Remove a brittle cast from local member code

src/state/CallViewModel/CallViewModel.ts

@@ -504,25 +504,23 @@ export function createCallViewModel$(
     ),
   );
 
-  const localMatrixLivekitMemberUninitialized = {
+  const localMatrixLivekitMember$ = scope.behavior<MatrixLivekitMember | null>(
-    membership$: localRtcMembership$,
+    localRtcMembership$.pipe(
-    participant$: localMembership.participant$,
+      generateItems(
-    connection$: localMembership.connection$,
+        // Generate a local member when membership is non-null
-    userId: userId,
+        function* (membership) {
-  };
+          if (membership !== null) yield { keys: ["local"], data: membership };
-
+        },
-  const localMatrixLivekitMember$: Behavior<MatrixLivekitMember | null> =
+        (_scope, membership$) => ({
-    scope.behavior(
+          membership$,
-      localRtcMembership$.pipe(
+          participant$: localMembership.participant$,
-        switchMap((membership) => {
+          connection$: localMembership.connection$,
-          if (!membership) return of(null);
+          userId,
-          return of(
-            // casting is save here since we know that localRtcMembership$ is !== null since we reached this case.
-            localMatrixLivekitMemberUninitialized as MatrixLivekitMember,
-          );
         }),
       ),
-    );
+      map(([localMember]) => localMember ?? null),
+    ),
+  );
 
   // ------------------------------------------------------------------------
   // callLifecycle