fix observable typescript errors

src/domain/SessionPickerViewModel.js

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import {SortedArray} from "../observable/index.js";
+import {SortedArray} from "../observable/index";
 import {ViewModel} from "./ViewModel";
 import {avatarInitials, getIdentifierColorNumber} from "./avatar";
 

src/matrix/Session.js

@@ -21,7 +21,7 @@ import {RoomStatus} from "./room/common";
 import {RoomBeingCreated} from "./room/RoomBeingCreated";
 import {Invite} from "./room/Invite.js";
 import {Pusher} from "./push/Pusher";
-import { ObservableMap } from "../observable/index.js";
+import { ObservableMap } from "../observable/index";
 import {User} from "./User.js";
 import {DeviceMessageHandler} from "./DeviceMessageHandler.js";
 import {Account as E2EEAccount} from "./e2ee/Account.js";

src/matrix/room/timeline/Timeline.js

@@ -15,7 +15,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import {SortedArray, AsyncMappedList, ConcatList, ObservableArray} from "../../../observable/index.js";
+import {SortedArray, AsyncMappedList, ConcatList, ObservableArray} from "../../../observable/index";
 import {Disposables} from "../../../utils/Disposables";
 import {Direction} from "./Direction";
 import {TimelineReader} from "./persistence/TimelineReader.js";

src/observable/index.ts

@@ -46,3 +46,12 @@ Object.assign(BaseObservableMap.prototype, {
         return new JoinedMap([this].concat(otherMaps));
     }
 });
+
+declare module "./map/BaseObservableMap" {
+    interface BaseObservableMap<K, V> {
+        sortValues(comparator: (a: V, b: V) => number): SortedMapList<V>;
+        mapValues<M>(mapper: (V, emitSpontaneousUpdate: (params: any) => void) => M, updater: (mappedValue: M, params: any, value: V) => void): MappedMap<K, M>;
+        filterValues(filter: (V, K) => boolean): FilteredMap<K, V>;
+        join(...otherMaps: BaseObservableMap<K, V>[]): JoinedMap<K, V>;
+    }
+}