Replace overload with casted return value

Author: AndrewFerr

src/embedded.ts

@@ -314,15 +314,7 @@ export class RoomWidgetClient extends MatrixClient {
         eventType: K,
         content: StateEvents[K],
         stateKey: string,
-    ): Promise<SendFutureResponse<F>>;
-    // eslint-disable-next-line
-    public async _unstable_sendStateFuture<K extends keyof StateEvents>(
-        roomId: string,
-        futureOpts: SendFutureRequestOpts,
-        eventType: K,
-        content: StateEvents[K],
-        stateKey = "",
-    ): Promise<SendTimeoutFutureResponse | SendActionFutureResponse> {
+    ): Promise<SendFutureResponse<F>> {
         if (!(await this.doesServerSupportUnstableFeature(UNSTABLE_MSC4140_FUTURES))) {
             throw Error("Server does not support the Futures API");
         }
@@ -336,9 +328,9 @@ export class RoomWidgetClient extends MatrixClient {
             isTimeoutFuture ? futureOpts.future_timeout : undefined,
             "future_group_id" in futureOpts ? futureOpts.future_group_id : undefined,
         );
-        return isTimeoutFuture
+        return <SendFutureResponse<F>>(isTimeoutFuture
             ? this.validateSendTimeoutFutureResponse(response)
-            : this.validateSendActionFutureResponse(response);
+            : this.validateSendActionFutureResponse(response));
     }
 
     private validateSendEventResponse(response: ISendEventFromWidgetResponseData): ISendEventResponse {