report unsupported error when the feature is not available

Author: YoEight

packages/db-client/src/streams/appendToStream/index.ts

@@ -1,5 +1,5 @@
 import { StreamsService } from "../../../generated/streams_grpc_pb";
-
+import { StreamsServiceService} from "../../../generated/streams.v2_grpc_pb";
 import { Client } from "../../Client";
 import { ANY } from "../../constants";
 import type {
@@ -11,6 +11,7 @@ import type {
   MultiAppendResult,
   AppendStreamRequest,
 } from "../../types";
+import { UnsupportedError } from "../../utils";
 
 import { append } from "./append";
 import { batchAppend } from "./batchAppend";
@@ -87,5 +88,9 @@ Client.prototype.multiAppend = async function (
   requests: AppendStreamRequest[],
   baseOptions: BaseOptions = {}
 ): Promise<MultiAppendResult> {
+
+  if (!(await this.supports(StreamsServiceService.multiStreamAppendSession, "all"))) {
+    throw new UnsupportedError("multiStreamAppend", "25.10");
+  }
   return multiAppend.call(this, requests, baseOptions);
 };

packages/db-client/src/streams/appendToStream/multi.ts

@@ -22,6 +22,7 @@ export const multiAppend = async function (
     "multiStreamAppend",
     (client) =>
       new Promise<MultiAppendResult>(async (resolve, reject) => {
+        baseOptions.requiresLeader = false;
         const sink = client.multiStreamAppendSession(
           ...this.callArguments(baseOptions),
           (error, response) => {