Filter implements \OCP\Activity\IFilter {
 	 * @return string[] An array of allowed apps from which activities should be displayed
 	 * @since 11.0.0
 	 */
-	public function allowedApps() {
+	public function allowedApps(): array {
 		return ['deck'];
 	}
 }