these don't return a promise anymore

src/matrix/storage/idb/stores/PendingEventStore.js

@@ -58,11 +58,11 @@ export class PendingEventStore {
     
     add(pendingEvent) {
         pendingEvent.key = encodeKey(pendingEvent.roomId, pendingEvent.queueIndex);
-        return this._eventStore.add(pendingEvent);
+        this._eventStore.add(pendingEvent);
     }
 
     update(pendingEvent) {
-        return this._eventStore.put(pendingEvent);
+        this._eventStore.put(pendingEvent);
     }
 
     getAll() {

src/matrix/storage/idb/stores/SessionStore.js

@@ -27,11 +27,11 @@ export class SessionStore {
 	}
 
 	set(key, value) {
-		return this._sessionStore.put({key, value});
+		this._sessionStore.put({key, value});
 	}
 
     add(key, value) {
-        return this._sessionStore.add({key, value});
+        this._sessionStore.add({key, value});
     }
 
     remove(key) {

src/matrix/storage/idb/stores/TimelineEventStore.js

@@ -238,7 +238,7 @@ export class TimelineEventStore {
         entry.key = encodeKey(entry.roomId, entry.fragmentId, entry.eventIndex);
         entry.eventIdKey = encodeEventIdKey(entry.roomId, entry.event.event_id);
         // TODO: map error? or in idb/store?
-        return this._timelineStore.add(entry);
+        this._timelineStore.add(entry);
     }
 
     /** Updates the entry into the store with the given [roomId, eventKey] combination.
@@ -247,7 +247,7 @@ export class TimelineEventStore {
      *  @return {Promise<>} a promise resolving to undefined if the operation was successful, or a StorageError if not.
      */
     update(entry) {
-        return this._timelineStore.put(entry);
+        this._timelineStore.put(entry);
     }
 
     get(roomId, eventKey) {

src/matrix/storage/idb/stores/TimelineFragmentStore.js

@@ -62,11 +62,11 @@ export class TimelineFragmentStore {
     // like give them meaning depending on range. not for now probably ...
     add(fragment) {
         fragment.key = encodeKey(fragment.roomId, fragment.id);
-        return this._store.add(fragment);
+        this._store.add(fragment);
     }
 
     update(fragment) {
-        return this._store.put(fragment);
+        this._store.put(fragment);
     }
 
     get(roomId, fragmentId) {