diff --git a/src/matrix/storage/idb/Transaction.js b/src/matrix/storage/idb/Transaction.js
index 4c543f4c..d4949b02 100644
--- a/src/matrix/storage/idb/Transaction.js
+++ b/src/matrix/storage/idb/Transaction.js
@@ -17,7 +17,7 @@ limitations under the License.
 import {txnAsPromise} from "./utils";
 import {StorageError} from "../common";
 import {Store} from "./Store";
-import {SessionStore} from "./stores/SessionStore.js";
+import {SessionStore} from "./stores/SessionStore";
 import {RoomSummaryStore} from "./stores/RoomSummaryStore.js";
 import {InviteStore} from "./stores/InviteStore.js";
 import {TimelineEventStore} from "./stores/TimelineEventStore.js";
diff --git a/src/matrix/storage/idb/schema.js b/src/matrix/storage/idb/schema.js
index d593f6b9..fdfc78d7 100644
--- a/src/matrix/storage/idb/schema.js
+++ b/src/matrix/storage/idb/schema.js
@@ -1,7 +1,7 @@
 import {iterateCursor, reqAsPromise} from "./utils";
 import {RoomMember, EVENT_TYPE as MEMBER_EVENT_TYPE} from "../../room/members/RoomMember.js";
 import {RoomMemberStore} from "./stores/RoomMemberStore.js";
-import {SessionStore} from "./stores/SessionStore.js";
+import {SessionStore} from "./stores/SessionStore";
 import {encodeScopeTypeKey} from "./stores/OperationStore.js";
 
 // FUNCTIONS SHOULD ONLY BE APPENDED!!
diff --git a/src/matrix/storage/idb/stores/SessionStore.js b/src/matrix/storage/idb/stores/SessionStore.ts
similarity index 59%
rename from src/matrix/storage/idb/stores/SessionStore.js
rename to src/matrix/storage/idb/stores/SessionStore.ts
index 3be8e875..4da63649 100644
--- a/src/matrix/storage/idb/stores/SessionStore.js
+++ b/src/matrix/storage/idb/stores/SessionStore.ts
@@ -13,28 +13,31 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */
+import {Store} from "../Store"
 
 export class SessionStore {
-	constructor(sessionStore) {
-		this._sessionStore = sessionStore;
-	}
+    private _sessionStore: Store<any>
 
-	async get(key) {
-		const entry = await this._sessionStore.get(key);
-		if (entry) {
-			return entry.value;
-		}
-	}
+    constructor(sessionStore: Store<any>) {
+        this._sessionStore = sessionStore;
+    }
 
-	set(key, value) {
-		this._sessionStore.put({key, value});
-	}
+    async get(key: IDBValidKey) {
+        const entry = await this._sessionStore.get(key);
+        if (entry) {
+            return entry.value;
+        }
+    }
 
-    add(key, value) {
+    set(key: IDBValidKey, value: any) {
+        this._sessionStore.put({key, value});
+    }
+
+    add(key: IDBValidKey, value: any) {
         this._sessionStore.add({key, value});
     }
 
-    remove(key) {
+    remove(key: IDBValidKey) {
         this._sessionStore.delete(key);
     }
 }