fix more type things

web/src/components/events/EventItem.tsx

@@ -20,6 +20,7 @@ export const EventItem = ({
   size?: "small" | "medium" | "large";
 }) => {
   const nextOccurrence = getClosestOccurrence(event);
+  const numOccurrences = event?.occurrences?.length ?? 0;
 
   return (
     <li
@@ -42,9 +43,10 @@ export const EventItem = ({
         <h1 className={styles.title}>{event.title}</h1>
         {mode === "list" && nextOccurrence && (
           <p className={styles.details}>
-            {event.occurrences.length === 1 &&
+            {numOccurrences === 1 &&
+              nextOccurrence?.start &&
               formatDate(nextOccurrence.start, commonDateFormat)}
-            {event.occurrences.length > 1 && nextOccurrence && (
+            {numOccurrences > 1 && nextOccurrence?.start && (
               <span>
                 <em>Neste:</em>{" "}
                 {formatDate(nextOccurrence.start, commonDateFormat)}
@@ -52,11 +54,13 @@ export const EventItem = ({
             )}
           </p>
         )}
-        {mode === "calendar" && event.occurrence?.start && (
-          <p className={styles.details}>
-            {formatDate(event.occurrence?.start, "'kl.' HH:mm")}
-          </p>
-        )}
+        {mode === "calendar" &&
+          "occurrence" in event &&
+          event.occurrence?.start && (
+            <p className={styles.details}>
+              {formatDate(event.occurrence?.start, "'kl.' HH:mm")}
+            </p>
+          )}
       </div>
       <Link href={`/arrangementer/${event.slug}`} className="hiddenLink">
         Mer om arrangementet {event.title}